问题 填空题

(1)同浓度的下列溶液:①NH4Al(SO42②NH4Cl③CH3COONH4,其中c(NH4+)由大到小的顺序是______(填序号,下同).

(2)同浓度的下列溶液:①(NH42SO4②NH4Cl③Na2CO3④NaHCO3,其中PH由大到小的顺序是______.

答案

(1)铝离子抑制铵根离子水解,醋酸根离子促进铵根离子水解,铵根离子水解程度越大,则相同浓度的铵盐溶液中铵根离子浓度越小,所以相同浓度的这三种盐,c(NH4+)由大到小的顺序是①②③,

故答案为:①②③;

(2)硫酸铵和氯化铵为强酸弱碱盐,其溶液呈酸性,相同浓度的硫酸铵和氯化铵溶液中,硫酸铵水解程度小于氯化铵,但硫酸铵中铵根离子水解个数多,所以硫酸铵pH最小;

碳酸氢钠和碳酸钠溶液都呈碱性,但碳酸根离子水解程度大于碳酸氢根离子,所以相同浓度的碳酸钠和碳酸氢钠,碳酸钠的pH最大,则相同浓度的这四种溶液中,pH由大到小的顺序是③④②①;

故答案为:③④②①;

阅读理解

Charlie Boswell has always been a great hero. He has inspired thousands of people to rise above circumstances and live out true meaning of life.

He was blinded during World War II while rescuing his friend from a tank that was under fire. He was a great athlete before the accident. In order to prove his talent and determination, he decided to try a brand new sport, a sport he never imagined playing, even with his eyesight – golf! Through determination and a deep love for the game he became the National Blind Golf Champion! He won that honor 13 times.

One of his heroes was the great golfer Ben Hogan, so it truly was an honor for Charlie to win the Ben Hogan Award in 1958.

Upon meeting Ben Hogan, Charlie was respectful and stated that he had one wish and it was to have one round of golf with the great Ben Hogan. Mr. Hogan agreed that playing a round together would be an honor for him as well, as he had heard about all of Charlie’s accomplishments and truly admired his skills.

“Would you like to play for money, Mr. Hogan?” asked out Charlie.

“I can’t play you for money, it wouldn’t be fair!” said Mr. Hogan.

“Aw, come on Mr. Hogan…$ 1,000 per hole!”

“I can’t, what would people think of me, taking advantage of you and your circumstance?” replied the sighted golfer.

“Chicken, Mr. Hogan?”

“Okay,” replied the embarrassed Hogan, “but I am going to play my best!”

“I wouldn’t expect anything else,” said the confident Boswell.

“Now that you’re on. Mr. Boswell, you name the time and the place!”

The very self – assured Boswell responded, “10 o’clock … tonight!”

小题1:Why didn’t Mr. Hogan want to play Charlie for money?

A.He was worried he would lose the match.

B.He thought it was unfair for Charlie.

C.He didn’t care about money.

D.He preferred chicken to money.小题2:According to the text, what does the underlined word “self - assured” probably mean?

A.ignorant

B.selfless

C.confident

D.sincere小题3:It can be inferred from the text that         .

A.Mr. Hogan was not good at playing golf

B.Charlie did well in other sports before playing golf

C.Mr. Hogan didn’t try his best to play

D.Charlie Boswell was born blind小题4:What would be the result of the match?

A.Charlie won.

B.Hogan won.

C.Neither of them won.

D.Not mentioned.小题5:Which of the following can best describe Charlie?

A.Competitive and generous

B.Energetic and reliable

C.Careful and considerate

D.Confident and smart

名词解释