How many molecules in a drop of water???

I emailed Apologia and asked them approximately how many molecules of water would be in a drop on the end of one's finger.

Their reply:
"An average size drop of water has about 0.05 ml, and a drop of that size would have 1.7x10^21 molecules."

That's 1,700,000,000,000,000,000,000!

God's creation is AMAZING!!!


Amazing 9-Layer Density Tower!

Amazing!  We did something similar in General Science Module 1, but this is fantastic.  And way prettier.  =)

Source of pic, with instructions and explanation
Used with permission from Steve Spangler

Video demo of how to do this experiment.


Steve Spangler is on facebook


Water Molecules!

While searching for videos for Physical Science Module 5 today, I came across these that go great with Module 4!
Embedding into a website is disabled, so you will have to click these links to watch them.
They have also been added to the Physical Science Module 4 post.

• Water Molecules - part 1 is a great video animation that shows that water molecules are polar, and will hydrogen bond.  Hydrogen bonding is what enables water (H2O) to stay in a liquid form at room temperature (instead of a gas like other H2__ substances).

• Water Molecules - part 2 shows the state of water molecules in liquid form, as a solid, and as a gas.


Basically atoms and elements are the same thing. 
An atom is just the smallest amount of an element.
Read this ice cream analogy.