Warm-Up 10-16-17 Describe atom movement in a solid. Do you think it is possible to change the state of matter something is? Explain. Give examples. If I add heat to ice water, what happens to the temperature of the water as the ice continues to melt?

Go to my website… Download: 10-10-17 Changes of State of Matter Mini Labs

Prior Knowledge Class Discussion: When you breathe on a cold window in the winter, the window gets tiny droplets of moisture on it or “fogs up.” 1) Why do you think the cold window gets foggy? 2) Have you seen this happen anywhere else?

Lets figure out what is really going on by doing a few mini labs… Phase Change Mini Labs 1- Evaporation 2- Freezing 3- Condensation We will do one mini-lab at a time.

Mini Lab #1: EVAPORATION Paper Towel Activity Follow the directions on the handout Done? Clean up and dry ziplock baggies

The process in which heat changes liquid into a gas or to a vapor. Turn to P. 29 Evaporation: The process in which heat changes liquid into a gas or to a vapor. Show to Students: http://www.middleschoolchemistry.com/multimedia/chapter2/lesson2#evaporation

Pg. 28 Draw a picture that represents evaporation, what did you observe?

Mini Lab #2: FREEZING Ice Video http://www.middleschoolchemistry.com/multimedia/chapter2/lesson4#ice_structure Watch demo and add observations to handout Water vapor molecules in the air near the can cooled when energy from the air transferred to the cold can. These water molecules slowed down, condensed to liquid water, and then froze to become ice.

Freezing: This is when a liquid becomes a solid Freezing: This is when a liquid becomes a solid. The temperature at which this happens is called the freezing point. Show to Students: http://www.middleschoolchemistry.com/multimedia/chapter2/lesson4#ice_structure show the liquid nitrogen one its cool too

Draw a picture that represents freezing, what did you observe? Describe what happens to the water molecules as they move from being water vapor near the can to ice on the can http://www.middleschoolchemistry.com/multimedia/chapter2/lesson4#ice_structure

What do you notice about these particles? You might want to add this to your drawing on the left.

Mini Lab #3: CONDENSATION Condensation in a bag Follow the directions on the handout Done? Clean up and dry ziplock baggie and cups

Ex: think of dew in the morning Turn to P. 29 Condensation: The opposite of evaporation. This is when water vapor in the air condenses (groups together) to form a liquid. Ex: think of dew in the morning Show to Students: http://www.middleschoolchemistry.com/multimedia/chapter2/lesson3 show the liquid nitrogen one its cool too

Pg. 28 Draw a picture that represents Condensation, what did you observe?

Revise Your Thinking: When you breathe on a cold window in the winter, the window gets tiny droplets of moisture on it or “fogs up.” Using what you have learned today, explain why you think the cold window gets foggy.

Brainpop Video: Matter Changing States