Energy on the Move!
Review Hot and Cold Lab
Question 1: When hot and cold water samples are mixed, is the final temperature hotter than the hot water, colder than the cold water, or someplace between how and cold?
Question 2: Was the final temperature closer to the hot water temperature or the cold water temperature?
Question 3: What do you think might have happened to make the final temperature different from the starting temperature?
1. Think about the hot and cold water as particles. How were the two water samples different?
2. Compare the kinetic energy of the hot water and the final mixture. Compare the kinetic energy of the cold water and the mixture.
Finalize Lab Results
Please take some time to fill in your final results on your lab. This is to be done independently and should be written in complete sentences. Invest yourself a little and take your learning seriously.
The movement of energy from one place to another is called energy transfer. Sometimes matter gets colder as a result of energy transfer. Whenever there is a change in temperature, there is evidence of energy transfer. Think about these two questions
1. Did the energy transfer from the hot water to the cold water, from the cold water to hot, or in both directions?
2. Where did the energy transfer take place?
Idea #1: Kinetic Energy =Heat
The particles that make up matter are in constant motion. As a result, particles have kinetic energy. The level of kinetic energy of the particles in a sample of matter determines how hot it is. Kinetic Energy = heat. The greater the kinetic energy of the particles in a sample of matter, the hotter it is.
Idea # 2: Energy Transfers between particles when they collide
Energy transfers as a result of particle collisions. When a fast-moving particle collides with a slow-moving particle, the one that was going fast slows down, and the one that was going slow speeds up. Energy transfers between particles when they collide. Energy transfer that results from collisions is called conduction.
Idea #3: Energy always transfers from hot to cold
Scientists often talk about energy transfer in terms of flow. Energy is not a fluid; it is a condition of matter, but energy flow is a nice idea because energy always flows "downhill." By downhill I mean from higher energy levels to lower energy levels. Energy always moves from higher energy to lower energy. Always.
Please read pages 32-37 from our Chemical Interactions textbook. and answer the questions found on page 37. Submit your answers on Google Classroom under Energy on the Move assignment.
To finish this day off, you have a final assignment that needs to be completed. I want you to conduct some research about thermometers, and then create an explanation of how a thermometer works. I am taking about an old school thermometer. The one that is filled with red liquid and takes time to show your temperature. Not a digital thermometer that instantly shows the temp. You may use any resource at your disposal to complete this assignment. Submit your assignment onto google classroom when you are finished.