The effect of pH on the rate of an enzyme reaction: plan
I can write a testable prediction and plan an investigation into the effect of changing pH on the rate of an enzyme reaction.
- Year 10
- AQA
The effect of pH on the rate of an enzyme reaction: plan
I can write a testable prediction and plan an investigation into the effect of changing pH on the rate of an enzyme reaction.
Lesson details
Key learning points
- Planning an investigation into the effect of pH on the rate at which amylase enzyme breaks down starch into maltose
- Writing an aim for the investigation, and a testable prediction
- Identifying independent and dependent variables, and which factors to control
- Planning a method, to include use of iodine in continuous sampling to indicate when all starch has been broken down
- Identifying hazards and risks, and how to limit them
Keywords
PH - A measure of how acidic or alkaline a solution is.
Rate of reaction - How fast a chemical reaction occurs.
Starch - A carbohydrate, which is a polysaccharide (a polymer of sugar).
Amylase - An enzyme that breaks down starch into maltose (a type of sugar).
Continuous sampling - A method that involves taking regular and frequent samples.
Common misconception
Misconceptions mixing aim and prediction or leaving them vague, writing a method which is unclear, and analysing hazards and their risks.
Approaches for stating aims and predictions, writing a method and dealing with variables, and analysing hazards and their risk are all covered with examples and practice tasks.
Equipment
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following is starch made from?
Q2.Which of the following is an enzyme?
Q3.Which of the following can the pH of a substance tell us?
Q4.What substance does iodine test for the presence of?
Q5.Which of the following can be used to calculate the rate of a reaction?
Q6.Which of the following describes the meaning of continuous sampling in the context of an experiment?
Assessment exit quiz
6 Questions
Q1.What does the enzyme amylase break down starch into?
Q2.A pupil investigates the effect of pH on the rate of amylase activity as it digests starch into maltose.
Which of the following is the independent variable in this investigation?
Q3.Match the key words to their definitions.
Q4.A is a statement of what we expect to happen in an experiment
Q5.When testing a food sample for the presence of starch, how do you know when all of the starch has been broken down?
