Answer:
Part A: 10.7.
Part B: 2) the solution is basic.
Part C: 5.9.
Part D: 1) the solution is acidic.
Part E: 8.1.
Part F: 2) the solution is basic.
Explanation:
Part A [OH−]= 4.5×10−4 M . Express your answer using two significant figures.
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
[OH⁻] = 4.5×10⁻⁴ M.
∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(4.5×10⁻⁴ M) = 2.22 × 10⁻¹¹ M.
∵ pH = - log[H₃O⁺]
∴ pH = - log(2.22 × 10⁻¹¹) = 10.65 ≅ 10.7.
Part B 1) the solution is acidic 2) the solution is basic 3) the solution is neutral
The solution is basic, because the pH is higher than 7.
Part C [OH⁻]= 7.7×10⁻⁹ M . Express your answer using two significant figures.
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
[OH⁻] = 7.7×10⁻⁹ M.
∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(7.7×10⁻⁹ M) = 1.29 × 10⁻⁶ M.
∵ pH = - log[H₃O⁺]
∴ pH = - log(1.29 × 10⁻⁶) = 5.88 ≅ 5.9.
Part D 1) the solution is acidic 2) the solution is basic 3) the solution is neutral
The solution is acidic, because the pH is lower than 7.
Part E A solution in which [OH−] is 140 times greater than [H+]. Express your answer using two significant figures.
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
∵ [OH⁻] = 140[H₃O⁺]
∴ [H₃O⁺](140[H₃O⁺]) = 10⁻¹⁴.
∴ 140 [H₃O⁺]² = 10⁻¹⁴.
[H₃O⁺]² = 10⁻¹⁴/ 140 = 7.14 x 10⁻¹⁷.
∴ [H₃O⁺] = √(7.14 x 10⁻¹⁷) = 8.45 x 10⁻⁹ M.
∵ pH = - log[H₃O⁺]
∴ pH = - log(8.45 x 10⁻⁹) = 8.07 ≅ 8.1.
Part F 1) the solution is acidic 2) the solution is basic 3) the solution is neutral
The solution is basic, because the pH is higher than 7.
The [H+] for solutions with given [OH−] are calculated using the ion product of water, with solutions having [H+] less than 1.0 × 10-7 being basic and those with more being acidic. The solutions for Part A and E were found to be basic while the solution for Part C was found to be acidic.
Explanation:The [H+] of a solution can be determined from its [OH−] by using the ion product of water, which is 1.0 × 10-14 at 25°C. This can be represented by the equation [H+][OH−] = 1.0 × 10-14.
For Part A, you needed to calculate [H+] for a solution with [OH−] = 4.5 × 10-4M. [H+] = 1.0 × 10-14 / [OH−] = 1.0 × 10-14 / 4.5 × 10-4= 2.2 × 10-11 M. Since [H+] is less than 1.0 × 10-7, the solution is basic.
For Part C, [OH−] is 7.7 × 10-9M. [H+] = 1.0 × 10-14 / 7.7 × 10-9= 1.3 × 10-6M. Because [H+] is higher than 1.0 × 10-7, the solution is acidic.
In Part E, the solution's [OH−] is 140 times that of [H+]. Therefore, if we let [H+] = x, we get [OH−] = 140x. Since [H+][OH−] = 1.0 × 10-14, we get x(140x) = 1.0 × 10-14. Solving for x, we get [H+] = x = 5.37 × 10-14M. Since [H+] is less than 1.0 × 10-7, the solution is basic.
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This is the sweetest of all natural sugars.
Fructose O_O
Fructose is the sweetest of the naturally-occurring sugars.
Fructose is the sweetest of all natural sugars, found in fruits, vegetables, honey, and high fructose corn syrup. It is used by plants to attract insects and animals, facilitating pollination and seed dispersal. Sucrose and lactose are other natural sugars with differing sweetness levels and roles.
Explanation:The question pertains to the identification of the sweetest of all natural sugars. The answer is fructose, which is a monosaccharide that surpasses other sugars in sweetness. Naturally occurring in fruits, vegetables, honey, and high fructose corn syrup, fructose plays a significant role in the diet and the ecosystem.
Sugars like sucrose and lactose are also prevalent in our diets, coming from sources such as sugar cane, sugar beets, and dairy, respectively. Sucrose, commonly known as table sugar, and lactose, known as milk sugar, have their unique roles and sweetness profiles. However, fructose is distinguished by its exceptional sweetness and is employed by plants as a strategy to attract insects for pollination and animals for seed dispersal, creating a beneficial relationship between fauna and flora.
