Joshua fills one large container with cold water Then he fills a small container with hot water and red food coloring, and seals it with a lid. Next, he puts the small container into the large container and removes the lid of the small container. He observes the red colored water from the small container rising up to the top of the cold water. Which two statements explain why this happens?(1 point)
Responses
because the hot water has the same density as the cold water
because the hot water has the same density as the cold water
because the hot water molecules move as fast as those of cold water
because the hot water molecules move as fast as those of cold water
because the hot water is more dense than the cold water
because the hot water is more dense than the cold water
because the hot water molecules move faster than those of cold water
because the hot water molecules move faster than those of cold water
because the hot water is less dense than the cold water
because the hot water is less dense than the cold water
The correct statements are:
1. because the hot water molecules move faster than those of cold water
2. because the hot water is less dense than the cold water
When hot water is added to cold water. In which direction does the heat energy move?(1 point)
Responses
The heat energy moves from the hot water into the cold water.
Equivalent amounts of heat energy move in both directions.
No heat energy moves, as it all remains in the hot water.
The heat energy moves from the cold water into the hot water.
The heat energy moves from the hot water into the cold water.
If a mixture of different gases is heated, it rises to the top of its container. Which statement best explains this result?(1 point)
Responses
Heated gases have lower kinetic energy and lower density.
Heated gases have higher kinetic energy and decreased density.
Heated gases have higher kinetic energy and higher density.
Heated gases have lower kinetic energy and higher density.
Heated gases have higher kinetic energy and decreased density.
The correct answer is:
1. because the hot water is less dense than the cold water
2. because the hot water molecules move faster than those of cold water
The correct answers are:
1. because the hot water is less dense than the cold water
2. because the hot water molecules move faster than those of cold water
Explanation:
1. The hot water is less dense than the cold water: Density is defined as the mass of a substance per unit volume. When two substances of different densities are mixed together, the less dense substance tends to rise above the denser substance. In this case, the hot water is less dense than the cold water, so it rises to the top.
2. The hot water molecules move faster than those of cold water: Temperature is a measure of the average kinetic energy of particles in a substance. When heated, the hot water molecules gain more kinetic energy and thus move faster than the molecules in the cold water. This increased molecular movement allows the hot water molecules to disperse and mix with the cold water, resulting in the red colored water rising up.