A。解析:在化学实验中,我们经常仔细地注意溶液的颜色变化。notice有注意到、察觉到的意思,强调有意识地去关注。find是找到,侧重于结果。recognize是认出,通常是对已经知道的事物再次识别。discover是发现新事物,这里不是发现新的颜色,而是关注颜色变化,所以notice最合适。反馈...
Whenever a chemical change ___, there is a new substance formed.[ ]A.takes place B.takes a place C.takes the place D.took place相关知识点: 试题来源: 解析 答案:A 提示: 该题考查短语动词和时态.take place表示“发生”是一短语动词,该句用来说明一物理现象,应用一般现在时态,由主句的一般现在...
A. In the case of B. In case C. In case of D. In event of 相关知识点: 试题来源: 解析 A in case of sth.:假使,如果;in case:以防,万一;in event of:如果,以防;三项都不符合题意。in the cause of意为“在,,过程中”。句意:在化学变化中一种新物质生成了。反馈 收藏 ...
36.Every chemical change either results from energy being used to produce the change,or causes energy to be in some form. A.given off B.put out C.set off D.used up6. Every chemical change either results from energy being used to produce the change, or causes energy to be_in some for...
___a chemical change a new kind of smaterial is formed.( )A. In the case ofB. In caseC. In case ofD.In event of 相关知识点: 试题来源: 解析 考查介词短语.in the case of:至于…,在……的情况下,就…来说,就……而言;in case 万一,以防;in case of防备; 假如;in event of...
There are two kinds of changes—chemical change and physical change. In a chemical change, there is always a new substance formed. Breaking up water into hydrogen and oxygen is a chemical change. In each of the chemical change at least one new substance is formed. A change is not a chemi...
百度试题 结果1 题目A chemical change always involves a change in the ___ of matter. A. state B. properties C. quantity D. location 相关知识点: 试题来源: 解析 B。化学变化总是涉及物质性质的变化。反馈 收藏
Every chemical change either results from energy being used to produce the change, or causes the energy to () in some form. A. give off B. put out C. set off D. use up 答案 A 每一个化学变化要么是由于其他能量产生变化引起,要么是引起某种形式的能量释放。 give off意为“释放出(光、能等...
takes over接管;takes place发生;takes after像;takes off起飞。根据“The chemical change…in paper when it burns”以及常识可知燃烧时会发生化学变化。故选B。结果一 题目 The chemical change in paper when it burns.A.takes overB.takes placeC.takes afterD.takes off 答案 暂无 结果二 题目 9.(2021...
Every chemical change either results from energy being sued to produce the change, or causes energy to be ___ in some form. A. given off B. put out C. set off D. used up∠ACB=90° C. D 相关知识点: 试题来源: 1997年...