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Key Stage 3 Science

QuestionAnswer
Describe the properties of solids liquids and gases in terms of shape and volue. Solids have a fixed volume but do not have a fixed shape. Liquids have a fixed volume but do not have a fixed shape. Gases do not have a fixed shape or a fixed volume
Why do small specks of matter move in Brownian motion? The specks are hit by moving particles that make up liquids or gases.
Describe the arrangement of particles in a gas, liquid and solid In gases the particles are far apart. In liquids the particles are close together but not in rows. each other. In solids the particles are close together in rows.
Describe the movement of particles in a gas, liquids and solids In gases the particles move randomly. In liquids they move around each other. In solids they vibrate
Why do small specks of matter move in Brownian motion? The specks are hit by moving particles that make up liquids or gases.
Why can gases be easily squashed whereas liquids and solids cannot. In gases the particles are far apart. In liquids and solids they are close together.
Explain what happens to particles making up a liquid or gas during diffusion. They mix and spread out without anything moving them
How do the particles of a gas cause gas pressure? They hit the walls of the container.
Name the changes of state that take place from solid to liquid to gas and back again. melting --> boiling--> condensation --> freezing
Why will increasing the volume of container filled with a gas decrease the pressure of that gas? The particles of gas will hit the walls of the container less often.
Compare the strength of forces between particles in solids liquids and gases Solids > Liquids > Gases
Explain three ways of increasing the pressure of a gas Raise the temperature, Decrease the volume, Increase the amount of gas
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