10 questions🇬🇧English
🫧 The Particle Model – Year 7
Chemistry · Year 7 (KS3) — particles in solids, liquids and gases, changes of state and diffusion
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Questions
Which description matches the particles in a solid?
Far apart, moving quickly in all directions
Close together in a regular pattern, vibrating in place
Close together, randomly arranged, sliding past each other
Far apart in a regular pattern, vibrating in place
20s
What is the name of the change of state from a gas to a liquid?
Condensing
Freezing
Evaporating
Melting
20s
In which state are particles touching each other but able to slide past one another?
Liquid
Gas
All three states
Solid
20s
Dry ice turns straight from a solid into a gas without melting. What is this change called?
Sublimation
Condensation
Evaporation
Boiling
20s
A 50 g block of ice melts completely in a sealed bag. What is the mass of the water formed?
50 g
More than 50 g
0 g, because it is now a liquid
Less than 50 g
20s
What causes the pressure of a gas inside a container?
Particles sticking to the walls of the container
Particles getting bigger as they move
Particles colliding with the walls of the container
Particles pushing against each other in a fixed pattern
20s
A drop of food colouring spreads faster in hot water than in cold water. Why?
The colouring particles melt in the hot water
The particles move faster at a higher temperature
The particles get bigger at a higher temperature
Hot water has fewer particles to get in the way
30s
Why can a gas be squashed into a smaller volume much more easily than a liquid?
There are large spaces between gas particles
Gas particles can be squeezed into smaller sizes
Gas particles are smaller than liquid particles
Gas particles are softer than liquid particles
30s
A substance melts at −218 °C and boils at −183 °C. What state is it in at −200 °C?
Gas
Solid and liquid together
Solid
Liquid
30s
When pure water boils, bubbles form inside it. What are these bubbles mainly made of?
Water vapour
Hydrogen and oxygen gases
Empty space with no particles
Air
30s