Cracking & Alkenes (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Cracking & Alkenes
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Type of hydrocarbon: saturated, no double bonds

Alkanes

General formula for alkanes

CnH2n+2C_nH_{2n+2}

Type of hydrocarbon: unsaturated, has double bonds

Alkenes

General formula for alkenes

CnH2nC_nH_{2n}

Process breaking long hydrocarbons into shorter ones

Cracking

Products when decane is cracked

Octane and ethene

Cracking method using high temp and catalyst

Catalytic cracking

Cracking method: steam & high temp, no catalyst

Steam cracking

Why is cracking essential?

Higher demand for shorter-chain hydrocarbons

Advantage of shorter hydrocarbons as fuels

More flammable, better fuels

Type of bonds between carbon atoms in alkanes

Single covalent bonds only

Minimum double bonds in alkenes between carbon atoms

At least one

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