pH = 4.20
Explanation;pKa = -log(6.30 × 10^-5)
pKa = 4.20
Moles of Benzoic acid = volume × molarity
= 0.050L × 1.00M
= 0.050moles benzoic acid
Moles of the salt = 0.050L × 1.00M
= 0.050 moles salt
Therefore;
0.050mols / 0.1 L = 0.50M
0.050mols / 0.1 L = 0.50M
Thus;
pH = 4.20 + log(0.50/0.50)
pH = 4.20
From the calculations, the pH of the solution is 4.20
What is pH?The pH is defined as the degree of acidity or alkalinity of a solution. We have to find the pH of the buffer using the Henderson–Hasselbalch equation.
Since, Ka = 6.30 × 10^-5
then pKa = -log(6.30 × 10^-5)
pKa = 4.20
Number of moles of Benzoic acid = volume × molarity
= 0.050L × 1.00M = 0.050moles benzoic acid
Number of moles of benzoate = 0.050L × 1.00M = 0.050 moles
Total volume of solution = 50 mL + 50 mL = 100 mL or 0.1 L
Molarity of acid
0.050mols / 0.1 L = 0.50M
Molarity of conjugate base
0.050mols / 0.1 L = 0.50M
Hence;
pH = 4.20 + log(0.50/0.50)
pH = 4.20
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The coefficients of a balanced chemical equation indicate the relative number of
The coefficients of a balanced chemical equation indicate the relative number of moles of each chemical.
Which sabatamic particle is electrically neutral and found in the nucleus of an atom
The neutron. It is neutral and found inside the nucleus with positive protons.
URGENT!!!
Calculate how many grams of Zinc Chloride are produced if 6.5 of Zn is used to react in the chemical reaction below. Be sure to show all of your work.
Zn + 2HCl —> ZnCl2 + H2
= 13.629 g of ZnCl2
Explanation;The equation for the reaction.
Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g)
Number of moles of Zinc;
Moles = mass/RAM
= 6.5 g/65g/mol
= 0.1 moles
The mole ration of Zn : ZnCl2 is 1 : 1
Therefore, number of moles of ZnCl2 is 0.1 moles
Mass = moles × Molar mass
= 0.1 ×136.286 g/mol
= 13.629 g
Using the balanced equation Zn + 2HCl —> ZnCl₂ + H₂, we find that 6.5 g of Zinc produces 13.55 grams of Zinc Chloride.
First, let's write the balanced equation:
Zn + 2HCl → ZnCl₂ + H₂The molar mass of Zn is 65.38 g/mol.The number of moles of Zn is:
n(Zn) = 6.5 g / 65.38 g/mol = 0.099 molFrom the balanced equation, we know that 1 mole of Zn reacts to form 1 mole of ZnCl₂. Therefore, the number of moles of ZnCl₂ produced is:
n(ZnCl₂) = 0.099 mol (Zn) × (1 mol ZnCl₂ / 1 mol Zn) = 0.099 molThe molar mass of ZnCl₂ is 136.29 g/mol.Now, let's calculate the mass of ZnCl₂ produced:
m(ZnCl₂) = 0.099 mol × 136.29 g/mol = 13.5 gTherefore, if 6.5 g of Zn is used, the mass of ZnCl₂ produced is 13.55 g.
A solution at 25 degrees Celsius is 1.0 × 10–5 M H3O+. What is the concentration of OH– in this solution?
Answer:
[OH⁻] = 1.0 x 10⁻⁹ M.
Explanation:
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/(1.0 x 10⁻⁵) = 1.0 x 10⁻⁹ M.
Consider the reaction: so2cl2(g)⇌so2(g)+cl2(g) kp=2.91×103 at 298 k in a reaction at equilibrium, the partial pressure of so2 is 0.156 atm and that of cl2 is 0.370 atm . part a what is the partial pressure of so2cl2 in this mixture?
Answer:
1.98 x 10⁻⁵ atm.
Explanation:
For the reaction: SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g), Kp = 2.91 x 10³.∵ Kp = (PSO₂)(PCl₂)/(PSO₂Cl₂).
PSO₂ = 0.156 atm, PCl₂ = 0.370 atm.
∴ 2.91 x 10³ = (0.156 atm)(0.370 atm)/(PSO₂Cl₂)
∴ (PSO₂Cl₂) = (0.156 atm)(0.370 atm)/(2.91 x 10³) = 1.98 x 10⁻⁵ atm.
The partial pressure of [tex]SO_2Cl_2[/tex] in the given mixture is approximately 0.00199 atm.
The equilibrium constant (Kp) expression and the partial pressures of [tex]SO_2[/tex] and [tex]Cl_2[/tex] can be used to calculate the partial pressure of [tex]SO_2Cl_2[/tex] in a given combination.
