问题 选择题

美国普度大学研究开发出一种利用铝镓合金制备氢气的新工艺(工业流程如下所示)。下列有关该工艺的说法错误的是

A.该过程能量转化的形式只有两种

B.铝镓合金可以循环使用

C.铝镓合金与水的反应属于置换反应

D.总反应式为:2H2O = 2H2↑+ O2

答案

答案:A

铝镓合金与水发生反应后,铝把水分解,带走氧气释放出氢气。铝镓合金与水的反应的化学方程式为,氧化铝电解又生成铝和氧气,所以总反应式为2H2O = 2H2↑+ O2↑,因此选项BCD都正确。根据过程可判断,反应中会有热量释放出来,所以能量的转化不止2种,A不正确。答案选A。

选择题
单项选择题

Phyllis Wheatley is regarded as America’’s first black poet. She was born in Senegal, Africa, about 1753 and brought to America aboard a slave ship at about the age of seven. John and Susannah Wheatley bought her for three pounds at a slave auction in Boston in 1761 to be a personal servant of Mrs. Wheatley. The family had three other slaves, and all were treated with respect. Phyllis was soon accepted as one of the family, which included being raised and educated with the Wheatley’’s twin 15-year-old children, Mary and Nathaniel. At that time, most females, even from better families, could not read and write, but Mary was probably one of the best educated young women in Boston. Mary wanted to become a teacher, and in fact, it was Mary who decided to take charge of Phyllis’’s education. Phyllis soon displayed her remarkable talents. At the age of twelve she was reading the Greek and Latin classics and passages from the Bible. And eventually, Mrs. Wheatley decided Phyllis should become a Christian.At the age of thirteen Phyllis wrote her first poem. She became a Boston sensation after she wrote a poem on the death of the evangelical preacher George Whitfield in 1770. It became common practice in Boston to have "Mrs. Wheatley’’s Phyllis" read poetry in polite society. Mary married in 1771, and Phyllis later moved to the country because of poor health, as a teacher and caretaker to a farmer’’s three children. Mary had tried to interest publishers in Phyllis’’s poems but once they heard she was a Negro they weren’’t interested.Then in 1773 Phyllis went with Nathaniel, who was now a businessman, to London. It was thought that a sea voyage might improve her health. Thirty-nine of her poems were published in London as Poems on Various Subjects, Religious and Moral. It was the first book published by a black American. In 1775 Phyllis wrote a poem extolling the accomplishments of George Washington and sent it to him. He responded by praising her talents and inviting her to visit his headquarters. After both of her benefactors died in 1777, and Mary died in 1778, Phyllis was freed as a slave. She married in 1778, moved away from Boston, and had three children. But after the unhappy marriage, she moved back to Boston, and died in poverty at the age of thirty.

Which of the following conclusions about Phyllis is supported by the passage

A.She would have been more recognized as a poet if she had not been black.

B.She would have written poetry if she had stayed in Africa.

C.She went unrecognized as a poet during her lifetime.

D.She only wrote religious poetry.