# Homework Update

This is a big unit covering lots of different ideas,  be sure to keep up on the reading and questions.

Our Homework so far this unit:

• BrownTxt. p. 270-275; q. 1-6   –Properties of Matter and Materials
• BrownTxt. p. 240-245; q. 1-9   –Phases of Matter
• Phase change Problem solving  –Phase Transistions
• BrownTxt. p. 230-232; q. 2-7   –Mixtures
• BrownTxt.: Read 442-445 on Solutions

# Solutions Computer Activity

We’ll be doing another computer activity with the chromebooks today.  This is a set of activities developed by Mrs. Petersen. She’s so great!

But First lets cover some Vocab in these notes:

Here is a link to the worksheet if you need a copy at home.

The Activity is Here

Because we are working with chromebooks, one of the simulations cannot be loaded– the solubility link. we’ll have to go through it together!

# I think I have a Solution!

Now that we are comfortable with Phases and Phase Transistions, it’s time to mix it up!

First we spent some time talking about mixtures themselves:  Homogenous vs Heterogenous (smooth vs chunky) and we introduced some examples. It’s all in this talk.

Can you think of several more examples of homogeneous and heterogeneous mixtures in everyday life?  Food is a good place to start, but almost everything around you is a mixture of one kind or another!

We also had homework from text today,

# Going through a Phase

So far this unit we’ve talked about Properties of Matter (think ductility, luster, density, boiling point, etc) and phases of matter (solid, liquid, gas, plasma, and Bose-Einstein Condensates). But one of the most important concepts in this unit is understanding the way energy is absorbed or released in the transition from one phase to the other.

We saw several demonstrations of phase transitions–my heat pack, the can-crushing, and your lab too.

We practiced naming the parts of a phase change heating/cooling curve with this worksheet. We also took a short set of notes on phase change graphs.

The key point here is to recognize that phase changes can absorb or release lots of energy without changing temperature.  This is very useful in engines and other technology.

Can you describe what is happening at every letter above?

# The Race to Zero

Good Day Foundations of Science!
While I’m away, I expect my students to be on their best behavior.
First, we’ll be taking a quiz.  Use your notes from last class and the Phases Graphic to prep for the Quiz.

Today we’ll watch a ‘cool’ (lol!) video about the relationship of temperature and phase of matter: The Race to Absolute Zero.  Remember that our Kinetic Model of Molecules states that Heat is really just how much the atoms or molecules move (or vibrate).  So if you can stop them, you can have Zero Heat.
While you are watching be sure to take notes on these questions:

1. What is Absolute Zero?
2. How the scientists cool the atoms?  With a fridge?
3. Why are scientists interested in getting closer to Absolute Zero?

Go Full screen!—–^