Changes Of State And Specific Latent Heat (GCSE Physics)

A heater supplies 2 000 J/s to a kettle for 30 s. If 0.1 kg of water evaporates during this time, what is the experimental value of the latent heat of vaporisation (Lv) calculated from these data?

Why does evaporation cool a liquid?

When steam at 100 °C condenses on skin, why can it cause more severe burns than water at 100 °C?

A liquid with a low latent heat of vaporisation will:

A student finds the energy required to melt 0.2 kg of aluminium is 6.84 × 10^4 J. What latent heat of fusion did they calculate for aluminium?

A student uses a joulemeter and measures voltage, current and time to find energy input to boil water. Which result will most affect the uncertainty in a calculated latent heat value?

A student heating ice measures time to melt under different insulating lids. They keep same mass of ice and same heater power. Which of these is a valid conclusion?

In a cooling experiment a student reports the time for a fixed temperature drop. Which factor would be a control variable to make the test fair?

Which experimental error most directly affects the accuracy of a measured latent heat of vaporisation using mass loss and heater energy?

A metal block of mass 2.0 kg requires 16 000 J to increase its temperature by 10 °C. What is the specific heat capacity of the metal?

Which of the following best describes specific latent heat?