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Salters DF

Salters DF unit

QuestionAnswer
What is octane number? tendency to auto-ignite
What is an aromatic compound? a compound containing benzene (hexagone with a circle)
What is an aliphatic compound? a compund without benzene
Describe the difference between an AlkAne and an AlkEne Alkane have only single C-C bonds whilst Alkenes have at least one double C=C bond
Describe the difference between an Alcohol and an Ether Alcohol have an O-H group whilst an Ether has the Oxygen surrounded by 2 C
Write the balanced equation for the combustion of Hexane
Write the balanced equation for the combustion of Hexanol
Name 3 ways of increasing octane number isomerisation, reforming, shortening chain
What is isomerisation? 2 chemicals with same molecular formula buit different arrangement of the atoms
What is a catalyst (4 points)? speeds up reactions, without getting used up (mass stays same), by lower activation energy and taking an alternative reaction pathway
What is HETEROGENEOUS catalyst? when the reactants and the catalyst are in different states
Describe how a heterogeneous catalyst works? reactants form BONDS with surface of catalyst (aDsorbtion), BONDS WITHIN reactants weaken/break; new BONDS BETWEEN reactants form; BONDS PRODUCTS-SURFACE weaken and products DESORB
Describe the effect of shortening an Alkane chain on the octane number increase
How is this pollutant formed? CO INCOMPLETE combustion of fossil fuels
How is this pollutant formed? CO2 COMPLETE combustion of fossil fuels
How is this pollutant formed? particulates INCOMPLETE combustion of fossil fuels
How is this pollutant formed? NO in HOT engine when oxygen FROM THE AIR reacts with NItrogen FROM THE AIR
How is this pollutant formed? NO2 Further oxidation of the NO
How is this pollutant formed? SO2 combustion/oxidation of impurities found in Fossil fuels
What is a catalyst poison? a chemical that binds permanently to teh surface of the catalyst; preventing reactants to bind
Describe the cracking experiment vapours of a long chain alkane are passed over a HOT aluminium oxide catalysts
Write the balanced equation for the cracking of Hexane C6H14 --> C2H4 + C4H10 A long chain hydrocarbon has been broken into two smaller molecules: a smaller alkane and an alkene
Write the balanced equation for the reforming of Hexane C6H14 --> C6H12 + H2
What is reforming? formation of a benzene ring
Write the balanced equation for the isomerisation of Hexane Hexane --> Methyl-2 Pentane
What does TEACUPS stand for? Transport Energy Availibility Cost usable Pollution Safety
Which fuel has the highest energy density? Hydrogen
Which fuel can make engines corrode? Ethanol
What is the C=C-C bond angle in Propene? 120
What is the H-C-H bond angle in Methane? 109
Created by: UrsulineChem