Chemistry: Matter and Change

Section 2: Heat in Chemical Reactions and Processes

Self Check Quizzes

1
The heat content of a system at constant pressure is defined as the ___________.
A)enthalpy
B)entropy
C)work
D)heat
2
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction below? ΔH° for the reaction is +624.7 kJ.

SiO2(g) + 3C(s) → SiC(s) + 2CO(g)
A)366 kJ
B)1.13 x 105 kJ
C)5.06 kJ
D)31.2 kJ
3
In the cold pack process, 27 kJ are absorbed from the environment per mole of ammonium nitrate consumed. If 50 g of ammonium nitrate are consumed, what is the total heat absorbed?

27 kJ + NH4NO3(s) → NH4+(aq) + NO3-(aq)
A)27 kJ
B)17 kJ
C)0.34 kJ
D)43 kJ
4
In the bomb calorimeter pictured, what is the function of the water?

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A)The water insulates the reaction.
B)The water prevents an explosion.
C)The water absorbs or provides energy.
D)The water provides hydrogen gas for ignition.
5
125 grams of water are placed in a foam cup. The initial temperature is 22.3 degrees Celsius. An 11.8 gram sample of metal is placed in the water at 108 degrees Celsius. The final temperature is 24.0 degrees Celsius. What is the specific heat of the metal, and what metal might the sample be?

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A)0.897, aluminum
B)1.825, beryllium
C)0.449, iron
D)1.023, magnesium
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