Answer:
The ranking is given as; Water > Asphalt > Concrete > glass > Iron
Explanation:
The trick in solving this question is to assume a constant heat value; in this case i'll be choosing 100 J. Use this value to solve for the temperature difference. from that we can be able to rank the samples in order of their temperatures.
The formular to be used here is the;
H = MCΔT
Where;
H = Heat
M = Mass
C = Heat Capacity
ΔT = Temperature difference
ΔT = H/MC
In water;
ΔT = 100 / (10 * 4.184) = 2.39K
In Concrete;
ΔT = 100 / (10 * 0.88) = 11.36K
In asphalt;
ΔT = 100 / (10 * 0.920) = 10.87K
In glass;
ΔT = 100 / (10 * 0.84) = 11.9K
In iron;
ΔT = 100 / (10 * 0.448) = 22.3K
The samples with least temperature difference would have final temperatures and vice versa.
Our ranking is the given as; Water > Asphalt > Concrete > glass > Iron
The ranking from the least final temperature to the greatest is liquid water, asphalt, concrete, glass, iron.
The question involves understanding the concept of specific heat capacity in relation to the final temperature of different materials after the same quantity of heat is transferred. The specific heat capacity (C) is a property that defines how much heat energy is required to raise the temperature of a unit mass of a substance by one degree Celsius. The materials listed are liquid water, concrete, asphalt, glass, and iron, with specific heat capacities of 4.184 J/g°C, 0.88 J/g°C, 0.920 J/g°C, 0.84 J/g°C, and 0.448 J/g°C, respectively.
Given the relationship that the amount of heat (Q) added or removed is directly proportional to the mass (m), specific heat capacity (C), and change in temperature (ΔT), we have Q = mCΔT. With an equal amount of heat transferred and the same mass for each sample, substances with a higher specific heat capacity will experience a smaller change in temperature. Thus, to rank the final temperatures from least to greatest after the equal heat transfer, we should look at the specific heat capacities in reverse order, as a lower specific heat capacity means more temperature change for the same amount of heat.
Iron (C = 0.448 J/g°C), Glass (C = 0.84 J/g°C), Concrete (C = 0.88 J/g°C), Asphalt (C = 0.920 J/g°C), Liquid Water (C = 4.184 J/g°C)
Therefore, the final temperatures of the samples, from least to greatest, will be as follows: iron will have the highest final temperature, followed by glass, concrete, asphalt, and liquid water will have the lowest final temperature.
[H3O+] [OH−] pH Acidic or Basic 3.5×10−3 _____ _____ _____ _____ 3.8×10−7 _____ _____ 1.8×10−9 _____ _____ _____ _____ _____ 7.15 _____[H3O+] [OH−] pH Acidic or Basic 3.5×10−3 _____ _____ _____ _____ 3.8×10−7 _____ _____ 1.8×10−9 _____ _____ _____ _____ _____ 7.15 _____
Answer:
See explanation below
Explanation:
I'm assuming this is a table you need to complete, so, you are not putting this in order, but I already found it in another place. let's do a little summary of the expressions we need to use in order to complete the chart.
To calculate pH we need the following expression:
pH = -log[H3O+] (1)
From this expression we can solve for [H3O+] in case we need it:
[H3O+] = 10^(-pH) (2)
When we have [OH-] we calculate the pOH and from there, the pH:
pOH = -log[OH-] (3)
and [OH-]:
[OH-] = 10^(-pOH) (4)
Finally to get the pH from pOH:
14 = pH + pOH
pH = 14 - pOH (5)
With these 5 expressions we can complete the chart. In picture 1, you have the actual chart.
To know if it's acidic or basic, that depends on the value of pH.
If pH <7 it's acidic
If pH >7 it's basic
If pH = 7 it's neutral
First case:
[H3O+] = 3.5x10^-3
pH = -log(3.5x10^-3) = 2.46 (acidic)
pOH = 14 - 2.46 = 11.54
[OH-] = 10^(-11.54) = 2.88x10^-12 M
Second case:
pOH = -log(3.8x10^-7) = 6.42
pH = 14 - 6.42 = 7.58 (it's basic)
[H3O+] = 10^(-7.58) = 2.63x10^-8 M
Third case:
pH = -log(1.8x10^-9) = 8.74 (it's basic)
pOH = 14 - 8.74 = 5.26
[OH-] = 10^(-5.26) = 5.5x10^-6 M
Fourth case:
[H3O+] = 10^(-7.15) =7.08x10^-8 M (Basic)
pOH = 14 - 7.15 = 6.85
[OH-] = 10^(-6.85) = 1.41x10^-7 M
Hope this can help you
To determine the missing pH values and whether the solutions are acidic or basic, apply the pH calculation formula and compare the resulting pH to 7. Solutions with a pH less than 7 are acidic, and those with a pH greater than 7 are basic.
