题干

我国第四套人民币硬币从1999年开始发行,一元币为钢芯镀镍(Ni),伍角币为钢芯镀铜合金,一角币为铝合金或不锈钢。
(1)铸造以上硬币用到的材料都是____(填“合成材料”或“金属材料”)。
(2)选择铸造硬币的材料不需要考虑的因素是____(填序号)。

A.金属的导电性
B.金属的耐腐蚀性
C.金属的硬度D.金属价格与硬币面值的吻合度

(3)以上硬币涉及到Fe、Cu、Al、Ni(镍),已知Ni能够发生如下反应:
Ni+ H2SO4= NiSO4+ H2↑ , Fe+ NiCl2 =Ni + FeCl2
这两个反应的基本类型都是____。四种金属活动性由强到弱的顺序为____(用元素符号表示)。

上一题 下一题 0.0难度 选择题 更新时间:2018-07-03 04:48:22

答案(点此获取答案解析)

金属材料,A,置换反应,Al> Fe > Ni > Cu

同类题2

根据短文理解,选择正确答案。

Marco Polo

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    He set out, aged 17, with his father Nicolo and his uncle Maffeo on their great journey to China. They sailed south from Venice, Italy and stopped off in the Middle East. They ofen carried on overland to Persia (now Iran), through the Pamir Mountains and the Gobi Desert before they got to Beijing, China.At that time, China was more advanced than Europe. They already had paper, so large numbers of books were available. They also used paper money in many parts of the country.

    After he got back to Italy, Marco Polo talked about his experiences in China, and he wrote a book describing the riches of Asia. His book was the first western record of porcelain(瓷器), coal, gunpowder, printing and silk.Unfortunately, not many people believed Polo's stories and he became known as “the man of a million lies”. He died in 1324.

Jacques Cousteau

    Jacques Cousteau was a French undersea explorer, environmentalist and inventor. He was born in France in 1910. When he was young, he was attracted by the sea, machines and filmmaking. In the French navy, Cousteau began exploring underwater and worked on a special breathing machine which allowed divers to stay underwater for several hours. This gave them time to really look around under the ocean. In 1948, Cousteau began travelling the world's oceans in his research ship Calypso.Cousteau produced many films and books about his underwater experiences, including the TV series The Underwater World of Jacques Cousteau, which introduced the public to the world of sharks, whales, dolphins and treasure.

    Cousteau started the Cousteau Society to protect ocean life. In 1989, he received a great honour: he was made a member of the French Academy. Finally, after a long and varied life, Cousteau died on 25th June, 1997.