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。
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]...
A. Wax turns into water B. Wax combines with oxygen to form carbon dioxide and water C. Wax turns into hydrogen gas D. Wax turns into oxygen gas 相关知识点: 试题来源: 解析 B。解析:蜡烛燃烧时,蜡与氧气发生化学反应,生成二氧化碳和水,这是蜡烛燃烧这个化学变化的本质。选项A蜡不会单纯地变成水...
Is responsible to coordinate decorates between the company and the neighborhood relations, assists the second party to complete work and so on scene security, fire prevention, garbage disposal. [translate] aIt is hard to explain what a chemical change is 解释是坚硬的什么化学变化是 [translate] ...
English Definition chemistry; chemical Simplified Script 化学 Traditional Script 化學 Pinyin huàxué Effective Pinyin (After Tone Sandhi) Same Zhuyin (Bopomofo) ㄏㄨㄚˋ ㄒㄩㄝˊ Cantonese (Jyutping) faa3hok6 Part of Speech (名) noun Topical Word Lists Part of school/subjects Proficiency Test ...
百度试题 结果1 题目What is the difference between a chemical reaction and a physical change?相关知识点: 试题来源: 解析 Chemical changes produce new substances,not a physical change 反馈 收藏
What are the characteristics of a physical change in chemistry? What is a physical reaction in chemistry? What substance speeds up a chemical reaction? What are the key characteristics of a chemical reaction? Are chemical elements formed via chemical reactions?
whoisamagazineeditorandDorothyWoodruff?s granddaughter. Whydidtheygothen? Well,theywantedto dosomethinguseful.Soon,however,theyrealizedwhattheyhadundertaken. Theymovedinwithalocalfamily,theHarrisons,and,likethem,hadlittleprivacy,rare baths,andablanketofsnowontheirquiltwhen theywokeupinthe morning.Some mornin...
Solsona, NuriaIzquierdo, MerceSolsona, N. What is conserved in a chemical change? Opinions of secondary school pupils. in Proceedings of the Third International Seminar on Misconceptions and Educational Strategies in Science and Mathematics. 1993. Ithaca, New York: Cornell University....
eating habits, because much of the food they eat, particularly processed foods, is not good for health. Consequently,there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers widely used in farming ...