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Chemistry - Lizzie > Energetics > Flashcards

Flashcards in Energetics Deck (10):
1

What is a chemical reaction called when heat energy is taken in?

Endothermic.

2

What are some examples of exothermic changes?

• The reactions of metals with acids.
• Neutralisation reactions.
• Adding water to calcium oxide.

3

What does ΔH represent?

Molar enthalpy change.

4

Is ΔH in exothermic reactions positive or negative?

Negative.

5

Is ΔH in endothermic reactions positive or negative?

Positive.

6

Exothermic reactions...

Give energy out to the surroundings - products have less energy than reactants.

7

Endothermic reactions...

Take energy in from the surroundings - products have more energy than the reactants.

8

Breaking of bonds is...

Endothermic - requires energy.

9

Making of bonds is...

Exothermic - releases energy.

10

What is a chemical reaction called when heat energy is given out?

Exothermic.