1. The melting point and boiling point of lead are 327 and 1774 degrees celcius and -219 and -183 for Oxygen.
(i) At - 200 0 C will the oxygen be a solid, liquid, or gas? ..........
(ii) At 450 0 C will the lead be a solid, liquid, or gas? ............
(b) The graph shown alongside shows how the temperature of a pure substance changes as it is heated.
(i) At what temperature does the substance melt? ................
(ii) Label the section of the graph with a letter X where the substance is a liquid only and with a letter Y where it exists as both a liquid and solid at the same time.
(iii) If the heater provides 100J of heat energy every second use the graph to calculate the energy require to melt this substance
(iv) If 1.5 kg of the substance was used, use your answer to part (ii) to calculate the specific latent heat of fusion for this substance. ........................................................................................................................................
Hints
Think about what melting and boiling point mean. What state will the substances be in above and below these points?
What is happening when the temperature remains constant?
Think about which states the substance is in at each point