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Chemical Reactions Investigation

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Chemical Reactions Investigation

A science team is testing whether water temperature changes how quickly an effervescent tablet reacts. Use the investigation plan and results below to analyse the evidence. Do not taste chemicals. If carrying out this investigation in class, follow your teacher’s instructions, wear safety glasses and use small quantities.

Investigation plan

A student places 200 mL of water in each of three identical beakers. The water temperatures are 10°C, 25°C and 40°C. One tablet from the same packet is added to each beaker. The student times how long it takes for bubbling to stop. Each condition is tested three times. The same beaker size, water volume and tablet type are used each time.

Water temperature

Trial 1

Trial 2

Trial 3

10°C

96 s

102 s

99 s

25°C

54 s

57 s

55 s

40°C

28 s

31 s

29 s

1.In this investigation, identify the independent variable, the dependent variable and one controlled variable.

2.Which prediction best matches collision theory for this test?

The tablet should react fastest in warmer water because particles move faster and collide more often.
The tablet should react fastest in colder water because particles move more slowly.
Water temperature cannot affect reaction rate.

3.Calculate the mean time for the three trials at 25°C. Show your working and give the answer in seconds.

4.Compare the mean times at 10°C and 40°C. Describe the relationship between water temperature and the time taken for bubbling to stop.

5.Which temperature produced the fastest reaction? Use a result from the table to support your answer.

6.The three trials at 10°C are close together, which suggests the results at that temperature are reasonably repeatable.

TrueFalse

7.Explain why the tablet reacts more quickly in warmer water, using the ideas of particle motion and successful collisions.

8.The plan controls water volume and tablet type. Name one more factor the student should keep the same to make the comparison fair, and explain why.

9.Suggest one change that could improve the reliability of the results, and explain how it would help.

10.Give one sensible safety precaution for this investigation and explain what risk it reduces.

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Chemical Reactions Investigation

Chemical Reactions Investigation

Investigation plan

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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