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AP Biology: Free Energy and Molecular Building Blocks Drill 1, Problem 1. Which statement incorrectly describes the properties of water?

Language:
English Language

Transcript

00:03

Here's your shmoop du jour...a la Bio.

00:07

Which statement incorrectly describes the properties of water?

00:13

And here are the potential answers...

00:18

Water. H20. That stuff we're all supposed to drink 8 glasses of every day.

00:23

Even those of us with a drinking problem.

00:27

But aside from hydrating our body, it has some other really cool, unique properties

00:30

that are good to know for the AP bio test. And since this is a "which statement incorrectly

00:36

describes" question...

00:37

...we can just look at every single answer choice to determine which one ain't doin'

00:42

it for us. Starting with our first answer choice...is

00:45

water a nonpolar molecule? Well, what does that mean? Does it just like

00:50

the thermostat cranked up to 90? Nope... polarity in science refers to differences

00:55

in charge or ELECTRONEGATIVITY between atoms in a molecule.

01:02

Electronegativity means the tendency to attract electrons. With or without makeup.

01:08

In this problem, it means that if our water molecule were to have a different electronegativity

01:13

around oxygen compared to its two hydrogen atoms, the molecule would be polar.

01:18

Hm ok...so we know that Oxygen is a super electronegative atom, and attracts lots of

01:25

negative charge to it. It's something we should just know and memorize

01:30

because it's one of those things that is just uber-important.

01:33

Hydrogen, on the other hand, does not have a high electronegativity. Sorry, hydrogen.

01:38

We're sure you make up for it by having a great personality.

01:43

So even though there are two hydrogen atoms for one oxygen in every water molecule...

01:48

...the water molecule is still super negative around the oxygen and is unbalanced in charge.

01:54

This difference in charge makes water POLAR. So our answer is A.

01:58

Now start chugging. You've still got 6 glasses to go today.

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