Experimental methods for rate data Quiz
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5 questions, one answer each
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1. Which technique is most suitable for following the reaction of calcium carbonate with hydrochloric acid, which produces carbon dioxide?
- A. Titration without quenching
- B. Colorimetry
- C. Measuring the loss in mass of the flask
- D. Measuring the pH of the solution only at the end
2. In an iodine clock experiment, the time to the colour change doubles. What has happened to the initial rate?
- A. It doubles
- B. It halves
- C. It stays the same
- D. It increases fourfold
3. What is the purpose of adding excess sodium hydrogencarbonate to a sample in the iodine–propanone titration?
- A. To react with the thiosulfate
- B. To act as an indicator
- C. To increase the rate
- D. To neutralise the acid catalyst and stop the reaction
4. An orange-brown solution is analysed in a colorimeter. Why is a blue filter used?
- A. Blue light is absorbed most strongly by the solution
- B. Blue light is transmitted most strongly by the solution
- C. Blue is the colour of the solution
- D. Blue filters reduce the temperature
5. Which graph shows the reaction is zero order with respect to iodine in the iodine–propanone reaction?
- A. Concentration of iodine against time is a curve with a constant half-life
- B. Concentration of iodine against time is a straight line with a negative gradient
- C. Rate against concentration is a straight line through the origin
- D. Rate against concentration is an upward curve