Required Practical: Decay (AQA GCSE Biology): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is being investigated in this decomposition practical?
What is being investigated in this decomposition practical?
Effect of temperature on decomposition rate
Which pH indicator is used in this practical?
Which pH indicator is used in this practical?
Phenolphthalein
What is the initial colour of the solution after adding sodium carbonate?
What is the initial colour of the solution after adding sodium carbonate?
Pink
Why is sodium carbonate added to the milk mixture?
Why is sodium carbonate added to the milk mixture?
To raise the pH and turn solution pink
What is the purpose of placing the test tube in a water bath?
What is the purpose of placing the test tube in a water bath?
To control the temperature of the reaction
What does lipase produce when it breaks down fats in milk?
What does lipase produce when it breaks down fats in milk?
Fatty acids
What does the disappearance of the pink colour indicate?
What does the disappearance of the pink colour indicate?
Solution has become acidic
What is measured as soon as the lipase is added?
What is measured as soon as the lipase is added?
Time for pink colour to disappear
How does decomposition rate change with temperature up to the optimum?
How does decomposition rate change with temperature up to the optimum?
Increases
What happens to the enzyme beyond its optimum temperature?
What happens to the enzyme beyond its optimum temperature?
It denatures
Which must be kept constant to ensure accurate results?
Which must be kept constant to ensure accurate results?
Lipase concentration, milk volume, sodium carbonate
In which fields is understanding decomposition rates crucial?
In which fields is understanding decomposition rates crucial?
Agriculture, waste management, food preservation