measurement of the specific latent heat of vaporisation of water Flashcards
list two measurements that the student took before adding the steam to the water
the student measured the mass of the empty calorimeter, the calorimeter with water, and subtracts these to find the mass of the water
how did the student find the mass of steam that was added to the water?
by subtracting the mass of the calorimeter and water from the final mass of the calorimeter, water and condensed steam
how did the student find the mass of steam that was added to the water?
by subtracting the mass of the calorimeter and water from the final mass of the calorimeter, water and condensed steam
how did the student make sure that only steam and not hot water, was added to the calorimeter?
by using a steam trap to trap condensed steam and prevent it from entering the calorimeter
why was dry steam used?
to ensure the only steam and not liquid water was added to the calorimeter. adding liquid water would affect the energy exchange equation
give one precaution that the student took to prevent heat loss from the calorimeter
use an insulating material to wrap the calorimeter. place the wrapped calorimeter into a reflective container. use a lid
describe how the mass of the cold water was found.
the student measured the mass of the empty calorimeter, the calorimeter with water, and subtracts these to find the mass of the water
how and why was the water cooled below room temp?
so that heat loss from the calorimeter when above room temp is balanced by heat entering the calorimeter when it is cooler than room temp
a thermometer with a low heat capacity was used to ensure accuracy. explain why.
a low hear capacity ensures that the thermometer is sensitive- a small amount of energy is needed for a change in temp. this improves the accuracy of the temp readings
