C4

Question 1

Why do you add excess of the insoluble reactant when making a soluble salt?

Answer 1

To make sure all the acid is used up

Question 2

When a soluble salt is formed from an acid and an insoluble base, how do you know when an excess of a base has been added?

Answer 2

When some of the reactant solid is left unreacted/undissolved

Question 3

Complete the following word equation:

Metal + Acid –>

Answer 3

Salt + hydrogen

Question 4

Which salt would be formed by reacting cobalt carbonate and hydrochloric acid?

Answer 4

Cobalt chloride

Question 5

Name the salt produced when reacting potassium hydroxide and phosphoric acid?

Answer 5

potassium phosphate

Question 6

Complete the following word equation:

Metal carbonate + acid –>

Answer 6

Salt + Water + Carbon Dioxide

Question 7

A salt is formed when nitric acid combines with sodium hydroxide. What is the name of the salt?

Answer 7

Sodium nitrate

Question 8

Which two chemicals could you react to make only potassium chloride and water?

Answer 8

Potassium hydroxide and hydrochloric acid

Question 9

What colour does the solution turn when copper oxide is added to sulfuric acid?

Answer 9

Blue