Chemistry Review

Question 1

What is electronegativity?

Answer 1

The measure of an atoms attraction to shared electrons (strength of attraction)

Question 2

When EN is high…

When EN is low…

Answer 2

High: attraction to electrons in a covalent bond creates a slightly negative charge

Low: creates a slightly positive charge

Ex H2O : H slightly positive, O slightly negative

Question 3

What is a polar molecule?

Answer 3

Unequal sharing of electrons

Question 4

A molecules biological function is determined by 3 factors

Answer 4

1. Overall molecular shape
2. Molecular polarity
3. Type of bond

Question 5

Water is _____

Answer 5

Polar

Question 6

Water molecules forming with other water molecules is called

Answer 6

Cohesion

Question 7

Water molecules form hydrogen bonds with other polar molecules is called

Answer 7

Adhesion

Question 8

What kind of bond is very biologically significant?

Answer 8

Hydrogen bonds

Question 9

Why do pants get wet after walking through short, dewy grass ?

Answer 9

Polar molecules attract polar, therefore cotton molecules in pants attract hydrogen bonds in the water

Another example is paper towel