A chemical change is different from a physical change because in a chemical change ___. A. the appearance changes B. the composition changes C. the size changes D. the weight changes 相关知识点: 试题来源: 解析 B。化学变化与物理变化不同在于化学变化中物质的组成发生了变化。反馈 ...
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...
Is distilling whisky a physical or chemical change? Explain. Why would a fractionating column be more efficient than a simple column at separating compounds that have boiling points that are less than 50 degrees Celsius apart? Explore our homework questions and answers...
There are two kinds of changes — chemical change and physical change. In a chemical change there is always a new substance( 物质 ) formed. Breaking up water into hydrogen( 氢气 ) and oxygen(
or very hot periods and to keep up tiring activity for a long time.Animals such as lizards(蜥蜴)rely on moving in and out of the warm sunlight to regulate their body temperature.They slow down when they can't warm up and may die if they can't get away from heat.They also tend to...
百度试题 结果1 题目When iron rusts, it is a: A. Physical change B. Chemical change C. Both physical and chemical change D. None of the above 相关知识点: 试题来源: 解析 B。铁生锈是化学变化,生成了新的物质铁锈。反馈 收藏
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
and local government and locked and love young men an and loves you and low heat and luxury holidays and lye and made me feel more and made no sound and maintenance appli and make him eat ever and make you dizzy di and man and management patter and many else and many other songs and...
Of the 118 elements known to man, many of these are reactionary. They might react to water or to heat. Some can have strong reactions with other elements. Such interactions can change the elements. Answer and Explanation:1 A chemical change refers to a change in the arrangement of atoms an...
goodtimetonap,asthisagrees withaphysicalcircledipinenergy,”Blattnercontinues. “However,nappingtoolateintotheafternoonoreveningmayimpactnighttimesleepqualityand makeithardertofallasleep.” 30分钟能力强化组合练(九) 第34页 34 ( )1.Whyareadultsoftentakingdaytimenappingmoreatriskofhighbloodpressureand strokes?