Heat Answers
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Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen?
A
The two systems must be the same temperature.B
The two systems must not be touching each another.C
One system must have higher kinetic energy than the other system.D
The thermal energy of one system must be the same as the thermal energy of the other system.2
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Which reaction is exothermic?
A
CH4 + 2O2 CO2 + 2H2O + 891 kJ
B
NH4NO3 + H2O + 25 kJ NH4+(aq) + NO3-(aq)
C
2H2O + 286 kJ 2H2 + O2
D
N2 + O2 + 181 kJ 2NO
3
An ice cube is placed on a kitchen counter. Which best describes heat flow in this situation?
A
Heat flows from the ice to the counter, causing the molecules in the counter to move more quickly.B
Heat flows from the ice to the counter, causing the molecules in the counter to move more slowly.C
Heat flows from the counter to the ice, causing the molecules in the counter to move more quickly.D
Heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.4
Iron reacts with oxygen in a chemical hand-warmer. How should this reaction be categorized?
A
as an exothermic process because it releases heatB
as an endothermic process because it releases heatC
as an exothermic process because it absorbs heatD
as an endothermic process because it absorbs heatDid you find these answers helpful?
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