问题
填空题
电解水的实验中,正极得到______气,负极得到______气,正负两极气体的体积比是______,由该实验得出的结论是______.
答案
水通电可以分解出氢气和氧气,正极产生氧气、负极产生氢气,二者气体体积之比为1:2;组成氢气的氢元素、氧气的氧元素都来自水,所以水是由氢、氧两种元素组成的;
故答案为:氧;氢;1:2;水是由氢、氧两种元素组成的;
电解水的实验中,正极得到______气,负极得到______气,正负两极气体的体积比是______,由该实验得出的结论是______.
水通电可以分解出氢气和氧气,正极产生氧气、负极产生氢气,二者气体体积之比为1:2;组成氢气的氢元素、氧气的氧元素都来自水,所以水是由氢、氧两种元素组成的;
故答案为:氧;氢;1:2;水是由氢、氧两种元素组成的;
根据短文内容,用方框中所给词的适当形式填空。
Dear Han Mei, Thank you for your letter. I 小题1: China very much. And I 小题2: to go to China with my parents. We want 小题3:Beijing. I know something 小题4:China from your letters. 小题5: I don’t know much about Chinese food. Could you tell 小题6:something about it? I like 小题7: and fish very much. You tell me you 小题8:eat rice, vegetables and chicken. And your 小题9: food is jioazi. What kind of food 小题10: drink can I have in China? Please tell me. |