1) What is temperature a measure of? a) The average kinetic energy of the molecules b) The average weight of the molecules c) The average size of the molecules 2) Which of these has the largest total amount of internal (thermal) energy? a) A teaspoon of hot water b) A mug of hot water c) A swimming pool of lukewarm water 3) 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? a) Nine times the temperature rise as before b) Three times the temperature rise as before c) The same temperature rise as before 4) In an experiment to find the specific heat capacity of a metal block, what can be done to reduce experimental error? a) Heat the block up very slowly b) Use a thermometer marked every 2°C instead of every 1°C c) Insulate the metal block to reduce heat escaping to the surroundings 5) How much energy is needed to raise the temperature of 500 g of lead by 10°C? (c=129 J/kg°C) a) 129 J b) 500 J c) 645 J 6) How do the particles in a solid move? a) Randomly in all directions b) They roll all over each other c) They vibrate around a fixed point 7) How much energy does a kilogram of molten lead emit as it freezes if its latent heat of fusion is 22,400 J/kg? a) 4,200 J b) 22,400 J c) 334,000 J 8) What process occurs when a liquid absorbs energy gradually from its environment to change into a gas? a) Evaporation b) Boiling c) Condensation 9) How much energy is transferred to the surroundings when 100g of oxygen gas is condensed into a liquid at the same temperature? a) 21.3 J b) 21.3 kJ c) 213 kJ 10) Which part of a cooling curve shows a change of state? a) The steepest lines b) The horizontal lines c) The vertical lines

Temperature Changes and Energy

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