Explanation:The student has provided various concentrations of hydronium ([H3O+]) and hydroxide ([OH-]) ions and is looking to complete the table with the missing values for pH and whether the solution is acidic or basic. To find the pH, use the formula: pH = -log[H3O+]. If the resulting pH is less than 7, the solution is acidic, and if it's greater than 7, the solution is basic. A solution is neutral if its pH is exactly 7.
Using this information, for a solution with [H3O+] = 3.5×10⁻³ M, calculate the pH and determine the acidity. Similarly, for [H3O+] = 3.8×10⁻⁷ M and [H3O+] = 1.8×10⁻⁹ M, calculate their pHs. The solution is considered acidic if [H3O+] > 1×10⁻⁷ M. For pH = 7.15, the solution is slightly basic because the pH is greater than 7.
Two sources of copper are cuprite, which has the IUPAC name copper(I) oxide, and malachite, which has the formula Cu2CO3(OH)2. Copper is used in home wiring and electric motors because it has good electrical conductivity. Other uses of copper not related to its electrical conductivity include coins, plumbing, roofing, and cooking pans.Aluminum is also used for cooking pans. At room temperature, the electrical conductivity of a copper wire is 1.6 times greater than an aluminum wire with the same length and cross-sectional area. At room temperature, the heat conductivity of copper is 1.8 times greater than the heat conductivity of aluminum. At STP, the density of copper is 3.3 times greater than the density of aluminum. Identify one physical property of aluminum that could make it a better choice than copper for a cooking pan.
Answer:
See explanation below
Explanation:
This is a four part question, however, I will answer only the question you are asking which is, the property of aluminum that could make a better choice over than copper for a cooking pan.
As it was stated in the question, Copper has a higher density than the aluminum, therefore, copper would weight more than aluminum, making more difficult to manage. Aluminum then, has less mass than copper, and this is more effective and comfortable to use rather than a copper pan, that weight more and it could be very noisy to manage, than an aluminum pan with the same size.
If density of copper is 3.3 times greater, means that the mass of copper is also 3.3 times greater, therefore, if an aluminum pan weights about 400 g, a copper pan will weight more than 1.2 kg, and that's more difficult to manage and for the use.
The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the range of 25 to 45 lb/in.2. Suppose a tire has a pressure of 36.0 lb/in.2 . Convert 36.0 lb/in.2 to its equivalent in atmospheres. Express the pressure numerically in atmospheres.
To convert pressure from lb/in^2 to atmospheres, you divide the pressure in lb/in^2 by 14.7 (1 atm). Therefore, 36.0 lb/in^2 is approximately equivalent to 2.45 atmospheres.
Explanation:
The pressure of 36.0 lb/in^2, often used in car tires, can be converted into equivalents in atmospheres (atm) using known conversion factors. First, we know that 1 atmosphere is equivalent to 14.7 psi (pounds per square inch), which is a measure of pressure. Therefore, to convert the pressure of 36.0 lb/in^2 into atmospheres, you just divide the PSI by 14.7. So, 36.0 lb/in^2 divided by 14.7 (which represents 1 atm) equals approximately 2.45 atm. Thus, 36.0 lb/in^2 is equivalent to approximately 2.45 atmospheres.
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Luis is helping his parents paint a border around the walls of a room. He uses a stencil to repeat the same design on each wall to form one long grapevine with a bunch of grapes every foot along its length. What type of chemical reaction does this best model?
a. replacement.
b. decomposition.
c. polymerization.
d. synthesis.
Answer: c polymerization
Explanation:
Reactions are said to involve the reactants and the products. The type of reaction that involves the repetition of the same pattern over and again is said to be polymerization. Thus, option c is correct.
What is a polymerization reaction?The polymerization reaction is the type of reaction that occurs in the monomer molecules so that three-dimensional polymer chains of the macromolecules can be produced.
