2022英语周报八年级第五期。答案

16.(…)(1)415.1(2分)CO(g)+H2O(g)=CO2(g)+H2(g)△H2=-41.4kJ·mol(2分)(二)(2N(g)+3H(g)2NH2(g)△H=~92k·mol-1[或nN2(g)+H2(g)NH3(g)△H46kJ·mo!-](2分)(3)254kJ·mol-(1分)(三)(4)<(1分)放热(1分)(5)<(1分)二(1分)【解析】(一)(1)根据△H1=反应物键能一生成物键能来计算a.△H1=4ak·mol+2×465kJ·mol1一(1076k·mol-2+3×436k·mol-n)=+206.4k·mol-,解得a=415.1kJ·mol¨;因为无CO2中C=0键的键能数据,根据盖斯定律计算可知,△Ⅰ2=ΔH一ΔH:=+1650kJ·mo-1-206.4kJ·mol=-41.4kl·mol-,反应‖的热化学方程式是CO(g)+H2O(g)CO2(g)+H2(g)△H2=-41.4kJ·mol-l。(二)(2)根据△H=反应物键能一生成物键能,△H=946kJ·mol-1+436kJ·mol-×3-391kJ·mol1×6=92kJ·mo-,热化学方程式为N2(g)+3H2(g)2NH3(g)△H=-92kJ·mol(3)△H=正反应活化能一逆反应活化能则-46kJ·ml=E。-600k·ml-1÷2E,=25kJ·ml-'。(三)(4)根据图像可知,两步反应均为放热反应△H<0。(5)根据图像可知,总反应的化学反应速率由活化能高、速率慢的第二步决定。

第三节One possible version:Children are widely exposed to alcohol and thus have amisunderstanding of it very early. However, without realizing the problem, parents don' t pay enough attention to it.Unluckily, according to research, teenage drinking is veryserious in North Dakota, which might result in variousproblems. Since children and teenagers tend to ask theirparents for guidance in making decisions, it s parentsuty to communicate with children about alcohol in time.

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