Fire requires oxygen.

Abzymes speed up chemical reactions.

Molecules in a hot gas move more rapidly than those in a cooler gas.

Abegg’s law has to do with the number 8.

Enzymes are catalysts.

The concept of cell biology is a very ancient one.

The mass of an iron atom is much higher than that of a uranium atom.

There are only one or two kinds of atoms.

Atoms are invisible.

Water must go from solid to liquid before becoming a gas.