Chemistry Tests for ions etc

Question 1

Describe fluorine

Answer 1

very reactive, poisonous yellow gas

Question 2

Describe chlorine

Answer 2

fairly reactive, poisonous dense green gas

Question 3

Describe Bromine

Answer 3

dense, poisonous red-brown volatile liquid

Question 4

Describe Iodine

Answer 4

dark grey solid or purple vapour

Question 5

What colour does lithium turn the flame when burnt?

Answer 5

crimson

Question 6

What colour does sodium turn the flame when burnt?

Answer 6

yellow

Question 7

What colour does potassium turn the flame when burnt?

Answer 7

lilac

Question 8

What colour does calcium turn the flame when burnt?

Answer 8

red/brown

Question 9

What colour does Barium turn the flame when burnt?

Answer 9

Green

Question 10

Which metal causes a white precipitate which turns dissolves when mixed with sodium hydroxide?

Answer 10

aluminium

Question 11

Which metal causes a blue precipitate when mixed with sodium hydroxide?

Answer 11

copper II

Question 12

Which metal causes a green precipitate when mixed with sodium hydroxide?

Answer 12

Iron II

Question 13

Which metal causes a brown precipitate when mixed with sodium hydroxide?

Answer 13

Iron III

Question 14

How do you test for carbonates?

Answer 14

• add dilute acid then bubble collected gas through lime water, if it turns cloudy there is CO2 present

Question 15

How can you test halides?

Answer 15

add nitric acid and silver nitrate solution

Question 16

What colour precipitate does Chloride produce when mixed with nitric acid?

Answer 16

White precipiatate

Question 17

What colour precipitate does Bromide produce when mixed with nitric acid?

Answer 17

Cream Precipitate

Question 18

What colour precipitate does Iodide produce when mixed with nitric acid?

Answer 18

Yellow Precipitate

Question 19

How can you test for sulphates?

Answer 19

add barium chloride, if a white precipitate forms the original compound was a sulphate