Essential Knowledge

Question 1

What is the formula of the following acid: hydrochloric acid

Answer 1

HCl

Question 2

What is the formula of the following acid: nitric acid

Answer 2

HNO₃

Question 3

What is the formula of the following acid: sulfuric acid

Answer 3

H₂SO₄

Question 4

What is the formula of the following base: sodium hydroxide

Answer 4

NaOH

Question 5

What is the formula of the following base: potassium hydroxide

Answer 5

KOH

Question 6

What is the formula of the following base: ammonia

Answer 6

NH₃

Question 7

What is the symbol and charge of the following cation: hydrogen

Answer 7

H+

Question 8

What is the symbol and charge of the following cation: lithium

Answer 8

Li+

Question 9

What is the symbol and charge of the following cation: sodium

Answer 9

Na+

Question 10

What is the symbol and charge of the following cation: potassium

Answer 10

K+

Question 11

What is the symbol and charge of the following cation: silver

Answer 11

Ag+

Question 12

What is the symbol and charge of the following cation: magnesium

Answer 12

Mg2+

Question 13

What is the symbol and charge of the following cation: calcium

Answer 13

Ca2+

Question 14

What is the symbol and charge of the following cation: zinc

Answer 14

Zn2+

Question 15

What is the symbol and charge of the following cation: copper

Answer 15

Cu2+

Question 16

What is the symbol and charge of the following cation: iron(II)

Answer 16

Fe2+

Question 17

What is the symbol and charge of the following cation: iron(III)

Answer 17

Fe3+

Question 18

What is the symbol and charge of the following cation: aluminium

Answer 18

Al3+

Question 19

What is the symbol and charge of the following anion: chloride

Answer 19

Cl-

Question 20

What is the symbol and charge of the following anion: bromide

Answer 20

Br-

Question 21

What is the symbol and charge of the following anion: iodide

Answer 21

I-

Question 22

What is the symbol and charge of the following anion: oxide

Answer 22

O2-

Question 23

What is the symbol and charge of the following anion: sulphide

Answer 23

S2-

Question 24

What is the symbol and charge of the following polyatomic ion: ammonium

Answer 24

NH4+

Question 25

What is the symbol and charge of the following polyatomic ion: hydroxide

Answer 25

OH-

Question 26

What is the symbol and charge of the following polyatomic ion: nitrate

Answer 26

NO₃-

Question 27

What is the symbol and charge of the following polyatomic ion: carbonate

Answer 27

CO₃2-

Question 28

What is the symbol and charge of the following polyatomic ion: sulphate

Answer 28

SO₄2-

Question 29

Write the formula for: magnesium chloride

Answer 29

MgCl₂

Question 30

Write the formula for: sodium oxide

Answer 30

Na₂O

Question 31

Write the formula for: iron (III) oxide

Answer 31

Fe₂O₃

Question 32

Write the formula for: calcium hydroxide

Answer 32

Ca(OH)₂

Question 33

Write the formula for: ammonium sulphate

Answer 33

(NH₄)₂SO₄

Question 34

Write the formula for: aluminium carbonate

Answer 34

Al₂(CO₃)₃

Question 35

How do you balance equations?

Answer 35

Using the law of conservation of mass, all the molecules on each side of an equation must have the same mass. Therefore there may be multiple molecules