PAPER 1- WRONG QUESTIONS

Question 1

☀️ element containing a basic oxide (1 mark):

Answer 1

copper

Question 2

🧪 is iodine a solid or liquid at room temperature (1 mark)?

Answer 2

solid

Question 3

🧮 how to calculate relative atomic mass (3 marks):

Answer 3

(number of neutrons x percentage abundance) + (number of neutrons x percentage abundance) / 100

Question 4

💦 process used to obtain pure water from sugar solution (1 mark):

Answer 4

simple distillation

Question 5

explain the purpose of a condenser (2 marks):

Answer 5

1. steam is cooled
2. condenses in the condenser

Question 6

🔥 2 products of incomplete combustion (2 marks):

Answer 6

1. carbon
2. carbon monoxide

Question 7

🍃 discuss the environmental problems caused by burying polymers in landfill and burning them to release heat energy (3 marks):

Answer 7

1. landfill- will always remain
2. because they are unreactive
3. burning them releases greenhouse gases which contributes to global warming

Question 8

3 observations made when lithium reacts with water (3 marks):

Answer 8

1. effervescence
2. fast moving
3. gets smaller
4. floats

Question 9

reason to clean rod before conducting flame test (2 marks):

Answer 9

1. to remove any ions on the wire
2. which may affect the colour of the flame

Question 10

colour of flame when sodium ions are present:

Answer 10

yellow

Question 11

colour of flame when lithium ions are present:

Answer 11

red

Question 12

colour of flame when potassium ion are present:

Answer 12

purple

Question 13

colour of flame when copper ions are present:

Answer 13

green/ turquoise

Question 14

colour of flame when calcium ions are present:

Answer 14

orange- red

Question 15

ammonium gas tests (3 marks):

Answer 15

1. add sodium hydroxide solution and warm
2. test the gas with damp red litmus paper
3. will turn blue if ammonium ions are present

Question 16

sulfate ions tests (3 marks):

Answer 16

1. add dilute hydrochloric/ nitric acid
2. add barium chloride solution
3. will form a white precipitate if sulphate ions are present

Question 17

🧪 purpose of cotton wool in a flask (1 mark):

Answer 17

1. prevent acid from splashing out

Question 18

test results when using sodium hydroxide:

Answer 18

• blue- copper
• green- iron