AP Biology 1.1 Free Energy and Molecular Building Blocks
AP Biology: Free Energy and Molecular Building Blocks Drill 1, Problem 1. Which statement incorrectly describes the properties of water?
|AP Biology||Free Energy and Molecular Building Blocks|
|Test Prep||AP Biology|
But aside from hydrating our body, it has some other really cool, unique properties
that are good to know for the AP bio test. And since this is a "which statement incorrectly
...we can just look at every single answer choice to determine which one ain't doin'
it for us. Starting with our first answer choice...is
water a nonpolar molecule? Well, what does that mean? Does it just like
the thermostat cranked up to 90? Nope... polarity in science refers to differences
in charge or ELECTRONEGATIVITY between atoms in a molecule.
Electronegativity means the tendency to attract electrons. With or without makeup.
In this problem, it means that if our water molecule were to have a different electronegativity
around oxygen compared to its two hydrogen atoms, the molecule would be polar.
Hm ok...so we know that Oxygen is a super electronegative atom, and attracts lots of
negative charge to it. It's something we should just know and memorize
because it's one of those things that is just uber-important.
Hydrogen, on the other hand, does not have a high electronegativity. Sorry, hydrogen.
We're sure you make up for it by having a great personality.
So even though there are two hydrogen atoms for one oxygen in every water molecule...
...the water molecule is still super negative around the oxygen and is unbalanced in charge.
This difference in charge makes water POLAR. So our answer is A.
Now start chugging. You've still got 6 glasses to go today.