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Understanding Chemical Reactions

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Jennifer Balsbaugh

on 26 January 2017

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Transcript of Understanding Chemical Reactions

Understanding Chemical Reactions
Chp 5 Lesson 1

Chemical Reactions
A process in which atoms of one or more substances rearrange to form one or more new substances.

How do you know a chemical reaction occurred? Look for the following!
What occurs during a chemical reaction
1. Particles collide with enough energy to break bonds.

2. Atoms seperate, rearrange, and new bonds form.
Chemical Equations
Element symbols and chemical formulas are used to write chemical equations.
There are two parts to each equation: reactants and products.
Change in Color or Odor
Moldy Food! Yuck!
Precipitation: two liquids form a solid
Gas produced
Bubbles!
Release of light
Change of Energy
Exothermic reaction:
energy is released, temperature increases
Endothermic reaction:
energy is absorbed, temperature decreases
Fe + S FeS
Reactants
Reactants: compounds/elements that you start with
Fe + S FeS
products
Products: compounds/elements that you end with
Fe + S FeS
Between the reactants and products you must draw an arrow. It stands for
yields
.
The Law of Conservation of Mass
States that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after a chemical reaction.

In other words: matter can neither be created nor destroyed.
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