In a chemical reaction, if the temperature is increased, the reaction rate usually ___. A. decreases B. increases C. remains constant D. becomes unpredictable 相关知识点: 试题来源: 解析 B。温度升高,化学反应速率通常会增加。A 选项“decreases”表示降低,错误;C 选项“remains constant”表示保持...
The rate of the chemical reaction ___ by temperature. A. is affected B. affects C. are affected D. affect 相关知识点: 试题来源: 解析 A。本题考查被动语态。“rate”是单数,且“被温度影响”要用被动语态,被动语态的构成是“be + 过去分词”,所以是“is affected”。反馈 收藏 ...
When a chemical reaction is carried out at a higher temperature, the reaction rate increases mainly because ___. A. the activation energy is reduced B. the number of reactant molecules increases C. the collision frequency of reactant molecules increases D. the concentration of reactants increas...
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...
As a rule of thumb, a rise in temperature of 10 °C doubles the reaction rate. Why might increasing the temperature alter the rate of a chemical reaction? If you're thinking it's because the molecules involved are moving more quickly when the temperature is higher, you're on the right ...
句子 The rate of any chemical reaction, regardless of the temperature at which it takes place, usually depends on a very important characteristic known as its activation energy. 问题 句子分析(俗称“长难句分析”)是训练提高基础阅读能力的有效手段。我们通过对托福(TOEFL)、雅思(IELTS)、GRE、考研以及...
First order reaction, temperature and reaction rate constant? «on:December 16, 2007, 09:41:49 AM » Hi everyone! I'm having trouble with this one: At 55 degrees Celsius, a substance degrades by 75,2% in 10 minutes. This is a first-order reaction. What is the reaction rate consta...
Part 2 of the question, does the amount of water affect the rate of reaction over time. I understand there must be a saturation point in which the water may not take any more of the powder in. So does this rate of reaction slow down as more of the tablet is being introduced to the...
She has taught science at the high school and college levels. Most reaction rates are temperature-dependent. In general, the higher the temperature, the faster the rate of the reaction. The reaction rate can be determined by the Arrhenius equation. Arrhenius equation: k = Ae(-Ea/RT)We ...
J., 1987, Temperature dependence of the rate constant for the reaction HS+NO 2 , J. Phys. Chem. 91 , 5743–5749.Temperature dependence of the rate constant for the reaction OH+H2S in He, N2 and O2. Lin Y L,Wang N S,Lee Y P. International Journal of Chemical Kinetics . 1985...