Chemical Magic Unit – Practice Quiz English

What is ALWAYS true about matter?

• It is invisible and has no weight.

• It takes up space and has mass.

• It can only exist in solid form.

• It disappears when it dissolves.

Which of the following is an example of a chemical change?

• Ice melting into water

• Sugar dissolving in lemonade

• A penny turning shiny after being soaked in vinegar and salt

• Breaking a piece of chocolate in half

If you mix 250g of water with 50g of sugar, what will be the total mass?

• 200g

• 250g

• 300g

• 500g

What will happen if you mix baking soda with vinegar?

• Nothing will happen.

• It will form bubbles and foam due to a chemical reaction.

• The baking soda will dissolve completely.

• The mixture will turn into a solid.

When a substance dissolves in water, what happens to its particles?

• The particles break down and disappear.

• The particles spread out evenly in the water but still exist.

• The particles turn into gas.

• The water particles change into a solid.

A gas is always produced when two substances are mixed.

• True

• False

Freezing a liquid changes its mass.

• True

• False

The total weight of substances remains the same before and after a chemical reaction in a closed system.

• True

• False

When baking soda and vinegar react, gas is produced, which can inflate a balloon.

• True

• False

When a solid turns into a liquid, its particles move faster and spread out.

• True

• False