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Description
| Question | Answer |
| Physical Change | Hamza Ahmed Year 8 |
| What is physical change? | A change where no new substance is formed |
| What are particles? | The minute portion of matter |
| What is the particle model? | A simplified representation of solids, liquids and gases |
| What are the points of the particle model? | |
| How are particles shaped in solids? | The particles are packed tightly together |
| How are particles shaped in liquids? | They are packed loosely together |
| How are particles shaped in gases? | They are not stuck to each other at all and move freely |
| Are particles able to move? | Yes, they vibrate in ther positions where ever they are |
| What happens when the particles in solid and liquids are heated? | The vibrations increase which causes the substance to expand |
| What happens when the particles in solids and liquids are cooled? | The vibrations decrease which causes the substance to contract |
| How do the particles act in gases? | They move around in the container they're in and hit the walls of the container |
| What happens when particles in gases are heated? | The particles move around more frequently and hit the walls of the container with moreforce |
| What happens when particles in gases are cooled? | The particles move around less frequently and hit the walls of the container with less force |
| What causes melting? | Whe solids are heated enough that the vibrations become so energetic and they become liquids |
| What causes freezing? | Whe liquids are cooled enough that the vibrations become slow and they become a solid |
| What causes evaporation? | When a liquid is heated enough that the particles become unstuck and it becomes a gas |
| What causes condensation? | When a gas is cooled enough that the particles come together and form a liquid |
| What is diffusion? | Particles of 2 gases or 2 liquids mix without stirring |
| How do gas particles travel during diffusion? | In a zig-zag fashion, each particle moves in a straight line untill it collides with another particle and changes direction |
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