chapt 13 (chemical energetics)

Question 1

Endothermic reactions (2) + examples [chemical (2), physical (4)]

Answer 1

• Absorption of energy from surrounding
• Temp of surrounding dec

Chemical:
1. Thermal decomposition
2. Photosynthesis

Physical:
1. Boiling
2. Melting
3. Sublimation
4. Dissolution of ionic compounds

Question 2

Exothermic (2) + examples [chemical (3) + physical (3)]

Answer 2

• Release energy into surroundings
• Temp of surroundings inc

Chemical:
1. Combustion
2. Neutralisation
3. Respiration

Physical:
1. Freezing
2. Condensation
3. Dissolution of acids and alkalis in water