What are alkenes?, Alkenes are a homologous series of unsaturated hydrocarbons with general molecular formula of CnH2n., In alkenes, the atoms are joined together by what type of bonds?, Covalent bonds, Why do alkenes have low boiling points?, Low amount of energy is required to overcome the weak intermolecular forces of attraction., What is the chemical name and molecular formula of an alkene with two carbon atoms? What is its state at room temperature and pressure?, Ethene, C2H4, gas, What is the chemical name and molecular formula of an alkene with three carbon atoms? What is its state at room temperature and pressure?, Propene, C3H6, gas, What is the chemical name and molecular formula of an alkene with four carbon atoms? What is its state at room temperature and pressure?, Butene, C4H8, gas, What are the reactions of alkenes?, (1) Combustion, (2) Hydrogenation (Addition with H2), (3) Bromination (Addition with Br2), What is the name of the reaction when alkene burns in oxygen?, Combustion, Write a balanced equation for the reaction between ethene and oxygen., What is the name of the reaction between alkene and bromine?, Bromination (Addition with Br2), What is produced when ethene reacts with bromine?, 1,2-dibromoethane, What is the name of the reaction between alkene and hydrogen gas?, Hydrogenation (Addition with H2), What conditions are required for hydrogenation?, 150 degC, nickel catalyst, What is produced when alkene reacts with hydrogen gas?, Alkane, What is produced when propene reacts with hydrogen gas?, Propane, Write a balanced chemical equation for the reaction between ethene and hydrogen gas., What manufacturing process make use of hydrogenation?, Conversion of unsaturated vegetable oils into margarine to form a solid product., What is cracking?, Cracking is the process in which larger hydrocarbon molecules are broken into smaller hydrocarbon molecules., What conditions are required for cracking?, In the presence of a catalyst, and at high temperatures., What type of fractions are in greater demand? Why?, What are produced during cracking of larger alkane molecules?, Shorter-chain alkanes, alkenes and hydrogen gas, What type of hydrocarbons are saturated?, Alkanes, What type of hydrocarbons are unsaturated?, Alkenes, How can we test whether an unknown hydrocarbon is unsaturated? What will be observed if the unknown hydrocarbon is unsaturated?, By using aqueous bromine. Reddish brown aqueous bromine decolourises., What substance contains hydrocarbon chains with two or more carbon-carbon double bonds in each chain?, Polyunsaturated fats

Alkenes

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