Rate of reaction is the speed with which a chemical reaction takes place.

The mean rate of reaction is the average rate at which reactants are converted into products over a given period of time.

The instantaneous rate of reaction is the rate at which reactants are converted into products at a specific moment in time.

A tangent is a straight line that touches a curve at exactly one point without crossing it.

The gradient on a graph represents the rate at which one quantity changes relative to another.

The rate of a chemical reaction: including graphs

Combined science

In the Industrial Chemistry unit, pupils will build on their knowledge of reaction rates to learn about the industrial processes involving chemical reactions and the factors that affect them.

In the Energy Changes in Reactions unit, pupils learned about bond breaking, bond making, and reaction profiles.

This unit explores factors influencing reaction rates, including temperature, concentration, surface area, and catalysts. It covers using models and theories to develop hypotheses, planning and conducting experiments safely, selecting appropriate techniques, and presenting and translating data.

Rate of reaction

How do most chemical reactions progress over time?

the amount of product formed per unit time

the amount of reactant used per unit time

What is the rate of a chemical reaction equal to?

the rate in which reactants form products in a given period of time

the rate in which reactants form products at a specific moment in time

a straight line that touches a curve at exactly one point

represents the rate at which one quantity changes relative to another

Match the keywords with the correct definition.

it shows the total amount of reactant used

it helps find the instantaneous rate at a specific moment

it measures the temperature change over time

Why is drawing a tangent useful on a rate of reaction graph?

Which of the following can be plotted to represent the changing rate of a chemical reaction?

A chemical reaction produces 0.5 g of gas in 10 seconds. What is the correct rate of reaction?

Identify the products in this chemical reaction:            
magnesium + sulfuric acid → magnesium sulfate + hydrogen 

What do we call the speed with which a chemical reaction takes place?

Which of the following reactions has a relatively low rate of reaction?

divide the change in time by the change in volume

multiply the change in y-axis value by the change in x-axis value

divide the change in y-axis value by the change in x-axis value

add the change in y-axis value to the change in x-axis value

How do we calculate the gradient of a straight-line graph?

A graph shows the volume of gas produced (in cm³) over time (in seconds). If the graph has a straight line that rises from 0 cm³ at 0 seconds to 40 cm³ at 20 seconds, what is the gradient of the graph

reaction 1 produces 5 cm³ of gas in 10 seconds

reaction 2 produces 10 cm³ of gas in 20 seconds

reaction 3 produces 15 cm³ of gas in 30 seconds

reaction 4 produces 5 cm³ of gas in 20 seconds

Given the following data for four different reactions, which reaction has the lowest rate of reaction?

Starter Quiz