GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When sugar is placed in water it disappears.
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Sugar dissolves when put in water.
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Either A or B
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None of the above
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Detailed explanation-1: -When water dissolves sugar, the water molecules attract the sucrose molecules and pull them away from each other. Notice how the positive areas of the water molecules (near the hydrogen atoms, white) are attracted to the negative area near the oxygen atoms (red) on the sucrose molecules.
Detailed explanation-2: -When you mix sugar and water, the sugar will dissolve into the water and will create a solution. The solution will be homogeneous because the sugar is fully dissolved, and you can no longer see it.
Detailed explanation-3: -Dissolution of sugar in water is a physical change because it does not result in the formation of a new substance. It is a reversible change as sugar and water can be extracted back from the solution by the process of crystallization followed by evaporation.
Detailed explanation-4: -When we dissolve some sugar in water, the increase in the level of water is negligible. This is because particles of sugar fill up the spaces between particles of water.