End of Second Term Assessment

The diagram shows particles of a substance in the solid, liquid, and gas states.

Choose the letter of the box that shows particles of a substance in the solid state

• A

• B

• C

The diagram shows particles of a substance in the solid, liquid, and gas states.

Choose the state in which particles can be compressed

• A

• B

• C

A bottle in the laboratory containing a solution has this hazard symbol.

Choose the correct meaning of the hazard symbol from the list below

• flammable

• toxic

• dangerous to the environment

• corrosive

Write down One safety precautions you must take when using a corrosive solution in the bottle.

A substance that cannot be broken down into other substances is called ___.

• one

• an element

• a compound

• more than one

An element has _____ type of atom.

• one

• an element

• a compound

• more than one

A compound is a substance that is made up of ________type of atom.

• one

• an element

• a compound

• more than one

Every element has its own chemical symbol, and every compound has a formula.

Choose the correct chemical symbol for the element magnesium

• MG

• Mg

• mg

• mG

A molecule of sulfur dioxide is made up of one atom of sulfur joined to two atoms

of oxygen.

The chemical symbol for sulfur is S.

The chemical symbol for oxygen is O.

Choose the correct formula of sulfur dioxide

• S₂O

• S₂O₂

• SO₂

• 2SO

Each box shows the particles of one substance.

Each circle represents one atom.

Circles with different shading represent atoms of different elements.

Circles with the same shading represent atoms of the same element.

Choose the letters of two boxes that contain elements

• A

• B

• C

• D