Pre-AP Lesson 1.2

Lesson 1.2
Observing the
Behaviors of Solids,
Liquids, and Gases

Pre-AP Chemistry workbook pgs. 5-10

Objective

Create models that illustrate motion and
arrangement of molecules in different states of
matter and how temperature affects this.

​Instructions: Use the quizizz slides to answer the pages in your workbook.

Station 1: Use the video on the next slide to
write observations on Workbook pg. 6

Petri dish models:

Petri dish models:

Observations:

Explanation:

Diagrams:

Pre-AP Workbook pg. 6

​You should have answered here & now fill out the other portions

​Increasing the temperature of the water increases the energy of the particles so they move faster, leading to more collisions between the food particles and the water particles, causing the food coloring to spread throughout the beaker.

​*You do not need to draw the water particles. Only food food coloring particles and their movement

Station 2: Salt Crystals under magnification

Station 2: Salt Crystals under magnification

​Record your obersvations on page 7 of your pre-ap workbook of the salt crystals.

Observations:

Explanation:

Diagrams:

Pre-AP Workbook pg. 7

​You should have answered here & now fill out the other portions

The salt particles show an orderly arrangement within their cubic structure. There must be a force that holds the particles together in the salt.

​Your drawing should be a repeating pattern of colored and noncolored circles much in the same way as the picture on the left.

Station 3:
Whole-group
demonstration:
diffusion of a gas

Observations:

Explanation:

Diagrams:

Pre-AP Workbook pg. 8

​write observations based on what you observed in the previous 2 slides on the diffusion of a gas.

​The forces among gas particles are very weak, so the particles are more free to move than those in liquids or solids. Gases spread out to fill any container they are in. Gas particles move randomly and collide with other gas particles as they move.

​You do not need to draw the air particles, only the oil particles and how they move.

Analysis
1. What did you observe that supported what you already

knew about the particle nature of matter?

2. What did you observe that deepened your understanding of

the particle nature of matter? Explain how it deepened your
understanding.

Pre-AP Workbook pg. 9

Analysis
3. Write at least one question you have for future investigation.

4. Look at the models you drew at the beginning of class. Are
those models consistent with what you have observed in this
lesson? Do you consider these valid models? Why or why not?

Pre-AP Workbook pg. 9

Boiling Water Demonstration

Consensus Model of Matter

Applying the Shared Model of Matter

1.

Look at the four ideas that make up the consensus model of matter. How do you
think each one applies in this situation?

2.

Using your answers to question 1, write a paragraph (3-5 sentences) explaining
why the surface fogs up.

Pre-AP Workbook pg. 10

​1. Particles of matter are in constant, random motion.
2. The average speed of particles increases with temperature.
3. Macroscopic properties of matter are dependent on motion at the particle level.
4. Interactions among particles, particularly in liquids and solids, determine physical properties of matter.

​The fog is from the water. Some of the water gained enough energy to become vapor and then condensed. The water particles gained thermal energy as they were heated, once enough energy was absorbed, the water began to boil. Some water particles had enough energy to overcome the attractive forces between particles and escaped the surface of the water. Some of the particles landed on the glass and lost energy to the environment, which caused them to condense back to a liquid.