Vocabulary
Reactant
Shown on the left side of the reaction arrow; sometimes called reagents or starting material
Chemical equations describe...
chemical changes
Classify this reaction: 2 H2O --> 2 H2 + O2
decomposition reaction
What are the possible charge(s) for zinc?
What do phase notations show?
the phase or state of reaction components
What side of the reaction arrow are products located?
Right side of the reaction arrow
What happens in a synthesis (combination) reaction?
two (or more) reactants combine
Classify this reaction: CaO + H2O --> Ca(OH)2
synthesis (combination) reaction
What are the possible charge(s) for iron?
Fe2+ or Fe3+
s
solid
Coefficients
show the ratio of compounds reacting and forming
What happens in a decomposition reaction?
one reactant forms two (or more) products
Classify this reaction: CaCO3 --> CaO + CO2
decomposition reaction
Cu2+ or Cu+
l
liquid
Subscripts
show the number of atoms for each molecule or formula unit
What happens in a single displacement reaction?
one element replaces another element
Classify this reaction: Ca + 2 HBr --> CaBr2 + H2
single displacement reaction
What are the possible charge(s) for chromium?
Cr3+ or Cr2+
g
gas
Balanced equations
in balanced equations, the number of each atom are the same on both sides of the reaction arrow
What happens in a double displacement reaction?
two compounds rearrange, forming two new compounds
Classify this reaction: MgBr2 + Pb(ClO4)2 --> PbBr2 + Mg(ClO4)2
double displacement reaction
Co3+ or Co2+
aq
aqueous solution (dissolved in water)