@A glowing splint, put into oxygen gas will:
Burn brightly
Go out completely
Continue to glow

@In carbon dioxide the main types of bond are:
Covalent
Ionic
Van der Waals

@Oxygen can be prepared in the lab by:
Adding manganese IV oxide to hydrogen peroxide
Heating copper II oxide
Heating lead II carbonate

@Approximately how much of the air is composed of oxygen?
21%
78%
4%

@Oxides of non metals are usually:
Acidic
Alkaline
Neutral

@Air is passed through sodium hydroxide solution, and then over heated copper. The gases removed during this process are:
Carbon dioxide and oxygen
Oxygen and water vapour
Nitrogen and carbon dioxide

@How many oxides have a neutral pH?
A few
None at all
A very large number of them

@Roughly how much of the Earth's crust is made by oxygen (in various compounds)?
47%
5%
21%

@Oxides which are acidic and alkaine are called:
Amphoteric
Allotropes
Isotopes

@Oxygen is a diatomic gas. This means:
a molecule contains two oxygen atoms
its isotopes are radioactive
it forms oxides which can be acidic or alkaline