Heat and Temperature: Going Further
Particle theory and heat transfer used to explain and calculate, not just name.
8 questions, free, marked as you go with a worked explanation on every one.
What this covers
- heat and temperature
The questions
- Two identical mugs of tea are poured at the same time. One is left on the counter, the other is put on a cold granite slab. The tea on the granite cools faster. Which explanation fits best?
- A 250 g block of aluminium at 95 degrees Celsius is dropped into water and ends up at 25 degrees Celsius. Aluminium needs about 0.90 J to raise one gram by one degree. How many joules did the block release as it cooled?
- A vacuum flask keeps soup hot. Its silvered inner surface is there to reduce which kind of heat transfer?
- Which of these observations are explained by the particle model saying that particles move faster when heated? Select all that apply.
- A kettle raises 1.5 litres of water, which has a mass of 1500 g, from 18 degrees Celsius to boiling at 100 degrees Celsius. Water needs 4.2 J per gram per degree. How many kilojoules of energy does that take?
- Why does a room with a radiator under the window still warm evenly, even though the radiator only touches the air right beside it?
- Two students measure a beaker of water while it boils. The temperature stops rising at 100 degrees Celsius even though the burner is still on. What is happening to the energy going in?
- A house loses heat through its windows at 900 J each second. Triple glazing would cut that loss by 40 percent. How many joules per second would the house lose through the windows after the upgrade?