SME
Grade 10 Science · Problem type
Phase changes: heat in or heat out?
Use this for “Is freezing endothermic or exothermic?”
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Does the change take heat in or give heat off?
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Assumptions
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Pulling particles apart takes energy: melting, evaporating and sublimation take heat in.
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Particles coming together give that energy back: freezing, condensing and deposition give heat off.
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Phase changes, vapor pressure and colligative properties
Main lesson
Vapor pressure of a solution
Use this for “0.5 mol of glucose is dissolved in 9.5 mol of water at 25 °C. How much does the vapor pressure drop?”
What moves the boiling point?
Use this for “Why does an egg take longer to cook in boiling water high on a mountain?”