Chapter 6 Quiz 1

8/2/2019 Chapter 6 Quiz 1

1/3

Chapter 6 Quiz 1 Chem 111A SI-Mike Pearson

Question 1

An exothermic reaction causes the surrounding to:A) Become basicB) Decrease in temperatureC) CondenseD)

Increase in temperatureE) Decrease in pressure

Question 2

How much heat is evolved when 320 g of SO2 is burned according to the chemical equation

shown below?

2SO2 (g) + O2 (g) 2SO3(g) Ho= -198 kJ

A) 5.04x10-2 kJB) 990 kJC)

207 kJD) 502 kJ

E) None of the aboveQuestion 3

The specific heat of aluminum is 0.214 cal/goC. Determine the energy, in calories, necessary to

raise the temperature of a 55.5 g piece of aluminum from 23.0 to 48.6oC.

A) 109 calB) 273 calC) 577 calD) 347 calE) 304 cal

Question 4

A 60.0 g sample of an alloy was heated to 96.00oC. The temperature of the water rose to a final

temperature of 27.63oC. The specific heat of water is 4.184 J/g

oC. What is the specific heat of the

alloy?A) 0.313 J/goCB) 2.16 J/goCC) 0.118 J/goCD) 1.72 J/goCE) None of the above

Question 5

When 1.535 g of methanol (CH3OH) was burned in a constant-volume bomb calorimeter, the

water temperature rose from 20.27oC to 26.87

oC. If the mass of water surrounding the

calorimeter was exactly 1000g and the heat capacity of the bomb calorimeter was 1.75 kJ/oC,

calculate the molar heat of combustion of CH3OH. The specific heat of water is 4.184 J/goC.

A) -8.17x105 kJ/molB) -817 kJ/mol


2/3


C) 1.88 kJ/molD) 817 kJ/molE) None of the above

Question 6

Given: SO2 (g) + O2 (g)

SO3(g) H

o

= -99 kJ, what is the enthalpy change for the followingreaction?

2SO3 (g) O2 (g) +2SO2 (g)

A) 99 kJB) -99 kJC) 49.5 kJD) -198 kJE) 198 kJ

Question 7Find the standard enthalpy of formation of ethylene, C2H4 (g), given the following data:

C2H4 (g) + 3O2 (g) 2 CO2 (g) + 2 H2O (l) Ho= -1411 kJ;

C(s) +O2 (g) CO2(g) Ho= -393.5 kJ

H2 (g) + O2 (g) H2O (l) Ho= -285.8 kJ

A) 731 kJB) 2.77x103 kJC) 1.41x103 kJD) 87 kJE) 52 kJ

Question 8

Calculate Ho

rxn for the combustion reaction of CH4 shown below given the following:

Ho

f CH4 (g) = -74.8 kJ/mol

Ho

f CO2 (g) = -393.5 kJ/mol

Ho

f H2O (l) = -285.5 kJ/mol

CH4 (g) + 2O2 (g) CO2 (g) + 2H2O (l)

A) -604.2 kJB) 889.7 kJC) -997.7 kJD) -889.7 kJE) None of the above


3/3


Question 9

A 1.300 g sample of benzoic acid (C7H6O2) was burned in a bomb calorimeter. The heat capacityof the entire apparatus, including the bomb, pail, thermometer, and water, was found to be

11,145 J/K. As a result of the reactiom, the temperature of calorimeter and water increased 4.627

K. What is the molar heat of combustion of benzoic acid?

A)4.84x10

6

kJ/molB) -2.96 kJ/molC) -4844 kJ/molD) 549.1 kJ/molE) 51.57 kJ/mol

Question 10

Which of the following is incorrectly matched?

A) Radiant energy; solar energy able to influence global climate patternsB) Thermal energy; related to temperature irrespective of the volumeC) Energy; capacity to do workD)

Chemical energy; potential energy

Question 11

Energy is the ability to do work and can be:

A) Converted to one form to anotherB) Can be created and destroyedC) Used within a system without consequencesD) None of the above

Question 12

Standard enthalpy of reactions can be calculated from standard enthalpies of formation of

reactants

A) TrueB) False

Question 13

In the equation E is equal to q+w, which sign is correctly associated?A) q; - exothermicB) q; + endothermicC) w; + by system on surroundingsD) w; + on system by surroundings

Chapter 6 Quiz 1

Documents

Transcript of Chapter 6 Quiz 1