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 chemical reaction?

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

  Explosions like fireworks
• What is the equation for the rate of reaction based on reactants used?

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

  Rate = quantity of products formed / time
• In what units are quantities typically measured for reaction rates?

  Grams or cm cubed
• If 180 cm cubed of hydrogen is produced in 2 minutes, what is the rate?

  1.5 cm cubed per second
• 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 rates throughout the entire reaction
• How does the rate of reaction change over time?

  • Starts fast with many reactants
  • Slows down as reactants are used up
• What does the x-axis represent in reaction rate graphs?

  Time
• What does the y-axis represent in reaction rate graphs?

  Mass of reactant or volume of product
• What happens to the mass of magnesium in a reaction graph?

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

  It starts at zero and increases quickly
• 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 are the different units that can be used for measuring reaction rates?

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

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

  Like and subscribe
• What is the difference between average and instantaneous rates of reaction?

  Average rates are over the entire reaction
• Why is it important to convert time units in calculations?

  To ensure accurate rate calculations
• Why do we plot graphs for reaction rates?

  • To visualize changes over time
  • To analyze the speed of reactions
• How does reactant concentration affect reaction rates?

  Higher concentration increases reaction rates
• What effect does temperature have on reaction rates?

  Higher temperature increases reaction rates
• What is the role of catalysts in chemical reactions?

  They speed up reactions without being consumed
• What is activation energy in chemical reactions?

  The minimum energy needed for a reaction
• How does surface area affect reaction rates?

  Larger surface area increases reaction rates
• How does pressure influence gas reactions and their rates?

  Higher pressure increases reaction rates