Understanding the types of naturally occurring sugars and their sources can contribute significantly to our knowledge of diet, nutrition, and ecosystem interdependencies.
what happens in the space above the soft drink in a closed bottle or can as the soft drink warms to room temperature
When a soft drink starts to warm to room temperature, the air at the top of the can or bottle starts to sink into the water creating more bubbles and/or fizz. The space at the top of the can or bottle starts to shrink up.
Answer:
As the refrigerant begins to warm up to room temperature, the air inside the bottle that is between the refrigerant and the bottle cap begins to slowly come down. As you might already imagine, air in contact with the liquid can generate bubbles, and this is what happens when the air in the bottle starts to drop as the soda heats up.
Explanation:
You have seen that at room temperature it is common for soda to overflow bubbles. This is because the air inside the soda bottle begins to come down and when it comes in contact with the liquid causes a lot of bubbles and can even make the soda overflow.
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.
Why does adding sodium chloride to a saturated solution of lead chloride reduce the solubility of PbVI2?
Answer:
B) Equilibrium is pushed towards the left in the equation
PbCl2 -> Pb+2 + 2Cl-
Explanation:
We have a saturated solution of PbCl2. It means the maximum amount of PbCl2 is dissolved in the solution. If we add sodium Chloride - NaCl, the solubility will be reduced.
NaCl will dissolve into the solution forming Na+ and Cl- ions. Cl- ions are common for the PbCl2 and NaCl. The effect of increasing Cl- ions due to the NaCl will reduce the solubility of PbCl2.
It means if we add Cl- ions or Pb+2 ions independent from the component apportioning them, the solubility will be reduced for the PbCl2, and the equilibrium will be pushed towards the left in the equation
PbCl2 -> Pb+2 + 2Cl-
Finally, we can conclude that the answer is B) Equilibrium is pushed towards the left in the equation:
PbCl2 -> Pb+2 + 2Cl-
Adding sodium chloride to a saturated solution of lead chloride reduce the solubility of PbVI2 because equilibrium is pushed towards the left in the equation PbCl2 → Pb+2 + 2Cl-. Therefore, option B is correct.
What is lead chloride ?Under normal environmental circumstances, the inorganic compound lead(II) chloride is a white solid. It does not dissolve well in water. One of the most crucial lead-based reagents is lead(II) chloride. Additionally, it can be found naturally as the mineral cotunnite.
Lead nitrate is reacted with sodium chloride or hydrochloric acid to produce lead(II) chloride. It can also be produced by mixing hydrochloric acid with lead(IV) oxide. Lead and chlorine can also be reacted to create it.
Due to the additional Cl-, the reaction quotient for PbCl2 exceeds the equilibrium constant. As a result, this causes precipitation and lowers the reaction's present solubility, shifting the reaction to the left in the direction of equilibrium. Overall, adding sodium chloride causes the reaction's solubility to decrease.
Thus, option B is correct.
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Which of the following explains the increase in reaction rate caused by raising the temperature or raising the pressure of a system?
a) surface area theory
b) activation energy theory
c) potential energy theory
d) collision theory
The increase in reaction rate caused by raising the temperature or pressure is explained by collision theory, which states that reactions occur due to collisions with enough energy and proper orientation. Higher temperatures mean more energetic collisions, and increasing pressure leads to a higher frequency of collisions, both contributing to a faster reaction rate.
Explanation:The increase in reaction rate due to raising the temperature or raising the pressure of a system can be explained by d) collision theory. Collision theory posits that chemical reactions occur when reactants collide with sufficient energy and correct orientation. An increase in temperature leads to a greater number of collisions because particles move faster and have more energy, which can be converted into activation energy in a collision. Furthermore, the collisions are more forceful, making it more likely for the reactants to overcome the activation energy barrier and form products, hence increasing the rate of reaction.
Similarly, increasing the pressure in a system typically means more particles are forced into a smaller volume, thus increasing the frequency of collisions. This is especially true for reactions involving gases, where an increase in pressure often corresponds to an increase in concentration, further facilitating more frequent collisions and potentially a faster reaction rate.
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
In a covalent bond, what holds atoms together?
electrons that are shared between atoms
electrons that are transferred from one atom to another
protons that are transferred from one atom to another
a “sea of electrons” around many atoms
In covalent bonding, both atoms are trying to attract electrons--the same electrons. Thus, the electrons are shared tightly between the atoms.