The equilibrium constant expression for the reaction is:
[tex]Kp = (P(SO_2) * P(Cl_2)) / P(SO_2Cl_2)[/tex]
We are given:
Kp = [tex]2.91 * 10^3[/tex]
[tex]P(SO_2)[/tex] = 0.156 atm
[tex]P(Cl_2)[/tex]= 0.370 atm
substituting the vales into the equilibrium constant expression and solve for [tex]P(SO_2Cl_2)[/tex]:
[tex]2.91 * 10^3 = (0.156 * 0.370) / P(SO2Cl2)\\2.91 * 10^3 * P(SO_2Cl_2) = 0.156 * 0.370\\P(SO_2Cl_2) = (0.156 * 0.370) / (2.91 * 10^3)[/tex]
[tex]P(SO_2Cl_2) = 0.00199 atm[/tex]
Hence, the partial pressure of [tex]SO_2Cl_2[/tex] in the given mixture is approximately 0.00199 atm.
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HURRY>>> PLEASE. Which statements best describe wavelengths of sunlight that are longer than 700 nanometers? Check all that apply.
A.These wavelengths are longer than the wavelengths of visible light.
B.These wavelengths form the infrared part of the spectrum.
C.These wavelengths form the ultraviolet light of the spectrum.
D.These wavelengths are shorter than the wavelengths of visible light.
E.These wavelengths are part of the visible light spectrum.
Answer:
These wavelengths are longer than wavelength of visible light.
These wavelengths form the infra-red part of the spectrum.
Explanation:
Solar spectrum lies in three parts of the electromagnetic spectrum, that is; Ultraviolet, visible and infra-red. Visible light lies from 400 nm to 700 nm.Ultraviolet region precedes visible spectrum and has shorter wavelength than it. Beyond visible spectrum, infrared part of the spectrum starts and has longer wavelength than it.The wavelength of sunlight that are greater than 700 nm wavelength have longer wavelength than visible light and lie in the infra-red part of the spectrum.Answer:
its d,b,e
Explanation:
Solar power would be most successful as an energy source in
a. Southern California and Australia.
b. Nova Scotia.
c. Wisconsin, Iowa, Minnesota and Ohio.
d. the Pacific Northwest.
Answer:
The correct answer is: a. Southern California and Australia.
Explanation:
The solar power, in order to be more efficient and more productive, needs to be produced in places that have a lot of sunny days throughout the year. So the wisest and most practical thing to do is to install solar panels at places that are warm and sunny for most of the year. The southern part of California and most of Australia would be excellent choices for something like this. Both places have predominantly warm weather throughout the year, and more important, they have a lot of sunny days throughout the year. That provides the perfect conditions for harvesting the solar energy and use it as an energy source.
Answer:
a
Explanation:
After electrolyzing aqueous zinc iodide (ZnI2), what state is iodine in - solid, liquid, or gas?
After electrolysing ZnI2, iodine crystals are formed, therefore, the answer is solid.
A classmate of yours is allergic to bees and thinks it would be fine if bees went extinct but you believe bees are an important part of our ecosystem. What would you say in response to their statement? Support your response with details about biodiversity, food webs, and what would happen if they were to go extinct. (must be at least 5 sentences)
I would say that bees play a vital role in our ecosystem because they produce honey which many animals on the food web eat. Though they are on the lower end of the food web it would still cause many problems because they pollinate flowers. If they did not do that anymore there would be problems with the flowers,etc. Biodiversity is another problem because without them there won’t be as much diversity in our ecosystem and some organisms might die out.
Final answer:
Bees are key pollinators vital for plant reproduction and food production. Their loss would significantly disrupt food webs and could lead to the collapse of ecosystems. The uncertainty of other pollinators filling their role makes bee conservation critical.
Explanation:
Bees play a crucial role in our ecosystems and their extinction would have dramatic consequences for biodiversity, food webs, and the global food supply. Bees are key pollinators, facilitating the reproduction of many flowering plants. The mutualistic relationship between bees and plants is essential for the production of fruits, vegetables, and nuts.
Pesticides, which have been known to kill bees, disrupt this balance and can lead to reduced food yields. The ecological importance of bees extends to their contribution to biodiversity, which is vital for the stability and health of ecosystems. If bees were to go extinct, not only would food production be jeopardized, but entire ecosystems could collapse, affecting all species within them, including humans.
Moreover, bees are part of complex food webs, and their loss would trigger a domino effect, potentially causing the extinction of other species. While some may posit that other pollinators would replace bees, the unique role bees play makes it uncertain that other species could fully compensate for their absence, particularly in the case of certain crops.
