一定温度下,在容积固定的密闭容器中发生可逆反应A(g)+2B(g)   2Q(g)

一定温度下,在容积固定的密闭容器中发生可逆反应A(g)+2B(g)   2Q(g)。平衡时,各物质的浓度比为c(A):c(B):c(Q)=1:1:2,保持温度不变,以1:1:2的体积比再充入ABQ,则下列叙述中正确的是(  )

A.刚充入时反应速率υ()减小,υ()增大   

B.达到新的平衡过程中,体系压强先增大,后逐渐减小  

C.达到新的平衡时c(A):c(B):c(Q)仍为1:1:2  

D.达到新的平衡时,反应混合物中AB的体积分数增加

答案

【答案】B

【解析】略

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