What are Chemical Reactions?

When a chemical change takes place, a chemical reaction

occurs.

Why do Reactions take place?

Chemical reactions take place to make atoms more stable.

What is a Chemical Equation?

A representation of a chemical reaction where the reactants and products are

expressed as formulas.

Reactants → Products

ReactantReactant

The substances that The substances that undergo change in undergo change in

a Chemical a Chemical Reaction.Reaction.

ProductProduct

The new substances The new substances that are a result of that are a result of

a Chemical a Chemical Reactions.Reactions.

Synthesis ReactionsSynthesis Reactions• A reaction where two or more substances

react to form a single substance.• Reactants may be either elements or

compounds.• Product synthesized is always a

compound. The general equation for a Synthesis

Reaction is: A+B → AB

Ex. Sugar+Water = Sugar Water

• Where a compound breaks down into two or more simpler substances

• Reactant is always a compound.• Products may be elements or compounds.

The general equation for a Decomposition Reaction is:

AB → A+BEx. Oreo=Chocolate Cookie+ Cream

A reaction in which one element takes the place of another element in a compound.

A+BC → B+AC

Ex. Burger+Fries&Drink= Fries+Burger& Drink

A reaction in which two different compounds exchange positive ions and form new compounds.

AB+CD → AD+CB

For Example:CaCOз+2HCl → CaCl2+H2COз