In a chemical reaction, the substances that react are called ___. A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 B。本题考查化学反应中物质的名称。A 选项 products 是产物。B 选项 reactants 是反应物,符合题意。C 选项 catalysts 是催化剂。D 选项 solvents 是...
A. happened B. participated C. involved D. included 相关知识点: 试题来源: 解析 C。根据题意,我们需要找一个动词来表示“参与”的意思。在四个选项中,C 选项的 involved 恰好符合此要求,因此选择 C 选项。 首先,阅读题目,了解题目的背景信息。根据题目中的信息,我们知道这是一个化学反应,并且有两种以上...
17.1 Chemical Reactions A chemical reaction is the process of breaking of chemical bonds in one or more substances, and the reforming of new bonds to create. The Nature of Chemical Reactions Chapter 7.1 Notes. When a substance bubbles it may be a clue that a chemical reaction is taking...
Two substances are now in ___ with each other, and a chemical reaction is occurring.A. contract B. conflict C. connection D. contact 相关知识点: 试题来源: 解析 D 本题主要考查名词词义辨析。 A项,contract “合同;婚约;合约;契约”; B项,conflict “冲突”; C项,connection “联系;关系;连...
百度试题 结果1 题目The two substances are now in ___ with each other, and a chemical reaction is occurring. A. meet B. encounter C. face D. contact 相关知识点: 试题来源: 解析 D ? 正确答案:D
The students are observing a chemical reaction. There are some substances. One substance is changing color. What could it be? A. Salt B. Sugar C. Copper sulfate D. Sand 相关知识点: 试题来源: 解析 C。硫酸铜在化学反应中可能会变色,盐、糖和沙子通常不会变色,所以选 C。
The chemical reaction happens___adding two substances together. A. with B. by C. for D. at 相关知识点: 试题来源: 解析 B。by adding two substances together表示“通过把两种物质加在一起”,by表示“通过……方式”,符合语境。with表示“用”;for表示“为了”;at表示“在……”,均不符合题意。
method for the quantitative determination of substances that develop by chemical reaction and \\/ or physical variation of pressure.BENITO D'EUGENIO
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The first step in the chemical reaction is to ___ the substances together. A. mix B. separate C. burn D. freeze 相关知识点: 试题来源: 解析 A。本题考查动词词义。“mix”意为“混合”,化学反应的第一步通常是将物质混合在一起。“separate”意为“分离”,与题意不符;“burn”意为“燃烧”,...