Which is only a physical change?

A chemical change always

Food cooks faster at higher temperature. This is because, as the temperature increases, the rate of a chemical reaction usually

A molecule of carbon dioxide (CO2) is made of one atom of carbon and two atoms of oxygen.

Which subatomic particles are found in the nucleus of an atom?

Atoms in a molecule are joined together by

Which of the following substances is NOT an element?

Hydrogen is not longer used in balloons because it is too

A mixture that can be separated with a magnet is

Which of the following substances an example of a compound?

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