How does the change in temperature affect the rate of reaction?

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Temperature affecting Reaction Rates

  • Guiding Question: How does the change in temperature affect the rate of reaction?

  • Objectives: The objective of this experiment is to see how temperature affects reaction rates.

  • Hypothesis: We think that temperature increases the rate of reaction because the increase in temperature increases the energy of the particles and therefore overcomes faster the activation energy.

  • Variables:
  1. Independent: Temperature (°C)
  2. Dependents: Time (s) and rate of reaction (s -1)
  3. Control: Volume (ml) and concentration (M) of HCl and Na2S2O3.
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  • Procedure:
  1. Transfer 50 ml 0.0400 M sodium thiosulfate solution into a 50 ml flask.
  2. With a marker make a black cross in a paper and put it below the flask.
  3. At room temperature quickly pour 5ml HCl of a 2M solution
  4. Measure the time needed for the black cross to disappeared.
  5. Repeat this procedure and then place the flask in a hot plate using a thermometer and vary the temperature to 30 °C, 40 °C, 50 °C and 60 °C.
  6. Repeat the experiment twice for each temperature and find the average.

  • Materials: ...

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