题干

有以下物质:

①石墨;②铝;③酒精;④氨水;⑤二氧化碳;⑥碳酸氢钠固体;

⑦氢氧化钡溶液;⑧纯醋酸;⑨氧化钠固体;⑩氯化氢气体.

(1)其中能导电的是____ ;属于非电解质的是____ ;属于强电解质的是____ ;属于弱电解质的是____ .

(2)写出物质⑥溶于水的电离方程式: ____ .

(3)写出物质⑥和⑧在水中反应的离子方程式:____ .

(4)将物质⑥配制成溶液,逐滴加入⑦溶液中至沉淀量最大,写出离子方程式:____ .

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答案(点此获取答案解析)

\u2460\u2461\u2463\u2466,\u2462\u2464,\u2465\u2468\u2469,\u2467,NaHCO3=Na++HCO3\ufe63,HCO3\ufe63+CH3COOH=CH3COO\ufe63+H2O+C

同类题5

阅读理解

    The word advertising refers to any kind of public announcement that brings products and services to the attention of people. Throughout history, advertising has been an effective way to promote(促进)the trading and selling of goods. In the Middle Ages, merchants employed "town criers" to read public messages aloud to promote their goods. When printing was invented in the fifteenth century, pages of advertisements(ads)could be printed easily and were either hung in public places or put in books.

    By the end of the seventeenth century, when newspapers were beginning to be read by more people, printed materials became an important way to promote products and services. The London Gazette was the first newspaper to set aside a place just for advertising. This was so successful that by the end of the century several companies started businesses for the purpose of making newspaper ads for merchants.

    Advertising spread quickly throughout the eighteenth century. Ad writers were starting to pay more attention to the design of the ad text. Everything, from clothes to drinks, was promoted with clever methods such as repetition of the firm's name or product, words organized in eyecatching patterns, the use of pretty pictures and expressions easy to remember.

    Near the end of the nineteenth century, companies that were devoted to the production of ads came to be known as "advertising agencies(广告商)."The agencies developed new ways to get people to think of themselves as members of a group. Throughout the twentieth century, advertising agencies promoted consumerism(消费主义)as a way of life, spreading the belief that people could be happy only if they bought the "right" products.