aOrcein is a compound mixture consisting of ∼14 related small molecules23 that has been used as a food coloring since the Middle Ages. 苔红素是使用了作为食用色素从中世纪的一个复合混合物包括的∼14相关的小molecules23。 [translate]
解析 答案: mixture.考查首字母填空,根据句意:空气是混合物,不是气体混合物.mixture是名词"混合物"是可数名词,因为不定冠词a, 所以此处天mixture. 结果一 题目 Air is a ___ (混合物),not a compound of gases. 答案 答案:mixture.考查首字母填空,根据句意:空气是混合物,不是气体混合物.mixture是名词"...
题目In chemistry, a mixture is different from a ___. A. compound B. element C. atom D. molecule 相关知识点: 试题来源: 解析 A。在化学中,混合物不同于化合物,“compound”是化合物,“element”是元素,“atom”是原子,“molecule”是分子。反馈 收藏 ...
一、 写出画线词语的汉语意思。1. Air is a mixture, not a compound of gases.2. I need to buy a new computer monitor.3. The monument was built in memory of George Washington, the first President of the United States. 相关知识点: 试题来源: 解析 1.混合物 2.显示器 3.纪念碑 ...
A compound is sometimes confused with amixture, but the two differ in important ways. In a mixture, substances are combined, but there's nochemical reactionor bonding like that found in compounds. The individual substances in a mixture retain their ownpropertiesand can be separated into their ...
The substance that has a fixed composition is called a _. A. mixture B. solution C. compound D. element 相关知识点: 试题来源: 解析 C。有固定组成的物质叫化合物。选项 A 混合物没有固定组成;选项 B 溶液是混合物;选项 D 元素是单质,不是化合物。反馈 收藏 ...
相关知识点: 试题来源: 解析 B。本题考查基础化学词汇。选项 A“mixture”指混合物;选项 C“element”指元素;选项 D“compound”指化合物。而“reaction”有反应的意思,在化学实验中物质颜色的变化被称为反应,所以选 B。反馈 收藏
Mixtures Definition - A mixture contains two or more elements or compounds that are not chemically combined together. To learn about Homogeneous and Heterogeneous mixtures click here.
百度试题 结果1 题目3. Air is a mixture (mix), not a compound of gases. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
百度试题 结果1 题目3. Air is amixture(mix),not a compound of gases. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