This is the video that we ran out of time for today, if you want to do some more revision see if you can work out if it is exo or endothermic and why.

Keypoints

These are the five points that you should know for the test tomorrow, along with some sample anwers:  Remember that they're also on the back of the sheet from todays class, and that the other revision sheet will help you:
The difference between elements, molecules and compounds.

What the reactivity series can be used for:

What the three sides of the fire triangle are:

What exo and endothermic reactions are:

How to test for acids and bases:

1. An element is one type of chemical, a molecule is two or more atoms of one element bonded together and a compound is two or more different elements bonded together.

     2. The reactivity series can be used to predict the products in a reaction.
     3. The three sides of the fire triangle are heat, fuel and oxygen.  Without all three, you can't start a fire(also called a combustion reaction).
     4. Exothermic reactions give out heat (like a match burning) and release energy.  Endothermic reactions take in heat (like an ice cube melting) and require energy. 
     5. Acids and alkalis can be tested using Universal Indicator.  Acids (pH from 1-6) turn red if they are strong or orange/yellow if they're weak, while alkalis (pH 8-14) turn purple if theyre strong and blue if theyre weak.  Neutral things (pH 7) turn green.