Metal Hydroxides and Oxides

Question 1

Define an oxide

Answer 1

an atom that is bonded with an oxygen atom

Question 2

What are group 1 and 2 metal oxides

Answer 2

Bases

Question 3

What are two metal oxides?

Answer 3

Magnesium oxide and Sulfur dioxide

Question 4

What is magnesium oxide used for (MgO) ?

Answer 4

• dessicant in bags/shoes
• treating stomach acid

Question 5

Define an acid

Answer 5

contains hydrogen and dissassociates in water to form hydrogen ions (H+)

Question 6

Define a base

Answer 6

reacts with an acid to form salt + water

Question 7

Define an alkali?

Answer 7

a base that dissolves in water

Question 8

What oxides are bases?

Answer 8

Sodium oxide and calcium oxide

Question 9

What happens when the bases sodium oxide and calcium oxide dissolve in water?

Answer 9

they form metal hydroxides which are alkalis

Question 10

What is sodium hydroxide used for?

Answer 10

• drain and oven cleaner
• plastics
• soap

Question 11

What is the formula for hydrochloric acid?

Answer 11

HCl

Question 12

What is the formula for sulphuric acid?

Answer 12

H2SO4

Question 13

What is the formula for nitric acid?

Answer 13

HNO3

Question 14

What is the formula for phosphoric acid?

Answer 14

H3PO4

Question 15

What is a hydroxide?

Answer 15

An OH- ion

Question 16

What is a metal hydroxide?

Answer 16

Any metal bonded to an OH- ion
- e.g. magnesium hydroxide or sodium hydroxide

Question 17

What is calcium hydroxide used for?

Answer 17

• raise pH of acidic soil by farmers
• neutralise acidic waste from factories that produce sulfuric acid

Question 18

Define amphoteric

Answer 18

substance that can act as an acid or base
- e.g. Al2O3

Question 19

What can aluminium oxide be used as?

Answer 19

• paint
• dessicant
• sunscreen
• glass

Question 20

Aluminium oxide can react with hot HCl where it acts as a..

Answer 20

base

Question 21

Aluminium oxide can react with sodium hydroxide where it acts as an

Answer 21

acid