Chemistry equations

Question 1

Avogadro’s constant

Answer 1

6.02 x 10 to the power of twenty three

Question 2

Triangle 1

Answer 2

Mass = number of moles x mass of one mole

Question 3

Triangle 2 (gas)

Answer 3

Volume= amount of moles x 24dm cubed

Question 4

Triangle 3 (concentration)

Answer 4

Moles= concentration x volume

Question 5

Percentage yield

Answer 5

Actual yield/ theoretical yield

Question 6

Percentage purity

Answer 6

Mass of pure substance/ total mass of substance

Question 7

Electrolysis?

Answer 7

Using electricity to break down ionic compounds
Anode: +
Cathode: -

Question 8

Physical changes properties

Answer 8

No new substances are formed
Easily reversible
Normally there’s a change of state

Question 9

Chemical changes properties

Answer 9

New substances are made

Not easily reversed

Question 10

Ammomiunn

Answer 10

NH+1 4

Question 11

Hydrogencarbonate

Answer 11

HCO-1 3

Question 12

Hydroxide

Answer 12

OH-1

Question 13

Nitrate

Answer 13

NO-1 3

Question 14

Sulfide

Answer 14

S-1 2

Question 15

Sulphate

Answer 15

SO-2 4

Question 16

Carbonate

Answer 16

CO-2 3

Question 17

Sulfuric acid

Answer 17

H2SO4

Question 18

Testing oxygen

Answer 18

Relight a glowing splint

Question 19

Testing hydrogen

Answer 19

Squeaky pop

Question 20

Acid + Alkali ->

Answer 20

salt + water

Question 21

Acid + carbonate ->

Answer 21

Salt + water + carbon dioxide

Question 22

Acid + insoluble base ->

Answer 22

Salt + water

Question 23

Acid + metal

Answer 23

Salt + hydrogen

Question 24

Ethanol

Answer 24

C2H2OH

Question 25

Sodium hydroxide

Answer 25

NaOH

Question 26

Nitric acid

Answer 26

HNO3

Question 27

Ammonia

Answer 27

NH3

Question 28

1 dm3 =

Answer 28

1 litre (1000cm3)

Question 29

Carbonate

Answer 29

CO3 2-