1. Unit 20 Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals / Reference in textbook: Section 20.16 ST

2. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) Observations 9Record your observations.

3. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T)

4. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) Discussion 10a)Is there any gas given off when dilute sulphuric acid is added to copper? _____________________________________________________________ b) If your answer to (a) is yes, name the gas and explain your answer. _____________________________________________________________ c) Is there any gas given off when dilute sulphuric acid is added to zinc? _____________________________________________________________ No Yes

5. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) 10d)If your answer to (c) is yes, name the gas and explain your answer. ________________________________________________________________ e)Does dilute sulphuric acid act as a typical acid or an oxidizing agent in the reactions? ________________________________________________________________ Dilute sulphuric acid acts as a typical acid. Hydrogen; dilute sulphuric acid shows all the typical properties of a dilute acid; it reacts with zinc to give hydrogen.

6. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) 11a)Is there any gas given off when concentrated sulphuric acid is added to copper? ______________________________________________________________ b)If your answer to (a) is yes, name the gas and explain your answer. ______________________________________________________________ c)Is there any gas given off when concentrated sulphuric acid is added to zinc? ______________________________________________________________ Yes Sulphur dioxide; concentrated sulphuric acid oxidizes copper and produces sulphur dioxide gas. Yes

7. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) 11d)If your answer to (c) is yes, name the gas and explain your answer. _______________________________________________________________ e) Does concentrated sulphuric acid act as a typical acid or an oxidizing agent in the reactions? _______________________________________________________________ Sulphur dioxide; concentrated sulphuric acid oxidizes zinc and produces sulphur dioxide gas. Concentrated sulphuric acid acts as an oxidizing agent.

8. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) Conclusion 12Dilute sulphuric acid acts as ( a typical acid / an oxidizing agent ) when reacting with metals. 13Concentrated sulphuric acid acts as ( a typical acid / an oxidizing agent ) when reacting with metals. It is itself changed to ____________________. sulphur dioxide

9. Unit 20Oxidation and reduction Activity 20.4 Investigating the action of dilute and concentrated sulphuric acids on metals (S)/(T) Question 14Write a chemical equation for each of the following reactions.