Calculating the Rate of Reaction

Identify the correct equation to calculate the rate of reaction.

• Rate of reaction = amount of products made ÷ time
• Rate of reaction = time ÷ amount of reactants used
• Rate of reaction = end time - start time
• Rate of reaction = amount of reactants made time ÷ time

A reaction makes 30 cm³ of gas, and finish after 45 seconds. 
Calculate the average rate of reaction to 2dp.

• 0.67 s/cm³
• 1.5 s/cm³
• 0.67 cm³/s
• 1.5 cm³/s

A reaction takes 90 seconds to finish. 
In 30 seconds 21 cm³ of gas is made.
In 60 seconds 38 cm³ of gas is made.
In 90 seconds 50 cm³ of gas is made.
Calculate the average rate of reaction.

• 0.56 cm³/s
• 0.73 cm³/s
• 0.63 cm³/s
• 1.21 cm³/s

A reaction takes 90 seconds to finish. 
In 30 seconds 21 cm³ of gas is made.
In 60 seconds 38 cm³ of gas is made.
In 90 seconds 50 cm³ of gas is made.
Calculate the rate of reaction between 0 and 30 seconds.

• 0.00 cm³/s
• 1.43 cm³/s
• 0.70 cm³/s
• other answer

A reaction takes 90 seconds to finish. 
In 30 seconds 21 cm³ of gas is made.
In 60 seconds 38 cm³ of gas is made.
In 90 seconds 50 cm³ of gas is made.
Calculate the rate of reaction between 30 and 60 seconds.

• 0.98 cm³/s
• 0.57 cm³/s
• 0.63 cm³/s
• other answer

A reaction takes 90 seconds to finish. 
In 30 seconds 21 cm³ of gas is made.
In 60 seconds 38 cm³ of gas is made.
In 90 seconds 50 cm³ of gas is made.
Identify the time period in which the rate of reaction is the fastest.

• Between 0 and 30 seconds
• Between 30 and 60 seconds
• Between 60 and 90 seconds
• Each time period has the same rate of reaction

^{Identify the part of the graph with the fastest rate of reaction.}

• A
• B
• C
• D

How long does it take for the reaction to finish?
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• 46 seconds
• 50 seconds
• 102 seconds
• Other

^{Identify where the reaction has finished.}

• A
• B
• C
• D

^{Order the letters from highest to lowest rate of reaction.}

• A > B > C > D
• A > BC > D (B and C have the same rate)
• A > B > CD (C and D have the same rate)
• D > C > B > A