A student predicts that more sugar will dissolve in warm water than in cold water. She puts some water in a container, adds sugar, and then stirs. The amount of undissolved sugar is then observed. When this student repeats the experiment to verify her prediction, the only thing that should change is the-

PHYSICAL SCIENCES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	amounts of sugar used
B	amount of time stirring
C	amount of water used
D	temperature of the water

Explanation:

Detailed explanation-1: -At a higher temperature, there are more spaces between the water molecules for the sugar to dissolve into so the solution forms more quickly. The molecules of water are also moving faster at a higher temperature and this causes the dissolution rate to increase as well.

Detailed explanation-2: -Temperature–Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.

Detailed explanation-3: -Sugar dissolves better in hot water as the temperature is higher than in cold water. Solids become more soluble as the temperature increases and hence, sugar being solid is easily soluble in hot water.

Detailed explanation-4: -Breaking up, crushing or grinding a sugar cube before adding it to water increases the sugar’s surface area. The more surface area a solute has, the faster it will dissolve because more particles of the sugar can interact with the water.

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