在A+2B→2C的反应中，若32g物质A和足量物质B恰好完全反应，生成5_爱下问搜题

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问题填空题

在A+2B→2C的反应中，若32g物质A和足量物质B恰好完全反应，生成56g物质C，则参加反应的物质B的质量为______．若 A的相对分子质量为32，则B的相对分子质量为______．

答案

此反应中32g物质A和足量物质B恰好完全反应，生成56g物质C，根据质量守恒定律可知，则参加反应的物质B的质量为：56g-32g=24g．

设B的相对分子质量为x，

A+2B→2C

32 2x

32g 24g

32

2x

=

32g

24g

x=12．

故答案为：24g；12．

判断题

小麦春化阶段接受低温反应的器官是萌动种子胚的生长点或绿色幼苗茎的生长点。()

完形填空

Time is very important in our life. However, I had never realized it until I received a beautiful gold watch from my father one day when I was 19 years old. This __1__ always tells me the importance of time in my life.
It was a cold rainy day. My father asked me to go to the __2__ to pick up my uncle and take him home. I should have arrived there __3__ 4:30 p.m. We had a basketball match at school that afternoon __4__ the match was too exciting. When the match was nearly over, I suddenly remembered my uncle and __5__ to the airport. It was too late. He had left the airport and taken a taxi to our house.
I was very worried that my father would be __6__ with me. As soon as I entered the living room, I saw my uncle in the sofa looking very tired. I dared not __7__ my uncle and father. I said hello to them in a very low voice. My father didn’t say __8__. Instead, he asked me to sit next to him. “Peter, did you have a good time today?” He __9__ very disappointed, but his voice was still calm. I felt so sorry and answered in an even __10__ voice. “Yes, Dad, but I’m really sorry about not __11__ my uncle. This will __12__ happen again. I promise.” My father handed me a box with a beautiful gold watch inside. It was a gift my uncle bought for him. He gave it to _13__ and said, “I hope you have learned something important today, and this watch will help you remember the importance of him.”
The watch has been with me for 12 years. I wear it not because of its price, but because of __14__ I learned from it. It tells me to respect __15__ and never be late to do what I have promised to.