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Questions 1 What does the rate of dissolving mean? 2 Name two factors that affect the rate of dissolving. 3 a How does heating affect the particles in a solution? b Explain how this affects dissolving. 4 Explain why sugar will dissolve on its own in a cup of cold water if we leave it long enough.
Short answers
Rate of dissolving means how quickly a solute dissolves in a solvent — the amount that dissolves in a given time.
Two factors: temperature and surface area of the solute.
Smaller pieces have more surface area, so they dissolve faster.a) Heating gives the particles more kinetic energy, so they move faster and collide more often.
b) These faster collisions with the solute pull its particles into the solution more quickly, so dissolving happens faster. Heating can also increase how much of many solids can dissolve.Water particles are always moving randomly. They continually collide with the sugar and pull sugar particles into the water. Over time, diffusion spreads the sugar through the water, so it dissolves without stirring or heating. Cold water only makes this slower. If there is more sugar than the water can dissolve, some will remain.
Key idea: Dissolving is not the solute “disappearing” — its particles separate and mix with the solvent particles. A higher temperature or more surface area makes this happen faster.
Check: Heating or stirring the cold-water sugar would speed it up, but neither is required for dissolving to happen.
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Short, easy answers:
Rate of dissolving = how fast a solute dissolves.
Two factors: temperature and the size of the pieces.
(Smaller pieces dissolve faster. Stirring also helps.)a) Heating makes the particles move faster.
b) Faster particles bump and mix more, so the solute dissolves faster.Water particles are always moving. They bump into the sugar and slowly pull sugar particles away. The sugar then spreads through the water. Cold water makes this slower, but after enough time the sugar still dissolves on its own.
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