Measuring Rates of Reaction From a Graph

This lesson covers:

  1. How to calculate the mean rate of reaction from a graph
  2. How to calculate the rate of reaction at a specific time from a graph

Mg + 2HCl ➔ MgCl+ H2


1.5 g of magnesium takes 4 minutes to react completely. Calculate the mean rate of reaction. Give your answer in g/min.

0.375

g/min

g/min

0

/

1

Graph showing volume of product produced over time in seconds for a reaction.

Using the above graph, what is the mean rate of reaction in the first 30 seconds?

Give your answer in cm3/s

0.2

cm3/s

cm3/s

0

/

1

Graph showing the mass of reactant in grams over time in seconds for a chemical reaction.

Using the above graph, what is the mean rate of reaction in the first 20 seconds?

Give your answer in g/s.

0.075

g/s

g/s

0

/

1

Which of the following is the equation to calculate the gradient?

change in ychange in x\frac{change\ in\ y}{change\ in\ x}

change in xchange in y\frac{change\ in\ x}{change\ in\ y}

0

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1

By finding the gradient of the tangent to a curve at a specific time, we can calculate the:

Rate of reaction at a specific time

Mean rate of reaction

0

/

1

During a chemical reaction, when is the rate normally fastest? 

At the start

In the middle

At the end

0

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1

Graph comparing the volume of product produced over time for two reactions, with the blue line indicating a faster reaction and the red line a slower reaction.

In the above graph, which of the following lines indicates a faster reaction?

Blue

Red

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1

The line is steepest at the start of a reaction because there are a lot of reactants.


Over time, the line becomes  steep as the reactants are used up.


At the end of the reaction, when all the reactants have been used up, the line p.

less
lateaus

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2