问题 填空题

在温度T1和T2下,X2(g)和 H2反应生成HX的平衡常数如下表:

(1)仅依据K的变化,可以推断出:随着卤素原子核电荷数的增加,_______(选填字母)

a. 在相同条件下,X2的平衡转化率逐渐降低

b. X2与H2反应的剧烈程度逐渐减弱

c. HX的稳定性逐渐减弱

d. HX的还原性逐渐

(2)在容积为3L的密闭容器中,由I2(g)和H2(g)合成HI(g),在其他条件不变的情况下,研究温度对反应的影响,HI的物质的量的变化情况如下图所示。

①温度为T1时,在0~tAmin内,H2的消耗速率v (H2)=__________

②分析上图所示图像,下列说法正确的是________(填序号)

a.温度为T2,容器内气体密度不变时,反应到达B点所示状态

b.平衡状态从A点移动到B点,n(HI)/n(H2)增大

c.该反应为放热反应

(3)加水稀释0.1mol·L-1的HF溶液,下列各量中增大的是________(填序号)

a. c(H+)

b. Ka(HF)

c. c(F-)/c(H+)

d. c(H+) / c(HF)

(4)在0.1mol·L-1HCl溶液中加入过量AgNO3溶液,产生白色沉淀,再滴加KI溶液,出现黄色沉淀,试写出有关的离子方程式____________ 、_____________ 。

答案

(1)ac

(2)2nA/3tA mol·L-1·min-1; c

(3)d

(4)Ag++Cl-==AgCl↓ ;AgCl(s)+I-(aq)=AgI(s)+Cl-(aq)

判断题
单项选择题

When something goes wrong, it can be very satisfying to say," Well, it’s so-and-so’s fault. "or "I know I’m late, but it’s not my fault ; the car broke down. "It is probably not your fault, but once you form the habit of blaming somebody or something else for a bad situation, you are a loser. You have no power and could do nothing that helps change the situation. However, you can have great power over what happens to you if you stop focusing on whom to blame and start focusing on how to remedy the situation. This is the winner’s key to success.

Winners are great at overcoming problems. For example, if you were late because your car broke down, maybe you need to have your car examined more regularly. Or, you might start to carry along with you the useful phone numbers, so you could call for help when in need. For another ex-ample, if your colleague causes you problems on the job for lack of responsibility or ability, find ways of dealing with his irresponsibility or inability rather than simply blame the person. Ask to work with a different person, or don’t rely on the person. You should accept that the person. Ask to work with a different person, or don’t rely on this person. You should accept that the person is not reliable and find creative ways to work successfully regardless of how your colleague fails to do his job well.

This is what being a winner is all about—creatively using your skills and talents so that you are successful no matter what happens. Winners don’t have fewer problems in their lives ; they have just as many difficult situations to face as anybody else. They are just better at seeing those problems as challenges and opportunities to develop their own talents. So, stop focusing on "whose fault it is". Once you are confident about your power over bad situations, problems are just stepping stones for success.

When problems occur, winners take them as()

A. excuses for their failures

B. barriers to greater power

C. challenges to their colleagues

D. chances for self-development