Chemical Reactions & Moles Flashcards
Activation energy
The energy needed to start a chemical reaction
Breaking chemical bonds
Requires energy
Building chemical bonds
Releases energy
Exothermic reaction
The reactants are at a higher energy state than the products, so energy is released.
Exergonic reaction
A reaction that releases energy as light instead of heat (exothermic)
Endothermic reaction
Reactants are at a lower energy state than the products, so energy is absorbed
Combination reaction
A reaction in which two or more reactants create one product
2Na + Cl2 –> 2 NaCl
Decomposition reaction
A reaction in which one reactant breaks down into two or more products
2 H2O –> 2H2 + O2
Single displacement reaction
A more reactive element replaces a less active element in a compound
Zn + CuSO4 –> ZnSO4 + Cu
Double displacement reaction
Reaction which two species are replaced
KCl +AgNO3 –> AgCl + KNO3
Neutralization reaction
A type of double displacement reaction in which water is formed. Usually a reaction between acids and bases.
H2SO4 + 2 NAOH →Na2SO4 + 2H2O
Combustion reaction
A reaction that produces heat usually by combining a carbon compound and oxygen.
C3H8 + 5 O3 →3 CO2 + 4 H2O
Redox reaction
A reaction which electrons are exchanged
2 Na + Cl2 → 2 NaCl
C + O2 –> CO2
Balancing equations tip
Balance oxygen and hydrogen last do other elements first
Avagadro’s number
6.022x10^23 atoms in 1 mole of substance
1 mole = the atomic mass (g) of an element
Ex) 1mol O = 16g O
