Molecules and Molarity

Question 1

What are moles?

Answer 1

the number of moles in a system

Question 2

What is molarity?

Answer 2

The concentration of something in a system

Question 3

Note

Answer 3

Molar weight is the same as g if 1 mol

Question 4

Steps to calculate

Answer 4

1) The weight
2) how many moles
3) how much liquid

Question 5

The OH- con. is high

Answer 5

it has a high pH (Base)

Question 6

The OH- con. is low

Answer 6

it has a low pH (acidic)

Question 7

What can molecules vary in?

Answer 7

1) length
2) branching
3) double position
4) rings (benzene)

Question 8

What are sugars?

Answer 8

Sugars (carbs)= saccharide

Question 9

Simple vs complex sugar

Answer 9

Simple: mono & disaccharide like glucose and sucrose
Complex: sugar polymers (polysaccharides) not sweet, starch and cellulose

Question 10

What is the general carb. formula?

Answer 10

Carbohydrates have a formula of CH20

Question 11

Why are sugars useful?

Answer 11

Sugar polymers are used for storage of monomers and structural components –> can’t break down starch and glycogen

Question 12

Characteristics of lipids

Answer 12

High in carbon and hydrogen, low in oxygen, nitrogen and potassium.

• -> hydrophobic
• ->not soluble

Question 13

What do fatty acids do?

Answer 13

Fatty acids form parts of fats and oils w/glycerol

Question 14

Saturated?

Answer 14

no double bonds in tail

Question 15

Unstaturated?

Answer 15

Greater than 1 double bonds in tail

Question 16

Role of lipids 6?

Answer 16

• energy storage
• insulation and protection
• digestion and absorption
• nutrition (vitamin A,D,K)
• cell membrane structure derived vesicles
• hormone production

Question 17

Characteristics of DNA

Answer 17

BASE

- rings, nitrogens, phosphate, NH2 carbonal group

Question 18

Why can we break down starch but not cellulose

Answer 18

The body can’t break down cellulose because the OH in the structures have bee flipped, the human body doesn’t have an enzyme to recognise it.