This type of reaction is common in carbohydrates where the single unit of sugar (monomer) undergoes changes to form the long chains of polymers by the addition or condensation process.
Luis is using the polymerization reaction as he is using the same stencil to draw over the pattern in a repetitive manner on the wall to make it look like a border or whole sequence.
Therefore, option c. the model best represents the polymerization reaction.
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Which two carbohydrates have the most similar function?
A.starch and glycogen
B. starch and cellulose
C.glycogen and glucose
D.cellulose and glucose
Answer:
C.
Explanation:
C. Glucose is stored in the liver as glycogen.
Both A. Starch and glycogen have the most similar functions among the given carbohydrates.
Explanation:The two carbohydrates that have the most similar function are starch and glycogen. Both starch and glycogen are storage forms of glucose in plants and animals, respectively. They serve as a source of energy and are broken down into glucose when needed. Starch is found in plants, while glycogen is found in animals, but they both share the function of storing energy.
Thus, starch and glycogen serve similar functions as energy-storage molecules in living organisms. Both are polysaccharides composed of glucose units linked together. Plants store energy as starch, primarily in roots and seeds, while animals store energy as glycogen in the liver and muscles. These carbohydrates can be broken down to release glucose for energy when needed.
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disadvantages of biodegradable plastics
1) The main disadvantage of bio plastics is that when they break down , carbondioxide is released and results into global warming.
2) They are designed to be composted , not recycled.
3) fewer proper composting availability.
4) plants grown for bioplastics have negative impacts of their own.
Final answer:
Biodegradable plastics have several disadvantages including difficulty in breaking down in anaerobic landfill conditions, potential contamination of water resources, challenges in recycling, and threats to wildlife and marine life. These issues highlight the need for better waste management and alternatives to plastic use.
Explanation:
Disadvantages of Biodegradable Plastics
While biodegradable plastics are designed to break down more quickly than conventional plastics, they present several disadvantages. Most commonly-used polymers do not degrade readily, especially under anaerobic conditions of landfills. When decomposition occurs, it may lead to leachates that can contaminate water sources. Another issue is in the recycling industry, which faces challenges due to the vast amount of plastic waste, making it difficult to manage safe incineration and potential landfill overflow. It's also worth noting that plastics recycling has become a major industry confronted with its own problems.
The incessant use of plastics comes with a variety of environmental threats, including air and water pollution from residual or degradation products. More so, plastics endanger wildlife due to animals and marine life mistaking them for food. Despite recycling efforts, plastic water bottles remain problematic due to their wide use and disposal in non-residential areas.
Therefore, the continued use of plastics ought to be reevaluated given the substantial environmental impact, leading to considerations for alternative materials or more robust recycling programs.
Mirrored Conclusion
Every single plastic bottle reaching a landfill symbolizes an environmental footprint that could span centuries in decomposition. As consumers, considering alternatives is essential to mitigate the environmental damage caused by plastic waste.
Which of the following are organic compounds?
Select all that apply.
ozone (O3)
propane (C3H8)
methane (CH4)
water (H2O)
Answer:
Propane and methane
Explanation:
The organic compounds are the one that has Carbon (C) as its principal component. Most organic compounds are made up of carbon, hydrogen and oxygen atoms, often combined with others such as nitrogen, phosphorus or sulfur .
Which items contain plasma?
a. gelatin
b. lightning
c. a fluorescent light bulb
d. lava
Answer: Lightning and a fluorescent light bulb items contain plasma.
Explanation:
Plasma is defined as a state of matter which contains hot ionized gas having positively charged ions and negatively charged electrons.
For example, lightening and a fluorescent light bulb has plasma as the state of matter.
On the other hand, gelatin is a solid at room temperature as its molecules are closely packed to each other forming a fixed shape with fixed volume.
Lava is a molten rock which is actually present in liquid state.
Therefore, we can conclude that out of the given options both lightning and a fluorescent light bulb items contain plasma.
Answer: lightning
Explanation:
Read the false statement. There are 18 periods in the periodic table. Which answer choice rewords the false statement so it is true?
a.There are 18 elements in each period of the periodic table.
b.There are 18 groups in the periodic table.
c.There are 8 periods in the periodic table.
d.There are 8 elements in each group of the periodic table.
There are 7 periods and 18 groups in a periodic table thus the statement that rewords the false statement so it is true is b.
Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
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Which of the following happens in hydrogenation? Question 9 options: A) Hydrogen atoms are added to fats to make them more saturated. B) Cholesterol is extracted from a product. C) Fats are made less saturated by removing hydrogen atoms. D) A saturated fat becomes a polyunsaturated fat. E) A solid fat becomes a liquid fat.
Answer : The correct option is, (A) Hydrogen atoms are added to fats to make them more saturated.
Explanation :
Hydrogenation : Hydrogenation means to treat with hydrogen that means it is a chemical reaction between the molecular hydrogen and the another compound or an element in the presence of catalyst like, nickel, palladium etc.
When an organic compound is hydrogenated then it becomes more saturated with the hydrogen atoms.
The largest scale application of hydrogenation is the processing of vegetable oils. Typically, vegetable oils are derived from polyunsaturated fatty acids. Their partial hydrogenation reduces most but not all of these carbon-carbon double bonds.
Liquid fats : They have the highest degree of unsaturation. Vegetable and marine oils are liquid fats.
Solid fats : They are highly saturated. Vegetable and animal fats are solid fats.
Hence, the correct option is, (A) Hydrogen atoms are added to fats to make them more saturated.
Which of the following molecules has an angular (bent) geometry that is commonly represented as a resonance hybrid of two or more electron-dot structures?
(A) CO2
(B) O3
(C) CH4
(D) BeF2
(E) OF2
Answer:B
Explanation:
Below is attached an image of ozone and the resonance structures. Ozone is an angular (Bent) molecule as seen in the image below. It is best described by resonance structures as shown.
From the options, the molecule that has an angular geometry and is commonly represented as a resonance hybrid is : ( B ) O₃
The Ozone gas is a reactive gas that is formed by the bonding of three oxygen atoms. it occurs in the atmosphere as man-made or natural gas. its geometry is angular as it is a resonance that represents the two or more electron dot structures ( combination of three oxygen atoms ).
Hence we can conclude that the molecule from the options above that has an angular geometry is the Ozone gas ( O₃ ).
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For the reaction 2 SO 2 ( g ) + O 2 ( g ) − ⇀ ↽ − 2 SO 3 ( g ) the equilibrium constant is K c = 15 M − 1 at 850 K . Three sets of concentrations are given for the three gases in the reaction. For each set, predict the direction in which the net reaction will proceed toward equilibrium. Left No net reaction Right (SO2)=0.16M (SO2)=0.20M (SO2)=0.50M (O2)=0.20M (O2)=0.60M (O2)=0.60M (SO3)=0.50M (SO3)=0.60M (SO3)=0.15M
Answer:
2SO₂(g) + O₂(g) ↔ 2SO₃(g) Kc = 15M⁻¹
The sets are:
(A) (SO₂)=0.16M; (O₂)=0.20M; (SO₃)=0.50M
(B) (SO₂)=0.20M; (O₂)=0.60M; (SO₃)=0.60M
(C) (SO₂)=0.50M; (O₂)=0.60M; (SO₃)=0.15M
The reaction quotient is
Q = [tex]\frac{[SO_{3}]^2}{[SO_{2}]^{2}*[O_{2}] }[/tex]
If Q < Kc, then the reaction will proceed towards the right (products)If Q > Kc, then the reaction will proceed towards the left (reactants)If Q = Kc, then we're at equilibrium.Now we calculate Q for each of the sets:
(A) Q = 0.50² / (0.16²*0.20) = 48.8
Q > Kc. So the reaction will proceed towards the left.
(B) Q = 0.60² / (0.20²*0.60) = 15
Q = Kc. So the reaction is at equilibrium.
(C) Q = 0.15² / (0.50²*0.60) = 0.15
Q < Kc. So the reaction will proceed towards the right.
What is the molarity (M) of a solution that contains .25 moles of a compound in 1.8 L of solution?
Answer:
The answer to your question is 0.14 M
Explanation:
Data
Molarity = ?
number of moles = 0.25
volume = 1.8 L
Formula
[tex]Molarity = \frac{number of moles}{volume}[/tex]
Substitution
[tex]Molarity = \frac{0.25}{1.8}[/tex]
Simplification and result
Molarity = 0.14 M
Which of the following would be considered the most hazardous condition onboard a vessel
Answer: the most hazardous condition onboard a vessel is not having enough life jackets.
