ethene: CH2=Ch2
propene: CH2=CH3CH
There is nowhere else to place a double bond! (C=C)
No number is used in the names ethene and propene because the number would be useless as the double bond is located at carbon "1"
The main uses of Ethene (common name ethylene) and propene (common name propylene) is in the synthesis of polyethylene and polypropylene. They are also used in the synthesis of other chemicals. Propene is used to make epoxy resins for example. Butane and pentane are used as fuels and also in chemical synthesis.
Ethene is used industrially more than chloroethane because ethene is a key building block in the production of many important chemicals such as polyethylene, which has a wide range of industrial applications. Chloroethane, on the other hand, is less versatile and has limited industrial uses compared to ethene. Additionally, ethene can be produced more cost-effectively and in larger quantities compared to chloroethane.
Bromine water test is used to show that ethene is unsaturated. In the presence of ethene, the red-brown color of bromine water disappears due to addition reaction with ethene, indicating its unsaturation.
The raw material needed to make ethene is crude oil or natural gas, which are sources of hydrocarbons. Ethene is primarily produced through the process of steam cracking, where hydrocarbons are heated at high temperatures to break them down into smaller molecules, including ethene.
If your question is "Why is Acetylene and Oxygen used for welding/cutting NOT Oxygen and air"? This is why. Acetylene and air mixed in correct proportions produces a flame temperature of 4500F to 4800F degrees. Acetylene mixed with Oxygen in the correct proportions produces a flame well above 5500F degrees. This extra heat melts the metal faster and increases the speed you can cut or weld. Other gasses instead of Acetylene are used but do not produce as high a temperature. Oxygen is almost always used with these other gasses.
The main uses of Ethene (common name ethylene) and propene (common name propylene) is in the synthesis of polyethylene and polypropylene. They are also used in the synthesis of other chemicals. Propene is used to make epoxy resins for example. Butane and pentane are used as fuels and also in chemical synthesis.
Ethene can react with Bromine water - turns colourless
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To convert propene into propane, a hydrogenation reaction is used. This process involves adding hydrogen (H₂) to propene (C₃H₆) in the presence of a catalyst, such as nickel, palladium, or platinum, under appropriate temperature and pressure conditions. The reaction reduces the double bond in propene, resulting in the formation of propane (C₃H₈).
ethene
Ethene is used industrially more than chloroethane because ethene is a key building block in the production of many important chemicals such as polyethylene, which has a wide range of industrial applications. Chloroethane, on the other hand, is less versatile and has limited industrial uses compared to ethene. Additionally, ethene can be produced more cost-effectively and in larger quantities compared to chloroethane.
Bromine water test is used to show that ethene is unsaturated. In the presence of ethene, the red-brown color of bromine water disappears due to addition reaction with ethene, indicating its unsaturation.
The raw material needed to make ethene is crude oil or natural gas, which are sources of hydrocarbons. Ethene is primarily produced through the process of steam cracking, where hydrocarbons are heated at high temperatures to break them down into smaller molecules, including ethene.
Methane, ethane, and propane are used primarily as fuels; they are, in decreasing order, the most common constituents of natural gas. Propene, like most other unsaturated hydrocarbons, can be used as a fuel, but generally is not, because it is more economically valuable as a starting material for making more valuable products such as iso-propyl alcohol.
Ammonia = iron catalyst
Ethane has two carbon atoms and six hydrogen atoms (C2H6). It is a flammable gas and is a saturated molecule, meaning that each carbon atom has four bonds linked to 4 other atoms. Methane (CH4), propane (C3H8) and butane (C4H10) are similar molecules and all are flammable gases. Ethene has two carbon atoms and four hydrogen atoms (C2H4). It is also a gas but it is an unsaturated molecule: the two carbon atoms are linked by a double bond. Ethene molecules can join together into a single, long molecule. The result is a string of carbon atoms that each have two hydrogen atoms attached and are also linked to two other carbon atoms. This is polythene or polyethelene, a simple polymer that is used for plastic bags among other things. The ability to form into long chains is due to the double bond between the carbon atoms in the ethene molecule.
If your question is "Why is Acetylene and Oxygen used for welding/cutting NOT Oxygen and air"? This is why. Acetylene and air mixed in correct proportions produces a flame temperature of 4500F to 4800F degrees. Acetylene mixed with Oxygen in the correct proportions produces a flame well above 5500F degrees. This extra heat melts the metal faster and increases the speed you can cut or weld. Other gasses instead of Acetylene are used but do not produce as high a temperature. Oxygen is almost always used with these other gasses.