iGCSE Flame tests, gas tests and water

Why is platinum wire used in flame tests?

• beccause it is ductile

• because it is malleable

• because it is unreactive

• because it is expensive

What colour flame does sodium give?

• lilac

• blue-green

• yellow

• red

Which reagent is used to test for the presence of water?

• anhydrous copper (II) sulfate

• hydrated copper (II) sulfate

• anhydrous copper (II) chloride

• hydrated copper (II) hydroxide

The colour of the lithium flame is:

• orange-red

• blue-green

• lilac

• red

To test for carbon dioxide, ______ the gas through lime water

The test for hydrogen gas is:

• a burning splint

• a lighted splint

• a squeaky splint

• a glowing splint

Hydrogen gas burns with a _______ pop.

The test for oxygen gas is:

• glowing splint burns with a pop

• relights a glowing splint

• relights a lighted splint

• lighted splint burns with squeaky pop

The test for ammonia is:

• turns limewater cloudy

• bleaches damp blue litmus paper white

• turns damp red litmus paper blue

• turns damp blue litmus paper red

Which gas is produced when a metal reacts with an acid?

• carbon dioxide

• oxygen

• water vapour

• hydrogen