The force of attraction that each atom exerts on the shared electrons is what holds the two atoms together.
Answer: Option (a) is the correct answer.
Explanation:
A covalent bond is defined as the bond which is formed due to sharing of electrons.
For example, a carbon atom has 4 valence electrons and a hydrogen atom has 1 valence electron.
So, when a carbon atom chemically combines with a hydrogen atom then sharing of electrons take place between the two and it results in the formation of a methane molecule.
[tex]C + 2H_{2} \rightarrow CH_{4}[/tex]
Whereas a bond in which transfer of electrons take place from one atom to another is known as an ionic bond.
For example, [tex]2Na + Cl_{2} \rightarrow 2NaCl[/tex]
Thus, we can conclude that in a covalent bond electrons that are shared between atoms holds atoms together.
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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Which of these is an alcohol
The answer is D!
Here is a website to prove my answer:
https://chemstuff.co.uk/unit-2/functional-groups/
The 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.
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.
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.
Consider the following balanced equation. SiO2(s)+3C(s)→SiC(s)+2CO(g) Complete the following table, showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the other reactant, as well as the moles of each product formed. If the number of moles of a product is provided, fill in the required amount of each reactant to make that amount of product, as well as the amount of the other product that is made. molSiO2 molC molSiC molCO _____ 9 _____ _____ 1 _____ _____ _____ _____ _____ _____ 26 _____ 7.5 _____ _____ 1.4 _____ _____ _____ Part A Complete the first row.
Using stoichiometry and the balanced chemical equation provided, the first row of the table is completed with 3 moles of SiO₂, 9 moles of C, 3 moles of SiC, and 6 moles of CO.
The student's question involves completing a table for a chemical reaction with known mole ratios. The balanced equation is SiO₂(s) + 3C(s) ightarrow SiC(s) + 2CO(g). To complete the table for the first row where 9 moles of carbon (C) are provided, we apply stoichiometry based on the balanced equation:
For every 3 moles of C used, 1 mole of SiO₂ is required, so 9 moles of C would need 9/3 = 3 moles of SiO₂.
For every 3 moles of C, 1 mole of SiC is produced, so 9 moles of C will yield 9/3 = 3 moles of SiC.
Each mole of SiO₂ reacts to form 2 moles of CO, so for 3 moles of SiO₂, we will get 3 × 2 = 6 moles of CO.
Therefore, the completed first row is: 3 moles of SiO₂, 9 moles of C, 3 moles of SiC, and 6 moles of CO.
Using the ratio of the given balanced equation, the completed tabel is:
molSiO2 molC molSiC molCO
3 9 3 6
1 3 1 2
13 39 13 26
2.5 7.5 2.5 5.0
1.4 4.2 1.4 2.8
From the question, we are to complete the given table:
molSiO2 molC molSiC molCO
_____ 9 _____ _____
1 _____ _____ _____
_____ _____ _____ 26
_____ 7.5 _____ _____
1.4 _____ _____ _____
The given balanced chemical equation is:
SiO₂(s) + 3C(s) → SiC(s) + 2CO(g)
This means
1 mole of SiO₂ is required to react with 3 moles of C to produce 1 mole of SiC and 2 moles of CO
The ratio of equation is:
1 : 3 : 1 : 2
Using this ratio, we can complete the given table
Thus,
Using the ratio of the balanced equation, the completed tabel is
molSiO2 molC molSiC molCO
3 9 3 6
1 3 1 2
13 39 13 26
2.5 7.5 2.5 5.0
1.4 4.2 1.4 2.8
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
Help me please.
Why does Earth rotate?
a.)Because Earth is formed from cold gases collapsing due to gravity
b.)Because the matter in the nebula that formed Earth was spinning
c.)Because Earth forms more than 99% of the mass of the solar system
d.)Because the hydrogen atoms inside the nebula fused to form helium
I think it's B but I'm not 100% sure srry if I'm wrong
____________ tautomers have a C=O and an additional C-H bond.
Ch = sh = why and find the stuff
All metals a melt at high temperatures b conduct heat and electricity c contain iron d react with air and water
The correct answer is B.
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:
Consider a pure crystalline solid that is heated from absolute zero to a temperature above the boiling point of the liquid. Which of the following processes produces the greatest increase in the entropy of the substance? A) melting the solid B) heating the liquid C) heating the gas D) heating the solid E) vaporizing the liquid
The answer is a. Melting the solid.
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.
Magnetism is an example of ______ because it is able to push and pull things.
