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(...
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
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“...
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
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 a chemical experiment, the measured value of a substance was higher than the actual value. Which of the following could be the reason? A. The measuring instrument was not calibrated properly. B. The reaction was not completed. C. The sample was contaminated. D. The E. xperimenter made...
PROBLEM TO BE SOLVED: To solve the problem that it is necessary to cut off the conventional catalyst body to a suitable size appropriate to dispose it in a reaction flow path because of a plate-like shape, and that the volumetric efficiency is poor.櫻井 誠...
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]
cal properties of materials are important in engineering. Many chemical reactions take place in the kitchen. When biscuits are made with use of sour milk and baking soda there is a chemical reaction between the baking soda and a substance in the sour milk,lactic acid,to produce the gas carbon...