1.1 Formulae and Equations

Question 1

The formulae for this common compound: Water

Answer 1

H ₂ O

Question 2

The formulae for this common compound: Sulphur dioxide

Answer 2

SO₂

Question 3

The formulae for this common compound: Methane

Answer 3

CH₄

Question 4

The formulae for this common compound: Ammonia

Answer 4

NH₃

Question 5

The formulae for this common compound: Sodium hydroxide

Answer 5

NaOH

Question 6

The formulae for this common compound: Sodium carbonate

Answer 6

NaCO₃

Question 7

The formulae for this common compound: Copper(II) sulphate

Answer 7

CuSO₄

Question 8

The formulae for this common compound: Nitric acid

Answer 8

HNO₃

Question 9

The formulae for this common compound: Ethanoic acid

Answer 9

CH₃COOH

Question 10

The formulae for this common compound: Copper(II) oxide

Answer 10

CuO

Question 11

The Formulae for this common ion: Ammonium

Answer 11

NH₄⁺

Question 12

The Formulae for this common ion: Lithium

Answer 12

Li⁺

Question 13

The Formulae for this common ion: Magnesium

Answer 13

Mg²⁺

Question 14

The Formulae for this common ion: Copper(II)

Answer 14

Cu²⁺

Question 15

The Formulae for this common ion: Iron(III)

Answer 15

Fe³⁺

Question 16

The Formulae for this common ion: Aluminium

Answer 16

Al³⁺

Question 17

The Formulae for this common ion: Fluoride

Answer 17

F^-

Question 18

The Formulae for this common ion: Hydrogen carbonate

Answer 18

HCO₃^-1

Question 19

The Formulae for this common ion: Hydroxide

Answer 19

OH^-

Question 20

The Formulae for this common ion: Sulphate

Answer 20

SO₄^2-

Question 21

The oxidation number of group one metals is always …

Answer 21

+1

Question 22

The oxidation number of group two metals is always …

Answer 22

+2

Question 23

All group seven ions have … ions

Answer 23

1- negative

Question 24

Oxidation number

Answer 24

is the number of electrons that need to be added or taken away from an element to make it neutral

Question 25

The oxidation number of an uncombined element is always …

Answer 25

Zero

Question 26

The sum of the oxidation numbers in a compound is always …

Answer 26

Zero

Question 27

The sum of oxidation numbers in an ion is always …

Answer 27

Equal to the overall charge of the ion

Question 28

The oxidation number of oxygen is always -2 except in compounds with …

Answer 28

Fluorine

Question 29

The oxidation number of hydrogen is always +1 in compounds, except for in …

Answer 29

Metal hydrides

Question 30

Oxidation numbers are used in … reactions

Answer 30

redox