Cracking (AQA GCSE Chemistry): Flashcards
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12 cards from this deck
What is cracking?
What is cracking?
Breaking large hydrocarbons into smaller, more useful ones
What type of reaction is cracking?
What type of reaction is cracking?
Thermal decomposition reaction
Why is cracking needed?
Why is cracking needed?
Shortage of small molecules that people want as fuels
Method 1 of cracking
Method 1 of cracking
Pass vapours over a hot catalyst
Method 2 of cracking
Method 2 of cracking
Mix vapours with steam and heat to very high temperatures
Products of cracking
Products of cracking
A shorter alkane and an alkene
How to identify the alkene product
How to identify the alkene product
Fewer H atoms due to double bond
Uses of alkanes from cracking
Uses of alkanes from cracking
Fuels and feedstock for solvents, lubricants, detergents
Uses of alkenes from cracking
Uses of alkenes from cracking
Make polymers (plastics) and other chemicals
Why small hydrocarbons flow better
Why small hydrocarbons flow better
Less viscous (less thick)
Why small hydrocarbons burn easier
Why small hydrocarbons burn easier
More flammable
Why small hydrocarbons vaporise easier
Why small hydrocarbons vaporise easier
Lower boiling points