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Comparing Mass and Volume in a Liquid Mix 4 questions
Comparing Mass and Volume in a Liquid Mix
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class models a mixture of water and glycerol in a closed container at constant temperature. No material is added or removed when the liquids mix. The liquid molecules can change how they pack together as they move into the mixture.
| Measurement | Mass (g) | Volume (mL) |
|---|---|---|
| Water before mixing | 20.0 | 20.0 |
| Glycerol before mixing | 25.2 | 20.0 |
| Mixture | 45.2 | 39.0 |
Question 1
Which conclusion follows from the measurements?
- Both the masses and volumes add exactly.
- The masses add, but the mixture volume is below the sum of the initial volumes.
- The mixture loses 1.0 g during mixing.
- The mixture gains 1.0 mL during mixing.
Question 2
Calculate the mixture’s measured density using the final mass and volume.
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A student attributes the lower volume to a loss of molecules. The class instead considers whether attractions between the mixed molecules change their spacing.
Question 3
Use the mass result and the model to explain how the volume can drop without material leaving the container.
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Question 4
Would using 40.0 mL in the density calculation give a result higher or lower than the measured density? Explain.
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