WorksheetsS3 - Cracking Hydrocarbons
Total questions: 23
Worksheet time: 27mins
What is the primary purpose of cracking in the petroleum industry?
To break down larger hydrocarbons into smaller, more useful ones
To combine small hydrocarbons into larger ones
To increase the boiling point of hydrocarbons
To purify crude oil
What are the products of cracking?
Only smaller alkanes
Water and carbon dioxide
Only alkenes
Smaller alkanes and an alkene
Which type of hydrocarbon is more useful as fuels?
Smaller hydrocarbons
Both are equally useful
Neither are useful
Larger hydrocarbons
Which of these is correct for smaller hydrocarbons?
Lower boiling points
Variable boiling points
Higher boiling points
No boiling point
What is a key use of alkenes produced from cracking?
In the manufacture of plastics
As a food additive
In water purification
In pharmaceuticals
What equation is correct for the cracking of C12H26?
C + H2
C6H12 + C6H10
C8H18 + C4H8
CH4 + C2H4
Which catalyst is used in catalytic cracking?
Platinum
No catalyst is used
Sulfuric acid
Aluminium oxide
Why is there a high demand for small chain hydrocarbons?
They are more useful as fuels
They are less useful as fuels
They are harder to produce
They are only used in scientific research
What happens to the carbon atoms in the cracking process?
They are rearranged into smaller molecules
They are unchanged
They are removed from the mixture
They are converted into liquid form
What ensures the balance of atoms in the cracking equations?
The reaction does not involve carbon or hydrogen
The number of carbon and hydrogen atoms remains the same before and after the reaction
Atoms are added during the reaction
Atoms are removed during the reaction
Label the cracking the in laboratory diagram correctly.
Trough
Aluminium oxide catalyst
Paraffin + Roksill wool
Delivery tube
Products collected
Organise these options into the right categories
butane
pentane
octane
decane
Complete the following cracking equation:
C12H26 → C2H4 + (a)
C10H22
Complete the following cracking equation:
C12H26 → C6H14 + (a)
C6H12
Complete the following cracking equation:
(a) → C6H14 + C2H4
C8H18
The Chemical Industry Cracking Process
The chemical industry cracking process is a crucial method used to break down complex hydrocarbons into simpler molecules. This process involves the use of heat and catalysts to initiate the breakdown, resulting in the production of valuable products such as gasoline, diesel, and jet fuel.
Cracking can be categorized into different types, including thermal cracking, catalytic cracking, and hydrocracking, each with its unique set of conditions and applications. These methods play a significant role in meeting the global demand for various petroleum products.
One of the key objectives of the cracking process is to maximize the yield of desired products while minimizing the formation of unwanted by-products. This requires careful control of operating conditions and the selection of appropriate catalysts to ensure efficiency and cost-effectiveness.
Overall, the chemical industry cracking process is a sophisticated and essential technique that drives the production of fuels and other valuable chemicals, contributing to the functioning of modern society and industries.
What are the three main cracking methods used in the chemical industry?
Thermal, catalytic, and hydrocracking
Distillation, filtration, and extraction
Oxidation, reduction, and polymerization
Crystallization, evaporation, and sublimation
What is the purpose of the chemical industry cracking process?
To combine hydrocarbons into complex molecules
To break down complex hydrocarbons into simpler molecules
To extract hydrocarbons from natural sources
To store hydrocarbons for future use
What is the main goal of efficient cracking in the chemical industry?
Maximizing desired product yields and minimizing unwanted by-products
Increasing the number of catalysts used
Reducing the overall production cost
Speeding up the cracking process
Which is NOT a property of a long chain hydrocarbon?
Viscous
Flammable
Not very volatile
High boiling point
What is the test for alkenes?
Adding bromine water, if alkene is present it will turn orange
Adding bromine water, if alkene is present it will turn colourless
Adding bromine water, if alkane is present it will turn orange
Adding bromine water, if alkane is present it will turn colourless
Identify the fraction used in tarring roads.
Identify where you would find the Gases (LPG) fraction.
Identify the fraction which would be least viscous (least thick).
Identify the fraction which would be darkest in colour.
Reorder the following from smallest to largest in terms of number of carbons
Gases (LPG)
Naptha
Kerosene
Lubricants and Waxes
Residue