Explain why groups 14 and 15 are better representatives of mixed groups than groups 13 and 16
Groups 14 and 15 each contain metals, nonmetals, and metalloids while Group 13 contains metals and a metalloid, and Group 16 contains metalloids and nonmetals.
Explanation;Groups 13–16 of the periodic table contain one or more metalloids, in addition to metals, nonmetals, or both.Unlike other groups of the periodic table, which contain elements in one class, groups 13–16 referred to as mixed groups contain elements in at least two different classes. In addition to metalloids, they also contain metals, nonmetals, or both.Group 14 also known as the carbon group contains carbon which is a non metal, silicon and germanium which are metalloids and tin and lead which are metals.Group 15 also known as the Nitrogen group contains non metals such as oxygen, metalloid tellurium and a metal polonium.Groups 14 and 15 should comprise of metals, nonmetals, and metalloids while on the other hand Group 13 comprise metals and a metalloid, and Group 16 comprise metalloids and nonmetals.
Why group 14 and 15 are better than groups 13 and 16?Groups 13–16 of the periodic table comprise of one or more metalloids. It refers to the mixed groups comprise of elements in at minimum two different classes. Group 14 also called as the carbon group comprise carbon which is a nonmetal, silicon, and germanium. Group 15 also called as the Nitrogen group comprise non metals like oxygen.
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A 0.500 L bottle of water contains 8.82 × 10–7 mL of benzene. What is the concentration of benzene in ppmv?
0.00176 ppmv
This is the answer for ed
Answer:
the answer is 0.00176 ppmv
Explanation:
trust me bro, im asian
What are the chemical formulas for..
Heptasulfur Pentoxide:
Trisulfur Monochloride:
Selenium Hexafluoride:
Tetranitrogen Pentasulfide:
Carbon Nonachloride:
???
The chemical formulas are: Heptasulfur Pentoxide: S7O5, Trisulfur Monochloride: S3Cl, Selenium Hexafluoride: SeF6, Tetranitrogen Pentasulfide: N4S5, Carbon Nonachloride: C9Cl8
Explanation:1. Heptasulfur Pentoxide (S7O5): This compound consists of seven sulfur (S) atoms and five oxygen (O) atoms, forming a molecular structure with a total of twelve atoms.
2. Trisulfur Monochloride (S3Cl): This compound is composed of three sulfur (S) atoms and one chlorine (Cl) atom, combining to create a molecule with a total of four atoms.
3. Selenium Hexafluoride (SeF6): Selenium (Se) forms a compound with six fluorine (F) atoms, resulting in a molecule containing a total of seven atoms.
4. Tetranitrogen Pentasulfide (N4S5): This compound includes four nitrogen (N) atoms and five sulfur (S) atoms, making it a molecular structure with a total of nine atoms.
5. Carbon Nonachloride (C9Cl8): This compound comprises nine carbon (C) atoms and eight chlorine (Cl) atoms, forming a molecule with a total of seventeen atoms.
These chemical formulas provide information about the types and quantities of atoms in each compound, and they play a crucial role in understanding the chemical properties and behavior of these substances.
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Process A: A + B --> C dG = 101.3 kJ/mol
Process B: D --> C + E dG = -101.3 kJ/mol
If you were tasked with the production of compound C for a pharmaceutical company, which process would you use for it's production based on the data provided and why?
a
Process A, because it releases more energy.
b
Process A, because it is a spontaneous process.
c
Process B, because it releases more energy.
d
Process B, because it is a spontaneous process.
D. Process B, because it is a spontaneous process.
Explanation;A spontaneous process is one that will occur without any energy input from the surroundings.A spontaneous reaction may involve an increase or decrease in enthalpy, it may involve an increase or decrease in entropy, but it will always involve a decrease in free energy that is a negative ΔG.Therefore; process B is spontaneous since it has a negative ΔGThe doctor knows that people taking the medicine may sleep better just because they expect the medicine to work. How can he be sure of whether the medicine really works?
The best test would be doing a double-blind test between the person who is receiving the medicine so that they don't know if they received a placebo or not and the person giving the medicine does not know if the participant is receiving a placebo or not.
However, a placebo test can simply be done. This is where the patient received a medicine that does not have any medicinal effects and see if the person sleeps better. If they say they did, they have fallen under the placebo effect.
29) The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _______ solution, and a pH near 14 indicates a(n) _______ solution. A) acidic; basic B) basic; acidic C) neutral; basic D) acidic; neutral
The correct answer is: A) acidic, basic.
