chemical changes
what is a chemical reaction?
word equations
differences and examples of physical and chemical changes
different types of chemical reactions
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
synthesis
oxidation
combustion
rusting
decomposition
examples
sodium + chlorine → sodium chloride
potassium hydroxide + sulfuric acid → potassium sulfate + water
physical change
chemical change
how does a chemical reaction occur?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
is a permanent change.
is a temporary change.
only change the appearance of a substance
cause a substance to change into an entirely substance with a new chemical formula.