A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 B。本题考查化学反应中物质的名称。A 选项 products 是产物。B 选项 reactants 是反应物,符合题意。C 选项 catalysts 是催化剂。D 选项 solvents 是溶剂。反馈 收藏 ...
A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 B。解析:在化学反应中,发生反应的物质叫反应物。选项 A 产物是反应后生成的物质;选项 C 催化剂是加速反应但本身不参与反应;选项 D 溶剂是溶解其他物质的液体。反馈...
77 -- 12:29 App 化学反应-7 - Double Replacement Reactions 双取代反应 1020 -- 16:00 App 氧化还原反应 -4- Half Reaction Method 半反应 691 -- 10:32 App 路易斯结构式-3-Resonance Structures共振结构 47 -- 4:57 App IB化学 化学计算系列 Calculating Masses In Reactions 化学反应中的质量...
A. products to reactants. B. reactants to products. C. catalysts to reactants. D. products to catalysts. 相关知识点: 试题来源: 解析 B。解析:在化学反应方程式中,箭头是从反应物指向产物。选项 A 方向错误。选项 C 和 D 催化剂不是反应的主要物质,箭头不指向它们。反馈...
During a chemical reaction, the substances that react are called: A. products. B. reactants. C. catalysts. D. intermediates. 相关知识点: 试题来源: 解析 B。解析:在化学反应中,发生反应的物质叫做反应物。选项 A 产物是反应后生成的物质。选项 C 催化剂是能改变反应速率但自身在反应前后不变的物质...
百度试题 结果1 题目The substances formed in a chemical reaction are called ___. A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 A。化学反应中形成的物质被称为产物。反馈 收藏
Once the first regenerator bed is cooled through the endothermic chemical reaction of the steam and methane, it is heated by hot flue gas, while steam and methane are reacted in the second, now hot, bed thereby cooling it.HISASHI KOBAYASHI...
should put them in a special container for toxic waste C. pour them into the sink directly D. leave them on the E. xperiment table 相关知识点: 试题来源: 解析 B。解析:从实验步骤逻辑来看,对于有毒的实验废弃物不能随意丢弃,A选项随意扔掉是错误的;也不能直接倒入水槽,C选项违反环保和实验安全...
The planet Earth has only a fixed amount of chemical substances. Waste materials are therefore used again and again by different species of living things. This is called recycling. 1.The word"toxic"in Paragraph 1 means_ A. harmful B. harmless C. enormous D. unnecessary 2.Which of the ...
NCERT solutions for CBSE and other state boards is a key requirement for students. Doubtnut helps with homework, doubts and solutions to all the questions. It has helped students get under AIR 100 in NEET & IIT JEE. Get PDF and video solutions of IIT-JEE Mains & Advanced previous year pap...