Solids, Liquids and Gases 1
When a liquid cools enough to become solid, it has frozen.

Solids, Liquids and Gases 1

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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.

1.
Which has the most densely-packed particles?
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
2.
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)
Solids stay the same shape and size, whatever container they are in
3.
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
You can see the tiny solid crystals when you look closely at sugar
4.
Which of these has the least densely-packed particles?
Solids
Liquids
Gases
Both liquids and gasses
Gasses have low density, with particles moving randomly and at high speed
5.
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
The shape of a liquid changes to fit its container
6.
What is the freezing point of water?
-55o C
-12o C
0o C
32o C
The Celsius temperature scale is based on the freezing and boiling points of water - 0o C is the freezing point and 100o C is the boiling point
7.
What is the boiling point of water?
0o C
50o C
100o C
212o C
Water boils at 100o 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 90o C!
8.
When a solid is heated, it changes into a liquid. What do we call this process?
Condensing
Freezing
Dissolving
Melting
Ice is a solid. If you heat it, it melts and becomes a liquid (water)
9.
When a liquid cools enough it becomes a solid. What do we call this process?
Evaporating
Condensing
Freezing
Dissolving
When water (a liquid) is cold enough it freezes and turns into ice (a solid)
10.
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
Gasses always take the same shape and volume as their containers. If not held in a sealed container, a gas will keep spreading
Author:  Sheri Smith

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