Predict the ground-state electron configuration of the following ions. Write your answers in abbreviated form, that is, beginning with a noble gas in brackets.a). Cr2+b.)Cu2+c.)Co3+
These are three questions and three complete answers
Answer:
a) Cr²⁺: [Ar] 4s² 3d²
b) Cu²⁺: [Ar] 4s² 3d⁷
c) Co³⁺: [Ar] 4s² 3d⁴
Explanation:
a) Cr²⁺
Z = 24Number of protons: 24Number of elecrons of the neutral atom: 24Charge of the ions: + 2Number of electrons of the ion: 24 - charge = 24 - 2 = 22.Electron configuration:Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....
Hence, for 22 electrons you get:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²
Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:
[Ar] 4s² 3d²
b) Cu²⁺
Z = 29Number of protons: 29Number of elecrons of the neutral atom: 29Charge of the ion: + 2Number of electrons of the ion: 29 - charge = 29 - 2 = 27.Electron configuration:Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....
Hence, for 27 electrons you get:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:
[Ar] 4s² 3d⁷
c) Co³⁺
Z = 27Number of protons: 27Number of elecrons of the neutral atom: 27Charge of the ion: + 3Number of electrons of the ion: 27 - charge = 27 - 3 = 24.Electron configuration:Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....
Hence, for 24 electrons you get:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴
Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:
[Ar] 4s² 3d⁴
The compound sb4o5cl2(s), which has been investigated because of its interesting electrical properties, can be prepared by warming a mixture of antimony(iii) oxide and antimony(iii) chloride, both of which are solids. What is the coefficient of antimony(iii) oxide in the balanced equation for the reaction?
5Sb2O3 + 2SbCl3 -> 3Sb4O5Cl2
The coefficient of Sb2O3 in the equation is 5.
Final answer:
The coefficient of antimony(III) oxide in the balanced chemical equation for the reaction to produce Sb4O5Cl2(s) is 4.
Explanation:
The student is asking for the coefficient of antimony(III) oxide in the balanced chemical equation for the reaction to produce Sb4O5Cl2(s). This substance can be prepared by reacting antimony(III) oxide (Sb2O3) with antimony(III) chloride (SbCl3).
To find the coefficient, we need to balance the equation. Let's consider 'a' as the coefficient for Sb2O3 and 'b' for SbCl3. The possible reaction would be:
a Sb2O3(s) + b SbCl3(s) → Sb4O5Cl2(s)
By examining the stoichiometry, we find that for every 4 atoms of antimony, we should have 5 oxygen and 2 chlorine atoms on the reactant side as well. After balancing, we get:
4 Sb2O3(s) + 2 SbCl3(s) → Sb4O5Cl2(s)
Therefore, the coefficient of antimony(III) oxide is 4.
how many of the following elements have 2 unpaired electrons in the ground state? C, O, Ti, Si a) 1 b) 3 c) 4 d) 2
Answer: Option (c) is the correct answer.
Explanation:
Atomic number of carbon is 6 and its electronic configuration is [tex]1s^{2}2s^{2}2p^{2}[/tex].
Atomic number of oxygen is 8 and its electronic configuration is [tex]1s^{2}2s^{2}2p^{4}[/tex].
Atomic number of titanium is 2 and its electronic configuration is [tex][Ar]4s^{2}3d^{2}[/tex].
Atomic number of silicon is 14 and its electronic configuration is [tex][Ne]3s^{2}3p^{2}[/tex].
Therefore, we can conclude that out of the given options all the 4 elements have 2 unpaired electrons in the ground state.
Among Carbon (C), Oxygen (O), Titanium (Ti), and Silicon (Si), only Carbon (C) and Silicon (Si) have 2 unpaired electrons in their ground state.
Explanation:The question is asking how many of the following elements: Carbon (C), Oxygen (O), Titanium (Ti), and Silicon (Si) have 2 unpaired electrons in the
ground state
. In a
ground state
, an atom's electrons are all in the lowest possible energy levels. Carbon has 2 unpaired electrons, as its electron configuration ends in 2s^22p^2. Silicon, similar to carbon, also has 2 unpaired electrons with electron configuration ending in 3s^23p^2. However, Oxygen (2s^22p^4) and Titanium (3d^24s^2) do not have 2 unpaired electrons in their ground state, the answer is therefore (d) 2.
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Can someone explain this to me?
Other than to say that I see why you are having trouble, I think you could use either.
Having said that, the blue is far more pronounced going from 7 to 9. Seven is more of a dirty blue at 7. It is sky blue at 9. I would pick that.
When you look up it's pH it is given as 7.6 which is about as slightly basic as you can get. At that point it starts to turn blue.
Methyl Red is really weird stuff.
It is red under pH = 4.4 which definitely acidic and yellow above 6.2. It is orange in between.
I would still go with Bromothymol blue, but I'm betting that either could be used.
I hope this is a discussion question, because if you want my honest opinion, it's too close to call.
