What happens to water molecules as water is heated?
The molecules move more slowly.
The molecules become less dense.
The molecules sink.
The molecules get closer together.
As water is heated, the molecules move more quickly rather than more slowly. This increased thermal energy causes the molecules to vibrate and move apart, leading to a decrease in density. Therefore, the correct statement is: The molecules become less dense.
A cook places a pot of water over a flame on a stove. What will happen to the water molecules near the surface of the water?
They will become less dense and rise.
They will become more dense and sink.
They will become more dense and rise.
They will become less dense and sink.
The water molecules near the surface of the water will become less dense and rise. As the water is heated, the molecules gain thermal energy, causing them to move faster and spread out. This results in a decrease in density, making the molecules near the surface less dense and causing them to rise. Therefore, the correct statement is: They will become less dense and rise.
A student takes the temperature of a bottle of liquid water and a tub filled with ice. The student then places the bottle of liquid water into the tub of ice. After 15 minutes, which of the following best describes what happens to the temperature of each?
The temperature of both the ice and water decrease.
Both the bottle and the ice stay the same temperature.
The temperature of the ice decreases, while the temperature of the water increases.
The temperature of the ice increases, while the temperature of the water decreases.
When the bottle of liquid water is placed into the tub of ice, heat will transfer from the water to the ice. As a result, the temperature of the water will decrease, while the temperature of the ice will increase. Therefore, the correct statement is: The temperature of the ice increases, while the temperature of the water decreases.
Which option is an example of a transfer of heat by radiation?
people warming up near a campfire
soup being heated in a bowl in the microwave
ice melting in a glass of warm water
a metal spoon in a cup of tea becoming hot