盐酸倒在碳酸钙粉末上,能使反应的最初速率加快的是A.增加碳酸钙

盐酸倒在碳酸钙粉末上,能使反应的最初速率加快的是

A.增加碳酸钙的用量                    B.盐酸浓度不变,使用量增加一倍

C.盐酸浓度增加一倍,使用量减半      D.盐酸浓度不变,使用量减半

 

答案

C

解析:

 

相关题目

某物体以30 m/s的初速度竖直上抛,不计空气阻力,g取10 m/s2,
某物体以30 m/s的初速度竖直上抛,不计空气阻力,g取10 m/s2,5 s内物体的 (     )    A、路程为65 m                       B、位移大小为25 m
A giraffe (长颈鹿) gets most of the water it needs from leaves and so it can
A giraffe (长颈鹿) gets most of the water it needs from leaves and so it can go for more than a month _____ drinking. A. except   B. through   C. without   D. besides  
填入下面一段文字开头横线上最恰当的一项是 __________________
填入下面一段文字开头横线上最恰当的一项是 ____________________________________________________我们认为这两种说法是从不同角度分析问题,并不矛盾。前者是
历时150年建造成的中西结合、豪华壮观的皇家园林圆明园,
历时150年建造成的中西结合、豪华壮观的皇家园林圆明园,在第二次鸦片战争中被付之一炬。犯下这滔天罪行的是                         
[例] 已知圆满足:①截轴所得弦长为;②被轴分成两段圆弧
[例] 已知圆满足:①截轴所得弦长为;②被轴分成两段圆弧,其弧长的比为;③圆心到直线:的距离为的圆的方程。
下列说法中正确的是(        )                 
下列说法中正确的是(        )                                                                             
. Oil prices have risen by32 percent since the start of the year,_____a record U
. Oil prices have risen by32 percent since the start of the year,_____a record US $57.65 a barrel on April 4.  A. have reached B. reaching  C. to reach D. to be reaching
 - It seems that Mr Wu is standing there.     - It      be him be
 - It seems that Mr Wu is standing there.     - It      be him because he called me from Canada just now. A. mustn’t         B. can’t           C. needn’t 

最新题目