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Reaction Rate Investigation

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Reaction Rate Investigation

A science club wants to make a vinegar-and-baking-soda reaction fizz quickly and fairly. Use the results below to work out how temperature affects the reaction rate. A shorter time to start fizzing means a faster reaction. You can investigate the ideas on paper; do not mix or heat anything.

The investigation

For each trial, the science club used the same amount of vinegar and baking soda, the same-sized cup, and the same method. They changed only the vinegar temperature. They timed how many seconds passed before fizzing began. Each temperature was tested three times.

Vinegar temperature

Trial 1

Trial 2

Trial 3

Cold (5°C)

18

17

19

Room temperature (20°C)

11

10

12

Warm (35°C)

6

7

5

Plan and interpret

Use the results grid to answer the questions. Think about what was changed, what was measured, and what needed to stay the same for a fair test.

1.Based on the investigation question—how temperature affects reaction rate—predict which vinegar temperature you think will make fizzing begin fastest. Give one reason for your prediction, without using the results.
2.Which factor did the club deliberately change between the three sets of trials?
  • The liquid's warmth
  • The amount of baking soda
  • The size of the cup
  • The timing method
3.Name one factor the club kept the same to make this a fair test.
4.Calculate the mean time for the cold vinegar trials. Add the three times and divide by 3.
5.Calculate the mean time for the warm vinegar trials. Add the three times and divide by 3.
6.Which temperature had the fastest reaction? Use the results to explain how you know.
7.True or false: The results suggest that making the liquid warmer made fizzing begin sooner in this investigation.
TrueFalse
8.The club wants to test whether stronger vinegar makes the reaction faster. What should they change, and name one thing they should keep the same?
9.Suggest one way to improve the reliability of the temperature investigation, and explain how it would help.

2 printable pages

  • Reaction Rate Investigation, page 1 of 2: The investigation, Plan and interpret

    Page 1

  • Reaction Rate Investigation, page 2 of 2: 3. Name one factor the club kept the same to make this a fair test.

    Page 2

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