It's a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects
In one word it is an example of a force
Magnetism is a force that certain objects called 'magnetic' objects can exert on each other without physically touching. It can push or pull things and is described by the arrangement of magnetic fields.
Explanation:Magnetism is a force that certain kinds of objects, which are called 'magnetic' objects, can exert on each other without physically touching. A magnetic object is surrounded by a magnetic 'field' that gets weaker as one moves further away from the object. This force can push or pull other objects. For example, when you bring two magnets close to each other, they can either attract or repel each other based on the arrangement of their magnetic fields.
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When the reaction 3 no(g) → n2o(g) + no2(g) is proceeding under conditions such that 0.015 mol/l of n2o is being formed each second, the rate of the overall reaction is ? and the rate of change for no is ?
Answer:
1) The rate of the overall reaction = Δ[N₂O]/Δt = 0.015 mol/L.s.
2) The rate of change for NO = - Δ[NO]/Δt = 3 Δ[N₂O]/Δt = 0.045 mol/L.s.
Explanation:
For the reaction:3NO(g) → N₂O(g) + NO₂(g).
The rate of the reaction = -1/3 Δ[NO]/Δt = Δ[N₂O]/Δt = Δ[NO₂]/Δt.
Given that: Δ[N₂O]/Δt = 0.015 mol/L.s.
1) The rate of the overall reaction is?
The rate of the overall reaction = Δ[N₂O]/Δt = 0.015 mol/L.s.
2) The rate of change for NO is?
The rate of change for NO = - Δ[NO]/Δt.
∵ -1/3 Δ[NO]/Δt = Δ[N₂O]/Δt.
∴ The rate of change for NO = - Δ[NO]/Δt = 3 Δ[N₂O]/Δt = 3(0.015 mol/L.s) = 0.045 mol/L.s.
The overall reaction rate is 0.015 mol/L·s, and the rate of change for NO is -0.045 mol/L·s. This is based on the stoichiometric coefficients in the balanced equation 3 NO(g) → N₂O(g) + NO₂(g). For every mole of N₂O formed, 3 moles of NO are consumed.
To find the rate of the overall reaction and the rate of change for NO in the reaction 3 NO(g) → N₂O(g) + NO₂(g), we start with the given information that 0.015 mol/L of N₂O is being formed each second. This implies the rate of formation of N₂O is 0.015 mol/L·s.
The rate of the reaction can be expressed using the stoichiometric coefficients from the balanced equation. Since 3 moles of NO are consumed for every 1 mole of N₂O formed, the rate of the reaction in terms of N₂O formation is:
Rate of reaction = (1/1) × 0.015 mol/L·s = 0.015 mol/L·s
Next, for the rate of change of NO, we consider the stoichiometry of the reaction. For each mole of N₂O formed, 3 moles of NO are consumed. Thus, the rate of change for NO is:
Rate of change for NO = -3 × (rate of formation of N₂O)
This gives us:
Rate of change for NO = -3 × 0.015 mol/L·s = -0.045 mol/L·s
In a calorimeter, 1.0 kg of ice melts at 0c. The enthalpy of fusion of the ice is 334 j/g. How much heat was absorbed?
= 334 kJ
Explanation;Given: 1 kg or 1000 g of ice melts at 0°C.
The enthalpy of fusion of the ice is 334 J/g
We know that; Quantity of heat absorbed = mLf
Therefore
Q = (1000 g) (334 J/g)
= 334,000 J
334,000 J * 1kJ/1000J
= 334 kJ
Answer:
In a calorimeter, 100 g of ice melts at 0oC. The enthalpy of fusion of the ice is 334 J/g.
How much heat was absorbed?
-33.4 J
-334 kJ
-334 J
-33.4 kJ (THIS IS THE ANSWER ) !!!!!
you can do it
Calculate the silver ion concentration in a saturated solution of silver(i) sulfate (ksp = 1.4 × 10–5).
Answer:
= 0.030 M
Explanation:
We can take x to be the concentration in mol/L of Ag2SO4 that dissolves
Therefore; concentration of Ag+ is 2x mol/L and that of SO4^2- x mol/L.
Ksp = 1.4 x 10^-5
Ksp = [Ag+]^2 [SO42-]
= (2x)^2(x)
= 4x^3
Thus;
4x^3 = 1.4 x 10^-5
= 0.015 M
molar solubility = 0.015 M
But;
[Ag+]= 2x
Hence; silver ion concentration is
= 2 x 0.015 M
= 0.030 M
Final answer:
The silver ion concentration in a saturated solution of silver(I) sulfate with a Ksp of 1.4 × 10–5 is approximately 1.52 × 10–2 M.
