Equations

Question 1

Which ions are in NaCl

Answer 1

Na⁺ and Cl⁻

Question 2

Which ions are in CaCO₃

Answer 2

Ca²⁺ and CO₃²⁻

Question 3

Which ions are in Mg(OH)₂

Answer 3

Mg²⁺ and 2 ions of OH⁻

Question 4

Which ions are in H₂SO₄

Answer 4

2 ions of H⁺ and one SO₄²⁻

Question 5

Which ions are in NH₄OH

Answer 5

NH₄⁺ and OH⁻

Question 6

Which ions are in (NH₄)₂O

Answer 6

2 ions of NH₄⁺ and one O²⁻

Question 7

What is the formula of calcium chloride?

Answer 7

CaCl₂

Question 8

What is the formula of aluminium nitrate?

Answer 8

Al(NO₃)₃

Question 9

What is the formula of iron (III) oxide?

Answer 9

Fe₂O₃

Question 10

What is the formula of magnesium fluoride?

Answer 10

MgF₂

Question 11

What is the formula of sodium sulphate?

Answer 11

Na₂SO₄

Question 12

What is the formula of copper (I) oxide

Answer 12

Cu₂O

Question 13

Is this process oxidation or reduction? Al → Al³⁺ + 3e⁻

Answer 13

Oxidation

Question 14

Is this process oxidation or reduction? Na⁺ + e⁻ → Na

Answer 14

Reduction

Question 15

Is this process oxidation or reduction? F₂ + 2e⁻ → 2F⁻

Answer 15

Reduction

Question 16

Is this process oxidation or reduction? Fe²⁺ → Fe³⁺ + e⁻

Answer 16

Oxidation

Question 17

Balance this ionic equation: Ca + Na⁺ → Ca²⁺ + Na

Answer 17

Ca + 2Na⁺ → Ca²⁺ + 2Na

Question 18

Balance this ionic equation: Mg²⁺ + Na → Na⁺ + Mg

Answer 18

Mg²⁺ + 2Na → 2Na⁺ + Mg

Question 19

Balance this ionic equation: Al + Ca²⁺ → Al³⁺ + Ca

Answer 19

2Al + 3Ca²⁺ →2Al³⁺ + 3Ca

Question 20

In this reaction, what has been oxidised and what has been reduced? Mg²⁺ + 2Na → 2Na⁺ + Mg

Answer 20

Na has been oxidised, Mg²⁺ has been reduced

Question 21

In this reaction, what has been oxidised and what has been reduced? 2Al + 3Ca²⁺ → 2Al³⁺ + 3Ca

Answer 21

Al has been oxidised, Ca²⁺ has been reduced

Question 22

In this reaction, what has been oxidised and what has been reduced? K + Na⁺ → K⁺ + Na

Answer 22

K has been oxidized, Na⁺ has been reduced