A. decreasing the temperature B. increasing the concentration of reactants C. removing the catalyst D. decreasing the pressure 相关知识点: 试题来源: 解析 B。本题考查影响化学反应速率的因素。A 选项降低温度会减慢化学反应速率。B 选项增加反应物浓度可以加快化学反应速率,符合题意。C 选项移除催化剂会...
A. lowering the temperature. B. decreasing the concentration of reactants. C. adding a catalyst. D. reducing the pressure. 相关知识点: 试题来源: 解析 C。解析:添加催化剂可以提高化学反应的速率。选项 A 降低温度通常会使反应速率减慢。选项 B 降低反应物浓度也会使反应速率减慢。选项 D 降低压力对...
百度试题 结果1 题目The rate of a chemical reaction depends ___ many factors. A. on B. in C. at D. for 相关知识点: 试题来源: 解析 A。depend on 是固定搭配,表示“取决于”。反馈 收藏
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”,...
In a research on how temperature affects the rate of a chemical reaction, if we increase the temperature by 10 degrees each time, what should we keep constant? A. The amount of reactants B. The shape of the container C. The color of the reactants D. The person who conducts the E....
A. lowering the temperature B. decreasing the concentration of reactants C. adding a catalyst D. increasing the volume of the reaction vessel 相关知识点: 试题来源: 解析 C。本题考查影响化学反应速率的因素。添加催化剂可以降低反应的活化能,从而加快化学反应速率。降低温度会使反应速率减慢;减小反应物...
Which of the followings are factors that affect the rate of a chemical reaction( )。 A. the concentration of the reactants B. the temperature of the system C. the catalyst of the reaction D. the concentration of the products 相关知识点: 试题来源: 解析 A,B,C 反馈 收藏 ...
In an experiment to test the effect of temperature on the rate of a chemical reaction, the temperature is the ___. A. independent variable B. dependent variable C. control variable D. constant variable 相关知识点: 试题来源: 解析 A。在测试温度对化学反应速率影响的实验中,温度是自变量。选项...
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“...
A. The rate of a chemical reaction. B. The amount of reactants at equilibrium. C. The extent of a chemical reaction at equilibrium. D. The pressure of a reaction. 相关知识点: 试题来源: 解析 C。解析:平衡常数 K 是衡量化学反应在平衡状态下进行程度的量。A 选项是反应速率;B 选项是平衡...