Scientists watch the changes of a chemical reaction. This is ___. A. experiment B. observation C. interview D. survey 相关知识点: 试题来源: 解析 B。观察化学反应的变化是观察法。选项 A 实验法会有变量控制等操作;选项 C 采访法不适用;选项 D 调查法不适用。反馈...
A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 A。解析:化学反应中生成的物质叫产物。选项 B 反应物是发生反应的物质;选项 C 催化剂是加速反应但本身不参与反应;选项 D 溶剂是溶解其他物质的液体。反馈 收藏
Which of the followings are factors that affect the rate of a chemical reaction( )。A.the catalyst of the reactionB.the concentration of the reactantsC.the temperature of the systemD.the concentration of the products的答案是什么.用刷刷题APP,拍照搜索答
Fire is a chemical reaction involving ___. A、heat B、fuel C、air D、all the above 点击查看答案进入小程序搜题 你可能喜欢 对于abstract类,不能创建该类的对象。() A.正确B.错误 点击查看答案进入小程序搜题 喷射状呕吐提示可能有: A. 幽门梗阻 B. 颅内压增高 C. 食物中毒 D. 胃潴留 E...
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During a chemical reaction, the substances that react are called: A. products. B. reactants. C. catalysts. D. intermediates. 相关知识点: 试题来源: 解析 B。解析:在化学反应中,发生反应的物质叫做反应物。选项 A 产物是反应后生成的物质。选项 C 催化剂是能改变反应速率但自身在反应前后不变的物质...
1.6Which ONE of the following statements about a chemical reaction is CORRECT?The actual yield of a chemical reaction is usually ...C A equal to the percentage yield. B greater than the percentage yield. C less than the theoretical yield. D greater than the theoretical yield. 相关知识点:...
The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the...
The heat of a chemical reaction at constant pressure is not a state function.A.正确B.错误的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,以提高学习效率,是学习的生产力
For a chemical reaction, what will change as the reaction proceeds ( )A.The equilibrium constant becomes smallB.The reaction rate decreasesC.The activation energy decreasesD.The rate constant becomes small的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shua