A measure of how acidic or alkaline a solution is.

A carbohydrate, which is a polysaccharide (a polymer of sugar).

An enzyme that breaks down starch into maltose (a type of sugar).

A method that involves taking regular and frequent samples.

The effect of pH on the rate of an enzyme reaction: plan

Combined science

Pupils will learn how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of the human body.

Pupils learned about differences in the cell structures of eukaryotic and prokaryotic organisms.

Biological molecules and enzymes

What does the enzyme amylase break down starch into?

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?

an action taken to reduce the potential for harm

Match the key words to their definitions.

A {{}} is a statement of what we expect to happen in an experiment

The colour of the iodine solution changes to blue–black.

The colour of the iodine solution changes from black to blue.

The colour of the iodine solution changes from blue to black.

The colour of the iodine solution does not change to blue–black.

When testing a food sample for the presence of starch, how do you know when all of the starch has been broken down? 

A pupil investigates the effect of pH on the rate of amylase activity as it digests starch into maltose. 
Which of the following are control variables in this investigation?

Which of the following is starch made from?

Which of the following can the pH of a substance tell us?

What substance does iodine test for the presence of?

Which of the following can be used to calculate the rate of a reaction?

Readings are taken at the start and end of an experiment.

A reading is taken at the end of an experiment.

A reading is taken at the start of an experiment.

Readings are taken at regular intervals throughout an experiment. 

Which of the following describes the meaning of continuous sampling in the context of an experiment?

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