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Pretest: Chemical Reactions
14
Drag each tile to the correct box. Not all tiles will be used.
A chemical reaction takes place in which energy is released. Arrange the reaction's characteristics in order from start to finish.
lower energy of reactants
higher energy of products
higher energy of reactants
transition state
lower energy of products

In the last chapter we looked at the particle model of matter and specifically at changes of state. Do you remember heating and cooling candle wax to observe it melt and then solidify. The wax first changed from a solid into a liquid and then back to a solid again. These are physical changes. The chemical properties of the substance does not change.

We are now going to look at what happens when we get chemical changes in substances. These take place during chemical reactions.

mention the spill to the teacher clean the area and throw the broken pieces away

explanation: