4. Chemical Reactions (22 lessons)

Concepts

  • Chemical reactions occur when atoms rearrange themselves into different bonds.
  • Many reactions can be categorized into six basic reaction types. We can use our knowledge of reaction types to predict what products a given set of reactants might produce.
  • Stoichiometry is a tool for theoretically calculating the amount of products/reactants involved in a reaction.
  • In most reactions not all reactants will react to completion because the amount of one reactant is limiting.
  • In a chemical reaction, mass, charge, atoms of each type, and subatomic particles of each type are conserved.
  • For two molecules to react, they must get very close together, which requires energy.  During a reaction, kinetic energy is transferred to potential energy; after the reaction, potential energy is transferred back to kinetic energy.
  • Reactions can be classified or either endothermic or exothermic based on net kinetic energy change.

Skills

Quiz 4a

  • Balance chemical reactions based on conservation laws.
  • Predict reaction products based on reaction type.
  • Perform simple stoichiometric calculations (mole-mole conversions only).

Quiz 4b

  • Perform stoichiometric calculations involving solids and liquids.
  • Perform stoichiometric calculations involving gas at STP.
  • Predict limiting reactants and theoretical yield.
  • Empirically calculate percent yield.

Quiz 4c

  • Describe energy changes in a reaction quantitatively and using a diagram.
  • Use the concept of bond enthalpy to calculate the energy change of a reaction.
  • Perform stoichiometric energy calculations.

Homework

Quiz 4a

Quiz 4b

Quiz 4c

Projects & Labs

Quiz 4a

Quiz 4b

Quiz 4c

Assessment

  • Quiz 4a: Chemical reaction equations
  • Quiz 4b: Stoichiometry
  • Quiz 4c: Energy changes during reaction
  • Test 4: Chemical Reactions