Section 2

Question 1

sodium and water

Answer 1

• melts
• fizzes
• moves around surface
• may ignite

Question 2

sodium and water equation

Answer 2

2Na + 2H2O –> 2NaOH + H2

Question 3

lithium and water

Answer 3

• floats
• meltz
• fizzes

Question 4

potassium and water

Answer 4

• burns with a lilac flame
• floats
• melts

Question 5

what happens to the elements in group 1 as their atomic number increases?

Answer 5

their reactivity increases

Question 6

chlorine state at room temp

Answer 6

gas

Question 7

chlorine colour

Answer 7

green

Question 8

bromine state at room temp

Answer 8

liquid

Question 9

bromine colour

Answer 9

red-brown

Question 10

iodine state at room temp

Answer 10

solid

Question 11

iodine colour

Answer 11

dark grey

Question 12

what is dissociation?

Answer 12

when a molecule splits up into ions

Question 13

what colour is bromine in the displacement reaction?

Answer 13

orange

Question 14

what colour is iodine in the displacement reaction?

Answer 14

brown

Question 15

what would you observe when magnesium is added to a dilute acid?

Answer 15

• vigorous reaction

- lots of bubbles

Question 16

aluminium and acid

Answer 16

• doesnt react much with cold acid
• reacts vigorously with warm acid
• produces lots of bubbles

Question 17

zinc/iron and acid

Answer 17

• slow reaction with cold acid

- strong reaction when you heat them up

Question 18

rust equation

Answer 18

iron + oxygen +water –> hydrated iron (3) oxide

Question 19

two ways to prevent rusting:

Answer 19

• painting/oiling

- galvanising

Question 20

oxygen in air

Answer 20

21%

Question 21

argon in air

Answer 21

0.9%

Question 22

nitrogen in air

Answer 22

78%

Question 23

carbon dioxide in air

Answer 23

0.04%

Question 24

how to measure the % of oxygen in the air (with iron or phosphorus)

Answer 24

• soak iron wool in ACETIC acid
• invert test tube in water
• measure the volume of water at the start and end of the experiment

Question 25

what is used to make oxygen in the lab?

Answer 25

hydrogen peroxide

Question 26

what catalyst is used to make oxygen in the lab?

Answer 26

manganese(iv) oxide

Question 27

magnesium burning in air

Answer 27

- bright white flame | - white magnesium oxide

Question 28

carbon burning in air

Answer 28

- yellowy/orange flame | - carbon dioxide gas is produced

Question 29

sulfur burning in air

Answer 29

- pale blue flame | - sulfur dioxide is produced

Question 30

what is used to make carbon dioxide in the lab?

Answer 30

- calcium carbonate | - dilute HCl

Question 31

equation for the production of carbon dioxide

Answer 31

2HCl + CaCO3 --> CaCl2 + H20 + CO2

Question 32

thermal decomposition of copper carbonate:

Answer 32

CuCO3 --> CuO + CO2

Question 33

uses for Carbon dioxide

Answer 33

- fire extinguishers | - fizzy drinks