Chapter 4 - Acids and Redox

Question 1

What is an acid?

Answer 1

H+ donor

Question 2

What is a weak acid?

Answer 2

only releases a small proportion of its available hydrogen atoms.

partially dissociates/ionises

Question 3

What is a strong acid?

Answer 3

Completely dissociates

Question 4

What is reduction?

Answer 4

• gain of electrons

* decrease in oxidation number

Question 5

What is oxidation?

Answer 5

• loss of electrons

* increase in oxidation number

Question 6

What are reducing agents?

Answer 6

Reducing agents lose electrons and are oxidised themselves.

Question 7

What are oxidising agents?

Answer 7

Oxidising agents gain electrons and are reduced themselves.

Question 8

What can neutralise acids?

Answer 8

Alkalis or bases

Question 9

Hydrochloric acid

Answer 9

HCl

Question 10

Sulfuric acid

Answer 10

H₂SO₄

Question 11

Nitric acid

Answer 11

HNO₃

Question 12

Ethanoic Acid

Answer 12

CH₃COOH

Question 13

Metal + Acid = ?

Answer 13

Salt + Hydrogen

Question 14

Metal Oxide =
and
Metal Hydroxide(alkali) =

Answer 14

Salt and water

Question 15

Metal carbonate + acid =

Answer 15

Salt + Carbon dioxide + water

Question 16

Thinking about what ions form when they dissolve in water, why does mixing an acid and an alkali create a neutral substance?

Answer 16

• Acids form H+ ions when they dissolve in water
• Alkalis form OH- ions when they dissolve in water.
• H+ and OH- ions combine to form water
• Water is a neutral substance

Question 17

What is a base

Answer 17

A H+ acceptor