All the materials around us can be changed in different ways. A physical change is when a material changes size, shape or state of matter. Physical changes are easy to reverse Eg. Mixing sugar in tea Boiling water Melting ice cream Melting wax

A chemical change to a material results in a completely new material being made. A chemical change is very difficult to reverse. Eg.Some rotting fruit A rusting nail Burning paper Exploding a bomb

In a reaction: The stuff you start with is called the reactant The stuff you produce is called the product Reactant For example: Raw bread doughBread BreadToast Product Reaction Simple Chemical Reactions Baking Toasting

The word equation for a chemical reaction is: ReactantsProducts The starting materials that react with each other are called the reactants. The new materials that are produced by the reaction are called the products. Arrow means “reacts to make”

Chemical reactions There are many changes happening all the time, how can we tell if they are chemical? In every chemical change, products (new substances) are made that are different from the reactants (substances we started with).

Gas:Test for it: Oxygen Carbon dioxide Hydrogen

Solute Solvent Solution Soluble Insoluble Something that is dissolved in a liquid Something that is able to dissolve A mixture formed when a solute dissolves in a solvent A liquid that other substances will dissolve in Something that is not able to dissolve

Filtration and Evaporation A separation technique used to separate soluble substances from their solvents A separation technique used to separate an insoluble substance and a liquid Which is which?

Separating Mixtures

Distillation True or false During evaporation water changes to steam Distillation is condensation followed by evaporation Distillation can be used to prepare pure water for science experiments Condensation is when water changes into ice