Explanation: a life jacket is a piece of equipment designed to assist a wearer to keep afloat in water in the event of an emergency and are considered life-saving equipment.
Suppose you are titrating an acid of unknown concentration with a standardized base. At the beginning of the titration, you read the base titrant volume as 2.94 mL. After running the titration and reaching the endpoint, you read the base titrant volume as 16.47 mL. What volume of base was required for the titration?
Answer:
The volume of base was required for the titration is 13,53mL
Explanation:
In a titration of an acid (HX) with a base (YOH), the reaction of neutralization is:
HX + YOH → YX + H₂O
In the burette you are adding base until all HX reacts. The addition of base is in volume.
If in the beginnig, the volume that you read of base is 2,94mL and at the endpoint you read a volume of 16,47mL. The volume you spent in the titration that is the same volume of base you required for the titration is:
16,47mL - 2,94mL = 13,53mL
I hope it helps!
To find out the volume of base required for the titration, subtract the initial volume from the final volume. In this case, the calculation would be 16.47 mL - 2.94 mL, which equals 13.53 mL of base.
Explanation:To calculate the volume of the base required for the titration, simply subtract the initial volume of the titrant from the final volume. In this case, we subtract the initial reading of the base titrant volume(2.94 mL) from the final reading after reaching the endpoint (16.47 mL).
So, the calculation would be: 16.47 mL - 2.94 mL = 13.53 mL
Therefore, 13.53 mL of base was required for the titration. This is the volume that was consumed to neutralize the acid to the endpoint.
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"Professor Offenrokker has a solution that is 6.0 x 10-3 M of HCl of a solution. However, he needs 450 mL of a 6.0 x 10-4 M HCl solution. How much of the stock solution will he need to make the dilute solution?"
Answer : The volume of the stock solution he need to make the dilute solution will be, 45 mL
Explanation :
According to dilution dilution law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated solution
[tex]M_2[/tex] = molarity of dilute solution
[tex]V_1[/tex] = volume of concentrated solution
[tex]V_2[/tex] = volume of dilute solution
Given:
[tex]M_1[/tex] = [tex]6.0\times 10^{-3}M[/tex]
[tex]M_2[/tex] = [tex]6.0\times 10^{-4}M[/tex]
[tex]V_1[/tex] = ?
[tex]V_2[/tex] = 450 mL
Now put all the given values in the above formula, we get:
[tex](6.0\times 10^{-3}M)\times V_1=(6.0\times 10^{-4}M)\times 450mL[/tex]
[tex]V_1=45mL[/tex]
Therefore, the volume of the stock solution he need to make the dilute solution will be, 45 mL
Which factor distinguishes a metallic bond from an ionic bond or a covalent bond?
a. the mobility of protons
b. the equal sharing of electrons
c. the unequal sharing of electrons
d. the mobility of electrons
Answer:
d. the mobility of electrons
Explanation:
Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking place in the bond. It is generally formed between the atoms with similar electronegativity values.
Metallic bond is the bond which is formed by electrostatic attraction force between the positively charged metal ions and the conduction electrons.
Thus, in metallic bond, there is a formation of conduction band and the valence band where the electrons have mobility and have transitions in between them but in covalent bonding, the electrons are shared in the bond and are not mobile.
Answer:
D. the mobility of electrons
The diphosphate ion is a biologically important polyatomic ion. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate ion?
Answer:
The symbols of the diphosphate ion is P₂O₇⁴⁻
Explanation:
The compound Ca₂P₂O₇ is known as Calcium pyrophosphate. for the compound to be formed, two ions are put together. The cation Ca²⁺ and the anion P₂O₇⁴⁻. The oxidation state of calcium is always +2. The anion has to have a charge of -4 to make the formula Ca₂P₂O₇.
symbol Ca P₂O₇
oxidation state +2 -4
valency 2 4
Crossing the valency and finding the ratio of the valency after crossing
= Ca₄ (P₂O₇)₂
= Ca₂P₂O₇
Which is a cationic detergent having four organic groups attached to a nitrogen atom and used to sanitize utensils? Select one:
a. Propionic acid
b. Quaternary ammonium compound
c. Ethylene oxide
d. Methylene blue
Answer:B
Explanation:
A quaternary ammonium compound contains a nitrogen atom to which four atoms or groups are attached leaving a positive charge on the nitrogen. This compound is now cationic in nature and can be used as a cationic detergent.
