Separating mixtures (including formulations) | Starter Quiz | Oak National Academy

In chemistry, what distinguishes a compound from an element?

• Compounds can be broken down into simpler chemicals.

• Compounds are always liquid at room temperature.

• Elements contain multiple types of atoms.

• Elements are always gases.

Answer explanation

A compound can be broken down into simpler substances (elements) through chemical reactions, unlike elements.

Order the states of matter from most to least freedom of movement:

• gas

• liquid

• solid

Answer explanation

From most to least freedom of movement: gas, liquid, solid. Gas particles move freely, while solid particles are tightly packed.

Which is only a characteristic of a chemical change (compared to a physical change)?

• change in state

• increase in temperature

• formation of a new substance

• change in mass

Answer explanation

A chemical change involves the formation of a new substance. Both physical and chemical changes can lead to a change in state or temperature. Mass is always conserved.

What defines an element in chemistry?

• a mixture of compounds

• a substance with varying properties

• a substance made of one type of atom

• any solid material

Answer explanation

An element is a substance made of only one type of atom, distinguishing it from compounds or mixtures.

What property measures how much matter is in a substance?

Answer explanation

Mass measures the amount of matter in a substance, reflecting how much 'stuff' it contains.

In chemistry, ___ chemicals refer to substances that only contain one type of fundamental unit, like an atom or molecule.

Answer explanation

A 'pure' substance consists of a single type of particle, which means it's not a mixture of different elements or compounds.