KS3 - Does Chemistry Matter - Quiz

What is the definition of an element?

• A pure substance that cannot be broken down

• A mixture of different substances

• A compound with multiple components

• A solution of chemicals

An atom is best described as:

• The smallest unit of matter

• A liquid substance

• A type of chemical reaction

• A complex molecule

Where are metals located on the periodic table?

• On the right side

• On the left side

• In the middle

• Scattered randomly

A compound is:

• A mixture of substances

• A pure substance formed by chemically combining elements

• A single element

• A physical blend of materials

Which of the following is a characteristic of a mixture?

• Chemically bonded components

• Fixed composition

• Components can be separated physically

• Irreversible combination

A compound formed from a metal and non-metal typically has its name:

• Kept exactly the same

• Changed with a prefix

• Changed to end with 'ide'

• Randomly assigned

Atoms in a molecule are:

• Floating freely

• Held together by bonds

• Completely separate

• Always moving apart

What is air primarily considered?

• A pure substance

• A compound

• A mixture of gases

• A single element

What indicates a chemical reaction has occurred?

• Temperature remains constant

• No visible changes

• Color change, bubble formation, temperature change

• Objects remain unchanged

Reactants in a chemical reaction are:

• The final products

• Substances that react together

• Unused chemicals

• Observations of the reaction