Review

Question 1

The major non-metals in Biology

Answer 1

Carbon(C), Hydrogen(H), Oxygen(O), Nitrogen(N),Phosphorus, Sulfur,Chlorine, Iodine

Question 2

The major metals in Biology

Answer 2

Sodium(Na),Potassium(K),Magnesium(Mg),Calcium(Ca),Iron(Fe)

Question 3

How can polar covalent bonds

Answer 3

The electrons are shared unequally. polar covalent bonds have partially negative and positive charges.

Question 4

Non-polar covalent bonds

Answer 4

When electrons are not shared equally

Question 5

Polar covalent bonds

Answer 5

When a pair of electrons are shared unequally

Question 6

Ionic Bonds

Answer 6

When electrons are transferred from one atom to another to stabilize itself. Atoms are held together by an attraction between negatively and positively charged ions. (gives away electrons)

Question 7

Electronegativity

Answer 7

Is the measure of how much an atom “likes” an electron

Question 8

Covalent bonds

Answer 8

a chemical bond in which two atoms share elelctrons to fill their octet rules by sharing electrons. (shares electrons)

Question 9

What allows hydrogen to form bonds?

Answer 9

Polar covalent bonds allows hydrogen bonds to form because of the partial negative and positive charges. H-bonds are indicated by dashed lines while covalent bonds are indicated by solid lines

Question 10

Hydrophobic molecules

Answer 10

Molecules that repel or fail to mix with water. (Non-polar) ex: water does not mix with oil

Question 11

Hydrophilic molecules

Answer 11

Molecules that have a tendency to mix, dissolve and be wetted by water. (Polar) ex: sugar dissolves in water