Answer:
Bromthymol Blue
Step-by-step explanation:
You want to choose an indicator that changes colour at the right pH.
In this case, let's say slightly basic means pH ≈ 8.
Methyl Red
From the pictures, it looks like pH 6 and pH 8 would have similar colours, and it would be difficult to distinguish them. The solution could be slightly acidic or slightly basic.
Bromthymol Blue
A solution with pH 8 would have a definite blue-green colour, which indicates that the solution is basic with no ambiguity.
I vote for Bromthymol Blue.
In a certain acidic solution at 25 ∘c, [h+] is 100 times greater than [oh −]. what is the value for [oh −] for the solution? in a certain acidic solution at 25 , [] is 100 times greater than [ ]. what is the value for [ ] for the solution? 1.0×10−8 m 1.0×10−7 m 1.0×10−6 m 1.0×10−2 m 1.0×10−9 m
Answer:
1.0 x 10⁻⁸ M.
Explanation:
∵ [H⁺][OH⁻] = 10⁻¹⁴.
∵ [H⁺] = 100 [OH⁻].
∴ 100 [OH⁻][OH⁻] = 10⁻¹⁴.
∴ 100 [OH⁻]² = 10⁻¹⁴.
[OH⁻]² = 10⁻¹⁴/ 100 = 1.0 x 10⁻¹⁶.
∴ [OH⁻] = √(1.0 x 10⁻¹⁶) = 1.0 x 10⁻⁸ M.
Given the data from the question, the value of the concentration of the hydroxide ion OH¯ is 1×10¯⁸ M
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion, H⁺ concentration while the pOH measures the hydroxide ion, OH¯ concentration
Relationships between H⁺ and OH¯[H⁺] × [OH¯] = 10¯¹⁴
How to determine OH¯From the question given above, the following data were obtained:
Hydrogen ion concentration [H⁺] = 100[OH¯]Hydroxide ion concentration [OH¯] =?[H⁺] × [OH¯] = 10¯¹⁴
100[OH¯] × [OH¯] = 10¯¹⁴
100 × [OH¯]² = 10¯¹⁴
Divide both side by 100
[OH¯]² = 10¯¹⁴ / 100
[OH¯]² = 10¯¹⁶
Take the square root of both side
[OH¯] = √(10¯¹⁶)
[OH¯] = 1×10¯⁸ M
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Provide an iupac name for the structure shown.
Answer:
3 methylheptane
Explanation:
just toke the test
Gerontology is the scientific study of aging involving various disciplines. It encompasses the understanding of primary and secondary aging phenomena. Specialized fields such as Social Gerontology and Thanatology are also part of this study.
Explanation:The scientific study of the process and phenomena of aging is called Gerontology. Gerontology is a multidisciplinary field, involving medical and biological scientists, social scientists, and economic scholars. It probes the process of aging and the complications faced as individuals grow older.
As aging affects every aspect of human life, biological, social, and psychological, gerontologists aim to understand what it is like to be an older adult in society. The study includes two types of aging- primary aging, which involves inherent biological factors such as molecular and cellular changes, and secondary aging, which is influenced by controllable factors like exercise and diet.
Gerontology also encompasses the specialized field of Social Gerontology, examining the sociological aspects of aging, and Thanatology, the systematic study of death and dying. Scholars in this field also focus on the impact of societal attitudes and beliefs about the aging process.
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[Standard Enthalpy of Formation]
Remember to show work and explain.
3. From this data, calculate the change in enthalpy for:
4. Use the information below to solve for the ∆H for the reaction:
Answer:
3. ΔH = 0.30 kJ; 4. ΔH = -84.6 kJ
Step-by-step explanation:
Question 3:
We have three equations:
(I) S(r) + O₂ → SO₂; ΔH = -296.06 kJ
(II) S(m) + O₂ ⟶ SO₂; ΔH = -296.36 kJ
From these, we must devise the target equation:
(III) S(r) ⟶ S(m); ΔH = ?
The target equation has 1S(r) on the left, so you rewrite Equation(I).
(IV) S(r) + O₂ ⟶ SO₂; ΔH = -296.06 kJ
Equation (IV) has 1SO₂ on the right, and that is not in the target equation.
You need an equation with 1SO₂ on the left, so you reverse Equation (II).
When you reverse an equation, you change the sign of its ΔH.
(V) SO₂ ⟶ S(m) + O₂ ; ΔH = 296.36 kJ
Now, you add equations (IV) and (V), cancelling species that appear on opposite sides of the reaction arrows.
When you add equations, you add their ΔH values.
