Let's go through each question step by step and solve the
Solutions and Molarity Quiz based on the provided image.
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Question 1: Which of the following would *not* be classified as a solution?
Options:
a) Pure water
b) Blood
c) Tea
d) Grape juice
Explanation:
A
solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).
-
Pure water: This is
not a solution because it contains only one substance — water. There is no solute dissolved in it.
-
Blood: A complex mixture, but it’s considered a
colloidal suspension, not a true solution. However, it has dissolved components (like glucose, ions), so some might argue it's a solution. But strictly speaking, blood is
not a true solution due to suspended cells.
-
Tea: Typically a solution (e.g., tea leaves dissolved in water with sugar, etc.), so it
is a solution.
-
Grape juice: Contains dissolved sugars and other substances in water — a
solution.
But the key here is that
pure water is
not a solution at all — it’s a pure substance.
✔ Correct answer: a) Pure water
>
Note: While blood is not a true solution either, "pure water" is definitively
not a solution, making it the best choice.
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Questions 2–4: Use the diagram above
We are given three beakers labeled A, B, and C, each containing blue liquid with red dots representing solute particles.
-
Solution A: Few red dots (low concentration)
-
Solution B: Medium number of red dots
-
Solution C: Many red dots (high concentration)
All have the same volume.
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Question 2: Assuming they all have the same volume, which of the solutions would be the most saturated?
Options:
a) Solution A
b) Solution B
c) Solution C
d) All of the solutions have the same saturation
Explanation:
-
Saturation refers to how much solute is dissolved in a solvent.
- The
most saturated solution has the
highest amount of solute dissolved.
- From the diagram,
Solution C has the
most solute particles, so it is the
most concentrated and likely the
most saturated.
✔ Correct answer: c) Solution C
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Question 3: The solution on the right is diluted by a scientist. After the dilution, which of the solutions above would it most closely resemble?
The image shows a
smaller volume of solution (with fewer red dots) in a beaker — this represents the
diluted version.
- Dilution means adding more solvent (e.g., water), which
reduces concentration.
- The diluted solution will have
fewer solute particles per unit volume.
- Looking at the options:
-
Solution A has the
lowest concentration (fewest particles).
- So after dilution, the solution would resemble
Solution A.
✔ Correct answer: a) Solution A
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Question 4: What must be done to make the molarity of Solution B match the molarity of Solution C?
Molarity = moles of solute / liters of solution
We want
Solution B to have the
same molarity as
Solution C, meaning it needs
more solute (since both have same volume, from the diagram).
Currently:
- Solution B has fewer solute particles than Solution C.
- To increase molarity, we need to
add more solute.
Options:
a) Add additional solvent to Solution B → This would
decrease molarity
✘
b) Add additional solute to Solution B → This increases solute → increases molarity
✔
c) Decrease the molarity of Solution B → That makes it worse
✘
d) Dilute Solution B → Again, decreases molarity
✘
✔ Correct answer: b) Add additional solute to Solution B
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✔ Final Answers:
1.
a) Pure water
2.
c) Solution C
3.
a) Solution A
4.
b) Add additional solute to Solution B
Let me know if you'd like this turned into a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of solutes and solvents worksheet.
