1 Researchers have established that when people are mentally,bio-chemical changes occur in the brain请问这个句子中brain后的that属于句子的那个成分,还有其后的指代词it 指代的是什么,这个句子该怎么分析成分Researchers have established that when people are mentally engaged,bio-chemical changes occur in the ...
Physical and Chemical Changes Essay Changes in matter occur every day. There are two types of ways matter can be altered; physically and chemically. Physical changes do not change the composition of the matter while chemical changes occur when one or more substances turn into a completely new su...
However, these simulations do not address long-term recovery from a release or the scenario where a natural disaster or a negligent act by the government or a third party causes the chemical release. Hazardou...
Hi folks I open a spreadsheet, leave it open for a while and later want to close it. Sometimes I make changes to it and sometimes I don't. I've got the...
The π bond on the double bond is not as strong as the sigma bond. Therefore, the π bond is easier to break and undergo various chemical changes when chemical reactions occur.答案: 正确 点击查看答案解析 手机看题 你可能感兴趣的试题 单项选择题 直流电动机的额定功率指( )。 A.转轴上吸收的...
When does soil pollution occur? Pollution Pollution involves the introduction of contaminants within the environment resulting in drastic changes. There are various forms of pollution, such as noise pollution, air pollution, and soil pollution. The causes of these pollutions include; industrialization and...
When a substance changes state, then two things can occur. These are: Addition of energy. Removal of energy. This addition and removal of energy have...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer...
resulting in new materials as the products of the chemical reaction. Chemical reactions can occur spontaneously or require an outside trigger such as an input of energy. Breaking chemical bonds absorbs energy, while making new bonds releases energy, with the overall chemical reaction being endothermic...
Attosecond lasers—an attosecond is a billionth of a billionth of a second—have been around for about a decade and are used by scientists to probe very fast reactions. Since most chemical reactions occur rapidly, these fast-pulse lasers are key to "seeing" how the electrons that form the ...