The term 'catalyst' is used to describe a substance that ___ in a chemical reaction. A. increases the rate B. decreases the rate C. changes the products D. is consumed completely 相关知识点: 试题来源: 解析 A。催化剂(catalyst)的作用是提高化学反应的速率,而自身在反应前后质量和化学性质不...
In a chemical reaction, we need to find a catalyst. Which of the following is often used as a catalyst? A. Platinum B. Gold C. Silver D. Copper 相关知识点: 试题来源: 解析 A。解析:Gold(黄金)、Silver(白银)、Copper(铜)虽然都是金属,但它们在一般情况下不作为常见的催化剂。Platinum(铂)...
If a catalyst is added to a chemical reaction, which of the following is most likely to occur? A. The activation energy will increase. B. The reaction time will be prolonged. C. The reaction rate will remain the same. D. The reaction rate will increase. ...
In an experiment to study the effect of a catalyst on a chemical reaction rate, if the reaction rate with the catalyst seems to be no different from that without the catalyst, which of the following might be the cause? A. The catalyst was not in its active form, for example, it needed...
A. raise B. lower C. double D. affect 相关知识点: 试题来源: 解析 D。本题考查词汇及对催化剂作用的理解。raise 通常用于“提升,提高(数量、水平等)”。lower 表示“降低”,催化剂不是单纯地提高或降低反应速率。double 意思是“加倍”,过于绝对,催化剂的作用不一定是使速率加倍。affect 表示“影响”,...
19 A catalyst increases the rate of a chemical reaction by (1)(1)providing an alternate reaction pathway(2)providing the required heat of reaction(3) increasing the potential energy of the products(4) increasing the activation energy of the reaction 相关知识点: 试题来源: 解析 (1) 反馈...
A catalyst accelerates a reaction without being consumed, focusing on chemical processes; a cause is an event or condition that directly facilitates an effect, applicable broadly in various contexts.
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]...
platinum black- a fine black powder of platinum; used as a catalyst in chemical reactions anticatalyst- (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst 2.catalyst- something that causes an important event to happen; "the invasion acted as a cat...
platinum black- a fine black powder of platinum; used as a catalyst in chemical reactions anticatalyst- (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst 2.catalyst- something that causes an important event to happen; "the invasion acted as a cat...