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Particle Theory

Year 7 Test Revision

What are the three states of matter? Solid, liquid, gas.
What is the meaning of 'property'? Things which a material can do or does which makes it that material.
Describe particles in a solid. Particles regularly arranged. Held together by bonds meaning their shape is fixed.
Describe particles in a liquid. Particles are able to move. The bonds are broken so they change to the shape of their container
Describe particles in a gas. Particles are free to move and spread out. They fill their container. They can be compressed.
Describe some properties of solids. Easily controlled, cannot flow, can be cut, have definite shape and volume.
Describe some properties of liquids. Difficult to control, cannot easily be compressed. Can flow and take the shape of their containers. Have definite volume but different shapes. Cannot be cut.
Describe some properties of gases. Hard to control, can easily be compressed, cannot be cut. Flow easily, spreading into open spaces. Do not have definite volume or shape.
What happens as we add more energy to particles. There is increasing vibration and movement of the particles.
What does expansion mean? Increase in volume.
What does contraction mean? Decrease in volume.
What happens when matter is heated? Its particles move faster and collide more. This makes them move apart and the matter expands.
What happens when matter is cooled? Particles slow down and move close so the matter contracts (shrinks).
What is diffusion? Movement of a substance from an area of high concentration to an area of low concentration.
What is kinetic energy? The kinetic energy of an object is the energy that it possesses due to its motion movement).
What causes gas pressure? As particles move, they bump into the sides of their container.
What happens when you blow up a balloon? Air is forced into a balloon under pressure. As the number of air particles and collisions increase, the pressure inside the balloon increases.