Key terms

Define atom

The smallest part of a substance that cannot be broken down chemically

What are atoms made of?

Proteins, neutrons, electrons

Define molecule

A collection of atoms bonded together chemically with covalent or ionic bonds

Define compound

Made from atoms of two or more elements and can include metals and non-metals or simply non-metals

Define ion

Can be positively charged (having lost an electron leading to an overall positive charge) or negatively charged (having gained an electron leading to an overall negative charge)

Define non-polar

When the ions within a molecule have charge but the overall molecule is not charged

Define polar

When the ions within a molecule are all charged and the molecule has an overall charge

Define pure

They cannot be broken down into smaller parts without chemical or nuclear reactions taking place

Define mixture

A substance which is not pure, is not chemically bonded so can be divided by physical means

In what liquid do non-polar compounds dissolve?

Not water, in lipids (they are lipid soluble)

What type of particle do charged particles attract?

Oppositely charged particles as they have important roles within the structure of lipids (covalent or hydrogen bonds)