This document discusses different types of chemical reactions including synthesis reactions where substances join to form new compounds, decomposition reactions where compounds break down into simpler substances, replacement reactions where one element replaces another in a compound, and combustion reactions where oxygen combines with other compounds to form water and carbon dioxide. It also describes exothermic reactions which release heat and endothermic reactions which absorb heat. Neutralization reactions involve acids and bases canceling each other out.

1. BY James Pressley

2. Changing Matter
• Changing Matter first starts off with:
chemical reactions, synthesis reactions,
decomposition reactions, replacement
reactions, combustion, exothermic and
endothermic reactions, and
neutralization.

3. Chemical Reactions
• Chemical reactions changes matter
come when different types of matter
interact with each other or with
sources of energy. In any chemical
reaction there are two parts. Reactants
are the substances that go into the
reaction: products are the new
substances that are produced.

4. Synthesis Reactions
• In synthesis reactions, two or more
substances chemically join to form a
new compound. Rust is formed when the
iron in a bike rim, for example, and the
oxygen in air react chemically. This is an
oxidation reaction.

5. Decomposition Reactions
• Some compounds will break down into
two or more simpler substances. An
example of a decomposition reaction is
souring milk. Lactose is a sugar in milk.
It breaks down into lactic acid ,
producing a sugar taste.

6. Replacement Reactions
• Sometimes a free element simply takes
the place of another element in a
compound, leaving the second element
as a free element. Smelting iron takes
advantage of this process. Take a look
at the following equation.

7. Combustion
A combustion reaction is when oxygen
combines with another compound to
form water and carbon dioxide.
Combustion is really the chemical
process of burning.

8. Exothermic & Endothermic Reactions
• One result of chemical reactions is
temperature change. Some chemical
reactions, called exothermic reactions,
release heat, producing an increase in
temperature.
• Endothermic reactions absorb heat
energy and produce a rise in
temperature.

9. Neutralization
In the last issue you learned that
compounds can be categorized as acids
and bases. Strong acids and strong bases
can have corrosive and dangerous effects.
Here is an example of neutralization
reactions: