Unknown Substance Lesson

pure substances:elements and compounds
grade 10

a substance made up of only one type of atom.
e.g. hydrogen

element

times.

​substance made up of different elements joined together by a chemical bond.
e.g. water

compound

substance made up of one kind of particle.
e.g. elements
compounds( contains only one type of molecule)

​

pure substances

Multiple Choice

How can William determine if a substance is pure?

• By subjecting it to extreme temperatures to test its purity

• By exposing it to a contaminated environment to observe its reaction

• By ensuring the substance consists of only one type of atom or molecule, with no impurities or other substances mixed in.

• By mixing it with other substances to enhance its properties

Multiple Choice

Which element is known as the 'breath of life'?

• helium

• oxygen

• nitrogen

• carbon

Multiple Choice

Oliver, Henry, and Mason are on a quest to define a compound. Can you help them out?

• A compound is a substance formed when two or more chemical elements are chemically bonded together.

• A compound is a type of physical change

• A compound is a substance formed by a single chemical element

• A compound is a mixture of two or more elements

Multiple Choice

Explain the difference between an element and a compound.

• An element is a mixture of different types of atoms, whereas a compound is made up of only one type of atom.

• An element is always a liquid, while a compound is always a gas.

• An element and a compound are the same thing.

• An element consists of only one type of atom, whereas a compound consists of two or more different types of atoms bonded together.

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