MEDIUM
Lower Secondary Stage 9
IMPORTANT
Earn 100

Is condensation an exothermic or endothermic process? Explain your answer. 

Important Questions on Energy Transfers in Chemistry

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 3
Which one of the following statements is true? During an exothermic reaction:
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 4
Which one of the following statements is true? During an endothermic reaction:
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 5
Name the process that occurs when the fast moving particles in a liquid escape from its surface.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 6

When the fuels are burnt in oxygen, it is called combustion. Copy and complete this word equation for the combustion of a hydrocarbon:

Hydrocarbon + Oxygen → _____ + _____

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 6
When the fuels are burnt in oxygen, it is called combustion. Combustion reaction transfer energy to the surroundings as heat. Is this an endothermic or exothermic reaction?
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 7

Which of these processes are endothermic?

a. Ice melting     b. Firework exploding     c. Steam condensing     d. Burning gas on a stove     e. Photosynthesis     f. Evaporation of water

HARD
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 8
When you exercise, your body sweats to cool you down. Explain how this works.
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>End of Chapter Review>Q 9

Instant cold packs can be made using ammonium nitrate and water. The pack contains a small bag of solid ammonium nitrate. This bag is inside another bag, which is full of water. When you squeeze the outer bag the smaller bag bursts. The ammonium nitrate dissolves in water and the pack becomes cold. 

Is this an endothermic process or exothermic process?