RE ACTION TIME By: Ian Tyger

What Are Chemical Reactions? Chemical reactions are the change in a substance because of a chemical change. A chemical reaction takes place to make a stable compound. A chemical equation is a representation of a chemical reaction in which the reactants and products are expressed as formulas. Chemical equations are used to show the process of the reaction, from reactants to product.

Chemical Reactions cont. They should be balanced because in order to show the mass is conserved during a reaction, a chemical equation must be balanced. The reactants in a chemical reaction are the combining parts that form the products. The arrow in a chemical equation could be “react and form” or “yields”.

Synthesis Reactions There are at least two reactants and they form a single substance. For example, mix lemonade mix with water, and you get lemonade. Synthesis reactions can be described using chemical equations. An example of this type of equation: 2NaCl 2 +2NaCl

Decomposition Reaction Decomposition is the opposite of synthesis; a reaction in which a compound breaks down into two or more simpler substances. Say you have a wooden dining table, if it splits apart you have wood, glue, and screws. The left side of the equation shows the reactant and the full compound, and on the right side of the equation it shows the products, or the broken down parts of the reactant.

A reaction in which one element takes the place of another element in a compound. Like when there are two kids playing basketball, and the one steals the ball from the other. Two elements in the reactant side will switch in the product side. A + BC B + AC Single Displacement

Double Displacement A reaction in which two different compounds exchange positive ions and form two new compounds. Like when you buy something, you trade your money for a shirt, for example. Their will be two reactants, and they each trade an element. AB + CD -----> AD + CB