Flashcards
Chem 2 Equilibria
Cards in this deck (24)
- 1What is dynamic equilibrium?A reaction where the concentrations of reactants and products stays constant and the rate of the forward and backward reactions are the same.
- 2What is meant by the phrase ' the equilibrium lies to the left'?The equilibrium mixture contains mostly reactants.
- 3State Le Chatelier's principle.If a system at equilibrium is disturbed, the position of equilibrium moves in the direction that tends to reduce the disturbance.
- 4What colour is nitrogen dioxide?brown
- 5Write an equation for the decomposition of dinitrogen tetraoxide.N2O4(g)<==>2NO2(g)
- 6In the decomposition of dinitrogen tetraoxide, what will happen in a syringe if the pressure is decreased?The mixture becomes paler because the concentration of NO2 had been decreased, but after some time the brown colour re-appears because the position of equilibrium had been shifted to the right, hence producing more NO2.
- 7Name three uses of ammonia.1. fertilisers (ammoniun nitrate)
2.drugs
3. making nylon - 8What is the catalyst used in the Haber Process?Iron catalyst
- 9Name three raw materials required to make ammonia:air,water and methane
- 10What are the conditions required for the Haber process?200atm, 400-450C
- 11Why is temperature compromised in the Haber Process?A low temperature produced a high yield but if the temperature is too low, the rate of reaction will be too slow.
- 12Why is pressure a compromise in the Haber Process?Pressure cant be too high or else the plant will become too expensive to run.
- 13Name two processes by which ethanol is produced.Fermentation of glucose and the hydration of ethene.
- 14What catalyst is used in the hydration of ethene?Phosphoric acid
- 15State the conditions required for the hydration of ethene.570K
6500kPa - 16The method by which ethene is hydrated produces a low yield. What is done to increase this yield?The unreacted reactants are recycled.
- 17Why can pressure not be too high in the hydration of ethene?Under high pressure ethene will polymerise to form polyethene.
- 18Why can't the concentration of steam not be too high?A high concentration of steam will dilute the phophoric acid catalyst.
- 19What is meant by the term 'chemical feedstock'?a starting material for making other chemicals.
- 20Name a use of methanolFuel - biodiesel.
- 21What is the typical yield for the production of methanol?5%-10%
- 22What are the conditions required for making methanol?500K
10000kPa - 23Is the production of methanol, endo or exothermic?Exothermic
- 24Is the Haber Process endo or exothermic?Exothermic.
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- a level Chemistry Flashcards on Chem 2 Equilibria, created by sferrier96 on 05/02/2015.
- Created by
- sferrier96 · Feb 2015
- Updated
- Feb 19, 2016
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