2. What is heat? Under what condition/s is it transferred from one system to another? 3. (a) As snowmaking machine contains a mixture of compressed air and water vapor at about 20 atm. When the mixture is spread to the atmosphere, it expands so rapidly that, as a good approximation, no heat exchange occurs between the system (air and water) and its surroundings. (In thermodynamics, such a process is called a diabetic process.) Do a first law of thermodynamics analysis to show how snow is formed under these conditions. 4. (a) A person drinks 4 glasses of cold water (3.0 C) every day. The volume of each glass is 2.5 X 10° mL. How much heat (in kJ) does the body have to supply to raise the temperature of the water to 37 C, the body temperature. (b) How much heat would your body lose if you were to ingest 8.0 X 10 g of snow at OC to quench your thrust? (The amount of heat necessary to melt snow is 6.01 kJ/mol.) What is meant by the rate of a chemical reaction? 5. What is meant by the rate of a chemical reaction? Can you suggest two reactions that are very slow (take days or longer to complete) and two reactions that are very fast (are in minutes or seconds)? 6. Consider the reaction, A B. The rate of the reaction is 1.6 X 102 M/s when the concentration of A is 0.35 M. Calculate the rate constant if the reaction is (a) first order in A, (b) second order in A. 7. The equilibrium constant Kp for the reaction 2SO3(g) = 2SO2(g) + O (g) is 5.0 X 10 at 302 C. What is the Ke for this reaction?
2. What is heat? Under what condition/s is it transferred from one system to another? 3. (a) As snowmaking machine contains a mixture of compressed air and water vapor at about 20 atm. When the mixture is spread to the atmosphere, it expands so rapidly that, as a good approximation, no heat exchange occurs between the system (air and water) and its surroundings. (In thermodynamics, such a process is called a diabetic process.) Do a first law of thermodynamics analysis to show how snow is formed under these conditions. 4. (a) A person drinks 4 glasses of cold water (3.0 C) every day. The volume of each glass is 2.5 X 10° mL. How much heat (in kJ) does the body have to supply to raise the temperature of the water to 37 C, the body temperature. (b) How much heat would your body lose if you were to ingest 8.0 X 10 g of snow at OC to quench your thrust? (The amount of heat necessary to melt snow is 6.01 kJ/mol.) What is meant by the rate of a chemical reaction? 5. What is meant by the rate of a chemical reaction? Can you suggest two reactions that are very slow (take days or longer to complete) and two reactions that are very fast (are in minutes or seconds)? 6. Consider the reaction, A B. The rate of the reaction is 1.6 X 102 M/s when the concentration of A is 0.35 M. Calculate the rate constant if the reaction is (a) first order in A, (b) second order in A. 7. The equilibrium constant Kp for the reaction 2SO3(g) = 2SO2(g) + O (g) is 5.0 X 10 at 302 C. What is the Ke for this reaction?
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.100PAE: 9.100 Two baking sheets are made of different metals. You purchase both and bake a dozen cookies on...
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Pls help me in #2,6 and 7
Transcribed Image Text:1. Describe the interconversions of forms of energy occurring in these processes: (a) You throw a softball
up into the air and catch it. (b) You switch on a flashlight. (c) You ride a ski lift to the top of the hill and
then skid down. (d) You strike a match and let it burn down.
2. What is heat? Under what condition/s is it transferred from one system to another?
3. (a) As snowmaking machine contains a mixture of compressed air and water vapor at about 20 atm. When
the mixture is spread to the atmosphere, it expands so rapidly that, as a good approximation, no heat
exchange occurs between the system (air and water) and its surroundings. (In thermodynamics, such a
process is called a diabetic process.) Do a first law of thermodynamics analysis to show how snow is
formed under these conditions.
4. (a) A person drinks 4 glasses of cold water (3.0 C) every day. The volume of each glass is 2.5 X 10° mL.
How much heat (in kJ) does the body have to supply to raise the temperature of the water to 37 C, the
body temperature. (b) How much heat would your body lose if you were to ingest 8.0 X 10 g of snow at
OC to quench your thrust? (The amount of heat necessary to melt snow is 6.01 kJ/mol.) What is meant by
the rate of a chemical reaction?
5. What is meant by the rate of a chemical reaction? Can you suggest two reactions that are very slow (take
days or longer to complete) and two reactions that are very fast (are in minutes or seconds)?
6. Consider the reaction, A B. The rate of the reaction is 1.6 X 102 M/s when the concentration of A
is 0.35 M. Calculate the rate constant if the reaction is (a) first order in A, (b) second order in A.
7. The equilibrium constant Kp for the reaction 2SO3(g) = 2SO:(g) + 0 (g) is 5.0 X 104 at 302 C. What
is the Ke for this reaction?
8. Ethanol is a toxic substance that, when consumed in excess, can impair respiratory and cardiac functions
by interference with the neurotransmitters of the nervous system. In the human body, ethanol is
metabolized by the enzyme alcohol dehydrogenase to acetaldehyde, which causes "hangovers". (a) Based
on your knowledge on enzyme kinetics, explain why binge drinking (i.e. consuming too much alcohol too
fast) can prove fatal. (b) Methanol is even more toxic than ethanol. It is also metabolized by alcohol
dehydrogenase, and the product, formaldehyde, can cause blindness or death. An antidote to methanol
poisoning is ethanol. Explain how this procedure works.
9. Define Bronsted acids and bases. How do the Bronsted definitions differ from Arhenius's defintions of
acids and bases?
10. Calculate the hydrogen ion concentration in moles per liter for each of these solution: (a) a solution whose
pH is 5.20, (b) a solition whose pH is 16.00, (c) a soltuion whose hydroxide concentration is 3.7 X 10
M.
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