Liquid ethanol is vaporised to form ethanol vapor. Complete the sentences below using one of the following options:
- greater than
- less than
- the same as
- The distance between the particles in ethanol vapor is the distance between the particles in liquid ethanol.
- The density of ethanol vapor is the density of liquid ethanol.
The graph below shows how the temperature of the ethanol varied with time as it was heated.
- What is the name of the process that is taking place between points C and D?
- Give a reason for your answer.
A mass of 0.80 kg0.80\text{ kg}0.80 kg of liquid ethanol was turned into ethanol vapor. The specific latent heat of vaporisation of ethanol is 850 000 J/kg850\,000\text{ J/kg}850000 J/kg.
Calculate the thermal energy transferred to the ethanol to turn it into vapor.
Use the equation: thermal energy for a change of state=mass×specific latent heat\text{thermal energy for a change of state} = \text{mass} \times \text{specific latent heat}thermal energy for a change of state=mass×specific latent heat
The mass of the ethanol vapor was 0.80 kg0.80\text{ kg}0.80 kg and its volume was 0.50 m30.50\text{ m}^30.50 m3.
Calculate the density of the ethanol vapor.
Use the equation: density=massvolume\text{density} = \frac{\text{mass}}{\text{volume}}density=volumemass
Choose the unit from the following options: kg\text{kg}kg, m3/kg\text{m}^3\text{/kg}m3/kg, or kg/m3\text{kg/m}^3kg/m3.
Internal energy and energy transfers Questions
Practise AQA GCSE Physics Internal energy and energy transfers with exam-style questions for Foundation and Higher tier. 48 questions covering Internal energy, Temperature changes in a system and specific heat capacity, and Changes of state and specific latent heat, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.