how to test for gases

test for chlorine

damp blue litmus paper turns white

test for oxygen

Use a glowing splint inserted into a test tube of the gas.

The splint relights in oxygen.

test for hydrogen

Use a burning splint held at the open end of a test tube of the gas.

Creates a 'squeaky pop' sound

Test for carbon dioxide

Bubble the gas through limewater

it goes cloudy.

Test for chlorine

damp blue litmus paper turns white

Explain oxidation

Gain of oxygen

reduction

loss of oxygen

Law of Conservation of Mass

Matter is neither created nor destroyed

Elements

any substance that cannot be broken down into simpler substances

Compounds

2 or more elements chemically combined