We get the target equation (III)
(IV) S(r) + O₂ ⟶ SO₂; ΔH = -296.06 kJ
(V) SO₂ ⟶ S(m) + O₂; ΔH = 296.36 kJ
(III) S(r) ⟶ S(m); ΔH = 0.30 kJ
Question 4
We have three equations:
(I) C + O₂ ⟶ CO₂; ΔH = -393.5 kJ
(II) H₂ + ½O₂ ⟶ H₂O; ΔH = -285.8 kJ
(III) 2C₂H₆ + 7O₂ ⟶ 4CO₂ + 6H₂O; ΔH = -296.8 kJ
From these, we must devise the target equation:
(IV) 2C + 3H₂ → C₂H₆; ΔH = ?
The target equation has 2C on the left, so you double Equation(I).
When you double an equation, you double its ΔH.
(V) 2C + 2O₂ ⟶ 2CO₂; ΔH = -787.0 kJ
Equation (V) has 2CO₂ on the right, and that is not in the target equation.
You need an equation with 2CO₂ on the left, so you reverse Equation (III) and divide it by 2.
(VI) 2CO₂ + 3H₂O ⟶ C₂H₆ + ⁷/₂O₂; ΔH = 148.4 kJ
Equation (V) has 3H₂O on the left, and that is not in the target equation.
You need an equation with 3H₂O on the right. Triple Equation (III).
(VII) 3H₂ + ³/₂O₂ ⟶ 3H₂O; ΔH = -857.4 kJ
Now, you add equations (V), (VI), and (VII), cancelling species that appear on opposite sides of the reaction arrows.
We get the target equation (IV).
(V) 2C + 2O₂ ⟶ 2CO₂; ΔH = -787.0 kJ
(VI) 2CO₂ + 3H₂O ⟶ C₂H₆ + ⁷/₂O₂; ΔH = 1559.8 kJ
(VII) 3H₂ + ³/₂O₂ ⟶ 3H₂O; ΔH = - 857.4 kJ
(IV) 2C + 3H₂ → C₂H₆; ΔH = -84.6 kJ
The highest sustained pressure achieved in the laboratory is 1.5 × 107 kilopascals, kpa. what is this pressure in atm, mmhg, and torr?
Answer:
1.5 × 10⁷ kPa = 148038.5 atm = 1.12 x 10⁸ mmHg = 1.12 x 10⁸ torr.
Explanation:
To convert from kPa to atm:Knowing that:
1 atm = 101.325 kPa.
??? atm = 1.5 × 10⁷ kPa.
Using cross multiplication:
∴ 1.5 × 10⁷ kPa = (1 atm)(1.5 × 10⁷ kPa)/(101.325 kPa) = 148038.5 atm,
To convert from kPa to mmHg:Knowing that:
1.0 kPa = 7.5 mmHg.
1.5 × 10⁷ kPa = ??? mmHg.
Using cross multiplication:
∴ 1.5 × 10⁷ kPa = (7.5 mmHg)(1.5 × 10⁷ kPa)/(1.0 kPa) = 1.12 x 10⁸ mmHg.
To convert from kPa to torr:Knowing that:
1.0 kPa = 7.5 torr.
1.5 × 10⁷ kPa = ??? torr.
Using cross multiplication:
∴ 1.5 × 10⁷ kPa = (7.5 torr)(1.5 × 10⁷ kPa)/(1.0 kPa) = 1.12 x 10⁸ torr.
The pressure of 1.5 × 10⁷ kPa is approximately 148026.77 atm, 112536909.77 mmHg, and 112536909.77 torr.
Explanation:The highest sustained pressure in the laboratory given is 1.5 × 10⁷ kilopascals (kpa). To convert this pressure into different units, we need to use some conversion rates. The conversions rates we need are: 1 atm = 101.325 kPa, 1 mmHg = 0.133322 kPa, and 1 torr = 0.133322 kPa (as 1 torr is equivalent to 1 mmHg).
First, to convert the pressure to atm: (1.5 × 107 kPa) / 101.325 kPa/atm = approx. 148026.77 atmNext, to convert the pressure to mmHg: (1.5 × 107 kPa) / 0.133322 kPa/mmHg = approx. 112536909.77 mmHgLastly, to convert the pressure to torr: (1.5 × 107 kPa) / 0.133322 kPa/torr = approx. 112536909.77 torr (since torr and mmHg are equivalent units).Learn more about Pressure Conversion here:https://brainly.com/question/13969823
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Given: 2H2O2 → 2H2O + O2 structure of H2O2: H–O–O–H Bond Bond Energy (kJ/mol) O–H 459 O=O 494 O–O 142 Based on the given bond energies, what is the enthalpy change for the chemical reaction? A. -352 kJ B. -210 kJ C. -176 kJ D. -105 kJ
Answer:
B. - 210 kJ
Explanation:
∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.
