问题 选择题

工业上制备纯硅反应的热化学方程式如下:

SiCl4(g)+2H2(g)=Si(s)+4HCl(g) △H=+QkJ/mol(Q>0)

某温度、压强下,将一定量反应物通入密闭容器进行上述反应(此条件下为可逆反应),下列叙述正确的是(    )

A.反应过程中,若增大压强能提高SiCl4的转化率

B.若反应开始时SiCl4为1 mol,则达平衡时,吸收热量为Q kJ

C.反应至4 min时,若HCl浓度为0.12 mol/L,则H2的反应速率为0.03 mol/(L·min)

D.反应吸收0.025Q kJ热量时,生成的HCl通入100 mL 1 mol/L的NaOH溶液中恰好反应

答案

答案:D

题目分析:A项:增大压强,化学平衡逆向移动,SiCl4的转化率减小,故错;B项:反应为可逆反应,反应不能进行到底,吸收的能力要小于Q kJ,故错;C项:物质的反应速率之比等于其化学计量数之比,HCl的反应速率为0.03 mol/(L·min),则H2的反应速率为0.015 mol/(L·min),故错。故选D。

点评:本题考查较为综合,涉及反应热的计算、化学反应速率、化学平衡等问题,题目难度中等,注意反应的可逆性。

阅读理解

A daughter’s duty? Adult daughters are often expected to caregiver for older parents. In 2007, Jorjan Sarich and her dad moved from California to Idaho. It was where he wanted to live his rest time.

“I left my occupation, I left my friends; he did the same thing,” said Sarich, who bought a house with her father, George Snyder, in the China Gardens neighborhood of Hailey after his health began to decline. Though a graduate student struggling to finish her dissertation(论文), Sarich chose to be her dad’s full-time caregiver.

“It’s only now, several years later, that I’m realizing how much work it was. It’s the kind of exhaustion(疲惫)that sleep doesn’t cure,” she said.

About 6 million Americans provide care to elderly relatives or friends living outside of nursing homes. Laurel Kennedy, author of “The Daughter Trap” (Thomas Dunne Books, $25.95), says that women bear a disproportionate(不成比例的)share of the burden — about 70 percent of hands-on care giving such as bathing.

“I want to be clear: Women don’t hate this,” Kennedy said. “What they hate is that everyone just assumes they’ll do it.”

Kennedy is calling for a social revolution equal to the rise of affordable child care and day care: Employers should help working caregivers by offering accommodations. Men should step up more often. It’s unfair that women are always chosen to provide care for an elderly family member.

Despite the hard work it took on Sarich — interrupted sleep and the knowledge that his 2009 death was the end game, she would do it again. Since about half a century had gone by, she wasn’t the person he remembered, and he wasn’t the person she remembered either. Caring for her father changed how each saw the other.

小题1: Why did Jorjan Sarich caregiver for her father?

A.It was a very easy job.

B.She had no work to do.

C.It was the social practice.

D.She lived with her father.小题2:What can we infer from the book “The Daughter Trap”?

A.Daughters don’t like care giving.

B.Daughters devote a lot to care giving.

C.Care giving is daughters’ duty.

D.Care giving should be sons’ duty.小题3:What does the underlined phrase “a social revolution” refer to?

A.The child care revolution.

B.The reform in day care.

C.The social development.

D.The change in care giving.小题4:How many years did Jorjan Sarich work as her father’s full-time caregiver?

A.Five years.

B.Only one year.

C.Four years.

D.Two years.小题5:In her care giving, Jorjan Sarich _____.

A.got along well with her father

B.was a little tired of her father

C.changed her father in every way

D.felt it was unfair to do so

单项选择题 A1型题