Chapter 5 Thermochemistry

Question 1

What is thermochemistry?

Answer 1

The study of heat changes when chemical reactions occur

Question 2

How to instant hot packs work?

Answer 2

Releases heat into surroundings
Relieve muscle cramps, increases size of lumen in the blood capillaries to increase rate of blood circulation

Question 3

How do instant cold packs work?

Answer 3

Absorbs heat from surroundings
Reduce the swelling of wounds, get rid of heat from inflamed tissues

Question 4

What is an exothermic reaction?

Answer 4

Releases heat into the surroundings

Question 5

What is an endothermic reaction?

Answer 5

Absorbs heat from the surroundings

Question 6

Examples of an exothermic reaction?

Answer 6

Burning, Bomb, Neutralisation reaction, explosion

Question 7

Examples of an endothermic reaction

Answer 7

Photosynthesis, cake baking, extraction of iron, dissolving ammonium salt in water