Interconversion of States of Matter
Chemistry ⇒ States of Matter
Interconversion of States of Matter starts at 6 and continues till grade 12.
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See sample questions for grade 9
A beaker contains water at 100°C. What state change is occurring?
A block of dry ice (solid CO2) is left in an open dish. It disappears without leaving any liquid. What process has occurred?
A student heats a beaker of ice at 0°C. What state change will occur?
A student observes that naphthalene balls kept in a cupboard become smaller over time. Which process is responsible for this observation?
Calculate the amount of heat required to melt 10 g of ice at 0°C. (Latent heat of fusion of ice = 334 J/g)
Describe the difference between melting and freezing in terms of energy change.
Describe what happens to the movement of particles during melting.
Describe what happens to the temperature of a substance during a change of state.
Explain why dew forms on grass in the early morning.
Explain why evaporation causes cooling.
Explain why the boiling point of water changes with atmospheric pressure.
Explain why wet clothes dry faster on a windy day.
Is condensation an endothermic or exothermic process?
Name one substance that undergoes sublimation at room temperature.
A scientist observes that when iodine crystals are gently heated, they change directly from solid to vapor without becoming liquid. What is this process called, and what does it indicate about the forces between iodine molecules?
A sealed container contains both ice and water at 0°C. If more heat is added, what will happen to the temperature and the states of matter present? Explain your answer.
Calculate the total amount of heat required to convert 50 g of ice at -10°C to water at 0°C. (Specific heat capacity of ice = 2.1 J/g°C, latent heat of fusion of ice = 334 J/g)
Describe how humidity affects the rate of evaporation and explain the reason for this effect.
Explain why substances with weak intermolecular forces tend to have lower melting and boiling points, and how this affects their interconversion between states of matter.
Explain, at the particle level, why the temperature of a substance does not change during the process of melting or boiling, even though heat is being supplied.
