In this investigation, the student is likely observing the effects of temperature on the diffusion of the food coloring in water. Here's the explanation for the observations:
A. The food coloring moves faster in hot water. - This is true because higher temperatures increase the kinetic energy of particles, leading to faster diffusion.
D. The food coloring is less dense than the cold water. - This may be true depending on the specific food coloring used. Typically, food coloring is designed to mix well with water, so this option can be somewhat context-dependent.
The other options do not accurately explain the observations:
- B. The food coloring moves slower in hot water. - This is incorrect, as higher temperatures increase the movement of molecules.
- C. The food coloring is denser than the cold water. - This is generally not correct for food coloring in water, as it is intended to dissolve.
- E. The food coloring separates into two different colors. - This is typically not the case with food coloring unless it is specifically designed that way.
- F. The food coloring increases the temperature of the water. - This is not true; the food coloring is initially at a lower temperature, so it would not heat the water.
Therefore, the correct selections are:
- A. The food coloring moves faster in hot water.
- D. The food coloring is less dense than the cold water (though this depends on specific circumstances).
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