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Science: Middle School: Grades 6, 7 and 8 Quiz - Solids, Liquids and Gases 1 (Questions)

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Everything is made up of matter. Matter can be in these different states: solid, liquid or gas. If you look around, you can see all sorts of objects. These are solids. Ice is solid water. You might have a drink - hopefully not near your computer! Drinks are liquids. Air is the invisible matter surrounding you. Air is a mixture of gasses - oxygen and carbon dioxide for example. Steam, or water vapor, is water in the form of a gas.

Which of these is not true of solids?

[ ]	Solids can be cut or shaped
[ ]	A solid expands to fill its container
[ ]	Solids will stay the same shape and size unless acted upon by a force
[ ]	Solids can be grasped (held on to)

Which of these is not true of liquids?

[ ]	The shape of a liquid does not change
[ ]	A liquid takes the shape of its container
[ ]	Liquids are runny and can be poured
[ ]	The volume of a liquid does not change

Which of these is not true of gasses?

[ ]	Unless held in a sealed container, gasses keep expanding in volume
[ ]	A gas takes the same shape as its container
[ ]	A gas will have the same volume as its container
[ ]	Gasses can be poured from one container to another

Which has the most densely-packed particles?

[ ]	Solids
[ ]	Liquids
[ ]	Gases
[ ]	Particles are equally dense in solids, liquids and gasses

Which of these has the least densely-packed particles?

[ ]	Solids
[ ]	Liquids
[ ]	Gases
[ ]	Both liquids and gasses

When a solid is heated, it changes into a liquid. What do we call this process?

[ ]	Condensing
[ ]	Freezing
[ ]	Dissolving
[ ]	Melting

When a liquid cools enough it becomes a solid. What do we call this process?

[ ]	Evaporating
[ ]	Condensing
[ ]	Freezing
[ ]	Dissolving

What is the boiling point of water?

[ ]	0^o C
[ ]	50^o C
[ ]	100^o C
[ ]	212^o C

What is the freezing point of water?

[ ]	-55^o C
[ ]	-12^o C
[ ]	0^o C
[ ]	32^o C

10.

When you fill a jug with sugar, it appears to have the same shape as the jug. You can also tip sugar from one container to another. Is sugar a solid, a liquid or a gas?

[ ]	A liquid
[ ]	A solid
[ ]	A gas
[ ]	A condensed gas

Science: Middle School: Grades 6, 7 and 8 Quiz - Solids, Liquids and Gases 1 (Answers)

Which of these is not true of solids?

[ ]	Solids can be cut or shaped
[x]	A solid expands to fill its container
[ ]	Solids will stay the same shape and size unless acted upon by a force
[ ]	Solids can be grasped (held on to)

Solids stay the same shape and size, whatever container they are in

Which of these is not true of liquids?

[x]	The shape of a liquid does not change
[ ]	A liquid takes the shape of its container
[ ]	Liquids are runny and can be poured
[ ]	The volume of a liquid does not change

The shape of a liquid changes to fit its container

Which of these is not true of gasses?

[ ]	Unless held in a sealed container, gasses keep expanding in volume
[ ]	A gas takes the same shape as its container
[ ]	A gas will have the same volume as its container
[x]	Gasses can be poured from one container to another

Gasses always take the same shape and volume as their containers. If not held in a sealed container, a gas will keep spreading

Which has the most densely-packed particles?

[x]	Solids
[ ]	Liquids
[ ]	Gases
[ ]	Particles are equally dense in solids, liquids and gasses

The particles of a solid are held together by strong forces of attraction

Which of these has the least densely-packed particles?

[ ]	Solids
[ ]	Liquids
[x]	Gases
[ ]	Both liquids and gasses

Gasses have low density, with particles moving randomly and at high speed

When a solid is heated, it changes into a liquid. What do we call this process?

[ ]	Condensing
[ ]	Freezing
[ ]	Dissolving
[x]	Melting

Ice is a solid. If you heat it, it melts and becomes a liquid (water)

When a liquid cools enough it becomes a solid. What do we call this process?

[ ]	Evaporating
[ ]	Condensing
[x]	Freezing
[ ]	Dissolving

When water (a liquid) is cold enough it freezes and turns into ice (a solid)

What is the boiling point of water?

[ ]	0^o C
[ ]	50^o C
[x]	100^o C
[ ]	212^o C

Water boils at 100^o C if you live close to sea-level. If you lived at the top of a 3,048 meter mountain, your water would boil at 90^o C!

What is the freezing point of water?

[ ]	-55^o C
[ ]	-12^o C
[x]	0^o C
[ ]	32^o C

The Celsius temperature scale is based on the freezing and boiling points of water - 0^o C is the freezing point and 100^o C is the boiling point

10.

When you fill a jug with sugar, it appears to have the same shape as the jug. You can also tip sugar from one container to another. Is sugar a solid, a liquid or a gas?

[ ]	A liquid
[x]	A solid
[ ]	A gas
[ ]	A condensed gas

You can see the tiny solid crystals when you look closely at sugar