The substance that speeds up a chemical reaction without being consumed itself is a ___. A. product B. reactant C. catalyst D. solvent 相关知识点: 试题来源: 解析 C。catalyst 是催化剂,能加快化学反应速度但自身不被消耗;product 是产物;reactant 是反应物;solvent 是溶剂。所以选催化剂。反馈...
The substance that can speed up a chemical reaction without being consumed is called ___. A. reactant B. product C. catalyst D. solvent 相关知识点: 试题来源: 解析 C。解析:能加快化学反应速率而自身在反应前后不发生变化的物质叫做催化剂(catalyst)。反应物是(reactant),产物是(product),溶剂是(...
What is the name of the substance that changes the rate of a chemical reaction without being consumed? A. Reactant B. Product C. Catalyst D. Solute 相关知识点: 试题来源: 解析 C。这里考查“catalyst”(催化剂)的概念,它能改变反应速率但自身不被消耗。选项 A“reactant”是反应物;选项 B“...
If there are 8 grams of substance H, how many grams of substance G are there? A. 4 grams B. 8 grams C. 16 grams D. 32 grams 相关知识点: 试题来源: 解析 C。G 的量是 H 的两倍,H 有 8 克,所以 G 有 16 克。反馈 收藏
解析 C。本题主要考查摩尔的概念。摩尔是物质的量的单位,1 摩尔物质含有阿伏伽德罗常数个微粒。选项 A 克是质量单位;选项 B 升是体积单位;选项 C 微粒,1 摩尔物质含有阿伏伽德罗常数个微粒,所以与摩尔有对应关系;选项 D 千克是质量单位。反馈 收藏
apeople come from 正在翻译,请等待...[translate] aMenneking 开始[translate] aa catalyst is a substance that increases the rate of a chemical reaction without itself being used up 催化剂是增加一个化学反应的率,不用用完的本身的物质[translate]...
a对...起到重要作用 To….Plays the vital role[translate] aa substance that increases the rate of a chemical reaction without being permanently changed consumed is called 增加一个化学反应的率,不用永久被改变被消耗的物质叫[translate]
In a certain chemical reaction, the amount of a substance increases by a factor of 4 every 5 minutes. If the initial amount was 10 grams, how much will there be after 15 minutes? A. 160 B. 640 C. 40 D. 1600 相关知识点:
In or-\nder to signal the start of the reaction, a fluorescent tagging sub-\nstance is included with at least the last antigen or antibody reac-\ntion component introduced into the reaction zone. The fluorescent\ntagging substance does not enter into the antigen-antibody reaction\nand is ...
material,stuff- the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread" reactant- a chemical substance that is present at the start of a chemical reaction ...