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 9
A student heats a sample of naphthalene and observes that its temperature remains constant at 80°C while it melts. What is the reason for this observation?
Describe what happens to the arrangement and movement of particles during condensation.
Describe what happens to the particles of a solid as it melts.
Describe what happens to the temperature of a substance during its change of state.
A 100 g block of ice at 0°C is melted by adding 33.4 kJ of heat. What is the latent heat of fusion of ice?
A 50 g sample of ice at 0°C is converted to water at 0°C. If the latent heat of fusion of ice is 334 J/g, how much heat is required?
A beaker contains 200 g of water at 100°C. How much heat is needed to convert all the water to steam? (Latent heat of vaporization of water = 2260 J/g)
A student heats a sample of naphthalene and observes that its temperature remains constant at 80°C while it melts. What is the reason for this observation?
Which of the following best describes latent heat? (1) Heat that raises temperature (2) Heat that changes state without changing temperature (3) Heat that cools a substance (4) Heat that is lost to the environment
Which of the following changes of state involves the greatest increase in particle energy? (1) Melting (2) Freezing (3) Condensation (4) Vaporization
Which of the following factors increases the rate of evaporation? (1) Decreasing temperature (2) Increasing surface area (3) Increasing humidity (4) Decreasing wind speed
Which of the following is an endothermic process? (1) Freezing (2) Condensation (3) Melting (4) Deposition
Fill in the blank: The energy required to change 1 kg of a liquid into gas at its boiling point is called __________.
Fill in the blank: The process of a liquid changing into a gas at a temperature below its boiling point is called __________.
Fill in the blank: The process of a solid changing directly into a gas is called __________.
Fill in the blank: The process of changing from a liquid to a solid is called __________.
Is the following statement true or false? The melting point of ice is 0°C at standard atmospheric pressure.
State whether the following is true or false: The freezing point of a substance is the same as its melting point.
State whether the following is true or false: The temperature of a substance increases during the process of melting.
True or False: During condensation, a gas absorbs heat from its surroundings.
