True or False: Humans breathe in carbon dioxide and release oxygen.

Choose 1 answer

True

False

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Which of these describes carbon dioxide? (choose all that apply)

Choose 3 answers

clear

opaque

smelly

colourless

odourless

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Which of these is the best description of a compound?

Choose 1 answer

A substance formed when two or more elements are bonded together.

A substance formed when explosions occur.

A substance formed by burning liquids.

Where a liquid changes to a solid.

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Which of these combinations makes up water?

Choose 1 answer

One hydrogen and two oxygen.

Two hydrogen and one oxygen.

One hydrogen and one oxygen.

Two hydrogen and two oxygen.

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Answer incorrect

Look at the slide below to work out the answer.