How many Cl- ions are there in 400.5 grams of AlCl3?
A. 9.000 ions
B. 1.500 X 10^-23 ions
C. 1.810 X 10^24 ions
D. 5.420 X 10^24 ions
Answer:
The answer to your question is letter A
Explanation:
Process
1.- Calculate the molecular mass of AlCl₃
Al = 1 x 27 = 27
Cl = 3 x 35.5 = 106.5
AlCl₃ = 27 + 106.5 = 133.5
2.- Find the number of ions of Cl using proportions
133.5 grams of AlCl₃ ------------- 3 ions of Chlorine
400.5 grams of AlCl₃ ------------ x
x = (400.5 x 3) / 133.5
x = 9
Answer:
d
Explanation:
the answer is d because when you solve it's d
During the flood recovery process, you should empty all containers that contain contaminated water and clean them with dilute chlorine bleach.A) TrueB) False
Answer:
True
Explanation:
True
As we know that quality of floodwater is highly poor therefore it is the utmost duty of everyone suffered from flood to clear all the container before use because it is needed to kill all bacteria that grow inside the container due to contact with floodwater. It may be have very high chances that the flood water may have contact with drainage water or sewage, therefore it is compulsion now to clan all container with dilute chlorine bleach
When information-processing theorists use the term hardware, they are often referring to _____a) the brain structures involved in memory.b) the serial position effect.c) the skull that covers and protects the brain.d) the positive bias of memory.
Answer:
A. The brain structures involved in memory
Explanation:
When information-processing theorists use the term hardware, they are often referring to the brain structures involved in memory.
The molarity of a sodium hydroxide (NaOH) solution is 0.2 M. The molar mass of NaOH is 40 g/mol. If the solution contains 20 g of sodium hydroxide dissolved in water, what is the volume of the solution? brainly
Answer:
[tex]\large \boxed{\text{2.5 L}}[/tex]
Explanation:
1. Calculate the moles of NaOH.
[tex]\text{Moles} = \text{20 g} \times \dfrac{\text{1 mol}}{\text{40 g}} = \text{0.50 mol}[/tex]
2. Calculate the volume of NaOH
[tex]\begin{array}{rcl}\\\text{Molar concentration} &= &\dfrac{\text{moles}}{\text{litres}}\\\\ n &= &\dfrac{c}{V}\\\\\dfrac{\text{0.2 mol}}{\text{1 L}} &=& \dfrac{\text{0.50 mol}}{V}\\\\ \dfrac{0.2V}{\text{1 L}} & = & 0.50\\\\0.2V &= & \text{0.50 L}\\V & = & \dfrac{\text{0.50 L}}{0.2}\\\\& = & \textbf{2.5 L}\\\end{array}\\\text{The volume of the solution is $\large \boxed{\textbf{2.5 L}}$}[/tex]
Answer:
The 0.2M NaOH solution has a volume of 2.5 L
Explanation:
Step 1: Data given
Molarity of a NaOH solution = 0.2 M
Molar mass of NaOH = 40 g/mol
Mass of NaOH = 20.00 grams
Step 2: Calculate moles of NaOH
Moles = mass / molar mass
Moles NaOH = 20.00 grams / 40 g/mol
Moles NaOH = 0.50 moles
Step 3: Calculate volume
Molarity = moles / volume
Volume of solution = moles of NaOH / Molarity
Volume of solution = 0.50 moles / 0.2 M
Volume of solution = 2.5 L
The 0.2M NaOH solution has a volume of 2.5 L
The pyruvic acid from glycolysis can be converted to acetic acid, which can enter the citric acid cycle. Because this process is a cycle, the atoms entering the cycle must balance the atoms that leave. Consider carbon balance in the citric acid cycle. How many CO 2 molecules leave the cycle for each acetic acid molecule that enters? For this question, assume that carbon only enters as acetic acid and exits as CO 2 . Note that acetic acid has two carbon atoms. You can determine the number of carbon atoms in carbon dioxide from its formula, CO 2 .
Answer: 2CO2, 8CO2
Explanation:
During glycolysis one molecule of glucose is oxidized to two molecules of pyruvic acid (3 carbon molecule). Pyruvic acid is converted to acetyl CoA(2 carbon molecule) by the pyruvate dehydrogenase complex.
