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Chemical Reactions

Review of the parts of a chemical reaction

QuestionAnswer
starting material in a chemical reaction reactants
ending material in a chemical reaction products
speeds up chemical reactions catalyst
CxHy + O2 --> CO2 + H2O combustion reaction
AB --> A + B decomposition reaction
A + B --> AB synthesis reaction
AB + CD --> AD + CB double replacement reaction
AB + C --> CB + A single replacement reaction
numbers that are added to balance a chemical equation coefficients
numbers NEVER changed to balance a chemical equation subscripts
chemical equation that does not have equal # of atoms on both sides skeleton equation
chemical equation that does have equal # of atoms on both sides balanced equation
gas formed, transfer of energy, color change, precipitate forms clues of chemical change
means yields ; shows that chemical reaction is NOT reversible single arrow
Double replacement reactions happen this % of the time 100%
solid made from mixing liquids precipitate
means yields ; shows that chemical reaction goes in both direction double arrows
happens when products and reactants are formed at same rate equilibrium
law of conservation of mass states that mass is not created or destroyed in a chemical reaction
law of conservation of energy states that energy is not created or destroyed in a chemical reaction
monatomic means 1 atom ; is true for most elements
diatomic means 2 atoms ; H , N, O , F , Cl , Br, I
tetratomic means 4 atoms ; P & As
octatomic means 8 atoms ; S & Se
polyatomic means many atoms
Avogadro's number 6.02 x 10^23 representative particles
mole SI unit for amount of substance
Created by: cadetjt