In a reaction where energy is released, the total energy of the products is ___ the total energy of the reactants. A. greater than B. less than C. equal to D. depends on 相关知识点: 试题来源: 解析 B。在释放能量的反应中,产物的总能量小于反应物的总能量。选项 A“greater than”表示...
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...
In a chemical reaction, the reactants are transformed into products. This process often involves a change in ___. A. energy B. color C. shape D. size 相关知识点: 试题来源: 解析 A。解析:化学反应中,反应物转化为产物通常涉及能量的变化。选项 B 颜色可能改变,但不是必然;选项 C 形状和选项...
Active surveillance in community pharmacies: qualitative and quantitative data of adverse reaction case reports. Health Canada; 2009. Von Elm E, Altman DG, Egger M, Pocock SJ, Gøtzsche PC, Vandenbroucke JP. The strengthening the reporting of observational studies in epidemiology (STROBE) ...
alkyl substituents.Note:In such a reaction whenever there is the use of peroxide then the reaction occurs via anti-markovnikov's rule. This is exactly the opposite of that of Markonikoff’s rule. The reactions that occur via anti-markovnikov's rule are called free ...
acannot answer 不能回答 [translate] a考试前我总有点紧张 Before the test I always a little am anxious [translate] aIn this reaction,one of the products is OH ,which is the species of basic character in aqueous solutions 在这反应,其中一个产品是OH,是基本的字符的种类在水溶液 [translate] ...
The analytic sensitivity of this system was assessed to be <5 pg DNA per PCR reaction. The assessment of the accuracy of the real time-PCR assay to correctly identify sex individuals was investigated with 62 pigs including males (n=29) and females (n=33) belonging to different breeds/lines...
Their instability leads to the formation of a bunch of breakdown and reaction products that are very often reactive themselves. Although excessive consumption of cabbage varieties has been thought for long time to have adverse, especially goitrogenic effects, nowadays, epidemiologic studies provide data...
At a dam in Australia the concrete shows a widespread reaction that has caused surface cracking, and possibly a tightening up of gates that control the flow of water through diversion tunnels. The reaction has produced reaction rims to the aggregate, a crystallization of zeolite A-like material ...
From the local market, 270 products of canned food in aqueousmatrix were ana- lyzed for BADGE, BFDGE and their reaction productswith water and hydrochlo- ric acid. With the exception of twoproducts containing some oil, none of them con- tained expoxycompounds. 11 products had to be taken ...