Rhian's+chemistry+page+=D



Solid- Solids are little molecules packed together very tightly. Solids can not easily be compressed and are usually hard. The closer the molecules are the harder the solid is. Solids always retain a fixed volume and shape. Solids do not flow easily. The molecules in solids vibrate but don't move from place to place. Solid particles are usually in a regular pattern.

Liquid- The molecules in liquids are packed quite tightly together but can move and slide past each other easily. Liquid molecules are close together without a regular arrangement.The molecules in liquids vibrate, move about and slide past each other. Liquids can flow easily. Liquids will take up the shape of a container. If you pour some water into a cup the water will fill up the bottom first then the rest and will take the shape of the cup. The top part of a liquid will have a flat surface. Liquid molecules are close together but with no regular arrangement.

Gas- Gas molecules can move past one another freely but are very energetic and bounce around constantly.

__**Questions : )**__ __1. What is sublimation? __ A change directly from the solid to the gaseous state without becoming liquid.  __2. Supposing you increased the pressure of the air above the boiling liquid. What would happen to the boiling point of the water? __ The water would boil slower because the particles in the water would be compressed and it would be harder for it to boil or evaporate. __3. Imagine that you are trying to boil water for a cup of tea up a mountain. Why would the cup of tea be fairly horrible?__ It would be horrible because the air pressure up on a mountain is lower and so the water would boil faster at a lower temperature so your tea wouldn't taste very nice. __4. Does water contract or expand on changing from a liquid to a solid?__ Water expands when it turns into a solid.