Iodine Clock Reaction (AQA A-Level Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What colour does the reaction mixture turn when all thiosulfate has been consumed?
What colour does the reaction mixture turn when all thiosulfate has been consumed?
Blue-black
What is the role of thiosulfate ions in the iodine clock reaction?
What is the role of thiosulfate ions in the iodine clock reaction?
React with as it forms
What volume of hydrogen peroxide should be transferred into the 100 cm³ beaker?
What volume of hydrogen peroxide should be transferred into the 100 cm³ beaker?
10.0 cm³
When should the timer be started in the iodine clock reaction?
When should the timer be started in the iodine clock reaction?
When is added
How many experiments should be performed in total, varying potassium iodide concentration?
How many experiments should be performed in total, varying potassium iodide concentration?
Five
What should be plotted on the y-axis to determine reaction order with respect to iodide ions?
What should be plotted on the y-axis to determine reaction order with respect to iodide ions?
Initial rate (1/time)
What improvement can be made to minimise human error in timing the colour change?
What improvement can be made to minimise human error in timing the colour change?
Use a colourimeter
Why is the initial rate method preferable for this reaction?
Why is the initial rate method preferable for this reaction?
Concentrations known at start
What is the reaction order if one reactant is in large excess?
What is the reaction order if one reactant is in large excess?
Zero
What property does a colourimeter measure that is proportional to iodine concentration?
What property does a colourimeter measure that is proportional to iodine concentration?
Absorbance