(5分)在密闭容器里,通入x mol H2(g)和y mol I2(g),发生反应:H2(g)+

(5分)在密闭容器里,通入x mol H2(g)和y mol I2(g),发生反应:

H2(g)+I2(g)  2HI(g)  △H <0。改变下列条件,反应速率将如何改变?(选填“增大”“减小”或“不变”)

(1)升高温度                ; 

(2)加入催化剂             

(3)充入更多的H2            ; 

(4)扩大容器的体积              

(5)保持容器容积不变,通入氖气               

 

答案

(1)增大,(2)增大,(3)增大,(4)减小(5)不变

解析:注意审题:该题考查外界条件对反应速率的影响;

(4)扩大容器的体积,则各组分浓度均减小,故反应速率减小;

(5)压强增大,但容积不变,则各组分浓度不变,故对反应速率无影响

 

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