Year 4 Science Solids, liquids and gases: check-up and practice test questions

Method. Think about which one keeps its shape.

1. Look at each one. Wood keeps its shape. Milk flows, and air spreads out.
   keeps its shape
2. Write the answer.
   wood

Check. Solids keep their shape. ✓

Method. Read the key idea in section 6.2.

1. Read the key idea. A liquid takes the shape of its container.
   takes the shape
2. Write the answer.
   no

Check. Liquids change shape when they are poured. ✓

Method. Read the chapter.

1. Read the chapter. The bubbles are carbon dioxide gas.
   carbon dioxide
2. Write the answer.
   carbon dioxide

Check. Carbon dioxide is a gas. ✓

Method. Add the three groups.

1. Add them. 5 solids, 4 liquids and 2 gases.
   5 + 4 + 2
2. Find the total. The total is 11.
   11
3. Write the answer.
   11

Check. Check the table. ✓

Method. Read the liquids column.

1. Read the table. The liquids are water, milk, cooking oil and orange juice.
   liquids
2. Write the answer.
   Accept any one of: water, milk, cooking oil, orange juice.

Check. Any one of these flows. ✓

Method. Think about the rock.

1. Think about its shape. A rock is hard and keeps its shape.
   keeps its shape
2. Write the answer.
   yes

Check. Rock is a solid. ✓

Method. Compare the amounts.

1. Compare the amounts. Both have 100 ml.
   100 ml and 100 ml
2. Decide. So they have the same amount.
   same
3. Write the answer.
   same

Check. The shape is different, but the amount is the same. ✓

Method. Read the key idea in section 6.3.

1. Read the key idea. A gas spreads out to fill its container.
   fills
2. Write the answer.
   gas

Check. Gases fill whatever they are in. ✓

Method. Think about what pouring needs.

1. Think about a solid. A solid keeps its shape and does not flow.
   does not flow
2. Decide. So a solid cannot be poured, and Ruby is not right.
   not right
3. Write the answer.
   No. Accept any reason that says a solid keeps its shape and does not flow, so it cannot be poured.

Check. Pouring needs a liquid. ✓

Method. Compare the two states.

1. Think about the solid. A solid keeps its own shape.
   own shape
2. Think about the gas. A gas spreads out to fill its container.
   spreads out
3. Write the answer.
   Accept any sentence that says a gas spreads out to fill its container, but a solid keeps its own shape.

Check. The two states behave in opposite ways. ✓

Method. Think about which one keeps its shape.

1. Look at each one. Wood is a solid, because it keeps its own shape.
   solid
2. Write the answer.
   wood

Check. Milk is a liquid, and air is a gas. ✓

Method. Read the key idea.

1. Read the key idea. A liquid takes the shape of its container.
   takes the shape
2. Write the answer.
   no

Check. A liquid changes shape when it is poured. ✓

Method. Read the chapter.

1. Read the chapter. The bubbles in fizzy water are carbon dioxide.
   carbon dioxide
2. Write the answer.
   carbon dioxide

Check. Carbon dioxide is a gas. ✓

Method. Read the key idea.

1. Read the key idea. A material that spreads out to fill its container is a gas.
   gas
2. Write the answer.
   gas

Check. A gas spreads out to fill its container. ✓

Method. Think about each material.

1. Wood. Wood keeps its shape, so it is a solid.
   solid
2. Water and air. Water flows, so it is a liquid. Air spreads out, so it is a gas.
   liquid; gas
3. Write the answer.
   solid; liquid; gas

Check. Each material is in one group only. ✓

Method. Think about the solids.

1. Think of two. Wood, ice, a metal spoon, a rock and a plastic bottle are all solids.
   solids
2. Write the answer.
   Accept any two of: wood, ice, metal spoon, rock, plastic bottle.

Check. Any two of these keep their shape. ✓

Method. Think about the gas and the solid.

1. Think about the gas. A gas has space in it, so it can be squashed.
   space
2. Think about the solid. A solid keeps its shape, so it is hard to squash.
   hard to squash
3. Write the answer.
   Accept any sentence that says a gas has space in it, so it can be squashed, while a solid keeps its shape and is hard to squash.

Check. The two states behave differently when squashed. ✓

Method. Sort each material by its state.

1. Air. Air spreads out to fill a container, so it is a gas.
   gas: air
2. Ice. Ice keeps its own shape, so it is a solid.
   solid: ice
3. Cooking oil. Cooking oil flows and can be poured, so it is a liquid.
   liquid: cooking oil
4. Write the answer.
   gas: air; solid: ice; liquid: cooking oil

Check. Every material has one state. ✓

Method. Read the amount.

1. Read the amount. The same 100 ml of water is poured into both containers.
   100 ml
2. Write the answer.
   100

Check. The shape changes, but the amount does not. ✓

Method. Think about the amount and the shape.

1. Think about the amount. Both have 100 ml, so the amount is the same.
   same
2. Think about the shape. Only the shape of the water is different, because of the container.
   shape
3. Write the answer.
   Accept any sentence that says the amount is the same, and only the shape of the water is different.

Check. Amount and shape are different things. ✓