The bond formation in the products releases energy (exothermic).The bond breaking in the reactants requires energy (endothermic).The products:
H₂O contains 2 O-H (- 459 kJ/mol) bonds.O₂ contain 1 O=O (- 494 kJ/mol) bond.The reactants:
H₂O₂ contain 2 O–H (459 kJ/mol) bonds and 1 O–O (142 kJ/mol) bond.∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.
∴ ΔHrxn = [2 (2 x (O–H bond energy) + (1 x (O=O bond energy)] - 2 [(2 x (O–H bond energy) + (1 x (O–O bond energy)] = [2 (2 x - 459 kJ/mol) + (1 x - 494 kJ/mol)] - 2 [(2 x 459 kJ/mol) + (1 x 142 kJ/mol)] = (- 2330 kJ) + (2120 kJ) = - 210 kJ.
Answer:
B. - 210 kJ
Explanation:
∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.
The bond formation in the products releases energy (exothermic).
The bond breaking in the reactants requires energy (endothermic).
The products:
H₂O contains 2 O-H (- 459 kJ/mol) bonds.
O₂ contain 1 O=O (- 494 kJ/mol) bond.
The reactants:
H₂O₂ contain 2 O–H (459 kJ/mol) bonds and 1 O–O (142 kJ/mol) bond.
∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.
∴ ΔHrxn = [2 (2 x (O–H bond energy) + (1 x (O=O bond energy)] - 2 [(2 x (O–H bond energy) + (1 x (O–O bond energy)] = [2 (2 x - 459 kJ/mol) + (1 x - 494 kJ/mol)] - 2 [(2 x 459 kJ/mol) + (1 x 142 kJ/mol)] = (- 2330 kJ) + (2120 kJ) = - 210 kJ.
The following statements concern the relationship between mitochondrial hydrogen ion concentration and energy storage as atp during oxidative phosphorylation. Classify each statement as either accurate or inaccurate.Accurate InaccurateStatementsHydrogen ions cannot freely pass through the inner mitachondrial membraneOxidative phosphorylation relies on the H H+ concentration is lower in the mitochondrial gradient generated by the electron transport chain matrix than in the intermembrane spaceEnergy is generated as a result of the difference in hydrogen ion concentration betweenThe pH in the intermembrane space is higher the mitochondrial matrix and the cytoplasm than the pH in the mitochondrial matrix ATP synthase uses energy from ATP to move H into the mitochondrial matrix
The classification of the statements reveals accurate understanding of hydrogen ion movement during oxidative phosphorylation, with misinterpretations concerning the ATP synthase function and the role of the cytoplasm in energy generation.
Explanation:Let's classify the given statements about the relationship between mitochondrial hydrogen ion concentration and energy storage as ATP during oxidative phosphorylation as either accurate or inaccurate.
Hydrogen ions cannot freely pass through the inner mitochondrial membrane is accurate. The inner mitochondrial membrane is impermeable to these ions and they have to be transported through specific transport systems.Oxidative phosphorylation relies on the H+ concentration gradient generated by the electron transport chain is accurate. The electron transport chain creates an electrochemical gradient (proton motive force) which is used to generate ATP.H+ concentration is lower in the mitochondrial matrix than in the intermembrane space is accurate. This is due to the active transport of H+ ions from the matrix to the intermembrane space during electron transport.Energy is generated as a result of the difference in hydrogen ion concentration between the mitochondrial matrix and the cytoplasm is inaccurate. The energy is actually generated by the difference in hydrogen concentration between the mitochondrial matrix and the intermembrane space, not the cytoplasm.The pH in the intermembrane space is higher than the pH in the mitochondrial matrix is inaccurate. The intermembrane space is more acidic (thus, lower pH) due to the accumulation of H+ ions.ATP synthase uses energy from ATP to move H+ into the mitochondrial matrix is inaccurate. ATP synthase actually uses the energy from the movement of H+ down its concentration gradient to generate ATP. Learn more about Oxidative Phosphorylation here:https://brainly.com/question/29104695
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The accurate statements are that hydrogen ions cannot freely pass through the inner mitochondrial membrane, the oxidative phosphorylation process relies on the H+ gradient, and the H+ concentration is lower in the matrix than the intermembrane space. Incorrect statements include the site of energy generation and the role of ATP synthase.
The student's question pertains to the relationship between mitochondrial hydrogen ion concentration and ATP synthesis during oxidative phosphorylation. Statements must be classified based on their accuracy concerning this biochemical process.
