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 10
A student observes that naphthalene balls kept in a cupboard become smaller over time. Which change of state is responsible for this observation?
Describe what happens to the particles of a solid as it is heated and changes into a liquid.
Describe what happens to the temperature of a substance during a change of state, such as melting or boiling, when heat is continuously supplied.
During which change of state is energy released by the substance?
Explain why ice at 0°C is more effective in cooling than water at 0°C.
Explain why steam at 100°C can cause more severe burns than boiling water at 100°C.
A 250 g block of ice at 0°C is placed in a room at 25°C. How much heat is needed to completely melt the ice? (Latent heat of fusion = 334 J/g)
A student observes that naphthalene balls kept in a cupboard become smaller over time. Which change of state is responsible for this observation?
Which of the following best describes the process of freezing? (1) Liquid to gas (2) Gas to liquid (3) Liquid to solid (4) Solid to liquid
Which of the following best explains why sweating cools the body? (1) The sweat absorbs heat from the body and evaporates, taking the heat away. (2) The sweat freezes on the skin. (3) The sweat reflects sunlight. (4) The sweat increases body temperature.
Which of the following changes of state requires the most energy per unit mass? (1) Melting (2) Boiling (3) Freezing (4) Condensation
Which of the following is an example of deposition? (1) Frost forming on a cold surface (2) Ice melting (3) Water boiling (4) Alcohol evaporating
Fill in the blank: The amount of heat required to change 1 kg of a solid into liquid at its melting point is called its __________.
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 changing from a gas to a solid without passing through the liquid state is called __________.
Fill in the blank: The temperature at which a liquid changes into a gas at atmospheric pressure is called its __________ point.
Is it possible for a substance to exist in all three states (solid, liquid, gas) at the same time under certain conditions?
State whether the following statement is true or false: The melting point and freezing point of a pure substance are the same temperature.
True or False: Boiling and evaporation are both processes that convert a liquid into a gas.
True or False: During condensation, heat is absorbed by the substance.
