paper 2 chemistry

Question 1

lithium ions give what colour flame

Answer 1

red flame

Question 2

sodium ions give what colour flame

Answer 2

yellow flame

Question 3

potassium ions give what colour flame

Answer 3

lilac flame

Question 4

calcium ions give what colour flame

Answer 4

orange - red flame

Question 5

copper ions give what colour flame

Answer 5

blue - green flame

Question 6

aluminium creates what colour precipitate

Answer 6

white at first and then colourless

Question 7

calcium creates what colour precipitate

Answer 7

white precipitate

Question 8

copper creates what colour precipitate

Answer 8

blue precipitate

Question 9

iron (II) creates what colour precipitate

Answer 9

green precipitate

Question 10

iron (III) creates what colour precipitate

Answer 10

brown precipitate

Question 11

How to test if a substance contains ammonium ions

Answer 11

Add sodium hydroxide to a mystery solution. If ammonia is given off test it by holding a piece of damp red litmus paper over it and it will turn blue. Ammonia has a strong smell.

Question 12

What colour precipitate will form from chlorides

Answer 12

white precipitate of silver chloride

Question 13

What colour precipitate will form from bromides

Answer 13

cream precipitate of silver bromide

Question 14

What colour precipitate will form from iodides

Answer 14

yellow precipitate of silver iodide

Question 15

Test for carbonates using dilute acid

Answer 15

Add some dilute acid. If carbonate ions are present the mixture will fizz - this is because the carbonate will react with the acid to produce co2 gas.

Question 16

Test for sulphate ions using barium chloride solution

Answer 16

add some dilute hydrochloric acid to test the same. then add some barium chloride. If sulphate ions are present a white precipitate of barium sulphate will form