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Pretest: Chemical Reactions
14
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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.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: