1) The diagram below shows a phase diagram of water. Which line shows how the melting point changes with increasing pressure? a) Melting line slopes to the left b) Melting line slopes to the right c) Melting line is horizontal d) Melting line is vertical 2) The diagram below shows an ice block under a sharp skate blade. Why does the ice melt under the blade? a) Friction alone melts the ice  b) Increased pressure raises melting point c) Temperature rises due to sunlight d) Increased pressure lowers melting point 3) Which change occurs when pressure is increased on a boiling liquid? a) Boiling point decreases b) Boiling stops entirely c) Boiling point remains constant d) Boiling point increases 4) The boiling point of water at the top of Mount Everest is lower than at sea level because: a) Atmospheric pressure is lower at high altitudes b) There is more oxygen at high altitudes c) The air is colder at high altitudes d) Water molecules are lighter at high altitudes 5) In a pressure cooker, food cooks faster because.. a) The boiling point of water decreases b) The food absorbs less heat c) The melting point of food increases d) The boiling point of water increases ✅ 6) The diagram shows boiling points of water at different pressures. What is the boiling point at 2 atm? a) 80°C b) 100°C c) 120°C d) 160°C 7) Why is it hard to cook food quickly on a high mountain? a) Low temperature b)  High pressure reduces boiling point c) Low oxygen reduces boiling point  d) Low pressure reduces boiling point 8) The boiling point of ethanol will be higher if.. a) The pressure is increased b) The pressure is decreased c) The ethanol is stirred d) The ethanol is pure 9) Which factor explains why deep-sea vents can have liquid water at over 100°C? a) High pressure b) Low salinity c) High oxygen content d) High density of water 10) If vapour pressure equals atmospheric pressure, a liquid will a) Condense b) Freeze c) Boil d) Evaporate slowly

Explain effects of pressure on the melting and boiling points

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?