Chemical Reactions

Make sure you can explain the difference between a physical and a chemical change. 

We can represent that a chemical reaction has taken place using symbols, but like a cook  follows a recipe, a chemist needs to know the right proportions of chemical reactants to make their expected products. 

So balancing equations are a bit like a cooking recipe for a chemist!

Exothermic Reaction - to give out heat energy, causing an increase in the temperature of the surroundings. 

Endothermic Reaction  - To take in heat energy, causing a decrease in the temperature of the surroundings. 

Understanding that the mass of reactants in a chemical reaction must be equal to the mass of products made in the chemical reaction.