Perhaps this may help you in your search for causes. A high hydrocarbon reading is usually unburnt fuel. If the CO reading and the NOx readings are below the limit then look towards an ignition problem as being the most likely culprit. As the prior answer suggested, start checking items and begin with the basics. Year, make model, engine size, options, symptoms etc will help you get a more accurate answer next time.
Check the plugs first, all of them! One bad plug will give you a miss and everytime the car misfires unburnt gas goes into the cylinder and out the exhaust which raises the HC. Same goes for the wires (check resistance with a multimeter) check the distributor cap & rotor (if applicable) for cracks, corrosion or burnt areas. Might want to do an injector service (if applicable), a sticky injector might put fuel in at times when its not supposed to and up goes the HC. If the check engine light is on 1st thing to do is pull some codes and this will give you some direction. Codes can be pulled manually by using the diagnostic connector or a scanner.
High hydrocarbon levels are also seen with a much too lean mixture. If you are looking at an older carburated car, check this first. A lean mixture will not burn completely, and unburned mix goed out the tailpipe. An overly rich mixture burns fine, but to carbon monoxide, not dioxide. So a rich mixture will fail on CO, not HC. This is the reason for the vacuum hose fix - it cuts down the amount of air entering the engine, while leaving the fuel the same ( or increasing it a little if the leaks are really bad ). This said, the ignition system is also suspect, as any misfire will increase HC. So, check your vacuum hoses (lightly spray connections w/ carb cleaner, an RPM increase means a leak), change your plugs and wires if they're more than a year old, and richen the mixture a hair if this adjustment is available.
I had to replace a lot of vacume lines to get mine to pass. It also could be o2 sensor, bad spark plugs, rich idle(too much gas), bad spark plug wires, bad injectors(or carburetor), bad ignition coil/cap/rotor(weak spark), bad catalytic converter/clogged muffler, exhaust leak, etc.
Long hydrocarbons generally do not make good fuels because it requires more energy to produce fuels using them. This makes long hydrocarbons far less efficient than other fuel sources.
What two hydrocarbons are used to make plastic
Because hydrocarbons are a whole (referring to fractions) and the molecules (represent the fraction) that make up the whole are carbon and hydrogen CH4 this means that the hydrocarbons consist of 1carbon and 4 hydrogen molecules.
Hydrocarbons may be considered as nonpolar molecules.
Hydrocarbons burn easily and release heat.
Cracking hydrocarbons is very important because in order to power our cars and warm our homes we have to use crude oil which is cracked into smaller hydrocarbons which make diesel and petrol and other types of fuels for our homes and environment. :)
no. hydrocarbons make up crude oil and in combustion they are burnt to make CO2
Yes they do because they burn easily yeaaaayyy lol x =] save:)
To burn as a fuel (petrol, methane etc.), to make plastics, to cover roads, to make lubricant (don't laugh) and solvent waxes. Without hydrocarbons we would have no oil which is humans biggest fuel source.
Because they need high temperatures to be cracked which uses more fuel
Covalent bond between Carbon and Hydrogen store considerable amounts of energy,hydrocarbons make good fuels. Gasoline for example is rich in hydrocarbons.
you have to write what you think about the question
Hydrocarbons are precursors.
to make carbon dioxide and water
Because hydrocarbons have non polar molecules and water has a polar molecule.Hydrocarbons, which are molecules that are composed entirely of only Hydrogen & Carbon, which should make sense from the name. From a simple standpoint, it should make sense that these species are hydrophobic (ie: insoluble in water) because they not polar species. Carbon holds its electrons tightly. Water is a polar solvent because of the non-bonding electrons on the oxygen (H2O). Two substances are soluble with each other when they are either both polar (hydrophilic) or both nonpolar (hydrophobic).
Hydrocarbons have a few unique properties that make them identifiable. They are mostly are flammable, they can form polymers, and they weigh less than water.
Petrol, is different from Kerosene because the hydrocarbons that you find in Petrol will generally have less hyrdogen and carbon atoms than Kerosene would have. E.g. the hydrocarbons that make up Petrol may have in between 4 to 12 carbon and 10 to 26 hydrogen atoms, whereas Kerosene would have between 6 to 16 carbon and 14 to 34 hydrogen atoms.
yes, because divers take pieces of to make jewelry, and fishermen don't follow regulations. Also because of pollution.
shorter hydrocarbon chains are easier to ignite, less viscous, a lower boiling point and more volatile. this makes them more useful, so longer chains are often cracked to make the smaller hydrocarbons
Students who have a sincere desire to learn can do so without needing rules or regulations, but those students who would rather be doing something else, are in need of rules and regulations to make their education work. Therefore, as long as school is intended to provide education to everyone, it needs rules and regulations.
I think it because there is more energy needed in order to break down the bonds in the hydrocarbon. Making it less efficient for fuels
Yes, they do!