For each acetic acid that enters the citric acid cycle 2 molecules of CO2 is given off.
For one glucose molecule produces 2 acetyl CoA
2 acetyl groups + 6 NAD+ + 2 FAD + 2 ADP + 2 Pi yields 4 CO2 + 6 NADH + 6 H+ + 2 FADH2 + 2 ATP.
Hence 4 molecules of acetic acid is completely oxidized to 8 molecules of CO2.
Final answer:
Each acetic acid molecule that enters the citric acid cycle results in the release of two CO2 molecules, reflecting the removal of both carbon atoms originally present in the acetic acid.
Explanation:
The student's question pertains to how many molecules of carbon dioxide (CO2) are produced in the citric acid cycle for each acetic acid molecule that enters the cycle. Acetic acid, which becomes part of acetyl-CoA, has two carbon atoms.
During the citric acid cycle, each acetyl group (from the acetyl CoA) will eventually release all of its carbon atoms as CO2. Since each acetic acid molecule contributes two carbon atoms to the cycle, and each turn of the cycle produces two CO2 molecules, it follows that for each acetic acid molecule that enters, two CO2 molecules are released.
These CO2 molecules may not be the same ones that entered most recently, but over successive turns of the cycle, all carbon atoms are accounted for and released as CO2.
Which of the following criteria are used to determine if a substance is a neurotransmitter? I. The chemical must be synthesized in the neuron. II. When the neuron is active, the chemical is released and produces a response. III. Injection of the chemical mimics the effects of neuronal stimulation. IV. Mechanisms exist for the removal of the chemical.
Answer:
Explanation:
All of them. Dopamine is a neurotransmitter.
1. Dopamine is synthesized in the neuron by hydroxylating L-tyrosine via Tyrosine Kinase pathway.
2. Dopamine activates neuronal brain function.
3. Injection of L-DOPA mimics the dopamine and effects the same as neuronal stimulation.
4. Dopamine is converted to Adrenaline/Noradrenaline by Kinases and further removed from Kidneys by glucronidation.
what is the molecular formula of a compound with an empiricla formula of ch and a molecular mass of 78
Answer:
C6H6
Explanation:
We can obtain the molecular formula from the empirical formula.
What we need do here is:
(CH)n = 78
The n shows the multiples of both element present in the actual compound. It can be seen that carbon and hydrogen have the same element ratio here. We then use the atomic masses of both elements to get the value of n. The atomic mass of carbon is 12 a.m.u while the atomic mass of hydrogen is 1 a.m.u
(1 + 12)n = 78
13n = 78
n = 78/13 = 6
The molecular formula is
(CH)n = (CH)6 = C6H6
A plasma-screen TV contains thousands of tiny cells filled with a mixture of Xe, Ne, and He gases that emits light of specific wavelengths when a voltage is applied. A particular plasma cell, 0.900 mm×0.300mm×10.0mm, contains 4.00%Xe in a 1:1 Ne : He mixture at a total pressure of 500. torr. Assumptions: In order to calculate total moles of gas and total atoms, we assumed a reasonable room temperature. Since '4.00% Xe' was not defined, we conveniently assumed mole percent. The 1:1 relationship of Ne to He is assumed to be by volume and not by mass.Part A) Calculate the number of Xe atoms in the cell. Part B) Calculate the number of Ne atoms in the cell. Part C) Calculate the number of He atoms in the cell.
Answer:
(a) 1.77*10^15 Xe atoms
(b) 2.10*10^16 Ne atoms
(c) 2.10*10^16 He atoms
Explanation:
Total V = 0.900 mm * 0.300mm * 10.0mm
Total V = 2.7mm cubed
Converting cubed to litres:
2.7mm cubed = 2.7 * 10^-6 Liters
Converting pressure from torr to atm,
(500 torr) * (1 atm ÷ 760 torr) = 0.6578947368 atm
Room temperature is assumed to be 21 degrees celcius, or 294.15 Kelvin
Applying Ideal Gas Equation:
PV = nRT
Therefore, n = PV ÷ RT,
n = [(2.7*10^-6 Liters)(.6578947368 atm)] ÷ [(0.08206)(294.15)]
n = 7.359017079 * 10^-8
Therefore, the total moles present in plasma is 7.359017079 * 10^-8.
