Thermochemistry: Question Preview (ID: 1587)

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Which quantities must be conserved in a balanced chemical reaction?
a) Energy
b) Mass
c) Charge
d) All of the above

What is the specific heat capacity of an object that has a mass of 400 g, and is raised 27 degrees Celsius by 4500 Joules of energy?
a) 0.712 J/gC
b) 0.417 J/gC
c) 0.568 J/gC
d) 0.961 J/gC

How much energy is required to melt 92g of a substance whose heat of fusion is 0.84 J/g?
a) 75.0 J
b) 77.3 J
c) 80.4 J
d) 74.6 J

To find the heat of reaction, what information is required?
a) mass of products and reactants
b) heats of formation of products and reactants
c) specific heat capacities of products and reactants
d) all of the above

What is the heat of reaction for the following reaction? 2C2H6(g) + O2(g) --> 4CO2(g) + 6H2O(g)
a) 745.8 cal
b) -745.8 cal
c) 826.6 cal
d) -826.6 cal

What is the standard heat of formation for any element in its elemental form?
a) Depends on the element
b) Zero
c) Negative
d) 42 J

In the case of dissolution, which of the following is considered the environment?
a) The water
b) The salt
c) The room
d) The container

How many joules are in 745.3 calories?
a) 3254.0
b) 3115.4
c) 3367.0
d) 3576.4

How much energy, in calories, are required to convert 84 g of ice to water at standard conditions?
a) 6712 cal
b) 117274 cal
c) 8458 cal
d) 12985 cal

Heat generally flows in which direction?
a) High temperature to low temperature
b) Low temperature to high temperature
c) Heat does not flow
d) Away

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