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 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 500 g sample of water at 100°C is to be converted to steam at 100°C. If the latent heat of vaporization is 2260 J/g, how much heat is required?
A student observes that naphthalene balls kept in a cupboard become smaller over time. Which change of state is responsible for this observation?
Calculate the amount of heat required to melt 200 g of ice at 0°C. (Latent heat of fusion of ice = 334 J/g)
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.
State the law that explains why temperature remains constant during a change of state.
What is the main difference between evaporation and boiling?
What is the term for the temperature at which a solid turns into a liquid?
When water boils at 100°C at standard atmospheric pressure, what is the state change occurring?
