Rates of reaction

• What does the rate of chemical reactions refer to?

  The speed of reactants turning into products
• How can we measure the rate of a chemical reaction?

  By measuring reactants used or products formed
• What is an example of a slow reaction?

  Rusting of iron
• What is an example of a fast reaction?

  Explosions like fireworks
• What is the equation for the rate of reaction using reactants?

  Rate = quantity of reactants used / time
• What is the equation for the rate of reaction using products?

  Rate = quantity of products formed / time
• What units can be used to measure quantities in the rate of reaction?

  Grams or cm cubed
• How do you convert 2 minutes into seconds?

  2 minutes = 120 seconds
• What is the rate of hydrogen production if 180 cm cubed is produced in 2 minutes?

  1.5 cm cubed per second
• How do you calculate the rate if 3 G of magnesium is used in 4 minutes?

  0.0125 G per second
• What do the calculated rates of reaction represent?

  The average or mean rates throughout the reaction
• How does the rate of reaction change over time?

  • Starts fast with many reactants
  • Slows down as reactants are used up
• How can reaction rates be visualized graphically?

  • Time on x-axis
  • Mass of reactant or volume of product on y-axis
• What happens to the mass of magnesium over time in a reaction graph?

  It decreases rapidly then slows down
• What happens to the volume of hydrogen produced over time in a reaction graph?

  It starts at zero and increases quickly
• What other units can be used for measuring reaction rates?

  Moles or decimet cubed per second
• How do you calculate the rate in moles per minute if 0.6 moles of magnesium are used in 2 minutes?

  0.3 moles per minute
• What will be covered in the next video?

  • Calculating the rate of reaction at a specific time
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