Predicting states of matter | Combined science | Quizalize & Oak National Academy

Starter quiz

Which of the following statements can correctly finish this sentence?: Substances in a solid state...

cannot be compressed. ✓

do not take the shape of the container they are in. ✓

have larger particles than all substances in a liquid state.

have particles which have no energy at all.

have particles which vibrate around their fixed positions. ✓
Which of the following statements can correctly finish this sentence? Substances in a liquid state…

at boiling point can form bubbles of the substance anywhere in the liquid. ✓

can be compressed.

have particles at the surface which may have enough energy to leave. ✓

have particles which can move around and over each other. ✓

take the shape of the whole of the container they are in.
Which of the following statements can correctly finish this sentence? Substances in a gas state…

are formed in the bubbles inside a liquid at boiling point ✓

can be compressed ✓

have particles which are not attracted to each other at all, ever

have particles which can escape an open container to fill all the space ✓

take the shape of the container they are in ✓
As particles gain energy, they are able to overcome the ______ between them.

'forces of attraction' ✓
Which aspects of a particle change when a substance’s state of matter changes?

arrangement relative to other particles ✓

energy of particle ✓

movement of particle ✓

shape of particle

size of particle
Match the following terms to their definitions.

boiling point

⇔

temperature where substance changes from liquid state to gas state ✓

condensing point

⇔

temperature where substance changes from gas state to liquid state ✓

freezing point

⇔

temperature where substance changes from liquid state to solid state ✓

melting point

⇔

temperature where substance changes from solid state to liquid state ✓

Exit quiz

Changes of state, such as when a substance in the solid state becomes a substance in the liquid state, do not involve the formation of new substances, so these are ______ changes.

'physical' ✓
In the main image, the important information has been replaced with grey boxes. Which of the three images below is the best representation of a chemical change of substances in the same state?

image 1 ✓

image 2

image 3
Starting from a substance in the gas state, sort the states and the temperatures at which changes of state happen in order?

1

⇔

substance in the gas state

2

⇔

condensing point

3

⇔

substance in the liquid state

4

⇔

freezing point

5

⇔

substance in the solid state
In the image below, what indicates that substance A has a lower melting point than substance B?

the colour of the particles: green is a colder colour than pink

the direction of the arrows: different arrows going in all directions

the shading of the particles: darker means stronger

the thickness of the arrows: thinner means weaker ✓
Three balloons are filled with neon, methane and oxygen, respectively. Why would you expect the substance in the methane filled balloon to have the highest boiling point?

it has more than one type of atom in its molecules

it has strong covalent bonds in the molecules

it has stronger intermolecular forces between the particles ✓

it has the biggest particles and they do not move
At which temperature are all these substances in a liquid state?

at -200 $^o$ C

at 25 $^o$ C

at 1500 $^o$ C

between 0 and 100 $^o$ C

never ✓

Worksheet

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Lesson Details

Key learning points

There are changes in arrangement, movement and energy of particles during state changes.
There are two types of change, physical and chemical, and these can be explained in terms of the particle model.
The physical state of a substance can be predicted at specified temperatures.
Forces of attraction between particles have a role in determining the amount of energy needed for state changes.

Common misconception

Pupils often confuse physical and chemical changes. Also, pupils do not appreciate that substances can exist in any state of matter depending on temperature.

Use the phrasing 'substances in a solid state' rather than solids to avoid pupils thinking that the substance only exits in one specific state.

Keywords

Physical change - A change in which no new substances are formed, such as a change in state, e.g. melting.
Chemical change - When a reaction takes place and atoms or ions in the reactants are rearranged to make new products/substances.