HARD
Lower Secondary Stage 9
IMPORTANT
Earn 100
Describe the steps you would take to make crystals of zinc sulphate from zinc granules and sulphuric acid.
Important Questions on Preparing Salts
EASY
Lower Secondary Stage 9
IMPORTANT
A salt can be made by reacting potassium carbonate solution and sulphuric acid. The carbonate solution is added drop by drop until all the acid has reacted. Name the salt produced.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
A salt can be made by reacting potassium carbonate solution and sulphuric acid. The carbonate solution is added drop by drop until all the acid has reacted. Explain why you need to use an indicator when preparing this salt.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
A salt can be made by reacting potassium carbonate solution and sulphuric acid. The carbonate solution is added drop by drop until all the acid has reacted. Explain why universal indicator would be a better choice of indicator than litmus paper.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
A salt can be made by reacting potassium carbonate solution and sulphuric acid. The carbonate solution is added drop by drop until all the acid has reacted. Explain how to prepare a pure salt solution using this method.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Joy reacts small pieces of magnesium with some sulphuric acid. She observes bubbles being made. When the fizzing stops she notices that all the magnesium has disappeared. She tests the solution with universal indicator paper, and it changes colour to orange. Which reactant was in excess? Give a reason for your answer.
HARD
Lower Secondary Stage 9
IMPORTANT
Joy reacts small pieces of magnesium with some sulphuric acid. She observes bubbles being made. When the fizzing stops she notices that all the magnesium has disappeared. She tests the solution with universal indicator paper, and it changes colour to orange. Her teacher tells joy that she must have a neutral solution otherwise her salt crystals will not be pure. Explain why and describe how she would do this.
EASY
Lower Secondary Stage 9
IMPORTANT
Jed is asked to write a balanced symbol equation for the reaction between calcium and oxygen to produce calcium oxide. This is his answer:
Explain why this is not correct.
EASY
Lower Secondary Stage 9
IMPORTANT
Jed is asked to write a balanced symbol equation for the reaction between calcium and oxygen to produce calcium oxide. This is his answer:
The above equation is not correct. Write the correct balanced symbol equation.