(a) To find Xe atoms,
Multiply the total moles present by 4 percent. Therefore,
(7.359017079 * 10^-8)(.04) = 2.943606832*10^-9,
this value gives you Xe moles.
Then multiply by Avogadro's constant:
[(2.943606832*10^-9)(6.022*10^23)] = 1.77*10^15 Xe atoms
(b) and (c) are the same.
Using the total moles number we found in the beginning and minus the number of moles for Xe.
We have:
7.359017079 * 10^-8 - 2.943606832*10^-9 = 7.064656396*10^-8
And Since Ne and He are in a 1:1 ratio, divide this number by two.
We have:
7.064656396*10^-8 ÷ 2 = 3.532328198*10-8 moles
By multiplying this number by Avogadro's number we get atoms:
[(3.532328198*10-8 moles)(6.022*10^23)] = 2.10*10^16
Therefore, the answer for both (b) and (c) is 2.10*10^16.
Using the Ideal Gas Law and Avogadro's Law, along with the given pressure and compositional information, we can calculate the total number of Xenon, Neon, and Helium atoms in the given plasma cell.
Explanation:This question is asking for the calculation of the number of Xenon (Xe), Neon (Ne), and Helium (He) atoms within a plasma cell. Starting from the total pressure of the gas mixture, the Ideal Gas Law, which is PV = nRT (where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature), can be used to calculate the total moles of the gas mixture.
Here we assume standard ambient temperature, which is usually 298K. From that, we can calculate the total number of atoms in the cell using Avogadro’s Law, 1 mole = 6.022*10^23 atoms. Using the given percentage of Xe, and the 1:1 Ne:He ratio, we can determine the number of each atom respectively.
It's worth noting that factors like temperature and density indeed play a significant role in the behavior of gases and the calculation of moles and atoms. However, in this simplified scenario, these factors are either given or assumed to be standard.
Learn more about Ideal Gas Law & Avogadro's Law here:https://brainly.com/question/10511054
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C6H12O6 + 6O2 ---> 6H2O + 6CO2
How many electrons are transferred in the reaction represented by the balanced equation above?
Answer:
24e⁻ are transferred by the reaction of respiration.
Explanation:
C₆H₁₂O₆ + 6O₂ → 6 H₂O + 6CO₂
This is the reaction for the respiration process.
In this redox, oxygen acts with 0 in the oxidation state on the reactant side, and -2 in the product side - REDUCTION
Carbon acts with 0 in the glucose (cause it is neutral), on the reactant side and it has +4, on the product side - OXIDATION
6C → 6C⁴⁺ + 24e⁻
In reactant side we have a neutral carbon, so as in the product side we have a carbon with +4, it had to lose 4e⁻ to get oxidized, but we have 6 carbons, so finally carbon has lost 24 e⁻
6O⁻² + 6O₂ + 24e⁻ → 6O₂²⁻ + 6O⁻²
In reactant side, we have 6 oxygen from the glucose (oxidation state of -2) and the diatomic molecule, with no charge (ground state), so in the product side, we have the oxygen from the dioxide with -2 and the oxygen from the water, also with -2 at the oxidation state. Finally the global charge for the product side is -36, and in reactant side is -12, so it has to win 24 e⁻ (those that were released by the C) to be reduced.
A valence electron from an arsenic atom might have an electron with the following set of quantum numbers in the ground state.
a. n= 4; L= 1; m1= 0; ms= +½
b. n= 4; L= 1; m1= 2; ms= â½
c. n= 3; L= 1; m1= 0; ms= +½
d. n= 5; L= 1; m1= â1; ms= â½
e. n= 4; L= 2; m1= +1; ms= +½
Answer:A
Explanation:
Arsenic is a p-block non-metal in group 15. It is found in the 4th period with electron configuration [Ar] 3d10 4s2 4p3
The outermost electrons are 4s2 4p3. The quantum number that fits an electron in the 4p orbital is option A
Since n=4,l=1, m= -1,0,1 ms=±1/2
Which equation correctly relates the heat of reaction to the standard heats of formation?
∆H° = ∆Hf ° (products) + ∆Hf ° (reactants)
∆H° + ∆Hf ° (products) = ∆Hf ° (reactants)
∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)
∆H° – ∆Hf ° (reactants) = ∆Hf ° (products)
Answer:
D
Explanation:
∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)