CHEM 29: More phase changes

CHEM 29: More phase changes

Do Now at the beginning of class.

Poll

Describe your mood today. Do you feel like water, ice, steam or plasma?

• Water: I go with the flow.

• Ice: I'm nervous, frozen.

• Steam: I'm so angry I'm fuming

• Plasma: I don't really know what I am, but I guess I'm kind of like a gas but charged with ions.

Multiple Choice

Which of these winter traditions in the Netherlands has something to do with a chemical change?

1 Burning a big pile of Christmas trees on New Year's Eve

2 Going ice skating in the Amsterdam city center when the canals freeze

Multiple Choice

Do you remember the name of Ms. Wouters' bunny from earlier this year?

• Odysseus

• Sebastian

Multiple Select

Okay, let's get serious now. Remember physical changes and chemical changes? Which of these are physical changes?

• Souring milk

• Cooking an egg

• Cutting copper wire

• Setting your Christmas tree on fire

• Ice melting into water

Physical changes

Physical changes: The substance stays the same.

When ice melts into water, the water molecules stay the same.

When I cut copper wire, the copper itself doesn't change.

These are physical changes.

Multiple Choice

This weekend I ran 7000 meters. How many kilometers is that?

• 70.00

• 700

• 7

• 1.6

kilo = 1000

(It's very important to know how to calculate with the prefixes. 1 km = 1000 m)

Poll

What chemical profession fits your personality best?

• Designing new medicine

• Making environmentally friendly fuels for cars and airplanes

• Professional Christmas tree burner

• Chemistry teacher

• Geochemist: studying rocks and minerals.

Open Ended

What is it that you actually want to be when you grow up?

Multiple Choice

How would you classify gold?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Multiple Choice

How would you classify milk?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Multiple Choice

How would you classify the substance in the picture?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Cats are liquids?

A liquid is traditionally defined as a material that adapts its shape to fit a container. Cats seem to fit this definition.

Poll

Your opinion! Are cats liquid?

• Yes

• No