5th grade materials and their properties

Question 1

A burning candle on a balance gets lighter. Has matter been destroyed?

• A. No, the balance is broken.
• B. Yes, the flame eats the wax.
• C. Yes, burning destroys matter.
• D. No, the wax has turned into gases that escaped into the air.

Question 2

Vinegar and bicarbonate of soda (baking soda) react in an open beaker. The mass falls from 209 g to 206.8 g. What mass of gas escaped, in g?

Answer g

Question 3

In a sealed flask, 21 g of one chemical reacts with 46 g of another. What is the total mass of the products, in g?

Answer g

Question 4

120 g of water is frozen in a sealed tub. What is the mass of the ice, in g?

Answer g

Question 5

Which change is reversible?

• A. an iron nail rusting
• B. melting chocolate
• C. baking a cake
• D. burning wood

Question 6

What is the best way to separate pebbles and sand?

• A. sieving
• B. evaporating
• C. filtering
• D. using a magnet

Question 7

Which change makes sugar dissolve faster?

• A. leaving it still
• B. using warmer water and stirring
• C. using colder water
• D. using bigger sugar lumps

Question 8

Separating mixtures: which statement is NOT true?

• A. A magnet can pull salt out of a mixture.
• B. Evaporation can get a dissolved solid back from a solution.
• C. Filtering can separate an insoluble solid from a liquid.
• D. Distillation can get pure water from salt water.

Question 9

You have two white powders: salt and chalk. Which test tells them apart safely?

• A. Taste them.
• B. Smell them closely.
• C. Stir each into water: salt dissolves, chalk does not.
• D. Look at their colour.

Question 10

Granulated sugar dissolves faster than a sugar cube of the same mass. Why?

• A. Water dislikes cubes.
• B. Smaller pieces have more surface touching the water.
• C. Cubes are heavier.
• D. Granulated sugar is a different substance.

Question 11

Is bath salts soluble or insoluble in water?

• A. soluble (dissolves in water)
• B. insoluble (does not dissolve)

Question 12

Is this a solution or a mixture that is not a solution: sugar in hot tea?

• A. solution
• B. mixture that is not a solution

Question 13

Is this change reversible or irreversible: cooking an egg?

• A. reversible
• B. irreversible

Question 14

In some dry countries, drinking water is made from seawater. Which process gets fresh water out?

• A. evaporating the water and condensing it again (distillation)
• B. sieving the sea
• C. freezing the salt out with a fan
• D. using a magnet

Question 15

A mystery material is a white powder that fizzes when vinegar is added. What is it most likely to be?

• A. baking soda
• B. salt
• C. glass
• D. aluminium (aluminum)