A. Feels slippery B. Turns litmus paper red C. Does not react with acids D. Has a sour taste 相关知识点: 试题来源: 解析 A。本题考查碱的性质。碱摸起来滑滑的,A 正确;碱能使石蕊试纸变蓝,不是变红,B 错误;碱能和酸反应,C 错误;碱尝起来是涩的,不是酸的,D 错误。反馈...
The substance that turns litmus paper red is ___. A. acid B. base C. neutral solution D. salt solution 相关知识点: 试题来源: 解析 A。能使石蕊试纸变红的物质是酸。选项 B 是碱;选项 C 是中性溶液;选项 D 是盐溶液。只有酸能使石蕊变红。反馈...
The substance that turns litmus paper red is___. A. an acid B. a base C. water D. salt 相关知识点: 试题来源: 解析 A。能使石蕊试纸变红的是酸。选项 B 碱使石蕊试纸变蓝;选项 C 水一般不会使石蕊试纸变色;选项 D 盐通常也不会使石蕊试纸变红。反馈...
A. acid B. base C. salt D. water 相关知识点: 试题来源: 解析 B。原因:“For example, litmus paper can turn from red to blue in the presence of a base and from blue to red in the presence of an acid.”。 反馈 收藏
Bases turn red litmus paper blue, have a bitter taste, and have a pH of greater than 7. Compare acid. 2. Mathematics a. The side or face of a geometric figure to which an altitude is or is thought to be drawn. The base can be, but is not always, the bottom part of the ...
indicator- (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction litmus,litmus test- a coloring material (obtained from lichens) that turns...
1. C 答案来自于本句:British scientist Robert Boyle discovered the use of litmus paper over 300 years ago,属于对细节的理解,选C,其它几项未说到。2. A 此题属于推理题,要联系上下文才能找到答案。从下文They went to collect over 40 plants in parks, gardens and markets可知是一种植物plant,故选A...
谈到人生追求，我们经常会吟诵“独上高楼，望尽天涯路”，“蜀道难，难于上青天”，“路漫漫其修远兮”，它们分别是：（）。 谈到人生追求，我们经常会吟诵“独上高楼，望尽天涯路”，“蜀道难，难于上青天”，“路漫漫其修远兮”，它们分别是：（）。
Indicators are substances that change color depending on the pH of the solution. For example, litmus paper turns red in acidic solutions and blue in basic solutions. When an acid is neutralized by a base, the litmus paper will change from red to blue or vice versa, depending on the ...
Litmus paper, or red and blue test strips, will tell you whether a solution is an acid or a base, but it won't give you information about the strength of the solution. Universal, or alkacid, indicator paper has a different color to match every number on the pH scale. Neutral solutions...