Chem 9.1 Energy changes in chemical reactions Flashcards
1
Q
What is an exothermic reaction?
A
A reaction that releases heat & an increase in temperature (+ temp. change).
2
Q
What are examples of exothermic reactions?
A
Burning reactions (combustion of fuels)
Detonation of explosives
Reaction of metals with acids
Most neutralization reactions
3
Q
What is an endothermic reaction?
A
A reaction that takes in heat & a decrease in temperature (- temp. change).
4
Q
What are examples of exothermic reactions?
A
Melting
Evaporation + Boiling
Some salts dissolving in water
5
Q
If heat is given out (exothermic), then where does that energy come from?
A
From chemical energy
6
Q
If extra energy is needed (endothermic), then where does that energy come from?
A
From thermal energy.
