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 two equations can be used to measure the rate of reaction?

  Reactants used over time or products formed over time
• If 180 cm cubed of hydrogen is produced in 2 minutes, what is the rate?

  1.5 cm cubed per second
• How do you convert 2 minutes into seconds?

  120 seconds
• If 3 g of magnesium takes 4 minutes to disappear, what is the rate?

  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 represented graphically?

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

  It starts high and decreases over time
• What happens to the volume of hydrogen produced in a reaction graph?

  It starts at zero and increases rapidly
• 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 units can be used to express reaction rates?

  • Grams per second
  • cm cubed per second
  • Moles per second
  • Decimet cubed per second
• What will the next video cover regarding reaction rates?

  Calculating the rate at a specific time
• What should you do if you enjoyed the video?

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