chemical reactions
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atoms combine to form _____ and molecules react with one another to form _______
stable molecules; new molecules
a chemical reactions is a process that _____ one bonding arrangement among atoms for a _______ bonding arrangement
exchanges; different
chemical reactions can happen between what three things
atoms, molecules and compounds
molecule is any
arrangement of two or more atoms bonded together EX: CO2 H2
compound is
a substance made of two or more elements. any molecule that contains two or more elements EX: SoH2O
chemical equations
mathematical representations of a chemical reaction
products
in a chemical equation the substances on the right side of the equation; the substances that are formed in a chemical reaction
reactants
substances to the left side of the equation; the starting materials in a chemical reaction
balanced equation
meaning that there is the same number of each type of atom on both sides of the equation
synthesis reaction
two different substances combine to form a more complex product
decomposition reaction
that complex product is broken down into its constituent parts
oxidation-reduction reactions or redox reaction
involves a transfer of electrons between two chemical species
acid
a compound substance with pH less than 7
base
a compound substance with a pH greater than 7; tendency to accept a proton
pH scale
measure of acidity or alkalinity 0 to 14