CHEM 4005 Lecture Notes - Lecture 7: Exothermic Process, Thermodynamics, Buffer Solution

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yellowcattle191

8 Jun 2017

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What is the study of energy, heat, and work. What reaction is divided into systems and surrounding. What is abbreviated as s and us the measure if the randomness of a system. The change in internal energy of a system is equal to the product of work and heat. The universe tends toward increasing disorder or randomness. A substance that is perfectly crystalline at 0 k has an entropy of zero. What is the equation for free energy delta g= delta h- t delta s. What is the equation for the change in reactions. What are the variables for change in reactions. The number of calories of heat needed to raise the temp. What is the instrument used to measure specific heat. What is the study of rate or speed of a reaction. What factors affect reaction rates: size, temperature, concentration, nature of reactants, presence of a catalyst. What speeds up a reaction but is not permanently changed.

Related Questions

1.According to the following thermochemical equation, if 31.1 g of NO2 is produced, how much heat is released at constant pressure?how much heat is released at constant pressure?

2NO(g) + O2(g) â 2NO2(g);ÎHÂ° = â114.4 kJ

Select one:

a. 114.4 kJ114.4 kJ

b. 1.183Ã103kJ

c. 2.365Ã103kJ

d. 38.7 kJ

e. 1.088Ã105kJ

2.CalculateâââÎUâââof a gas for a process in which the gas absorbs ââ12 J ââof heat and does ââ20 Jââ of work by expanding.

Select one:

a. 8 J

b. 32 J

c. -32 J

d. 0, because âÎU is a state function

e. -8 J

3.If q = +56 kJ for a certain process, that process

Select one:

a. requires a catalyst.

b. is exothermic.

c. occurs rapidly.

d. is endothermic.

e. cannot occur.

4.If q = 18 kJ and w = 15 kJ for a certain process, that process

Select one:

a. requires a catalyst.

b. has an increase in internal energy.

c. occurs slowly.

d. is exothermic.

e. cannot occur.

5.What is the change in internal energy of the system (ÎU) if 10 kJ of heat energy is released by the system and â70 kJâ of work is done on the system for a certain process?

Select one:

a. â60 kJ

b. 80 kJ

c. 10 kJ

d. 60 kJ

e. â80 kJ

6.What is the quantity of heat evolved at constant pressure when ââ26.3 gââ H2O(l)ââ is formed from the combustion of H2(g) and O2(g)?

2H2(g) + O2(g) â 2H2O(l);ÎHÂ° = â571.6 kJ

Select one:

a. 15033 kJ

b. 15.03 kJ

c. 1.72Ã104âkJ

d. 417.6 kJ

e. 9.57Ã102âkJ

7.What quantity, in moles, of hydrogen is consumed when 76.8 kJ of energy is evolved from the combustion of a mixture of H2(g) and O2(g)?

H2(g) + O2(g) â2H2O(l);ÎHÂ° = â571.6 kJ

Select one:

a. 2.368 mol

b. 1.184 mol

c. 0.4223 mol

d. 0.2687 mol

e. 1.368 mol

8. Which of the following is an exothermic process?

Select one:

a. work is done by the system on the surroundings

b. heat energy flows from the system to the surroundings

c. work is done on the system by the surroundings

d. heat energy is absorbed by the system

e. none of the above

9. Which of the following statements is correct?

Select one:

a. Internal energy is not a state function.

b. The value of q is negative when heat flows into a system from the surroundings.

c. The value of q is negative in an endothermic process.

d. Heat flows from a system into the surroundings in an exothermic process.

e. Enthalpy is not a state function.

10.X2and F2react according to the following equation, forming XF. (X is an unknown diatomic element)

X2(g)+ F2(g)â2XF(g);ÎHÂ°=+271 kJ

If X2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be

Select one:

a. endothermic, and the temperature of the reaction system would fall.

b. We could not tell unless the original and final temperatures were given.

c. exothermic, and the temperature of the reaction system would fall.

d. exothermic, and the temperature of the reaction system would rise.

e. endothermic, and the temperature of the reaction system would rise.

1.) For a reaction system that is at equilibrium, which of the following must always be true?
a. q = 0 b. ?S = 0 c. ?G = 0 d. ?H = 0

2.) A certain reaction is found to be reactant favored. Which of the following is a correct description of the
reaction?
a. ?GÂ° > 0, K > 1 b. ?GÂ° > 0, K < 1 c. ?GÂ° < 0, K > 1 d. ?GÂ° < 0, K < 1

3.) What does the third law of thermodynamics state?
a. It states that a substance that is perfectly crystalline at 0 K has an entropy of zero.
b. It states that if two systems are each in thermal equilibrium with a third, they are also in thermal
equilibrium with each other.
c. It states that any quantity which has a continuous differentiable symmetry in the action has an
associated conservation law.
d. It states that the increase in internal energy of a closed system is equal to the difference between
the heat supplied to the system and the work done by the system.

CHEM 4005 Lecture Notes - Lecture 7: Exothermic Process, Thermodynamics, Buffer Solution

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