2024年4月24日发(作者：)
人教版化学第6单元笔记手写
English Answer:
Unit 6: Chemical Reactions.
Chemical Reactions.
A chemical reaction is a process in which one or more
substances, the reactants, are transformed into one or more
different substances, the products.
The reactants and products are typically represented by
chemical formulas.
Chemical reactions are represented by chemical
equations, which show the chemical formulas of the
reactants and products, as well as the stoichiometry of the
reaction.
Types of Chemical Reactions.
Combination reaction: Two or more substances combine to
form a single product.
Decomposition reaction: A single compound breaks down
into two or more simpler substances.
Single-displacement reaction: One element replaces
another element in a compound.
Double-displacement reaction: Two compounds exchange
ions to form two new compounds.
Balancing Chemical Equations.
A balanced chemical equation has the same number of
atoms of each element on both sides of the equation.
To balance a chemical equation, coefficients are added
to the chemical formulas of the reactants and products.
Factors Affecting Chemical Reactions.
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