chemical equations

Question 1

calcium + chlorine

Answer 1

Calcium chloride

Question 2

magnesium + oxygen

Answer 2

Magnesium oxide

Question 3

silver + sulfur + oxygen

Answer 3

silver sulphate

Question 4

mon

Answer 4

one

Question 5

di

Answer 5

two

Question 6

tri

Answer 6

three

Question 7

CO

Answer 7

carbon monoxide

Question 8

CO2

Answer 8

Carbon dioxide

Question 9

SO3

Answer 9

sulphur trioxide

Question 10

HCI

Answer 10

hydrochloric acid

Question 11

what is H2SO4

Answer 11

sulfuric acid

Question 12

NH3

Answer 12

Ammonia

Question 13

H2O

Answer 13

water

Question 14

what is CH3CH2OH

Answer 14

Ethanol

Question 15

CH4

Answer 15

Methane

Question 16

starting chemicals

Answer 16

reactants

Question 17

Chemicals you make

Answer 17

Products

Question 18

(s)

Answer 18

Solid

Question 19

(l)

Answer 19

liquid

Question 20

(g)

Answer 20

gas

Question 21

(aq)

Answer 21

solution

Question 22

2Cu + O2 —-> 2 CuO

Answer 22

copper + oxygen ———> copper oxide

Question 23

N2 + 3H2 —-> 2NH3

Answer 23

Nitrogen + hydrogen ——–> ammonia

Question 24

Precipitation reactions

Answer 24

occur when a solid is produced from two solutions which are mixed together

Question 25

how many atoms in H2O

Answer 25

2 x hydrogen
1 x oxygen

Question 26

Mg(OH)2

Answer 26

magnesium x 1
oxygen x 2
hydrogen x 2

Question 27

number of elements : (NH4)2SO4

Answer 27

nitrogen = 2
hydrogen = 8
sulfur = 1
oxygen = 4

Question 28

total mass of products

Answer 28

equals the total mass of reactants

Question 29

law of conversion of mass

Answer 29

total mass of products equals the total mass of reactants