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4.1.5Energy Resources and Energy Transfers

Core Practical- Investigating Thermal Energy — Edexcel International GCSE Science Double Award 4SD0 - Physics Revision Notes & Topical Questions

5 min read 5 parts Lesson 7 of 15

📚 Edexcel International GCSE Science Double Award 4SD0 - Physics Hub / Topical Revision
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Curriculum Equation Key قوانين الرقم الهيدروجيني والاتزان الأيوني - pH & Acid-Base Equilibrium FormulasFast Exam Solution
pH = -log[H⁺] | pOH = -log[OH⁻] | pH + pOH = 14 | [H⁺][OH⁻] = 10⁻¹⁴
Word Equation & Conditions: الرقم الهيدروجيني = -لوغاريتم تركيز أيون الهيدروجين | pH + pOH = 14
Location & Specifications: الاتزان الأيوني، كيمياء 3 ثانوي، التحصيلي، و AP Chemistry.
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Section 1 of 5Planning the Investigation

A fair test changes only one factor, so the other factors must be kept the same.

Independent variable
  • Independent variable The factor deliberately changed, here the colour or surface finish of each container.
Dependent variable
  • Dependent variable The quantity measured, here the temperature of the water recorded at fixed time intervals.
Control variables
  • Control variables Factors kept the same, such as the volume and starting temperature of the water and the room conditions.
Repeats
  • Repeats Repeating the investigation and averaging the results improves reliability and reduces random error.

Section 2 of 5Method

Use identical containers so that only the surface changes between them.

1
Set up identical containers, one with each surface or colour, and fill each with the same volume of hot water.
2
Place a lid with a thermometer in each container, with the bulb in the water and not touching the base.
3
Record the starting temperature of the water in each container at time zero, using a stopwatch to time the readings.
4
Take a temperature reading every minute for a set time, keeping the room and the water volume constant throughout.
5
Plot temperature against time on the same axes for each container and compare the gradients of the curves.

Section 3 of 5Analysis and Evaluation

Good analysis compares the curves fairly and explains any differences in terms of energy transfer.

Analysis and Evaluation
Steeper gradient
  • Steeper gradient A steeper temperature-time curve means thermal energy is transferred to the surroundings more quickly.
Anomalies
  • Anomalies Identify and remove readings that clearly do not fit the trend before drawing the line of best fit.
Limitations
  • Limitations A thermometer reads to about 1 °C, which limits how precisely small differences can be measured.
Improvements
  • Improvements Use a lid with a small hole and insulation around the sides to reduce heat loss from the top and sides.

Section 4 of 5Worked Example

Question Describe how to decide which container loses thermal energy fastest, using the temperature-time graphs.

  1. Plot the temperature of each container against time on the same graph.
  2. Compare the gradient of each curve at the same time, for example at 5 minutes.
  3. The container with the steepest falling line loses energy to its surroundings fastest.

Answer The container with the steepest falling curve loses energy most quickly, so its surface is the poorest insulator of the set.

Section 5 of 5Exam Checklist & Tips

4.1.5 – Key Points for the Exam

  • Independent variable The factor the investigator deliberately changes.
  • Dependent variable The quantity measured, which may change as a result of the independent variable.
  • Control variable A factor kept the same so that the test stays fair.
  • Anomalous result A reading that does not fit the pattern of the other readings and is removed from analysis.
  • Line of best fit A smooth line that follows the overall trend of the data and passes close to most points.

Common Mistakes

  • Letting the thermometer touch the base of the container, which gives a reading of the container rather than the water.
  • Changing the volume of water between containers, which is a control variable and makes the comparison unfair.
  • Joining points with a line that passes through anomalies instead of drawing a smooth line of best fit.
  • Recording results without units or with a precision finer than the thermometer can actually read.

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