2nd grade · Science · Unit 4 of 9
Mixtures & Materials
Dissolve, sink, float, absorb
What your child practices
Mixing liquids and solids (dissolving, separating), what sinks or floats, and which materials soak up or push away water.
Oregon State Standards learning standard: 2.PS1.1; 2.PS1.2 · testing materials' properties and choosing the best one for a job
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
Which one is a liquid?
- 🥛milk
- 🪵a block of wood
- 🧱a brick
🥛 milk
Hint: Liquids flow and can be poured.
Question 2
Sugar is stirred into warm water. What happens?
🍬- It turns into ice
- It floats on top forever
- It dissolves into the water
It dissolves into the water
Hint: Dissolving means the sugar mixes in so we cannot see the pieces.
Question 3
When oil and water are mixed, what happens?
- They become one smooth liquid
- They stay separate
- They turn solid
They stay separate
Hint: Oil floats on top of water.
Question 4
Which will float in water?
- 🪵a wooden stick
- 🪙a coin
- 🪨a rock
🪵 a wooden stick
Hint: Wood is less dense than water, so it floats.
Question 5
Which will sink in water?
- 🥄a wooden spoon
- 🍃a leaf
- 🔑a metal key
🔑 a metal key
Hint: A key is heavy for its size, so it sinks.
Question 6
When you stir cocoa powder into milk, you make…
- a new animal
- a rock
- a mixture
a mixture
Hint: Cocoa and milk are combined, so it is a mixture.