A liquid is heated in a beaker
The density of the liquid changes as its temperature increases.This causes energy tobe transferred throughout the liquid.
How does the density change and what is this energy transfer process?
A rod is made half of glass and half of copper.
Four pins A, B, C and D are nattached to the rod by wax.
The rod is heated in the centre as shown.
The pins fall off when the wax melts.
Which pin falls off first?
In a refrigerator, the cooling unit can be fitted either at the top or at the bottom. In an oven, the heater can be fitted either at the top or at the bottom.
Which row shows the best position for the cooling unit and the best position for the heater?
A student wishes to check the upper and the lower fixed points on a Celsius scale thermometer.
She has four beakers P, Q, R and S.
Beaker P contains a mixture of ice and salt.
Beaker Q contains a mixture of ice and water.
Beaker R contains boiling salt solution.
Beaker S contains boiling water.
Which two beakers should she use to check the fixed points?
Which quantity gives the thermal capacity of a beaker?
A the thermal energy required to change the state of the beaker at constant temperature
B the thermal energy required to raise the temperature of the beaker by 1 °C
C the total mass of hot liquid that the beaker can hold
D the total volume of hot liquid that the beaker can hold
A jug of water is at room temperature.
Several ice cubes at a temperature of 0 °C are dropped into the water and they begin to melt immediately.
What happens to the temperature of the water and what happens to the temperature of the ice cubes while they are melting?