Chemistry Quiz

1. Choose the correct option for the chemical formula of magnesium oxide:

• a) MgO₂

• b) Mg₂O

• c) MgO

• d) Mg(OH)₂

2. Choose the correct option for what a chemical equation represents:

• a) A mathematical formula

• b) A chemical reaction

• c) A list of elements

• d) A physical property

3. True or False:

A chemical equation must be balanced to follow the Law of Conservation of Mass.

• ✅️True

• ❌️False

4. Choose the correct option for the symbol of potassium:

• a) P

• b) K

• c) Po

• d) Pt

5. True or False:

The symbol for iron is Ir.

• ✅️True

• ❌️False

6. Choose the correct option for identifying a physical change:

• a) Rusting of iron

• b) Burning of candle

• c) Melting of ice

• d) Digestion of food

7. True or False:

Physical changes are always irreversible.

• ✅️True

• ❌️False

8. Choose the correct option for a change that is both physical and chemical:

• a) Breaking glass

• b) Boiling water

• c) Burning a candle

• d) Mixing salt in water

9. Choose the correct option for an indication of a chemical change:

• a) Change in shape

• b) Change in size

• c) Formation of gas

• d) Dissolving sugar in water

10. True or False:

Rusting of iron is a chemical change.

• ✅️True

• ❌️False