Hydrogen ions cannot freely pass through the inner mitochondrial membrane: Accurate.Oxidative phosphorylation relies on the H+ concentration gradient generated by the electron transport chain: Accurate.H+ concentration is lower in the mitochondrial matrix than in the intermembrane space: Accurate.Energy is generated as a result of the difference in hydrogen ion concentration between the mitochondrial matrix and the cytoplasm: Inaccurate (it's between the matrix and the intermembrane space, not the cytoplasm).The pH in the intermembrane space is lower (more acidic) than the pH in the mitochondrial matrix: Accurate.ATP synthase uses energy from ATP to move H+ into the mitochondrial matrix: Inaccurate (ATP synthase uses the energy from the proton gradient to synthesize ATP from ADP and Pi).PLEASE HELP!!!!!
The pH of a solution is 3.40. What is the [H3O+] for the solution?
2.51 × 10−4 M
3.98 × 10−4 M
2.51 × 103 M
3.98 × 104 M
Answer:
3.98 x 10⁻⁴ M.
Explanation:
∵ pH = - log[H₃O⁺]
∴ 3.4 = - log[H₃O⁺].
∴ log[H₃O⁺] = - 3.4.
∴ [H₃O⁺] = 3.98 x 10⁻⁴ M.
Answer: The hydronium ion concentration for the solution is [tex]3.98\times 10^{-4}M[/tex]
Explanation:
pH is defined as the negative logarithm of hydrogen ion concentration or hydronium ion concentration present in a solution.
To calculate the pH of the reaction, we use the equation:
[tex]pH=-\log[H_3O^+][/tex]
We are given:
pH of the solution = 3.40
Putting values in above equation, we get:
[tex]3.40=-\log[H_3O^+][/tex]
[tex][H_3O^+]=3.98\times 10^{-4}M[/tex]
Hence, the hydronium ion concentration for the solution is [tex]3.98\times 10^{-4}M[/tex]
What is the basic unit of all matter? A. Neutron B. Atom C. Electron D. Proton E. Nucleus
An atom is the basic unit of all matter. The other answers are just pieces of an atom
Answer:
Atom
Explanation:
An atom is basic unit of all the matter.
Matter can be an element, which has only single kind of atom in it. It is pure form of matter. For example gold is an element and has single kind of atom with same atomic numbers.
Matter can be a compound, which has two or more kinds of atoms.
Example water.
Neutron, proton and electron are sub atomic particles. Electrons are present around a central unit of atom known as nucleus.
Nucleus contains protons and neutrons both.
Can you get carbon monoxide poisoning from a gas stove
It is possible yes, however it is more likely not to happen. Stoves do not produce CO unless it is in use, and then you could relatively only get carbon monoxide poisoning if you were in a confined space.
Yes, you can get carbon monoxide poisoning from a gas stove if it is not properly adjusted or ventilated. CO is an odorless, colorless gas that can cause serious health effects, and carbon monoxide detectors are essential for detecting its presence.
Carbon monoxide (CO) is a colorless, odorless gas that can cause serious health issues such as headaches, dizziness, nausea, and even death when inhaled in large amounts. In a household setting, CO levels without gas stoves range from 0.5 to 5 parts per million (ppm), but near a gas stove, especially one that is poorly adjusted, levels can be significantly higher.
Carbon monoxide is produced from the incomplete combustion of hydrocarbon fuels, a process that can occur with gas stoves if they are not properly ventilated. Inhaling high levels of CO can replace oxygen in the blood, leading to serious health consequences. Using carbon monoxide detectors in the home is crucial for safety, as they can alert residents to dangerous levels of CO and help prevent carbon monoxide poisoning.
A chemical reaction release 55.2 kcal. How many kilojoules does this correspond to?
Answer:
231.0 kJ
Explanation:
Chemical reactions releasing heat energy are exothermic reactions.
The chemical reaction released 55.2 kcal
1 kcal is equivalent to 4.184 kJ
Therefore 55.2 kcal is equivalent to - 4.184 kJ/kcal x 55.2 kcal
the energy in kJ is - 231.0 kJ
How do you do this problem?
C: incorrect. It caught you. There is only 1 molecule of C6H12O6 that you are given. That means there are 24 atoms in all for that glucose. Don't worry. I got caught as well. I was about to write a note saying that it should be the answer. It shouldn't.
A: has three atoms per molecule. There are 6.02 * 10^23 molecules - an incredibly large number which becomes 3 times its size when you ask about this in moles. Still A, large as it is , is not the answer.
B: H2O2 has 4 atoms per molecule. 4 mols have 4 * 6.02*10^23 atoms in a mol of H2O2. Read this sentence and A very carefully. There is 1 mol of CO2 which equals 3 * 6.02*10^23 atoms in 1 mol of CO2 which has 6.02 * 10^23 molecules per mole. Be sure you understand the difference.
B is the answer.
D and E are parts of a mol. They are bigger than C (much) but much smaller than A or B.
The molecular weight has nothing to do with your answer. Please read B and A until you understand them.