What is the chemical reaction when copper is oxidized? A. Copper + Oxygen → Copper oxide B. Copper + Hydrogen → Copper hydride C. Copper + Nitrogen → Copper nitride D. Copper + Carbon → Copper carbide 相关知识点: 试题来源: 解析 A。解析:铜氧化时,铜与氧气反应生成氧化铜,这是铜氧化...
The alternative equation is also balanced and does not call for matter to be created or destroyed. Let's express the reaction in words in case someone is reading the chemical notation incorrectly: On the left side we have one atom of copper metal at oxidation state zero and two molecules of...
A. Change in color B. Formation of new substances C. Change in state D. Change in shape 相关知识点: 试题来源: 解析 B。化学反应的主要特征是有新物质生成。A 选项颜色改变可能是物理变化也可能是化学变化。C 选项物质状态改变是物理变化。D 选项形状改变是物理变化。反馈 收藏 ...
A. The total mass of the reactants is greater than the total mass of the products. B. The total mass of the reactants is less than the total mass of the products. C. The total mass of the reactants is equal to the total mass of the products. D. The total mass of the react...
In order for the chemical reaction to take place smoothly, what condition is needed? A. presence of a catalyst B. absence of oxygen C. high humidity D. low light intensity 相关知识点: 试题来源: 解析 A。考查化学反应条件。选项 A 有催化剂存在可以使化学反应更顺利地进行。选项 B 没有氧气...
百度试题 结果1 题目What is the difference between a chemical reaction and a physical change?相关知识点: 试题来源: 解析 Chemical changes produce new substances,not a physical change 反馈 收藏
In a chemical reaction, two substances combine to form a new substance. What is this process called? 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 ...
Step-by-Step Solution:1. Understanding Chemical Reactions: - A chemical reaction involves the transformation of reactants into products. It is essential for studying the behavior of substances when they inte
In a chemical reaction, if the pressure is increased, what will happen to the reaction rate? A. Decrease B. Remain unchanged C. Increase D. Depend on the reaction 相关知识点: 试题来源: 解析 C。解析:对于有气体参与的反应,增加压力通常会增加反应速率,因为压力增加会使气体分子间距离减小,碰撞...
In a chemical reaction, iron reacts with oxygen to form rust. What is the English name for iron? A. Copper B. Aluminum C. Iron D. Silver 相关知识点: 试题来源: 解析 C。本题考查铁的英文名称。选项 A 是铜,选项 B 是铝,选项 D 是银。只有选项 C 是铁。