Chemical Equations
What is the difference between reactants and products?
Reactants are on the left side of the equation
Products are on the right side of the equation
What type of reaction is this?
Na + Cl --> NaCl
Synthesis
What does "redox" stand for?
Oxidation-Reduction
Balance the following equation.
CH4 + Cl2 --> CCl4 + HCl
CH4 + 4 Cl2 --> CCl4 + 4 HCl
List the 4 different phases of matter located in a chemical equation.
Solid (s), Liquid (l), Gas (g), Aqueous (aq)
What type of reaction is this?
Zn + HCl --> ZnCl2 + H2
Single displacement
What is the first step in balancing a redox reaction?
Split into two half-reactions
Balance the following equation.
C7H16 + O2 --> CO2 + H2O
C7H16 + 11 O2 --> 7 CO2 + 8 H2O
What purpose do coefficients and subscripts serve in a chemical equation?
Coefficients = tells number of atoms/molecules
Subscripts = tells the ratio of atoms/molecules
Name the 6 types of chemical reactions.
Synthesis, decomposition, single displacement, double displacement, combustion, redox
Which two things must be balanced in order for a redox reaction to be balanced?
Number of atoms/molecules of reactants vs. products
Overall charge of reactants vs. products
Balance the following equation.
C8H18 + O2 --> CO2 + H2O
2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
Describe what it means for a substance to be aqueous.
Substance has been dissolved in water
Which two products are always formed as a result of a combustion reaction?
CO2 and H2O
Define what it means for a substance to be "oxidized" and "reduced".
Oxidized = substance is losing electrons
Reduced = substance is gaining electrons
Balance the following equation.
Cu + Fe3+ --> Cu2+ + Fe2+
Cu + 2 Fe3+ --> Cu2+ + 2 Fe2+
Define and explain the Law of Conservation of Matter.
Matter cannot be created or destroyed.
Number of atoms/molecules in the reactants must be equal to the number of atoms/molecules in the products.
Name the 7 elements that naturally appear as diatomic molecules.
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
H2, N2, O2, F2, Cl2, Br2, I2
Which substance is being reduced?
Sn2+ + Fe3+ --> Sn4+ + Fe2+
Iron (Fe)
Balance the following equation.
S2- + Cl2 --> S2 + Cl-
2 S2- + 2 Cl2 --> S2 + 4 Cl-
Balance the following equation.
Fe3+ + Hg22+ --> Fe2+ + Hg2+
2 Fe3+ + Hg22+ --> 2 Fe2+ + 2 Hg2+