WorksheetsChemical Magic Unit – Practice Quiz English
Total questions: 13
Worksheet time: 26mins
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
Which of the following are signs that a chemical reaction is happening?
Change in color and formation of a precipitate
Increase in temperature and change in state
Emission of light and absorption of sound
Increase in mass and decrease in volume
When you mix baking soda and vinegar inside a sealed plastic bag, the bag expands because:
a chemical reaction produces gas, increasing pressure inside the bag.
the mixture creates a vacuum, causing the bag to expand.
the temperature inside the bag increases, causing expansion.
the bag material reacts with the mixture, causing it to expand.
In an experiment, Priya has three white powders: salt, baking soda, and baking powder. She mixes each with vinegar and observes that two powders bubble while one does not. What does this tell her about the powders?
Salt and baking soda bubble, baking powder does not.
Baking soda and baking powder bubble, salt does not.
Salt and baking powder bubble, baking soda does not.
All powders bubble.
