下列化学方程式书写正确的是( ) A.CO2+CaCl2+H2O=CaCO3↓+2HClB.NH4HCO

下列化学方程式书写正确的是(  )

 

A

CO2+CaCl2+H2O=CaCO3↓+2HCl

B

NH4HCO3+HCl=NH4Cl+CO2↑+H2O

 

C

FeSO4+Cu=CuSO4+Fe

D

Fe+2HNO3=FeNO32+H2

答案

分析:

根据化学方程式判断正误的方法需考虑:应用的原理是否正确;化学式书写是否正确;是否配平;反应条件是否正确;的标注是否正确.

解答:

解:A、二氧化碳与水反应生成碳酸,碳酸酸性较弱,不能与氯化钙溶液发生反应,故化学方程式书写错误.

B、该化学方程式书写完全正确.

C、铜的金属活动性比铁弱,不能与硫酸亚铁溶液发生置换反应,故该化学方程式错误.

D、浓硝酸具有强氧化性,能与金属发生反应,但在常温下Fe遇浓硝酸发生钝化,使反应不再反应,故该化学方程式错误.

故选B

 

相关题目

Our eating habits are very important for good health and a strong body. There ar
Our eating habits are very important for good health and a strong body. There are times when most of us would rather eat sweets and ice-cream than meat and rice. Sweets and ice-cream are not bad if we
Chairman Mao once said,“It is not hard to do one good deed. It is hard to do g
Chairman Mao once said,“It is not hard to do one good deed. It is hard to do good deeds all your life.” Guo Mingyi, a 52-year-old worker in Anshan, Liaoning did just that. Over the past 20 years,
下列关于英法两国政体叙述错误的是 A.英国的国家元首是国
下列关于英法两国政体叙述错误的是 A.英国的国家元首是国王 法国国家元首是总统 B.英国政府首脑是首相 法国政府首脑是总理 C.英国政府首脑是首相
1916年,孙中山先生曾对“宁波帮”企业家作过高度评价:“
1916年,孙中山先生曾对“宁波帮”企业家作过高度评价:“凡吾国各埠,莫不有甬人事业,即欧洲各国,亦多甬商足迹,其能力之大,固可首屈一指者
There is an endless supply of stories about sleepwalkers (梦游者).Peopl
There is an endless supply of stories about sleepwalkers (梦游者).People have been said to climb on roofs, solve mathematical problems, write music, walk through windows, and do murder in the
. 如图,图中正方形ABCD的边长为4,则图中阴影部分的面积为
. 如图,图中正方形ABCD的边长为4,则图中阴影部分的面积为    (    ) 第7题图  (A) 16-4∏  (B)32-8∏ (C)8∏-16 (D)无法确定 
在数轴上将表示-2的点沿数轴移动3个单位长度,得到的点所
在数轴上将表示-2的点沿数轴移动3个单位长度,得到的点所表示的数是_______
-- Good morning. Can I help you?      --- I’d like to have this package __
-- Good morning. Can I help you?      --- I’d like to have this package ________, sir.     A. weighed                         B. to be weighed C. to weigh      

最新题目