Concentration and rate: practical using gas collection method
Lesson details
Learning outcome
I can carry out a fair test to investigate how the rate of reaction depends on the concentration of a reacting solution.
Key learning points
- The changing rate of a reaction can be found by measuring the amount of gas produced as the reaction progresses.
- Increasing concentration of a reacting solution introduces more reactant particles, so they collide more frequently.
- When reacting excess acid with equal amounts of magnesium, the same volume is produced for all concentrations of acid.
Keywords
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.
Independent variable - The independent variable is the single variable that is changed in an investigation.
Dependent variable - The dependent variable is the single variable that is measured or observed in an investigation.
Control variables - The control variables are variables that are kept constant in an investigation.
Common misconception
Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced.
The slide deck uses graphical data to show that the same volume of gas is produced when different concentrations are used, so long as the reacting solution is in excess.
Teacher tip
To highlight to pupils that when we use magnesium strips of the same length we are assuming we have the same mass.
Equipment
Conical flask, bung and delivery tube, water trough, measuring cylinder, timer, magnesium strips, different concentrations of hydrochloric acid and eye protection.
Content guidance
Risk assessment required - equipment
Supervision
Adult supervision required
Licence
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.How can we increase the rate of a reaction?
Q2.According to the collision theory, what must happen for a reaction to occur?
Q3.Which equipment can be used to measure the volume of gas in a rate of reaction investigation?
Q4.The rate of reaction can be defined as:
Q5.If 10 grams of a reactant are used up in 5 seconds, what is the rate of reaction?
Q6.What is activation energy?
Assessment exit quiz
6 Questions
Q1.What does a graph of volume of gas produced against time show?
Q2.What is a common error when using a measuring cylinder to measure the amount of gas produced during a reaction?
Q3.Why does increasing the concentration of a reacting solution increase the rate of reaction?
Q4.Why does increasing the concentration of a solution increase the frequency of particle collisions?
Q5.When reacting excess acid with equal amounts of magnesium, how does the concentration of acid affect the volume of gas produced?
Q6.To ensure a fair test when investigating how concentration affects rate of reaction, which of the following must be kept constant?
To help you plan your 11 combined science lesson on: Concentration and rate: practical using gas collection method, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 11 combined science lesson on: Concentration and rate: practical using gas collection method, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 4 combined science lessons from the Rate of reaction unit, dive into the full secondary combined science curriculum, or learn more about lesson planning.