问题
选择题
将少量的高锰酸钾溶解在水里，形成的溶液用来消毒．该消毒液是（ ）
A．纯净物
B．化合物
C．单质
D．混合物
答案
高锰酸钾溶液中含有高锰酸钾和水，属于混合物．
故选D．
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将少量的高锰酸钾溶解在水里，形成的溶液用来消毒．该消毒液是（ ）
A．纯净物
B．化合物
C．单质
D．混合物
高锰酸钾溶液中含有高锰酸钾和水，属于混合物．
故选D．
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| Thomas Edison was a famous American scientist. He was l in 1847. When he was a child, he liked to 2 out how things worked. He was in school 3 only three months. He asked his teacher a lot of strange questions. Most of them had nothing 4 his lessons. The teacher thought the boy was not bright. So Edison's mother took her son 5 of school. As his mother had been a teacher, she taught Edison 6 .The boy read a 7 .Soon he became very 8 in science. At the age of ten, Edison had already 9 a chemistry lab for himself. When he grew into a young man, he 10 many important things for man. All these things have changed the whole world. Can you name some of his inventions? | ||||
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