Cracking

Question 1

What is cracking in chemistry?

Answer 1

Cracking is the process of breaking down larger hydrocarbon molecules into smaller, more useful molecules.

Question 2

True or False: Cracking is used to produce heavier hydrocarbons.

Answer 2

False

Question 3

What are the two main types of cracking?

Answer 3

Thermal cracking and catalytic cracking.

Question 4

Fill in the blank: The main feedstock for cracking is _______.

Answer 4

crude oil

Question 5

What is the primary product of cracking?

Answer 5

Alkanes and alkenes.

Question 6

Which type of cracking involves high temperatures and pressures?

Answer 6

Thermal cracking.

Question 7

What is the role of a catalyst in catalytic cracking?

Answer 7

To lower the activation energy and increase the rate of reaction.

Question 8

What is the typical temperature range for thermal cracking?

Answer 8

450 to 750 degrees Celsius.

Question 9

True or False: Alkenes are more reactive than alkanes.

Answer 9

True

Question 10

What is the main advantage of catalytic cracking over thermal cracking?

Answer 10

It produces a higher yield of gasoline and lower molecular weight hydrocarbons.

Question 11

What type of hydrocarbon is primarily produced from cracking processes?

Answer 11

Short-chain hydrocarbons.

Question 12

Multiple Choice: Which of the following is NOT a product of cracking? A) Ethylene B) Propane C) Octane D) Methanol

Answer 12

D) Methanol

Question 13

What are the environmental concerns associated with cracking?

Answer 13

Air pollution and greenhouse gas emissions.

Question 14

True or False: Cracking can be used to produce fuel for vehicles.

Answer 14

True

Question 15

What is the significance of the cracking process in the petroleum industry?

Answer 15

It helps meet the demand for lighter fuels and petrochemicals.

Question 16

What is the process called that converts alkenes back into alkanes?

Answer 16

Hydrogenation.

Question 17

Fill in the blank: The presence of ______ helps to facilitate catalytic cracking.

Answer 17

a catalyst

Question 18

What is the purpose of using a zeolite catalyst in catalytic cracking?

Answer 18

To enhance selectivity and yield of desired products.

Question 19

What is the difference between saturated and unsaturated hydrocarbons?

Answer 19

Saturated hydrocarbons contain only single bonds, while unsaturated hydrocarbons contain double or triple bonds.

Question 20

Multiple Choice: Which product is primarily used for making plastics? A) Ethylene B) Octane C) Methanol D) Hexane

Answer 20

A) Ethylene

Question 21

What is the main characteristic of alkenes that makes them reactive?

Answer 21

The presence of a carbon-carbon double bond.

Question 22

True or False: Alkenes can undergo addition reactions.

Answer 22

True

Question 23

What is the general formula for alkenes?

Answer 23

CnH2n.

Question 24

What type of reaction is cracking classified as?

Answer 24

A decomposition reaction.

Question 25

What is the main byproduct of the cracking process?

Answer 25

Soot and other hydrocarbons.

Question 26

Fill in the blank: Catalytic cracking primarily occurs in a _______.

Answer 26

fluidized bed reactor

Question 27

What is a common use for the products obtained from cracking?

Answer 27

Fuel for cars and as feedstock for chemical synthesis.

Question 28

What is the effect of temperature on the yield of products from cracking?

Answer 28

Higher temperatures generally increase the yield of smaller hydrocarbons.

Question 29

True or False: Cracking is an endothermic reaction.

Answer 29

True

Question 30

What is the role of steam in steam cracking?

Answer 30

To help break down the hydrocarbons and increase yields of lighter products.

Question 31

Multiple Choice: Which of the following is a common catalyst used in catalytic cracking? A) Nickel B) Platinum C) Copper D) Iron

Answer 31

B) Platinum