Internal energy and energy transfers

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Question 5
Easy

A student carried out an experiment to determine the specific latent heat of vaporisation of acetone.

a.

What measuring instrument should the student have used to measure the mass of the acetone?

Options: balance, force meter, thermometer, voltmeter

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b.

The atmospheric pressure in the laboratory stayed the same throughout the experiment. What type of variable was the atmospheric pressure?

Options: Categoric variable, Control variable, Dependent variable, Independent variable

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c.

Acetone is highly flammable. Give one safety precaution the student should take when heating the acetone.

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d.

The mass of acetone that turned into vapor was 0.0240 kg. The heater transferred 12 480 J12\,480\text{ J}12480 J of thermal energy to the acetone to turn it into vapor. Calculate the specific latent heat of vaporisation of acetone given by the student's data.

Choose the unit from the list: J\text{J}J, kg\text{kg}kg, J/kg\text{J/kg}J/kg.

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e.

What was a source of unintended energy transfer (error) in the student's experiment?

Options:

  • The transfer of thermal energy from the surroundings to the acetone
  • The transfer of thermal energy from the heater to the acetone
  • The transfer of thermal energy from the acetone to the heater
  • The transfer of thermal energy from the hot acetone/beaker to the surroundings
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Internal energy and energy transfers Questions

  1. GCSE
  2. /Physics
  3. /Internal energy and energy transfers