GOOD EXPLANANTION NEEDED

Question

Julie and Terry were talking about stuff while sitting around the campfire. They were marveling about all the different types of stuff that exists. Julie told Terry that stuff is called matter and that all matter is made of atoms. She also said that there are only about 100 different types of atoms. Terry said, “That's impossible! How can all the different types of stuff out there be made of just 100 different elements?” Julie said, “On Monday, let’s talk to our teacher about this.”In the meantime, they decided to make some hot chocolate on the campfire. They heated some water in a pan. Think about the changes in matter and energy that occur while Julie is heating the water to 70ᵒC for making hot chocolate. 

2 points

Closely examine the model that represents the water before heating below. How would a revised model of the water change during boiling? Select the best TWO responses.

The particles would get bigger.

The particles would be further apart.

The particles would move faster.

The particles would move slower.

The particles would be closer together.

The particles would get smaller.

Answer 1

The correct answer for this question would be that the particles representing molecules of water would both move faster and be further apart. This is the case because heat being applied to a system increases energy within each molecule of water. As heat is applied, the hydrogen bonds holding water molecules together have are overpowered by the increased energy in the system. The energized molecules will increase in speed and due to the weakened hydrogen bonds, will also spread to be farther apart.