When we heat water, it starts to boil. This is a ___ change. A. chemical B. physical C. natural D. artificial 相关知识点: 试题来源: 解析 B。“chemical”指化学变化;“physical”指物理变化,水加热沸腾是物理变化;“natural”意为“自然的”;“artificial”意为“人工的”。所以选 B。 反馈 ...
The boiling of water is a(n) ___. A. chemical reaction B. physical change C. electrical reaction D. biological change 相关知识点: 试题来源: 解析 B。解析:水沸腾是物理变化,只是状态改变,没有新物质生成。选项 A 化学反应会有新物质生成,不符合。选项 C 电反应与题目无关。选项 D 生物变化不符...
When water is boiled in a pot, it bubbles. Has a chemical reaction occurred? Explain your answer.Chemical and Physical Changes:Substance may undergo a change in form or a change in identity. Through chemical reactions which involve the making and breaking of chemi...
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( 氧气 ) is a chemical change. In each of the chemical change at least one new substance is for...
___a chemical change a new kind of substance is formedA.In the case ofB.In caseC.In case ofD.In of的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,以提高学习效率,是
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...
百度试题 结果1 题目___ is a chemical change. (burn) 相关知识点: 试题来源: 解析反馈 收藏
A) Melting Iron B) Boiling alcohol C) Evaporating Water D) Burning Coal Changes in Matter: Changes in matter can be classified as either physical or chemical change. Physical changes are those that do not involve changes in the chemical composition o...
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: A chemical change refers to a change in the arrangement of atoms and, ultimately, structure and characteristics of an element. When elements...
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(氧气) is a chemical change. In each of the chemical change at least one new substance is formed. A ch...