- 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.
- Balance chemical reactions based on conservation laws.
- Predict reaction products based on reaction type.
- Perform simple stoichiometric calculations (mole-mole conversions only).
- Perform stoichiometric calculations involving solids and liquids.
- Perform stoichiometric calculations involving gas at STP.
- Predict limiting reactants and theoretical yield.
- Empirically calculate percent yield.
- 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.
- 4a.1: Balancing Chemical Reactions
- 4a.2: Reaction types
- 4a.3: Predicting products based on reaction types
- 4a.4: Mole-to-mole reaction stoichiometry
- 4b.1: Stoichiometry practice worksheet (short)
- 4b.2: Stoichiometry: mass-mass conversions
- More stoichiometry (optional): mole-mole, more complicated
- 4b.3: Limiting reactant problems
- 4b.5: Gas stoichiometry (has answer key)
Projects & Labs
- Lab 4b.1: Ridiculously Informal Stoichiometry lab
- Lab 4b.2: Copper recycling (theoretical project)
- Lab 4b.3: Mole ratios in a copper-silver replacement reaction
- Lab 4b.4: Determining percentage yield
- Quiz 4a: Chemical reaction equations
- Quiz 4b: Stoichiometry
- Quiz 4c: Energy changes during reaction
- Test 4: Chemical Reactions