问题 问答题

甲同学对盐的有关知识进行了以下的整理,请你帮助甲同学回答下列问题:

(1)填写下表空格中的化学式:

氯化钙氯化钠氯化镁氯化铝氯化锌氯化亚铁
CaCl2NaClMgCl2______ZnCl2______
①以上盐中的金属元素的排列,可以得出是依据______顺序归纳整理的.

②根据酸溶液、碱溶液各自具有相似化学性质的原因,分析上述盐溶液______(填具有或不具有)相似的化学性质,理由是______.

(2)写出一个有氯化镁生成的化学方程式:______;属于______反应.

答案

(1)根据物质的名称 氯化铝化学式为:AlCl3;氯化亚铁的化学式为:FeCl2

①根据金属活动性表的知识可知:表中盐中的金属元素的排列,是依据金属活动性 顺序归纳整理的;

故答案为:金属活动性;

②根据表中物质在溶液中解离出的阴离子都是Cl-;因此它们有相似的化学性质;

故答案为:具有;这些物质在溶液中解离出的阴离子都是Cl-

(2)有氯化镁生成的化学方程式如镁与盐酸反应,属于置换反应;

2HCl+Mg=MgCl2+H2↑;属于置换反应;

故答案为:2HCl+Mg=MgCl2+H2↑;属于置换反应.

单项选择题
单项选择题

Sadness isn’t manly—this Eric Weaver knew. When depression engulfed this New York police sergeant, it took a different guise: a near-constant state of anger. "One minute I’d be okay and the next minute I’d be screaming at my kids and punching the wall," he recalls. "My kids would ask, ’What’s wrong with Daddy Why’s he so mad all the time’" For years, Weaver didn’t know what was wrong.

Weaver’s confusion about what tortured him was not unusual. Roughly a third of the 18 million or more Americans who suffer depression each year are men. Yet all too often, experts say, men fail to recognize the symptoms and get the treatment they need.

For years, experts suspected that gender makes a big difference in depression. Studies from New York to New Zealand have repeatedly found the same startling statistic: About twice as many women as men suffer from depression. That finding was considered one of the bedrock facts of modern mental health. Yet it has recently come under attack from critics who are concerned about underreporting of male depression.

William Pollack, Director of the Center for Men at McLean Hospital, is leading the charge against the well-entrenched depression gender gap. He argues that men’s rate of depression may be nearly equal to women’s. Just look at suicide rates, he says: Male suicides outnumber females four to one. That ratio "is way too high to say that men’s depression numbers are so low," he notes.

Pollack and others contend that male depression goes unrecognized because, unlike the female version, it often doesn’t fit the textbook signs—at least in the early stages. Clinical depression at later stages looks much the same in both sexes. But in the prelude to a breakdown, that deepening despair is often expressed in very different ways. Instead of being weepy, men are more apt to be irritable and angry—moods that aren’t included in the classic diagnostic tests. "Their sadness and helplessness are hidden behind a mask of anger," says Pollack.

"Men tend to act out" to avoid dealing with uncomfortable feelings, adds Fredric Rabinowitz, a psychologist who works primarily with men. If they feel bad, they’re apt to get into fights on the job or at home, withdraw from family and friends, become obsessed with work or hobbies. Most significantly, men often turn to drinking or drugs. Men have two to four times the rate of substance abuse problems as women, and Pollack contends that if this was recognized as a sign of depression, the gender gap would substantially narrow.

Studies from New York to New Zealand suggested that()

A. women’ mental health was worse than men’s

B. men are 50% less depressed than women

C. different gender faces different depressions

D. gender differences explained the depression rates