Chemistry

By Isabelle Stoffer

Atoms, Elements, Molecules, Compounds

Atoms- An atom is the basic particle from which all elements are made.

Elements-A pure substance that cannot be broken down into other substances by physical or chemical means.

Molecules - A particle made of two or more atoms together

Compounds- A pure substance made of two or more atoms combined.

Physical and Chemical properties

Physical Properties- Something you can change that wont change the object.

Chemical Properties- Something that makes the object what it is.

Physical and Chemical Changes

Physical Change- A change that will just change it's physical properties.

Chemical Change- A change that will change the object into something else.

Endothermic and Exothermic

Endothermic Change- Something that take something else's energy.

Exothermic Change- Something that gives out energy.

Three States of Matter

Solid- In a solid the particles are so close to gather and can only vibrate instead of being able to move around freely. It is like this because it has a strong force attraction. An example of this state a ice cube.

Liquid- In a liquid particles can move around but can't go anywhere they want. It is because the force attraction is weaker than a solid but still strong enough. An example of this state is water.

Gas- In a gas the particles are able to go wherever they please. It is like this because there is no force attraction in a gas. An example of a gas is helium.

Changes of State

Matter changes from one state to another by either freezing or warming up. Also by adding or decreasing pressure.


All five state changes-

Liquid to Solid

Solid to Liquid

Liquid to Gas

Solid to Gas

Gas to Liquid


Energy relates to matter changing state because by adding or losing different temperatures you are adding or losing energy.

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