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Writing Chemical Equations (Classifying Chemical Reactions (Synthesis…
Writing Chemical Equations
Understanding Chemical Equations
Writing Chemical Formulas
subscripts show the number of atoms of an element in a molecule or the ratio of elements in a compound
Structure of an Equation
the materials you have at the beginning are called the reactants
when the reaction is complete you have different materials called products of the reaction
a chemical equation uses symbols and formulas to show the reactants and the products of a chemical reaction
Conservation of Mass
the amount of matter involved in a chemical reaction does not change. the total mass of the reactants must equal the total mass of the products
this principle, called the conservation of mass, means that during a chemical reaction, matter is not created or destroyed
Balancing Chemical Equations
a coefficient is a number placed in front of a chemical formula in an equation
Classifying Chemical Reactions
many chemical reactions can be classified in one of three categories: synthesis, decomposition, or replacment
Synthesis
when two or more substances combine to make a more complex substance, the process is called synthesis
Decomposition
while a synthesis builds compounds from simpler reactants, a process called decomposition breaks down compounds into simpler products
Replacement
when one element replaces another in a compound, or when two elements in different compounds trade places, the process is called replacement