结果1 题目 ( A )6. Which of the following is a chemical change(化学变化)? A. Milk turns into yogurt. B. Water drips through stones. C. Water turns into ice. D. Candles turn to wax. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏 ...
【题文】 Carbon is a chemical element which is present in organic compounds that make us organisms, plants as well as fossil. It is a vital component of the greenhouse gas CO2, the highest percentage of the global warming gas in the atmosphere. These Green House Gases (GIIGs) along with...
Question: Which of the following is a chemical change? 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 ...
-Analysis: Burning LPG involves a chemical reaction where LPG reacts with oxygen to produce carbon dioxide and water. New substances are formed as a result of this reaction. -Conclusion: This is achemical change. 3.Heating of an Iron Rod to Red Hot: ...
25. It is implied in the last paragraph that climate change teaching in some schools A. agree to major public demands. B. reflects teachers' personal biases. C. may misrepresent the energy sector. D. can be swayed by external forces. ...
1__ we know, in a chemical change, energy cannot be created, ___.A.Which, nor can it be destroyedB.As, neither it can be destroyedC.As, neither is it able to be destroyedD.What, nor is destroyed 2___ weknow,inachemicalchange,energycannotbecreated, ___.A.Which, nor can ...
百度试题 结果1 题目 Asubstance produced by a living organism which helps a chemical change happen or happen more quickly, without being changed itself, is called an . 相关知识点: 试题来源: 解析 (1)enzyme 反馈 收藏
Rust is an iron oxide, a usually red oxide fomed by the redox reaction of iron and oxygen in the presence of water or air moisture. Rusting of iron is a chemical change.
Chemical Change: Changes in matter may be classified as either physical change. When there are no changes in the chemical composition that occur the change is considered a physical change. When there is an accompanying change in composition...
Which of the following is an example of a chemical change? (a) Water boiling (b) Ice melting (c) Rusting of a nail (d) Alcohol evaporating (e) Iodine vaporizing. Physical and Chemical Changes: All changes...