A student determined the specific latent heat of vaporisation of ethanol.
What measuring instrument should the student have used to measure the mass of the ethanol? (options: balance, joulemeter, newtonmeter, thermometer)
The room temperature stayed the same throughout the experiment. What type of variable was the room temperature? (options: Categoric variable, Control variable, Dependent variable, Independent variable)
Ethanol is highly flammable. Give one safety precaution the student should take when heating the ethanol.
The mass of ethanol that turned into vapor was 0.0125 kg0.0125\text{ kg}0.0125 kg. The heater transferred 10 500 J10\,500\text{ J}10500 J of energy to the ethanol to turn it into vapor. Calculate the specific latent heat of vaporisation of ethanol given by the student's data. Choose the unit from the box: J\text{J}J, kg\text{kg}kg, J/kg\text{J/kg}J/kg.
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 ethanol, The transfer of thermal energy from the heater to the ethanol, The transfer of thermal energy from the ethanol to the heater, The transfer of thermal energy from the hot ethanol/beaker to the surroundings)