Change of State
Physics ⇒ Heat and Thermodynamics
Change of State starts at 8 and continues till grade 12.
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See sample questions for grade 11
Define latent heat of fusion.
Describe what happens to the arrangement and movement of particles during melting.
During the boiling of water, what happens to the temperature of the water?
During which change of state does a substance absorb energy but does not increase in temperature?
Explain why ice at 0°C is more effective in cooling than water at 0°C.
A 0.4 kg block of a substance at -10°C is heated until it becomes steam at 100°C. The specific heat capacity of the solid is 2,000 J/kg·K, the specific heat capacity of the liquid is 4,200 J/kg·K, the latent heat of fusion is 330,000 J/kg, and the latent heat of vaporization is 2,260,000 J/kg. Calculate the total heat required for this process.
A 200 g sample of a substance at its melting point is supplied with 66,000 J of heat, and only 150 g of it melts. What is the specific latent heat of fusion of the substance?
A scientist observes that a certain solid, when heated, changes directly into a gas without passing through the liquid state. This process is called __________.
Which of the following best describes the process of melting? (1) Solid to liquid (2) Liquid to gas (3) Gas to solid (4) Liquid to solid
Which of the following best explains why pressure cookers cook food faster? (1) They increase the boiling point of water. (2) They decrease the boiling point of water. (3) They increase the latent heat of vaporization. (4) They decrease the latent heat of vaporization.
Which of the following factors does NOT affect the rate of evaporation? (1) Surface area (2) Humidity (3) Atmospheric pressure (4) Color of the liquid
Which of the following is an example of deposition? (1) Snow formation from water vapor (2) Ice melting (3) Water boiling (4) Alcohol evaporating
Sublimation is the process in which a substance changes directly from ________ to ________ without passing through the liquid state.
The energy required to change 2 kg of water at 100°C to steam at 100°C is ________ J. (Latent heat of vaporization of water = 2,260,000 J/kg)
The process by which a liquid changes into a gas at a temperature below its boiling point is called __________.
The process of deposition is the direct change from ________ to ________.
True or False: The boiling point of a liquid increases with an increase in atmospheric pressure.
True or False: The latent heat of vaporization is always greater than the latent heat of fusion for the same substance.
True or False: The melting point and freezing point of a pure substance are the same temperature.
True or False: The temperature of a substance remains constant during a change of state.
