RXN

• General Chemistry Topics


  • Reaction Rates
  • Collision Theory
  • Conditions that Affect Reaction Rates
  • Chemical Equilibrium
• Reaction Rates


  Reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation
• Collision Theory


  States that for a chemical reaction to occur, the reacting particles must collide with one another
• Conditions that Affect Reaction Rates

  • Concentration
  • Surface Area
  • Temperature
  • Catalyst
• Balancing Chemical Equations


  1. Count the atoms in each side

  2. Change the coefficient of one of the substances

  3. Count the numbers of atoms again and, from there, repeat steps two and three until you've balanced the equation
• Balanced Chemical Equations


  • Mg + Cl2 → MgCl2
  • N2 + H2 → NH3
• Percent by Mass


  Concentration expressed by percent by mass is a ratio of a measured amount of solute to a measured amount of solution
• Solving Percent by Mass Problems


  1. Identify the given and unknown

  2. Use the formula

  3. Plug in the values and solve
• Percent by Volume


  Percent by volume usually describes solutions in which both solute and solvents are liquids
• Chemical Equilibrium


  Many chemical reactions do not go to completion. Instead, they reach a state of chemical equilibrium where there is no change in the concentrations of reactants and products
• Chemical Equation


  Represents what happens in a chemical reaction at the microscopic level. A balanced chemical equation conveys qualitative and quantitative information
• Concepts Related to Chemical Equations

  • Limiting Reactant
  • Excess Reactant
  • Theoretical Yield
  • Actual Yield
  • Percent Yield