Explanation:
To calculate the silver ion concentration in a saturated solution of silver(I) sulfate, first we must understand that the dissolution of silver sulfate, Ag2SO4, in water can be represented by the equation:
Ag2SO4(s) ⇌ 2Ag+(aq) + SO42-(aq)
Applying the solubility product constant (Ksp), the equilibrium constant expression for this dissolution can be written as:
Ksp = [Ag+]2[SO42-]
Given that the Ksp for silver(I) sulfate is 1.4 × 10–5, and assuming that the concentrations of silver and sulfate ions are equal to their stoichiometric coefficients, we can set up the equation:
1.4 × 10–5 = x2[SO42-]
Where x is the molar concentration of Ag+. Since there are two moles of Ag+ for every mole of Ag2SO4 that dissolves, we can express the sulfate ion concentration as [SO42-] = x, which simplifies the equation to:
1.4 × 10–5 = (2x)2x
Now we can solve for x:
1.4 × 10–5 = 4x3
x3 = 3.5 × 10–6
x ≈ 1.52 × 10–2 M
So the concentration of silver ions, [Ag+], in a saturated solution of silver(I) sulfate is approximately 1.52 × 10–2 M.
99 points
Fluorine, a nonmetal, has an Electronegativity value of 4.0, and Chlorine, a nonmetal, has a value of 3.0. The type of bond formed will be:
ionic
covalent
metallic
no way to determine the type of bond formed
➷ It would be a covalent bond most likely. It cannot be an ionic bond as the two elements have the same number of electrons. It also couldn't be a metallic bond as they are obviously not metals.
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The following is true for electronegativity and the bonds formed between atoms:
If the difference in electronegativity is between 0 to 0.4, then the type of bond formed will likely be covalent.If the difference is between 0.5 to 1.7, the bond is likely going to be polar covalent.If the difference is greater than 1.8, then the bond will likely be ionic.The difference in electromagnetically is 1.0 (4.0-3.0=1.0). Thus, the bond will be polar covalent, which is a type of covalent bond.
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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).What are the different types of energy involved when you lift your book bag off the floor and drop it?
Kinetic energy can be one of them and potential because when u hold the book bag before dropping it there is potential energy happening
The word root for a group of microorganisms living together is a. steriliz. b. prodrom. c. coloniza. d. nosocomi.
The answer is C) Coloniza.
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.
Learn more about Chemical formulas here:https://brainly.com/question/35157423
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Must show work for questions 5 and 6. (Please also explain, I don't understand)
4. Consider the reaction. Which of the following is true?
5. What is the specific heat of Hg if it requires 166.7 J to change the temperature of 15.0 g mercury from 25.00°C to 33.00°C?
6. Consider the reaction. When a 17.2-g sample of ethyl alcohol (molar mass = 46.1 g/mol) is burned, how much energy is released as heat?
Answer:
4. E) Both A) and C) are true.
5. D) 1.39 J·°C⁻¹g⁻¹
6. C) 5.11 × 10² kJ
Step-by-step explanation:
4. Heat of reaction
H₂(g) + ½O₂(g) ⟶ H₂O(ℓ); ΔH° = -286 kJ
A) The negative sign tells you that energy has gone out of the system. Therefore, the reaction is exothermic.
B) is wrong. The reaction is exothermic.
C) If energy has left the system (and the products are part of the system), the enthalpy of the products is less than that of the reactants,
D) is wrong. Energy is released from the system.
E) Both A) and C) are correct, so E) is the correct answer.
5. Specific heat capacity
q = mCΔT
C = q/(mΔT)
Data:
q = 166.7 J
m = 15.0 g
T₁ = 25.00 °C
T₂ = 33.00 °C
Calculation:
ΔT = T₂ - T₁ = (33.00 - 25.00) °C = 8.00 °C
C = 166.7/(15.0× 8.00) = 1.39 J·°C⁻¹g⁻¹
The specific heat capacity of mercury is 1.39 J·°C·g⁻¹.
6. Heat of combustion
M_r: 46.1
C₂H₅OH + 3O₂ ⟶ 2CO₂ + 3H₂O; ΔH = -1.37 × 10³ kJ
m/g: 17.2
n =17.2/46.1 = 0.3731 mol
q = nΔH = 0.3731 × (-1.37 × 10³) = -511 kJ = -5.11 × 10² kJ
The reaction releases 5.11 × 10² kJ of heat.