This is called___. A. physical change B. chemical combination C. melting D. boiling 相关知识点: 试题来源: 解析 B。解析:两种物质结合形成新物质叫做化学结合。选项 A 物理变化不符合;选项 C 融化是物理变化;选项 D 沸腾也是物理变化。反馈 收藏 ...
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
百度试题 结果1 题目The substances formed in a chemical reaction are called ___. A. products B. reactants C. catalysts D. solvents 相关知识点: 试题来源: 解析 A。化学反应中形成的物质被称为产物。反馈 收藏
A. decomposition. B. synthesis. C. combustion. D. neutralization. 相关知识点: 试题来源: 解析 B。解析:两种物质结合形成新物质的过程叫做合成。选项 A 分解是一种物质分解成多种物质。选项 C 燃烧是物质与氧气发生剧烈反应。选项 D 中和是酸和碱反应生成盐和水。反馈 收藏 ...
During the chemical reaction, the substances were heated,___ a new compound. A. 例文需例文需forming例文需例文需 B. 根常为接整消际根常为接整消际formed根常为接整消际根常为接整消际 C. 外改五流度响极应情组发江府红它阶即外改五流度响极应情组发江府红它阶即to form外改五流度响极应...
解析 B。解析:根据条件状语从句的时态规则,主句是一般将来时,从句要用一般现在时。a chemical reaction是第三人称单数,occur要变为occurs。A选项occur没有使用第三人称单数形式,C选项occurred是一般过去式,D选项occurring是现在分词,不能作谓语。反馈 收藏
In a chemical reaction, if the reactants are changed into different substances with new properties, it is called a(n) ___ reaction. A. physical B. chemical C. mechanical D. electrical 相关知识点: 试题来源: 解析 B。在化学反应中,反应物变成具有新性质的不同物质,这是化学变化,即化学反应...
The meaning of CHEMICAL REACTION is a chemical change that occurs when two or more substances combine to form a new substance.
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...
Formulas written on the left side of the arrow symbol are the substances formed in a chemical reaction. Product Formulas written on the right side of the arrow symbol are the new substances formed in a chemical reaction. Yields An arrow symbol that shows a reaction has taken place. The react...