解析 C。解析:化学变化是产生新物质的变化。A 改变物质颜色可能是物理变化,如颜料混合。B 冰融化是物理变化,状态改变。C 燃烧木材产生新物质,是化学变化。D 压扁易拉罐是物理变化,形状改变。本题考查对化学变化概念的理解,涉及词汇有 chemical change(化学变化)、substance(物质)等。
A. Wax turns into water B. Wax combines with oxygen to form carbon dioxide and water C. Wax turns into hydrogen gas D. Wax turns into oxygen gas 相关知识点: 试题来源: 解析 B。解析:蜡烛燃烧时,蜡与氧气发生化学反应,生成二氧化碳和水,这是蜡烛燃烧这个化学变化的本质。选项A蜡不会单纯地变成水...
Solsona, NuriaIzquierdo, MerceSolsona, N. What is conserved in a chemical change? Opinions of secondary school pupils. in Proceedings of the Third International Seminar on Misconceptions and Educational Strategies in Science and Mathematics. 1993. Ithaca, New York: Cornell University....
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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...
B. No chemical reaction occurs. C. A new substance is formed. D. The mass of iron decreases. 相关知识点: 试题来源: 解析 C。铁生锈是化学变化,在这个过程中会形成新物质。A 选项颜色会改变,错误;B 选项有化学反应发生,错误;D 选项铁生锈质量会增加,错误。反馈 收藏 ...
Name the process by which water vapors change into liquid water. Which is the phase change in which a substance changes from a gas to liquid? When you boil water, what takes place during the boiling process? A. The pressure of the escaping vapor is greater than the air pressure. B. Th...
What happens when magnesium oxide is dissolved in water ? Write a word... 02:02 Which one of the following is not a chemical change ? 02:35 Which of the following are physical changes? (i) Melting of iron met... 01:21 Which of the following are chemical changes? (i) Decaying of ...
Is responsible to coordinate decorates between the company and the neighborhood relations, assists the second party to complete work and so on scene security, fire prevention, garbage disposal.[translate] aIt is hard to explain what a chemical change is 解释是坚硬的什么化学变化是[translate]...
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