Changes of State: Water

In this worksheet, students will test how well they can apply their knowledge of solids, liquids and gases and changes of state.

Key stage:  KS 3

Curriculum topic:   Physics: Matter

Curriculum subtopic:   Physical Changes

Difficulty level:

QUESTION 1 of 10

This worksheet tests your understanding about the three states of matter when applied to water.

For example: what is solid water, what has to be done to it to turn it to liquid water?  What is "water gas" called and can it become liquid water again?  Does the outside temperature and pressure matter?  These are some of the aspects of water we'll be exploring.

Is this statement true or false?

The process by which plants give off water vapour is known as perspiration.

true

false

Is this statement true or false?

The rate of evaporation depends on the amount of exposed surface area of the leaf.

true

false

Complete this sentence.

When salt is added to ice, the freezing point of the ice __________.

increases

decreases

remains the same

keeps changing

Complete this sentence.

The rate of evaporation of a glass of water would be highest when the ____________.

water is cold

humidity is high

glass is warmed

glass is covered over at the top by cling film

Complete this sentence.

For water to have a definite shape and size, it must ___________.

be in a container

become steam

be distilled

become ice

Is this statement true or false?

Ice can be changed into water vapour without first becoming water.

true

false

Which is the right statement about water at 0° C?

It is the melting point of ice and freezing point of water.

It is the freezing point of ice and subliming point of water.

It is the freezing point of ice and melting point of water.

Complete this sentence. Tick two options.

Water freezes at 0° C and boils at 100° C. This statement is only true __________.

at sea level

in a laboratory

at any place on Earth

when the water is pure

Is this statement true or false?

When clouds fall as rain, condensation has taken place.

true

false

Is this statement true or false?

We give off water vapour through the pores on our skin.

true

false

• Question 1

Is this statement true or false?

The process by which plants give off water vapour is known as perspiration.

false
EDDIE SAYS
The correct answer is that plants give off water vapour by the process of transpiration. Perspiration is another name for sweating.
• Question 2

Is this statement true or false?

The rate of evaporation depends on the amount of exposed surface area of the leaf.

true
EDDIE SAYS
Yes, this is generally correct. However, many leaves have their surfaces covered by a waxy cuticle that makes it impossible for evaporation to take place on that surface. To give a more precise answer, the rate of evaporation depends upon the number of stomata that are open on that leaf. Whether they are open or closed is also multifactorial, but is largely dependent of whether the leaf is in light or not.
• Question 3

Complete this sentence.

When salt is added to ice, the freezing point of the ice __________.

decreases
EDDIE SAYS
When ice has salt added to it, then the freezing point goes down. If the temperature is higher than that, then the ice melts. This is why salt is added to icy roads.
• Question 4

Complete this sentence.

The rate of evaporation of a glass of water would be highest when the ____________.

glass is warmed
EDDIE SAYS
The rate of evaporation is dependent on the amount of energy provided by the environment, as long as the humidity is low enough for evaporation to take place.
• Question 5

Complete this sentence.

For water to have a definite shape and size, it must ___________.

become ice
EDDIE SAYS
The only way that water can have a shape and size is for it to be frozen, but even here ice does alter in shape as it is formed. This is why we get frozen water pipes if our houses get too cold.
• Question 6

Is this statement true or false?

Ice can be changed into water vapour without first becoming water.

true
EDDIE SAYS
Have you ever noticed that snowmen can begin to disappear even though the temperature has not risen above zero? This is because in dry conditions ice can turn directly into water vapour without becoming a liquid. This process is called sublimation.
• Question 7

Which is the right statement about water at 0° C?

It is the melting point of ice and freezing point of water.
EDDIE SAYS
Water freezes at 0 degrees and ice melts at the same temperature.
• Question 8

Complete this sentence. Tick two options.

Water freezes at 0° C and boils at 100° C. This statement is only true __________.

at sea level
when the water is pure
EDDIE SAYS
Water has to be pure to change state at those temperatures. It also has to be at standard pressure, nominally 1 atmosphere, or 760 mm Mercury. If the air pressure is different from this, then the temperature needed to boil water drops. It is impossible to make a decent cup of tea on top of Mount Everest as water boils there when it is only lukewarm!
• Question 9

Is this statement true or false?

When clouds fall as rain, condensation has taken place.

true
EDDIE SAYS
Yes, the falling of any sort of precipitation (rain, snow or sleet) involves the condensation of water vapour into water as liquid or solid.
• Question 10

Is this statement true or false?

We give off water vapour through the pores on our skin.

false
EDDIE SAYS
This is a rather picky question. We actually sweat liquid water, so water vapour does not come out through our pores. Once on the surface of the skin, it then evaporates.
---- OR ----

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