C7.1.1 PAG1: Measuring Rates of Reaction

• Higher concentration increases reaction rate.


  True
• Catalysts speed up reactions without being used
• Why do catalysts speed up reactions without being consumed?

  They lower activation energy
• Match the factor with its effect on reaction rate:

  Concentration ↔️ Higher concentration increases rate

  Temperature ↔️ Higher temperature increases rate

  Surface Area ↔️ Larger surface area increases rate

  Catalysts ↔️ Speed up reactions without being consumed
• What is the primary reaction being measured in the example experiment to study reaction rate?

  HCl and marble chips
• Match the technique with its description:

  Timing the reaction ↔️ Record time for reaction to reach a certain point

  Measuring mass changes ↔️ Weigh reactants before and after

  Monitoring gas production ↔️ Measure volume or rate of gas produced
• Repeating experiments ensures consistent results
• One technique for measuring reaction rate involves timing the reaction until all reactants are consumed.
• Repeating experiments is important to ensure consistent results when measuring reaction rates.


  True
• A higher concentration of reactants leads to a faster reaction rate.
• A larger surface area of reactants increases the reaction rate.


  True
• What is the effect of higher concentration on reaction rate?

  Increases the reaction rate
• Catalysts are not consumed during a chemical reaction.
• Steps to set up an experiment to measure reaction rate

  1️⃣ Choose a chemical reaction

  2️⃣ Control variables

  3️⃣ Measure reaction rate

  4️⃣ Repeat and analyze
• One method to measure reaction rate is by recording the time taken for the reaction to reach a certain point.
• What is the final step in measuring reaction rate in an experiment?

  Repeat and analyze
• Controlling variables is essential when measuring reaction rate to isolate the effect of one variable at a time.


  True
• What is another method to measure reaction rate by measuring mass changes?

  Weigh reactants before and after
• When measuring the effect of HCl concentration on reaction rate, you must keep temperature, surface area, and catalysts constant
• What does the technique "Timing the reaction" involve in measuring reaction rate?

  Recording time for completion
• Repeating experiments reduces the impact of random errors on reaction rate measurements.

  True
• The formula for calculating reaction rate is: Reaction rate = Change in amount of product / Time taken for reaction
• What is the typical effect of increasing concentration on reaction rate?

  Increases reaction rate
• What happens to reaction time when HCl concentration is increased in the reaction with marble chips?

  Reaction time decreases
• What is one method to reduce the impact of random errors in reaction rate measurements?

  Repeat trials and average
• What is the reaction rate in chemistry?

  The speed of reaction
• How does temperature affect reaction rate?

  Higher temperature increases it
• What is the effect of surface area on reaction rate?

  Larger surface area increases it
• Higher concentration always increases reaction rate.


  True
• Steps to set up an experiment to measure reaction rate:

  1️⃣ Choose a chemical reaction

  2️⃣ Control variables

  3️⃣ Measure reaction rate

  4️⃣ Repeat and analyze
• One method to measure reaction rate is to time the reaction
• A graph of HCl concentration vs. reaction time shows the relationship between concentration and reaction rate.

  True
• Why is it crucial to collect data and record observations carefully when measuring the rate of a chemical reaction?

  To analyze reaction rate effects
• What does measuring mass changes involve when determining reaction rate?

  Weighing reactants before and after
• What is the definition of reaction rate?

  How quickly a reaction occurs
• How does temperature affect reaction rate?

  Higher temperature increases rate
• Catalysts speed up reactions without being used up.
• Higher temperature always leads to a slower reaction rate.

  False
• Why is understanding the factors affecting reaction rates crucial in chemistry?

  For designing and optimizing processes
• What is a suitable example of a chemical reaction for measuring reaction rate in an experiment?

  Hydrochloric acid and marble chips