Calculating Rate of Reaction

• What is the formula for calculating the rate of reaction?

  Rate = change in concentration / time
• How do you calculate the rate of reaction if you know the change in concentration and time?

  Rate = change in concentration / time
• What unit is typically used to measure the rate of reaction?

  Mole per second
• If the concentration of a reactant decreases from 0.5 mol/L to 0.2 mol/L in 10 seconds, what is the rate of reaction?

  0.03 mol/L/s
• If a reaction takes 5 seconds to produce 0.1 mol of product, what is the rate of reaction?

  0.02 mol/s
• What does a steeper gradient on a concentration vs. time graph indicate about the rate of reaction?

  A faster reaction
• If the volume of gas produced in a reaction increases over time, how can you calculate the rate of reaction?

  Measure the change in volume over a specific time period
• If the rate of reaction increases when the temperature is raised, what is the most likely explanation?

  The reactants are moving faster, leading to more collisions
• In an experiment, if the rate of reaction doubles when the concentration of reactant A is doubled, what type of relationship exists between concentration and rate?

  Direct relationship
• What would happen to the rate of reaction if you increase the surface area of a solid reactant?

  The rate of reaction would increase
• Reactants


  A starting material in a chemical reaction
• Products


  Ending materials in a chemical reaction.
• rate of chemical reaction

  How fast the reactants are changed into products
• collision theory


  For a reaction to occur, the particles must collide, they must collide with the appropriate orientation, and they must collide with sufficient energy.
• units of seconds


  s
• units of volume of gas

  cm3
• units of solid mass

  g
• units of moles


  mol
• tangent


  a straight line that touches the outside of a curve
• gradient


  slope
• mean rate of reaction

  Quantity of reactant used or product formed / time