Acids amp; Alkalis - Chemistry Resources for IB AP Alevel 酸amp；碱化学资源的IBAP普通教育

,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Equilibrium&The Haber Process,GCSE REVISION,1.What does Reversible Reaction mean,?,A reaction that can proceed in both directions,2.a.What does the Haber Process make?b.Give one use of this product,Ammonia,To make fertilisers,3.,There are Three Raw Materials for the Haber Process.What are they?,Nitrogen is easily obtained from air by fractional distillation,Hydrogen is obtained from methane reacted with steam.,methane+steam carbon dioxide+hydrogen.,CH,4,(g)+2H,2,O(g)CO,2,(g)+4H,2,(g),The raw materials are thereforeair-for nitrogen,methane and water-for hydrogen.,4.Write the word/balanced chemical equation for the Haber Process.,nitrogen +hydrogen ammonia(+heat),N,2,(g)+3H,2,(g)2NH,3,(g)(+heat),5.In a Reversible Reaction,how can the Yield be Changed?,Change the conditions(use of temperature,pressure and catalyst).,This is a useful summary for any reversible reactionincluding the,Haber Process,.,1.,Increasing the temperature,favours the endothermic reaction.,2.,Increasing the pressure,favours the smaller volume.,3.,Using a catalyst,gives the equilibrium conditions more quickly.,6.Why is the Haber Process run at 450 C instead of room temperature?,To increase rate of reaction,7.Why is the Haber Process run at High Pressure?Give two reasons.,Increasing the pressure(from,Le Chateliers Principle,)makes the equilibrium mixture have more ammonia.,I,ncreased pressure,also increases the reaction rate.,8.Why is the Haber Process not run at Very High Pressure?,Too expensive,9.Which Substance is used as a Catalyst in the Haber Process?,Iron catalyst,The following questions are,Higher,Tier,only,10.Use Le Chateliers Principle to explain what happens as a Product is removed,If you remove a product,the,equilibrium mixture,changes to make more product.,It tries to get back to the composition it had before the product was removed.,You can carry on removing productuntil all the reactants have turned into product,11.Use Le Chateliers Principle to explain what happens as Heat is Removed.,Heat may be treated as a reactant(for an,endothermic,reaction)or as a product(for an,exothermic,reaction).,If you remove heat from an exothermic reaction the equilibrium will change to produce more product.,If you add heat to an exothermic reaction(raise its temperature),the reverse will happen,and you will get less product in the equilibrium mixture.,12.What effect does a Catalyst have on the Equilibrium Composition?,No effect.,Equilibrium is just reached more quickly.,