将一定量的镁和铝分别与足量的盐酸反应，若放出氢气的质量相等，_爱下问搜题

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问题选择题

将一定量的镁和铝分别与足量的盐酸反应，若放出氢气的质量相等，则参加反应的镁和铝的物质的量之比为（　　）

A．1：1

B．2：3

C．3：2

D．8：9

答案

设镁和铝分别与足量的盐酸反应都生成1mol的H₂，则

Mg+2HCl=MgCl₂+H₂↑，

1 1

2Al+6HCl=2AlCl₃+3H₂↑

2 3

2

3

1

所以参加反应的镁和铝的物质的量之比=1：

2

3

=3：2．

故选C．

单项选择题

对远点的描述，正确的是（）

A、眼作最大调节所能看清物体的最近距离

B、眼作最大调节所能看清物体的最远距离

C、远点近移，看远物清楚，看近物不正常

C、远点不随年龄的增长而改变

E、远点近移可配戴凸透镜进行矫正

填空题

Blair Admits Never Having Sent Flowers to His Wife

British Prime Minister Tony Blair admitted on a television programme that he has never sent flowers to his wife Cherie and that he had a youthful crush on Hollywood beauty Grace Kelly.
Blair, who allowed Channel 4 interviewer June Sarpong to shadow him for two days last month, made other personal (1) when asked questions he rarely hears on the usual television political (2) .
During the interviews for a program targeting 18-30 year (3) , the prime minister admitted he sometimes has to "wing it" when (4) public appearances and that he yearns to go out for a drink (5) being recognised.
However, the most dramatic revelation was his reply to Sarpong’s (6) on whether he still sends his wife flowers, prompting his interviewer to (7) in disbelief. "I’ve never sent her flowers. If I sent her flowers, she would (8) worried," Blair said.
But he added: "I am romantic. There are other ways of (9) romantic."
Blair needed a few moments to recall which posters he had (10) his bedroom wall as a youngster, then revealed: "I’ll tell you... actually, (11) I was younger, I loved Grace Kelly."
Born in 1929, Kelly (12) in films like ’Dial M For Murder’, ’Rear Window’ and ’High Society’ in the mid-1950s, but (13) acting to marry Prince Rainier of Monaco in 1956, when Blair was (14) two years old.
Blair admitted he initially found it "odd" to be (15) minister and to be rushed in motorcades from appointment to (16) , and worried that his lifesty left him "a bit isolated" from (17) people.
He admitted that he was constantly on the phone between public (18) , and rarely had time to prepare for his next (19) , telling Sarpong: "I wing it all the time."
And he revealed he has to check himself before he replies to (20) questions from the public. "The worst thing is when someone is giving you a real earful and you think ’I’m going to say something I will regret’," he said.
Asked what he would do if he could be invisible for a day, Blair yearned for a more ordinary life, saying he would "just walk down the street and go to the pub... just be absolutely normal".