Grade 3 · Science · Unit 2 of 15
Materials & Changes
Natural and processed materials, and changes that can or cannot be undone.
What your child practises
Natural and processed materials, and the difference between reversible and permanent changes.
Alberta Curriculum learning outcome: 3M1.1, 3M1.6 · natural and processed materials, and reversible and permanent changes
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
Why can an old plastic bottle be recycled into a new product?
♻️- bottles turn into trees
- plastic grows back
- it becomes a natural material
- processed materials can sometimes be changed again
Show answer
processed materials can sometimes be changed again
Hint: Recycling can give materials a new use.
Question 2
Which material comes from sand?
🪟- wood
- paper
- wool
- glass
Show answer
glass
Hint: Sand is heated to make glass.
Question 3
Rusting turns a shiny nail into reddish flakes. This is a…
🔩- reversible change
- state change to a gas
- permanent change
- freezing
Show answer
permanent change
Hint: Rust is a new material and the nail will not go back.
Question 4
A piece of wood turns to ashes in a fire. What kind of change is it?
🔥- reversible
- melting
- freezing
- permanent
Show answer
permanent
Hint: You cannot turn ashes back into wood.
Question 5
Which material is processed from oil?
🧴- wool
- clay
- plastic
- stone
Show answer
plastic
Hint: Many plastics are made from oil.
Question 6
Natural material or processed material? Tap an item, then tap its basket.
Sort into: 🌳 natural · 🏭 processed
- 🪵wood from a tree
- 🥛glass
- 🐑wool from a sheep
- 🏠bricks
- 🪨stone
- 🧴plastic
Show answer
🌳 natural: wood from a tree, wool from a sheep, stone · 🏭 processed: glass, bricks, plastic
Hint: Natural materials come from nature as they are. Processed materials are made from natural ones and changed by people.