(1)B (2)C (3)A (1) 根据第二段最后一句话“A change is not a chemical change if it doesn’t form a new substance.”可得出答案。 (2)根据第四段的陈述以及最后一句话“So the dissolving of anything is a physical change.”可得出答案。 (3)从文章最后一段可以得出正确答案。反馈...
Chemical Change and Physical Change 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 ...
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(
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<p>To answer the question about the main characteristics of a chemical change, we can break it down into three key points:</p><p>1. <strong>Irreversibility</strong>: - One of the main characteristics of a chemical change is that it is generally irrev
百度试题 结果1 题目4 When a chemical change(一个化学变化)takes place, one or more substances are formed. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
(柳树)are the best-known of these trees. When insects begin biting a willow, the tree sends out a special smell a once. This smell tells the other willows that dangerous insects are coming near. All of them quickly make a chemical in their leaves. This chemical is bad for the insects....
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 chemical ...
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 change is not a chemical change if it doesn’t form a new substance...
"I' ve been able to keep firm friendships with them. Thus I have been allowed to gain access to their living environment. I don't see it as a lawless land. But rather see it as an area of freedom." 30). What is Gin ’ s attitude toward s the lives of the indigenous Guianese...