问题
填空题
下图是同学们根据所学知识设计的一个趣味实验，请参与实验并回答问题：将分液漏斗里适量的水加人大试管中，使足够量的氢氧化钠固体完全溶解后，能观察到的现是 _________ ；产生上述现象的主要原因是 _________ ．
答案
U型管中，a端水位下降，b端水位上升；氢氧化钠固体溶于水，放热，使试管内的气压升高
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下图是同学们根据所学知识设计的一个趣味实验，请参与实验并回答问题：将分液漏斗里适量的水加人大试管中，使足够量的氢氧化钠固体完全溶解后，能观察到的现是 _________ ；产生上述现象的主要原因是 _________ ．
U型管中，a端水位下降，b端水位上升；氢氧化钠固体溶于水，放热，使试管内的气压升高
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| On a cold November afternoon, my mother and I were walking home from a pizza store. We were dressed warmly and 1 with the rented(租)video we had been dying for watch. I was feeling a little 2 , as I was carrying our shopping bags of snacks and the 3 .They were so heavy that I decided to 4 some things. So I started to walk towards the garbage can 5 I noticed a poor man walking his bike out of the restaurant in front of us. He 6 a paper bag with his dirty hand. He headed over to another nearby garbage can and started 7 it. I suddenly felt very 8 because I was about to do away with a new drink just 9 it was heavy. I knew this man would take all he could 10 , so I walked up to him and 11 the drink and some snacks to him. The man looked up 12 and took what I gave him. A huge smile spread 13 his face and this caused me to feel indescribable 14 . I felt like I 15 be happier with myself, but then he said, "This is my son's lucky day!" With that, he 16 me happily and started off on his bike. I even heard him 17 a song as he rode away. I got a warm feeling inside and I knew I had done something good, for the man and his family. I now understand what is 18 by the saying "Giving is getting". Since then, every time I have the 19 to do something nice, the image of the man's happiness caused by my small gift appears in my mind. This is the 20 of charity. | ||||
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