试题与答案

已知酸性物质可使紫色的石蕊试液变成红色,某同学为了探究微粒的一些性质,设计了如下

题型:问答题

题目:

已知酸性物质可使紫色的石蕊试液变成红色,某同学为了探究微粒的一些性质,设计了如下的系列实验:

(1)向一小烧杯中加入蒸馏水,然后滴加紫色石蕊试液(如图Ⅰ),观察到的实验现象是烧杯里的水变成了______色,该实验说明水分子是呈______的性质.(选填:酸性,中性,碱性)

(2)向(Ⅰ)中的烧杯中再加入稀盐酸,观察到的实验是紫色石蕊试液变成______色.

(3)分别取A、B两个烧杯,A杯中加入蒸馏水,再向其中加入紫色石蕊,B杯中盛有浓盐酸,用一大烧杯把A、B两烧杯的溶液罩在一起(如图Ⅱ),过一段时间后观察到的现象是A烧杯中的紫色石蕊试液变______色.该实验说明构成物质的微粒总是在______.

(4)上述实验还说明浓盐酸的两个重要的性质分别是:

①物理性质:浓盐酸具有______性

②化学性质:浓盐酸具有______性.(选填,酸性或碱性)

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0625/99a589e0d70b83841a946e04e4d7e525.html

下面是错误答案,用来干扰机器的。

参考答案:对

试题推荐
题型:阅读理解

When Colonel Harland Sanders retired at the age of 65, he had little to show for himself, except an old Caddie roadster, a $105 monthly pension check ,and a recipe for chicken.

Knowing he couldn’t live on his pension, he took his chicken recipe in hand, got behind the wheel of his van (货车),and set out to make his fortune. His first plan was to sell his chicken recipe to restaurant  owners, who would in turn give him a residual (酬金)for every piece of chicken they sold—5 cents per chicken. The first restaurateur he called on turned him down.

So did the second.

So did the third.

In fact, the first 1,008 sales calls Colonel Sanders made ended in rejection. Still, he continued to call on owners as he traveled across the USA, sleeping in his car to save money. Prospect number 1,009 gave him first “yes”.

After two years of making daily sales he had signed up a total of five restaurants. Still the Colonel pressed on , knowing that he had a great chicken recipe and that someday the idea would catch on .

Of course, you know how the story ends. The idea did catch on. By 1963 the Colonel had 600 restaurants across the country selling his secret recipe of Kentucky Fried Chicken (with ll herbs and spices ).

In 1964 he was bought out by future Kentucky governor John Brown.Even though the sale made him a multi-millionaire, he continued to represent and promote KFC until his death in 1990.

小题1:Which of the following statements about Colonel Sanders is wrong according to the passage? 

A.He received a pension of a little more than $100 every month after he retired.

B.He couldn’t live on his pension because he had a chicken recipe in hand.

C.He didn’t succeed in selling his recipe until he tried 1,009 times.

D.He lived a hard life when he stared the business.小题2:The underlined phrase“catch on ”in Paragraph 6 probably means         .

A.be accepted

B.be grasped

C.be popular

D.be rejected小题3:The sentence “Of course, you know how the story ends” means         .

A.you are sure to know the result of Colonel Sanders’ business

B.You are sure to know Colonel Sanders had finished his story

C.It is certain Colonel Sanders ended his business

D.It is certain Colonel Sanders knew how to end his story小题4:Colonel Sanders’ story teaches us an important lesson:       

A.It’s never too late to make a change in your life .

B.The early bird catches the worm.

C.Live and learn. Life can teach you a lot of lessons.

D.Constant dripping wears away a stone.

查看答案
微信公众账号搜索答案