5.4.2.1 Reactions of Acids with Metals

Question 1

What happens when an acid reacts with some metals?

Answer 1

• salts
• hydrogen

Question 2

What is the reaction between an acid and some metals?

Answer 2

• redox reactions

Question 3

What is a redox reaction?

Answer 3

• one substance is reduced
• another substance is oxidised

Question 4

How can you identify which substances are oxidised/reduced?

Answer 4

• based on how many electrons gained or lost

Question 5

What is an example of a redox reaction?

Answer 5

• 2HCl + Mg -> MgCl2
  + H

Question 6

How does the example redox reaction show that magnesium has been oxidised?

Answer 6

• Mg -> Mg2+ so the ionic equation is Mg -> Mg2+ + 2e-
• lost electrons

Question 7

How does the example redox reaction show that hydrogen has been reduced?

Answer 7

• 2H+ -> H2 so the ionic equation is 2H+ + 2e- -> H2
• gained electrons