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Cracking long-chained hydrocarbons produces two things which include alkenes and alkanes(shorter chains), including hydrogen through catalytic cracking.

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Q: Cracking long-chained hydrocarbons produces what two things?
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Which two things are needed to crack hydrocarbons?

Heat and Alkenes


Why is cracking needed?

by cracking hydrocarbons which are mostly alkanes, shorter alkanes can be created, which are better at igniting, and less viscous, this means they are usefuel fuels and so more valuble than the fractions containg longer chain alkanes, which there before cracking. (things that were produced before cracking but after the fractional distillation stage, are things like parrafim) (cracking also produces alkenes which are used for plastics, so it is also useful in that way, but most useful for fuel. This is because there is more demand for fuel and if there was no cracking the demand could not be met) the method of cracking: Cracking involves breaking covalent bonds that look like this, C-C, the hydrocarbons are then heated to vaporise them, they are then passed over a hot catalyst. this means cracking is a thermal decomposition reaction. however much energy is needed to break covalent bonds between the atoms. You are also able to test for alkanes and alkenes is bromine water. If something is unsaturated (alkene) then if it is places in bromine water, which is bright orange it will turn colourless, but if a saturated substance is there (alkane) then it will not chnage. This therefore shows whether a substance is an alkene or alkane. This shows cracking a hydrocarbon, --> that symbol represents an arrow, symbolising heat being used. H H H H H H H H H H H H H H H H | | | | | | | | | | | | | | | | H-C-C-C-C-C-C-C-C-H --> C=C + H-C-C-C-C-C-C-H | | | | | | | | | | | | | | | | H H H H H H H H H H H H H H H H (This is a longer alkane) (alkene, used (Shorter Alkane, used 4 fuels) for plastics)


When air molecules collide with things around us it produces what?

This is the origin of air pressure.


What produces carbon?

Many things produce carbon dioxide. Burning fossil fuels like oil, coal, gas are one of the main ways it is produced.


What are the 4 most common elements in most living things?

7 characteristics that all living things have:1. requires oxygen2. requires nutrience3. requires water3. produces waste4. reproduces5. grows as it get older6. reacts to the changes in the environment7. movesCarbon,hydrogenoxygennitrogenphosphoroussulfuriron

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Which two things are needed to crack hydrocarbons?

Heat and Alkenes


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Why is cracking needed?

by cracking hydrocarbons which are mostly alkanes, shorter alkanes can be created, which are better at igniting, and less viscous, this means they are usefuel fuels and so more valuble than the fractions containg longer chain alkanes, which there before cracking. (things that were produced before cracking but after the fractional distillation stage, are things like parrafim) (cracking also produces alkenes which are used for plastics, so it is also useful in that way, but most useful for fuel. This is because there is more demand for fuel and if there was no cracking the demand could not be met) the method of cracking: Cracking involves breaking covalent bonds that look like this, C-C, the hydrocarbons are then heated to vaporise them, they are then passed over a hot catalyst. this means cracking is a thermal decomposition reaction. however much energy is needed to break covalent bonds between the atoms. You are also able to test for alkanes and alkenes is bromine water. If something is unsaturated (alkene) then if it is places in bromine water, which is bright orange it will turn colourless, but if a saturated substance is there (alkane) then it will not chnage. This therefore shows whether a substance is an alkene or alkane. This shows cracking a hydrocarbon, --> that symbol represents an arrow, symbolising heat being used. H H H H H H H H H H H H H H H H | | | | | | | | | | | | | | | | H-C-C-C-C-C-C-C-C-H --> C=C + H-C-C-C-C-C-C-H | | | | | | | | | | | | | | | | H H H H H H H H H H H H H H H H (This is a longer alkane) (alkene, used (Shorter Alkane, used 4 fuels) for plastics)


What are the things that produces sound?

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Is cracking your knuckles healthy?

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What physical property of hydrocarbons is used in fractional distillation?

Different molecules have different boiling points. However this is not a property unique to hydrocarbons, many other things can also be separated by fractional distillation.


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