# Testing Liquids

In this worksheet, students will consolidate their understanding of liquids by answering questions about the properties of these materials.

Key stage:  KS 2

Curriculum topic:   States of Matter

Curriculum subtopic:   Solids, Liquids and Gases

Difficulty level:

### QUESTION 1 of 10

Science isn't always black or white - or rather, liquid or solid. Some liquids are so thick and sticky that they seem to have the properties of solids.

There are some tests we can do that indicate which properties a material has. When we know the properties, it's easier to classify the material as a liquid or a solid.

So, now we've got that sorted out, lets have a look at Solids and Liquids!

Joe is making some observations to test for the properties of liquids. He pushes his finger into some washing-up liquid in a petri dish.

Which ONE of these observations does he notice when he lifts his finger out?

It flows back

It does not move

It changes colour

Unlike gases, Joe thinks that liquids have a definite volume (space they take up) which can be measured.

Do you think he is correct?

Yes, Joe is correct

No, Joe is wrong

Which unit can we use to measure the volume of liquids?

kilograms (kg)

millilitres (ml)

grams

Joe pours shampoo into a beaker.

Which TWO of these observations does he notice?

it takes the shape of the beaker

it has a lumpy surface

it has a flat, smooth surface

it changes into a solid

Ellie has also been investigating liquids.

Which TWO of these statements are true properties of liquids?

cannot easily be compressed (squashed)

expand to fill the space available

cannot be cut

are magnetic

What is the science word which describes the reversible change of a liquid to a solid?

freezing

melting

evaporating

condensing

The freezing point of water is zero degrees Celsius, but other materials have higher or lower freezing points.

Look at the list of materials below. Which of these materials do you think are frozen (solid) at room temperature?

ice cream

silver

mercury

butter

chocolate

When liquid changes into a gas, the reversible change is called...

condensation

evolution

evaporation

Which TWO of these are examples of evaporation?

getting salt out of salty water

water vapour in clouds

puddles drying up

hot liquid wax

Changing liquid to gas is a slow process at room temperature.

Which TWO of the following do you think will speed up evaporation?

pouring the liquid into a smaller container

increasing the air flow

increasing the temperature

reducing the temperature

• Question 1

Joe is making some observations to test for the properties of liquids. He pushes his finger into some washing-up liquid in a petri dish.

Which ONE of these observations does he notice when he lifts his finger out?

It flows back
EDDIE SAYS
The washing-up liquid flows back into the space Joe's finger took up , but some liquids take longer than others! Liquids have spaces between their particles (atoms/molecules) which allows them to flow and move.
• Question 2

Unlike gases, Joe thinks that liquids have a definite volume (space they take up) which can be measured.

Do you think he is correct?

Yes, Joe is correct
EDDIE SAYS
Yes, liquids have a definite volume, which can be measured. Some custard in a jug has a definite surface (where it "ends") so it has a certain volume.
• Question 3

Which unit can we use to measure the volume of liquids?

millilitres (ml)
EDDIE SAYS
Litres, millilitres, cubic centimetres (cm3) and cubic metres (m3) are all units which are used to measure volume.
• Question 4

Joe pours shampoo into a beaker.

Which TWO of these observations does he notice?

it takes the shape of the beaker
it has a flat, smooth surface
EDDIE SAYS
Yes, Joe's shampoo is now the shape of the beaker and it has a definite flat, smooth surface. Remember, the particles in a liquid, like shampoo, can flow and that means they flow to fill the space, ending at their surface.
• Question 5

Ellie has also been investigating liquids.

Which TWO of these statements are true properties of liquids?

cannot easily be compressed (squashed)
cannot be cut
EDDIE SAYS
Liquids are really hard to compress (squash) - that's why they're used in HYDRAULIC lifts, like on a mechanical digger. Have you ever tried to cut a liquid? No point, is there?! They don't expand to fill their whole space - as you'll find out, that's a property of gases.
• Question 6

What is the science word which describes the reversible change of a liquid to a solid?

freezing
EDDIE SAYS
We think of water changing to ice as 'freezing', but in science, freezing means the change of any liquid to its solid state. It's quite hard to get your head around - you kinda have to separate the word "freezing" from the word "cold" - when a liquid freezes it turns to a solid. Get this: molten iron "freezes" at over 1500C! Boy, that's hot!
• Question 7

The freezing point of water is zero degrees Celsius, but other materials have higher or lower freezing points.

Look at the list of materials below. Which of these materials do you think are frozen (solid) at room temperature?

silver
butter
chocolate
EDDIE SAYS
Silver and mercury are both metals. Mercury was used in thermometers, but it's a very toxic metal and has been replaced by other liquids.
Mercury is the only metal which is liquid at room temperature!
Ice cream soon melts as it heats up, as does butter (but a little warmer!).
• Question 8

When liquid changes into a gas, the reversible change is called...

evaporation
EDDIE SAYS
Remember this from earlier? Bathroom? When a liquid is warm enough, some particles escape from its surface and become a gas/vapour. That's like steam rising off a cup of tea.
• Question 9

Which TWO of these are examples of evaporation?

getting salt out of salty water
puddles drying up
EDDIE SAYS
That needed some thought! If you leave a dish of sea water out, the water will evaporate away to leave salt. Also, puddles disappear as the water evaoprates in warmer weather. By the way, water vapour forming clouds is an example of condensation!
• Question 10

Changing liquid to gas is a slow process at room temperature.

Which TWO of the following do you think will speed up evaporation?

increasing the air flow
increasing the temperature
EDDIE SAYS
Think about it: clothes dry faster in warm, windy weather! The increased temperature and the increased wind all help. The wind helps to "blow away" the water particles from around the clothes, helping them to dry out. By the way, pouring the liquid into a smaller container is likely to slow down evaporation as there's less surface on the liquid to allow evaporation from. Make sense?
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