MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

Name the salt made when calcium reacts with hydrochloric acid.

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 8>Q 6
Marble statues can be damaged over time because of acid rain. Suggest why this happens.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 9>Q 7
Write a word equation for the reaction between zinc carbonate and sulphuric acid.
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.
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?
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? 
HARD
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>End of chapter review>Q 7
A piece of magnesium with a mass of 2.4 g was heated in air to form magnesium oxide with a mass of 4.0 g. Calculate the mass of oxygen that reacted with the magnesium.