Questions 1. Explain why the experiments can give only approximate values for the specific latent heat of fusion of water and the specific latent heat of vaporisation of water?

2. An electric kettle which is rated at 2250 W contains 0.8 kg of water. It takes 150 s to heat the water from 10°C to 100°C. The specific heat capacity of water is 4200 J kg−1 K−1.
a Calculate:
i the heat energy produced by the kettle in this time

ii the heat taken in by the water in this time.

b Suggest two reasons for the difference between these two quantities.

it takes about 30 days for it to break down

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.