How can the appearance of a substance change without it becoming a different substance?
Question: What happened to the liquid in Titan’s lake?
Investigations Questions:
How does the appearance of a substance change when it changes phase? (1.2)
What happens to the molecules of a substance when it changes phase? (1.3, 1.4, 1.5, 1.6)
Key Concepts:
1. A solid holds its shape and does not take the shape of its container. (1.2)
2. A liquid flows and can take the shape of its container. (1.2)
3. A gas has no visible shape and fills its container. (1.2)
1 Revised. A solid keeps its shape because its molecules only move in place, not around each other. (1.5)
2 Revised. A liquid can flow because its molecules move around, not away from each other. (1.5)
3 Revised. A gas does not have a visible shape because gas molecules can move away from each other. (1.5)
4. A phase change is when the molecules that make up a substance experience a change to their freedom of movement. This phase change involves a macroscale change in appearance. (1.6)
5. A change that can be observed at the macroscale can be explained by a change at the molecular scale, which cannot be observed with the naked eye. (1.6)
Question: What could cause liquid methane to change phase?
Investigations Questions:
What can cause molecules’ freedom of movement to change? (2.1)
Why can transferring energy into or out of a substance change molecules’ freedom of movement? (2.2)
Key Concepts:
6. When energy is transferred to or from a substance, it can change the molecules' freedom of movement. (2.1)
7. Temperature is a measure of the average kinetic energy of the molecules of a substance (2.2)
8. Transferring energy to a substance increases the kinetic energy of that substance's molecules. Transfering energy from a substance decreases the kinetic energy of that substance's molecules.
Question: Why didn’t the liquid methane change phase before 2007?
Investigations Questions:
Why does an energy transfer not always result in phase change? (3.1, 3.2)
How does molecular attraction affect whether or not a phase change will occur? (3.2, 3.3)
Key Concepts:
9. Whether or not a phase change occurs is determined by the interaction between the kinetic energy of the molecules and the attraction pulling the molecules together. (3.2)
10. The molecular attraction of a substance never changes. (3.2)
11. A phase change occurs when the kinetic energy increases enough to overcome the attraction between molecules. (3.3)
12. A phase change occurs when the kinetic energy decreases enough so that the attraction between molecules pulls them together. (3.3)
13. Different substances can have either weaker or stronger molecular attraction. (3.3)
Question: Why is the liquid oxygen machine producing less liquid oxygen than normal?
***Simply memorizing vocabulary words does us no good - being able to use them in conversation and use multiple words in the same sentence - THAT will help you better understand the content.***
phase
molecule
scale
refute
freedom of movement
temperature
kinetic energy
molecular attraction
20pts: Learning Check 1 (Google Form assigned through Classroom)
20pts: Learning Check 2 (Google Form assigned through Classroom)
60pts: Written Argument (Google Doc assigned through Classroom)
60pts: Final Assessment (done through Amplify online)
Final Unit Grade worth 100pts:
Option 1: 20pt learning check 1 + 20pt learning check 2 + 60pt Written Argument
Option 2: 20pt learning check 1 + 20pt learning check 2 + 60pt End of Unit Assessment
For students who earned a perfect score on the Critical Juncture Assessment, their grade will be determined:
Option 3: 20pt learning check 1 + 20pt learning check 2 + 60pt Independent Project Grade