Question

density identifies matter
part a
students were given three graduated cylinders containing three different liquids: oil, water, and syrup. they were asked to predict what would happen when the three liquids were poured into one container. the majority of students said that the liquids would form a mixture. the liquids were poured into a jar and the results can be seen here. explain what happened to the three liquids.
a oil is lighter than water; water is lighter than syrup.
b the liquids formed three distinct layers because of varying masses.
c the liquids formed three distinct layers because of different volumes.
d the liquids formed three distinct layers because of different densities.

Explanation:

To determine the correct answer, we analyze the concept of density. Density is defined as mass per unit volume ($
ho = \frac{m}{V}$). When immiscible liquids (like oil, water, and syrup) are mixed, they form layers based on their densities. A liquid with lower density will float on top of a liquid with higher density.

• Option A: Saying "lighter" is not the precise scientific term; density (mass per unit volume) is the key factor, not just "lightness" (which could be misinterpreted).
• Option B: Mass alone doesn't determine layering—density (mass/volume) does. Different masses with different volumes could have the same density.
• Option C: Volume alone doesn't determine layering. Two liquids with different volumes could have the same density.
• Option D: The liquids (oil, water, syrup) are immiscible and have different densities. So, they form distinct layers where the liquid with the lowest density is on top, and the highest density is at the bottom. This matches the observation (oil on top of water, etc.).

Answer:

D. The liquids formed three distinct layers because of different densities