解析 C。解析:化学变化是产生新物质的变化。A 改变物质颜色可能是物理变化,如颜料混合。B 冰融化是物理变化,状态改变。C 燃烧木材产生新物质,是化学变化。D 压扁易拉罐是物理变化,形状改变。本题考查对化学变化概念的理解,涉及词汇有 chemical change(化学变化)、substance(物质)等。
百度试题 结果1 题目 47. I am afraid B . A. what is a chemical change B. that I have missed the chance C. how is he recently D. why he was late for the meeting 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
asimile 相似 [translate] athose set forth below 下面被指出的那些 [translate] aspained spained [translate] aThe best title for this passage is 19th-Century Family . 正在翻译,请等待... [translate] aIt is hard to explain what is a chemical change 解释是坚硬的什么是化学变化 [translate] ...
What, if Anything, is a Chemical Engineer?The core domains of Chemical Engineering are in crisis as corresponds to a mature discipline that has been going on for more than 100 years. However, over the last two decades, some concerns have been raised about the identity and future of Chemical...
First, I show the concept of a chemical property can survive the abandoning of the metaphysical framework of substance. While this abandonment means that we will need to give up essential properties, contingent properties can give us all the stability we need to account for chemical continuity as...
A. Try to clean it up by yourself. B. Run away from the laboratory. C. Alert the laboratory technician. D. Continue with your E. xperiment. 相关知识点: 试题来源: 解析 C。如果有化学物质泄漏,应首先提醒实验室技术员。选项 A 自己清理可能会很危险;选项 B 逃离实验室不是最佳选择;选项 D 继...
What can a chemical reaction be represented by? A. A picture. B. A story. C. A chemical equation. D. A song. 相关知识点: 试题来源: 解析 C。原因:文中提到 A chemical reaction can be represented by a chemical equation.反馈 收藏 ...
A chemical change refers to a change in the arrangement of atoms and, ultimately, structure and characteristics of an element. When elements undergo...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
问一题英文选择题It is hard to explain in words ___.A What is a chemical change B what a chemical change is C how is a chemical change D how a chemical change is 为什么,选B,我想请大家给我分析一下,首先我想知道,为什么
A chemical property is a characteristic or behavior of a substance that may be observed when it undergoes achemical changeor reaction. Chemical properties are seen either during orfollowing a reactionsince the arrangement of atoms within a sample must be disrupted for the property to be investigated...