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 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?
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.
During which change of state does a substance release energy to its surroundings?
Explain the difference between evaporation and boiling.
Explain why ice at 0°C is more effective in cooling than water at 0°C.
Explain why sweating helps to cool the body.
Explain why the boiling point of water is lower at higher altitudes.
What is the main difference between boiling and evaporation in terms of energy?
What is the name of the heat energy required to change 1 kg of a solid into liquid at its melting point?
Which process is the reverse of condensation?
