Energetics Flashcards
1
Q
What is a chemical reaction called when heat energy is taken in?
A
Endothermic.
2
Q
What are some examples of exothermic changes?
A
- The reactions of metals with acids.
- Neutralisation reactions.
- Adding water to calcium oxide.
3
Q
What does ΔH represent?
A
Molar enthalpy change.
4
Q
Is ΔH in exothermic reactions positive or negative?
A
Negative.
5
Q
Is ΔH in endothermic reactions positive or negative?
A
Positive.
6
Q
Exothermic reactions…
A
Give energy out to the surroundings - products have less energy than reactants.
7
Q
Endothermic reactions…
A
Take energy in from the surroundings - products have more energy than the reactants.
8
Q
Breaking of bonds is…
A
Endothermic - requires energy.
9
Q
Making of bonds is…
A
Exothermic - releases energy.
10
Q
What is a chemical reaction called when heat energy is given out?
A
Exothermic.
