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Particle Theory
Year 7 Test Revision
Question | Answer |
---|---|
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. |