问题 填空题

W、X、Y、Z是原子序数依次增大的同一短同期元素,W、X是金属元素,Y、Z是非金属元素.

(1)W、X各自的最高价氧化物对应的水化物之间可以反应生盐和水,该反应的离子方程式为______.

(2)W与Y可形成化合物W2Y,该化合物的电子式为______.

(3)W、X、Y、Z四种元素简单离子的离子半径由大到小的顺序是(用离子符号表示):

______>______>______>______.

(4)Z的最高价氧化物与水反应得到一种稀溶液,写出该反应的离子方程式______.

答案

(1)氢氧化铝是两性氢氧化物,能和强碱反应生成盐和水,二者反应的离子方程式:

Al(OH)3+OH-=AlO2-+2H2O,故答案为:Al(OH)3+OH-=AlO2-+2H2O;

(2)Na2S为离子化合物,电子式为:

,故答案为:

(3)核外电子数一样,核内质子数越多,半径越小,故:Na+>Al3+,S2->Cl-,电子层越多半径越大,则有S2->Cl->Na+>Al3+,故答案为:S2->Cl->Na+>Al3+

(4)Cl2O7与水混合得到HClO4:Cl2O7+H2O=2HClO4,故答案为:Cl2O7+H2O=2H++2ClO4-

阅读理解

“Good morning!” said a woman as she walked up to an old man sitting on the ground. The man slowly looked up. He was Jack, who had been begging around here for a couple of years.

“See that cafeteria(自助餐厅)over there?” she asked. “I’m going to get you something to eat and get you out of the cold for a while.”

She sat down at the table across from her amazed dinner guest. She stared at him intently. “Jack, do you remember me?” Old Jack thought hard and said, “I think so--I mean you do look familiar.”

“I was thin and hungry,” she said. “Maybe I’ve filled out now more than when you worked here. That was when I was just out of college. I had come to the city looking for a job, but I couldn’t find anything. Finally I was down to my last few cents and had been kicked out of my apartment. I walked in the streets for days, cold and hungry. I saw this place and walked in hoping that I could satisfy my hunger.”

Jack lit up with a smile. “Now I remember,” he said. “I was behind the serving counter. You came up and asked me if you could work for something to eat. I said it was against company’s policy.”

The woman continued, “Then you made me the biggest roast beef sandwich, gave me a cup of coffee, and told me to go over to a corner table and enjoy it. I was afraid that you would get into trouble. Then, I saw you put the price of my food in the cash register.”

“So you started your own business?” old Jack said. “I got a job that very afternoon. I worked my way up. Eventually I started my own business that, with the help of God, prospered.” She opened her purse and pulled out a business card. “When you are finished here, I want you to pay a visit to a Mr. Lyons, the personnel director of my company. He’ll find something for you to do around the office.” She smiled, “If you ever need anything, my door is always open to you.”

There were tears in the old man’s eyes, “How can I ever thank you?” he said. “Don’t thank me;” the woman answered, “thank yourself. It was your kindness that let me know you.”

小题1:Why did the woman invite the beggar to dinner?

A.The beggar was once her friend.

B.She felt very pity for the beggar.

C.The beggar once offered her a free meal.

D.She once worked with the beggar.小题2:What does the underlined phrase “fill out” in Paragraph 4 probably mean?

A.wear a beautiful dress.

B.change one’s features.

C.have a very high position.

D.become larger or fatter.小题3:Years ago the woman walked into the place she caught sight of to __________.

A.find a job there

B.get herself out of cold

C.get something to eat

D.meet with the man小题4:What conclusion can you draw from this passage?

A.Kindness is an investment that never fails.

B.Nothing is difficult for the man who will try.

C.Don’t judge a person from his/her appearance.

D.God helps those who help themselves.

问答题 简答题