Fichas
Chemical Reactions of the Alkanes
Fichas del conjunto (24)
- 1Draw the two types of bond in an alkaneC-C and C-H bonds
All sigma bonds - 2Why are Alkenes fairly unreactive?- They have strong C-C bonds and C-H bonds
- C-C bonds are non-polar
- The electronegativity of C and H is so similar the C-H bond can also be considered non-polar - 3Alkanes can take part in an exothermic reaction. What is the name of this reaction?Combustion
- 4Name the products when an alkane is burned in a plentiful supply of oxygen- Carbon Dioxide
- Water - 5Write out the word equation for the combustion of Ethane in a plentiful supply of OxygenEthane + Oxygen --> Carbon Dioxide + Water
- 6Write out the symbol equation for when methane reacts with oxygen in a plentiful supply of oxygen. Include State Symbols.CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (l)
- 7Name the 3 products that can be produced when an alkane is burned in a limited supply of oxygenWater (H2O)
Carbon Monoxide (CO)
Carbon (C) (solid) - 8Why is carbon dioxide hard to detect and dangerous?It is hard to detect as it is colourless and odourless. It is dangerous because it is highly toxic.
- 9Write out a symbol equation for the reaction between Heptane and oxygen in a limited supply of O2. (Include state symbols)C7H16 (g) + 7.5O2 (g) --> 7CO (g) + 8H2O (l)
- 10When an alkane reacts with a halogen, what provides the initial energy to start the reaction?UV radiation
- 11Reacting an alkane with a halogen is an example of what type of reaction?Substitution reaction
- 12Draw out the symbol equation for when methane is reacted with bromine. (1 mark for correct equation) (1 mark for correct state symbols)CH4 (g) + Br2 (l) --> CH3Br (g) + HBr (g)
- 13What is the name of the mechanism for the bromination of alkanes?Free Radical Substitution
- 14What is the first step called in the mechanism for the bromination of alkanes?Initiation
- 15The covalent bond in the bromine molecule is broken by what process? Where do the electrons go?Homolyctic Fission
One electron from the (now broken) covalent bond goes to each Bromine atom - 16What is the end product of the initiation stage?two bromine radicals
- 17Radicals don't have an electron pair, they just have one electron. What does this mean?They are extremely reactive and unstable
- 18What is the second step in free radical substitution called?Propagation (there could be a couple of propagation steps)
- 19Describe the first propagation step for the free radical substitution between bromine and methane Write a symbol equation for itBromine radical reacts with a C-H bond in methane to form a methyl radical (CH3') and a molecule of hydrogen bromide
CH4 + Br' --> CH3Br' + HBr - 20Describe the second propagation step for the free radical substitution between bromine and methane Write an equation for itEach methyl radical reacts with a molecule of Bromine to form bromomethane (CH3Br) and another *bromine radical (Br')
*This new bromine radical means that the propagation steps can occur again and that is why it is a chain reaction
CH3' + Br2 --> CH3Br + Br' - 21What is the third step of free radical substitution called?Termination
- 22What happens in the final step of free radical substitutionTwo radicals react to form an element/compound with an electron pair
- 23Give three examples of termination stepsBr' + Br' --> Br2
CH3' + CH3' --> C2H6
CH3' + Br' --> CH3Br - 24Methane and Ethane have only one monosubstituted product. How many does monosubstituted isomers does pentane have?Three monosubstituted isomers.
1-bromopentane
2-bromopentane
3-bromopentane
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- AS - Level (12 - Alkanes) Chemistry Fichas sobre Chemical Reactions of the Alkanes, creado por Bee Brittain el 23/03/2016.
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- Bee Brittain
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