Which of the following is a chemical reaction? A. Melting ice B. Breaking a glass C. Rusting of iron D. Folding a piece of paper 相关知识点: 试题来源: 解析 C。本题主要考查化学变化的定义。A 选项冰融化是物理变化,物质的状态改变但没有新物质生成。B 选项打破玻璃也是物理变化,只是物质...
Which of the following is a chemical reaction? A. Melting ice B. Breaking a glass C. Rusting of iron D. Folding a paper 相关知识点: 试题来源: 解析 C。本题考查化学反应的定义。A 选项冰融化是物理变化,物质的状态发生改变但没有新物质生成。B 选项打破玻璃也是物理变化,只是物质的形状发生改变...
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In chemical reaction , the catalyst : 01:35 Which statements is not correct ? 02:04 In the adsorption of oxalic acid on activated charcoal, the activated ... 02:06 Which can absorb large volume of hydrogen gas ? 02:27 In which of the following processes, platinum is used as a catalyst...
This type of engineering is for you if: You’re interested in understanding how engineering is applied within different types of business, and the challenges involved in both technical and organizational terms. You want to quickly take on a managerial role, while also applying your technical knowle...
12. Which statement describes a catalyst? A a substance that decreases the rate of a chemical reaction and is not changed by the reaction B a substance that decreases the rate of a chemical reaction and is changed by the reaction C a substance that increases the rate of a chemical reaction...
A. Oxidation reaction B. Reduction reaction C. Displacement reaction D. Double - displacement reaction 相关知识点: 试题来源: 解析 A。解析:食物变质过程中,常常发生氧化反应,例如食物中的油脂被氧化等。选项B还原反应不符合食物变质的主要化学原理。选项C置换反应与食物变质的常见反应类型不符。选项D复分解反...
The correct Answer is:A To determine in which reaction halide is not obtained, we will analyze the provided reactions involving alcohols (ROH) with different reagents. 1. Identify the Reactions: We have four reactions involving alcohols (ROH) and different reagents: - Reaction 1: ROH + Na -...
Which process is not a part of the purification of metals? a. distillation b. electrolysis c. zone refining d. chemical reduction Metallurgy: Metallurgy is the practice of obtaining metals. It is done by sequential steps from their ores and ...
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