2014中考名师推荐化学金刚石、石墨和碳60

适用年级:初三
试卷号:272209

试卷类型:专题练习
试卷考试时间:2014/4/29

1.单选题(共5题)

1.
下列过程中发生了化学变化的是
A.石墨导电B.金刚石切割金属
C.用铅笔写字D.用焦炭冶炼
2.
为了增加汽车轮胎的耐磨性,常在制轮胎的橡胶中加入的耐磨物质是
A.石墨粉B.活性炭C.木炭粉D.炭黑
3.
下列各组物质接触时,不反应的是
A.灼热的焦炭和二氧化碳气体
B.常温下的木炭和水
C.高温下的木炭粉和氧化铜
D.灼热的碳和空气
4.
用墨书写或绘制的字画年深日久不变色,这是因为碳在常温下具有
A.稳定性B.可燃性C.还原性D.氧化性
5.
当CuO中混有少量碳粉时,可以用下列哪种方法提纯
A.隔绝空气加热混合物B.在氧气流中加热混合物
C.加足量水搅拌过滤D.用筛子将碳粉筛去

2.选择题(共2题)

6.阅读下面短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词,每个空格里只填一个单词。

    The Internet nowadays opens a wide world to people, including teenagers, but many parents worry that their children may meet with something unhealthy when searching online. In order to solve this problem, a new search engine for children called Kiddle has appeared.

    Search results are filtered(过滤),so only safe website are shown and descriptions are written in simple language. Searches with bad words are shut off, too.

    Kiddles uses the same colors as Google in its logo and a similar design on its homepage, too—with an extra robot picture.

    The top three Kiddle search results show safe websites and pages written specially for kids, and those websites and pages are well chosen and checked by Kiddle developers.

    The fourth to seventh results will be safe and trusted websites that are not written specially for kids, but have content written in a simple way. These results are also chosen and checked.

    Results on the eighth and owwards pages are safe and famous websites that are written for adults. They provide expert content, but are harder for kids to understand.

    Unlike on Google, most results appear along with large thumbnail pictures(缩略图)to make it easier for children to find what they are looking for. For example, when searching for "meow meow". Google produces pages for information about a drug(毒品)that has "meow meow" as its nickname(绰号),but Kiddle lists information only about cats, even with some cartoon pictures.

    The company explained, "Websites which appear in Kiddle search results satisfy family-friendly requirements, as we filter websites with unhealthy content."

Kiddle—a Child-Friendly Search Engine

Characteristics

 Only safe websites are shown.

 Descriptions are written in simple language.

{#blank#}1{#/blank#} bad words appear.

Logo

It uses the same colors as Google with a robot picture.

Content

The top three search results

Websites and pages are written {#blank#}2{#/blank#} for kids, after being well chosen and checked.

The fourth to seventh results

Websites are also worth {#blank#}3{#/blank#} and have content written in a simple way.

The eighth and onwards results

Websites are safe and famous, written for adults, and they are not {#blank#}4{#/blank#} for kids to understand.

{#blank#}5{#/blank#} from Google

 Kiddle has many thumbnail pictures.

 Kiddle only gives safe information.

Advantage

Kiddle satisfies family-friendly requirements.

7.根据所给中文完成句子

3.填空题(共1题)

8.
同一种元素可以组成不同种单质.碳单质有     等,其中   是天然存在的最硬的物质,    是最软的矿物之一,它们的性质差异是因为它们的   ,由此可知 决定物质的性质。
试卷分析
  • 【1】题量占比

    单选题:(5道)

    选择题:(2道)

    填空题:(1道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:2

    7星难题:0

    8星难题:2

    9星难题:2