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Chemical Reactions
A balanced equation
Notice that both sides of the arrow have the
same numbers of elements
Law of Conservation of Mass
in a chemical reaction, the total mass of the reactants is the same as the total mass of the products
Antoine Laurent Lavoisier1743-1794
Law of Constant proportions
in chemical compounds, the ratio of the elements is always the same
Joseph Proust 1754-1826
ReactantReactants are any chemicals that you start with.
Reactants and Products
ProductProducts are the chemicals that are made in the reaction.
In our example:
Hydrogen and Oxygen are the
reactants Water is the product
“While some reactions happen spontaneously when reactants are mixed, others will require a
catalyst.
An example of a catalyst is the application of heat to the reactants.
The catalyst is written over the top of the arrow in the equation as drawn below: