Types of reactions

TYPES OF REACTIONS: 1. Oxidation2. Combustion3. Reduction4. Decomposition5. Neutralization6. Precipitation7. Displacement

Oxidation When a substance reacts with oxygen. *example* zinc + oxygen zinc oxide

*example* butter and cooking oils going off respiration

Combustion When a substance burns in oxygen. - the products are ALWAYS carbon dioxide, water, and energy. *example*Methane + oxygen carbon dioxide+water

Decomposition When a compound breaks into simpler

substances: Thermal decomposition silver oxide –heat silver+ oxygen Electrical decomposition sodium chloride –electrical energy sodium+ chlorine Decomposition by light silver bromide– light energy silver + bromine

Decomposition:

Larry harry Louis

Neutralization Acid+ base= salt +water

Example:HCL+ calcium carbonate calcium chloride + CO2 + water

Single displacement:

Eleanor larry elounor harry

Double displacement

Conservation of mass The total mass of the reactants is equal

to the total mass of the products.

Energy changes: Exothermic reaction: when energy is

given out. And the mixture gets hotter (release heat)

- example: combustion/ respiration

Endothermic reaction: when energy is taken in. and the mixture gets colder (take in the heat).

- example: decomposition by light

Chemical equations A chemical reaction is a process in which 2 or

more substances combine chemically together to form one or more new substances.

One way to describe a chemical reaction is by writing a chemical equation.

A chemical equation represents with words /symbols/formula, the reactants and products in a chemical reaction.

Reactants -----> products Types of chemical equations: word equation formula equation

Displacement When a more reactive element takes place of a

less reactive element: Example: Chromium oxide+ aluminum= chromium+ aluminum oxide