Textbook Question
Label each of the following as either a physical process or a chemical process: b. boiling a cup of water
1. Intro to General Chemistry
Physical & Chemical Changes
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What happens to the water surface when a milk drop is dropped into the water?
A
The milk disperses, creating a swirling pattern due to surface tension.
B
The milk forms a visible layer on the water surface due to density differences.
C
The milk dissolves completely, leaving no visible trace.
D
The milk sinks to the bottom of the container.
Verified step by step guidance1
Understand the concept of surface tension: Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. It is caused by the attraction between the molecules of the liquid.
Consider the density differences: Milk is a colloidal suspension, and its density is slightly higher than that of water, which affects how it interacts with the water surface.
Observe the behavior of liquids with different densities: When a liquid with a different density is added to another, it can either float, sink, or disperse depending on the relative densities and surface tension.
Analyze the interaction of milk and water: When milk is dropped into water, the surface tension of water causes the milk to spread out and create a swirling pattern. This is because the milk is less dense than water and initially floats on the surface.
Conclude the process: The milk forms a visible layer on the water surface due to the density difference and the effect of surface tension, which prevents it from immediately mixing completely with the water.
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