Organic Chemistry

Question 1

What are the three types of displaying formula?

Answer 1

Molecular formula
Structural formula
Displayed formula

Question 2

Complete the sentence: Crude oil is a dark _______ ______ that is a mixture of hydrocarbons of different lengths.

Answer 2

Viscous liquid

Question 3

How long does it take to make crude oil?
A: 10 Years
B: 100 Years
C: Thousands of years
D: Millions of years

Answer 3

D. Crude oil takes millions of years as it takes time for the animals to form crude oil

Question 4

How was crude oil formed?

Answer 4

There were animals and plants in the sea. When they die they fall to the bottom of the ocean. They get covered in mud. Over time, layers of rock builds up on top. The rocks put the dead organism in hot, high pressure, low oxygen conditions. Over millions of years, these conditions formed crude oil

Question 5

What are hydrocarbons?

Answer 5

A compound made up of only hydrogen and carbon atoms

Question 6

What is fractional distillation?

Answer 6

It is a way to separate a mixture of liquids by boiling the substance, then condensing and collecting it.

Question 7

What are the 2 most simple types of hydrocarbons?
A: Hydrogen and Carbon
B: Saturated and unsaturated
C: Alkanes and Alkenes
D: Methane and Ethene

Answer 7

C. A are the components of Hydrocarbons, B are describing their bonding structure and D is saying the 3 simplest hydrocarbons, not the simplest types.

Question 8

What are the first 4 alkanes

Give them in order

Answer 8

Methane, Ethane, Propane, Butane

Question 9

What does homologous series mean?

Answer 9

A group of compounds with similar chemical properties, same functional group, same general formula.

Question 10

What is the general formula for alkanes?

Answer 10

CnH2n+2

Question 11

What is the general formula for alkenes?

Answer 11

CnH2n

Question 12

If an alkanes had 10 Carbon atoms, how many hydrogen atoms will it have?

Answer 12

22

Question 13

If an alkane had 7 carbon atoms, how many hydrogen atoms will it have?

Answer 13

16

Question 14

If an alkene had 2 Carbon atoms, how many hydrogen will it have?

Answer 14

4

Question 15

If an alkene had 16 Hydrogen atoms, how many Carbon atoms will it have.

Answer 15

8. If you got it wrong, read the question.

Question 16

Are alkanes saturated or unsaturated?

Answer 16

Alkanes are saturated

Question 17

Are alkenes saturated or unsaturated?

Answer 17

Alkenes are unsaturated

Question 18

Why are alkenes more reactive than alkanes?

Answer 18

They contain double bonds.

Question 19

What does saturated mean?

Answer 19

It means that there are no double bonds, only single bonds

Question 20

What does unsaturated mean?

Answer 20

It means that there is at least one carbon-carbon double bond

Question 21

Where can we see that alkenes are more reactive than alkanes?

Hint: Where does alkane not react with something but alkene does?

Answer 21

Bromine water

Question 22

(TRENDS) Boiling point?

Answer 22

Longer alkanes have higher boiling points

Question 23

(TRENDS) Volatility?

Answer 23

Shorter alkanes are more volatile

Question 24

(TRENDS) Flammability?

Answer 24

Shorter alkanes are more flammable

Question 25

(TRENDS) Viscosity?

Answer 25

Longer alkanes are more viscous

Question 26

What is one of the main uses for hydrocarbons?

Answer 26

Fuel

Question 27

What are the two types of combustion?

Answer 27

Complete and Incomplete combustion

Question 28

What is complete combustion:
A: When there is insufficient oxygen
B: When there is sufficient oxygen

Answer 28

B. No explanation needed.

Question 29

What is incomplete combustion?

Answer 29

When there is insufficient oxygen

Question 30

Whish is healthier, unsaturated or saturated?

Answer 30

Unsaturated fats

Question 31

Why are unsaturated fats healthier than saturated fats?

Answer 31

Unsaturated fats lead to higher HDL in the body, which absorbs and removes Cholesterol from the body.

Question 32

What does saturated fats lead to in the body

Answer 32

Cardio-vascular diseases

Question 33

Are unsaturated fats solid or liquid at room temp?

Answer 33

Liquid

Question 34

Are saturated fats solid or liquid at room temp?

Answer 34

Solid

Question 35

What is the extra part of a fat called?

Answer 35

Carboxylic acid

Question 36

(TRENDS) Flames type?

Answer 36

Shorter alkanes have cleaner flame

Question 37

(TESTS) Bromine water alkane positive result?

Answer 37

Stays orange, no color change

Question 38

(TESTS) Bromine water alkene positive result?

Answer 38

Decolorizes Bromine water

Question 39

(TESTS) KMnO4 alkane positive result?

Answer 39

Stays purple, no color change

Question 40

(TESTS) KMnO4 alkene positive result?

Answer 40

Decolorizes Potassium Permanganate

Question 41

What feature of alkanes does fractional distillation rely on?

Answer 41

Different boiling points

Question 42

Are the fractions from fractional distillation pure or mixture and why?

Answer 42

Mixture, it condenses over a range of temperatures.