# Thermodynamics Section 2 Quiz

10 Questions | Total Attempts: 494  Settings  Quiz

• 1.
Thermodynamic reactions play important roles in all of the following except...
• A.

Car engines

• B.

Refrigerators

• C.

Hitting baseballs

• D.

Cooking food

• 2.
What is a calorimeter?
• A.

A unit of calories per meter.

• B.

An insulated device used to measure the amount of heat absorbed or released during a chemical or physical process.

• C.

The amount of heat required to raise the temperature of one gram of pure water by one degree Celsius.

• D.

All of the above.

• 3.
What is the formula for measuring quantity of heat?
• A.

Q = c × m × ∆T

• B.

∆H rxn = H final - H initial

• C.

PV = nRT

• D.

F = ma

• 4.
Chemical reactions and physical changes that absorb energy from their surroundings are __________.
• A.

Isothermic

• B.

Exothermic

• C.

Endothermic

• D.

Mesothermic

• 5.
The universe is defined as the system plus the surroundings. universe = system + surroundings
• A.

True

• B.

False

• 6.
The heat content of a system at constant pressure is defined as the ___________.
• A.

Entropy

• B.

Heat

• C.

Work

• D.

Enthalpy

• 7.
What kind of energy transfers occurs during the heat-pack reaction?
• A.

Heat from the reaction flows from the heat pack (system) to the cold hands (surroundings)

• B.

Heat from the reaction flows from the heat pack (surroundings) to the cold hands (system)

• C.

Heat from the reaction flows from the cold hands (surroundings) into the heat pack (system)

• D.

None of the above

• 8.
For the reaction below, the enthalpy change is +624.7 kJ. How would you classify this reaction? SiO2(g) + 3C(s) → SiC(s) + 2CO(g)
• A.

Endothermic reaction, heat is gained by the system

• B.

Exothermic reaction, heat is lost from the system

• C.

Endothermic reaction, heat is lost from the system

• D.

Exothermic reaction, heat is gained by the system

• 9.
Enthalpy changes for exothermic reactions are always positive.
• A.

True

• B.

False

• 10.
A 75.0-g sample of a metal is place in boiling water until its temperature is 100.0°C. A calorimeter contains 100.00 g of water at a temperature of 24.4°C. The metal sample is removed from the boiling water and immediately placed in water in the calorimeter. The final temperature of the metal and water in the calorimeter is 34.9°C. Assuming that the calorimeter provides perfect insulation, what is the specific heat of the metal?
• A.

0.900 J/(g •°C)

• B.

0.900 J

• C.

1.11 J/(g •°C)

• D.

1.68 J

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