MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

Plan a way of collecting evidence to prove that carbon dioxide is made when carbon burns.

Important Questions on Chemical Reactions

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 11>Q 3
When you burn a candle, substances in the wax react with oxygen in the air to produce the products carbon dioxide and water vapour. Explain why a candle gets smaller as it burns.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 1
What salt is formed when calcium reacts with sulphuric acid.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 2
Iron is added to a solution of copper chloride. Copper and iron chloride are formed. Write the word equation for this reaction.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 3
What two reactants can be used to make the salt magnesium chloride?
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 4
Write the word equation for the reaction when zinc is heated in oxygen.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 5
What gas is formed when acid reacts with metals?
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 6

Green copper carbonate powder was heated. The powder started bubbling and it turned black.

State two signs that a chemical reaction took place.

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 6
Green copper carbonate powder was heated. The powder started bubbling and it turned black. One of the products was gas. How can you tell?