The second product is an alkene, so it will follow the rule C nH 2n. C 16H 34 is an alkane which can be used as the starting chemical in cracking. One of the products of cracking this compound is an alkane which has 10 carbon atoms in it. Write a balanced symbol equation for this cracking reaction. Elements and Compounds Hydrocarbons Construct an equation to show the cracking of dodecane to make ethene? Is an equation for cracking of ethane to produce. Write a balanced symbol equation for this reaction? Decane is cracked to give octane and ethene. Write a balanced symbol equation with state symbols.

Cracking and alkenes is a reaction in which larger saturated are broken down into smaller, more useful hydrocarbon molecules, some of which are unsaturated: • the original starting hydrocarbons are • the products of cracking include alkanes and, members of a different For example, hexane can be cracked to form butane and ethene: hexane → butane + ethene C 6 H 14 → C 4 H 10 + C 2 H 4 The starting compound will always fit the rule for an alkane, C n H 2n+2. The first will also follow this rule.

The second product will contain all the other C and H atoms. The second product is an alkene, so it will follow the rule C n H 2n. Question C 16 H 34 is an alkane which can be used as the starting chemical in cracking. One of the products of cracking this is an alkane which has 10 carbon atoms in it.

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Write a balanced symbol equation for this cracking reaction. Reveal answer. Butane and ethene are produced Reasons for cracking Cracking is important for two main reasons: • It helps to match the supply of with the demand for them. • It produces alkenes, which are useful as for the industry. Supply and demand The supply is how much of a fraction an oil refinery produces. The demand is how much of a fraction customers want to buy. Very often, of produces more of the larger hydrocarbons than can be sold, and less of the smaller hydrocarbons than customers want.

Smaller hydrocarbons are more useful as than larger hydrocarbons. Since cracking converts larger hydrocarbons into smaller hydrocarbons, the supply of fuels is improved. This helps to match supply with demand.

Alkenes Alkanes and alkenes both form homologous series of hydrocarbons, but: • alkanes are, their carbon atoms are only joined by C-C single bonds • alkenes are, they contain at least one C=C double bond As a result, alkenes are more than alkanes. Alkenes can take part in reactions that alkanes cannot. For example, ethene molecules can react together to form poly(ethene), a. Alkenes will react with bromine water and turn it from orange/brown to colourless. This is the way to test for a double C=C bond in a molecule.

Introduction There are many different ways in which a large hydrocarbon chain can be broken into smaller hydrocarbons. Within fractional distillation the products obtained in the larger fractioning columns, i.e.