5 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Checking a Cooled Solution With a Seed 5 questions
Checking a Cooled Solution With a Seed
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A cooled solution has eight grams of dissolved solute in a fixed amount of water. At this temperature the equilibrium limit is five grams. The model can temporarily hold more than that without a crystal starting to grow. It compares a trial with a tiny crystal seed and one without a seed.
| Trial | Dissolved solute before test (g) | Dissolved solute after 1 minute (g) | Dissolved solute after 10 minutes (g) |
|---|---|---|---|
| P, no seed | 8 | 8 | 5 |
| Q, seed | 8 | 5 | 5 |
Question 1
Which reading shows solute remaining above the equilibrium limit after one minute?
- P only
- Q only
- Both
- Neither
Question 2
Calculate how much of the originally dissolved solute has become solid in each trial by one minute. Ignore the mass of the seed.
Write your answer and work on the printable worksheet, or answer online.
Question 3
A student says the seed lowers the amount the water can hold at equilibrium. Evaluate the claim using the later readings.
Write your answer and work on the printable worksheet, or answer online.
A third solution starts with only four grams dissolved in the same amount of water at the same temperature. It receives a seed much smaller than one gram.
Question 4
Predict what happens to that seed if the model reaches equilibrium. Use the capacity and total solute amount.
Write your answer and work on the printable worksheet, or answer online.
The class wants to check whether a rough surface alone can start crystal growth in a fresh eight-gram solution. It has a solute crystal and an insoluble bead with a matched rough surface.
Question 5
Describe a comparison that could test whether the bead also starts growth. Identify what to measure.
Write your answer and work on the printable worksheet, or answer online.
2025 Chemistry Reference Tables · Browse Chemistry worksheets