【简答题】A.She thinks big parties are too impersonal. B.She would like to invite friends to a big party. C.She feels she has to spend a lot of money in holding big parties. D.She would like to be invited to sm...
【单选题】若反应 在某温度下的标准平衡常数为 2 ,那么在该温度下氨合成反应 的 标准平衡常数是( )
【单选题】某可逆反应aA+bB cC+Q在某温度下的平衡常数为K(K≠1),反应热为Q。保持温度不变,将方程式的书写作如下改变,则Q和K数值的相应变化为
A.
写成2aA+2bB 2cC,Q值、K值均扩大了一倍
B.
写成2aA+2bB 2cC,Q值扩大了一倍,K值保持不变
C.
写成cC aA+bB,Q值、K值变为原来的相反数
D.
写成cC aA+bB,Q值变为原来的相反数,K值变为倒数
【单选题】已知: ,某温度下的平衡常数为400。此温度下,在1 L的密闭容器中加人CH 3 OH,反应到某时刻测得各组分的物质的量浓度如下: 下列说法正确的是
B.
平衡时,c(CH 3 OCH 3 )='1.6' mol/L
C.
平衡吋,反应混合物的总能量减少20kJ D 平衡时,再加人与起始等量的CH 3 OH,达新平衡后CH 3 OH转化率增大
【简答题】A.She thinks big parties are too impersonal. B.She would like to invite friends to a big party. C.She feels she has to spend a lot of money in holding big parties. D.She would like to be invited to sm...
【判断题】Jo thinks that Bill must be mad because he is driving too fast.