EASY
Lower Secondary Stage 8
IMPORTANT
Earn 100
The particle diagram shows how hydrogen gas is formed in the reaction between hydrochloric acid and magnesium metal.
Use the idea of particles to explain why the pieces of magnesium get becomes smaller.
Important Questions on Chemical Reactions
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Name the salt made when calcium reacts with hydrochloric acid.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Marble statues can be damaged over time because of acid rain. Suggest why this happens.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Write a word equation for the reaction between zinc carbonate and sulphuric acid.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
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
What salt is formed when calcium reacts with sulphuric acid.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
What two reactants can be used to make the salt magnesium chloride?
MEDIUM
Lower Secondary Stage 8
IMPORTANT
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
Green copper carbonate powder was heated. The powder started bubbling and it turned black. One of the products was gas. How can you tell?
