Changes in a material's temperature or state of matter are caused by changes to the internal energy. The energy required by different materials depends on their 'heat capacity' and 'latent heat'.
What is temperature a measure of?
The average kinetic energy of the molecules
The average weight of the molecules
The average size of the molecules
Which of these has the largest total amount of internal (thermal) energy?
A teaspoon of hot water
A mug of hot water
A swimming pool of lukewarm water
Some energy is given to heat some water. If three times as much water were to be heated for three times as long, how would the new temperature rise compare?
Nine times the temperature rise as before
Three times the temperature rise as before
The same temperature rise as before
In an experiment to find the specific heat capacity of a metal block, what can be done to reduce experimental error?
Heat the block up very slowly
Use a thermometer marked off every 2°C instead of every 1°C
Insulate the metal block to reduce heat escaping into the surroundings
How much energy is needed to raise the temperature of 500 g of lead by 10°C? (c = 129 J/kg°C)
How do the particles in a solid move?
Randomly in all directions
They roll over each other
They vibrate around a fixed point
How much energy does a kilogram of molten lead emit as it freezes if its latent heat of fusion is 22,400 J/kg?
What process occurs when a liquid absorbs energy gradually from its environment to change into a gas?
How much energy is needed to turn 100 g of oxygen gas into a liquid at the same temperature? L = 213 kJ/kg
Which part of a cooling curve shows the changes of state?
The steepest lines
The horizontal lines
The vertical lines