Factors That Affect Dissolving Worksheet

Question 1

Which change can shorten the time needed for a small sugar cube to dissolve in water at fixed temperature?

1. Stir the water.
2. Reduce the contact between sugar and water.
3. Keep the sugar out of the water.
4. Replace the water with an empty container.

Question 2

Explain why crushed sugar often dissolves faster than an equal mass in one cube.

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Question 3

Which observation directly measures dissolving rate for a fixed solute mass?

1. Time until no solid remains
2. Maximum mass dissolved at equilibrium
3. Mass of an empty cup
4. Boiling point of pure water

Question 4

Explain why faster stirring does not necessarily increase the equilibrium solubility at the same temperature.

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Question 5

Which pair isolates the effect of changing particle size?

1. P and Q
2. P and R
3. Q and R
4. All pairs isolate size.

Question 6

Calculate how many seconds steady stirring reduced the dissolving time for crushed sugar.

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Question 7

Which quantity is the same at the end of each completed trial?

1. Elapsed time
2. Initial particle size
3. Mass of sugar dissolved
4. Stirring condition

Question 8

Propose one new trial that would test stirring for the cube alone. Identify the trial to use for comparison.

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