Topic 9

Question 1

Why is the test for any ion unique?

Answer 1

The results of a test must let you determine which ion is present, rather than being uncertain about which ion it is.

Question 2

Flame test for lithium, Li (in solid ions)

Answer 2

Red flame

Question 3

Flame test for Sodium, Na (in solid ions)

Answer 3

Yellow flame

Question 4

Flame test for Potassium, K (in solid ions)

Answer 4

Lilac flame

Question 5

Flame test for Calcium, Ca (in solid ions)

Answer 5

Orange / red flame

Question 6

Flame test for Copper, Cu (in solid ions)

Answer 6

Green / blue flame

Question 7

Test for Aluminium, Al using sodium hydroxide solution

Question 8

Test for Calcium, Ca using sodium hydroxide solution

Question 9

Test for Copper, Cu using sodium hydroxide solution

Question 10

Test for Iron (II), Fe using sodium hydroxide solution

Question 11

Test for Iron (III), Fe using sodium hydroxide solution

Question 12

Test for Ammonium, NH4 using sodium hydroxide solution

Question 13

Describe the chemical test for Ammonia

Question 14

Test for carbonate ion, CO3 using dilute acid and identifying the carbon dioxide evolved

Question 15

Test for sulfate ion, SO4 using dilute hydrochloric acid and barium chloride solution

Question 16

Test for chloride ion, Cl, bromide ion, Br, iodide ion, I, using dilute nitric acid and silver nitrate solution

Question 17

Recall the formulae of molecules of methane

Question 18

Recall the formulae of molecules of ethane

Question 19

Recall the formulae of molecules of propane

Question 20

Recall the formulae of molecules of butane

Question 21

Why are alkanes saturated hydrocarbons?

Question 22

Recall the formulae of molecules of methene

Question 23

Recall the formulae of molecules of ethene

Question 24

Recall the formulae of molecules of propene

Question 25

Recall the formulae of molecules of butene

Question 26

Why are alkenes unsaturated hydrocarbons?

Question 27

How is bromine water used to distinguish between alkanes and alkenes?