百度试题 结果1 题目Which of the following is an example of a chemical change? A. Melting ice B. Breaking a glass C. Burning wood D. Folding a paper 相关知识点: 试题来源: 解析 C。燃烧木材会产生新的物质,属于化学变化。反馈 收藏
A. A change in temperature. B. A change in volume. C. A change in mass. D. A change in position. 相关知识点: 试题来源: 解析 A。解析:温度变化是化学反应的一个标志。选项 B 体积变化不一定是化学反应引起的;选项 C 质量变化在一般化学反应中不太明显;选项 D 位置变化与化学反应无关。反馈...
25. Which one of the following is not a kind of chemical change?A. Iron rusting. B. Burning wood. C. Cooking an egg. D. Water boiling. 相关知识点: 试题来源: 解析 D D水沸腾(从液态变为气态)不是化学变化.A铁生锈,B木材燃烧和C煮鸡蛋都是化学变化.反馈 收藏 ...
Which of the following is NOT a sign of a chemical reaction? A. Color change B. Temperature rise C. Shape change D. Gas production 相关知识点: 试题来源: 解析 C。本题考查化学反应的标志。颜色变化、温度上升、产生气体都是化学反应的常见标志,形状改变通常不是化学反应的标志。
Which one of the following is not a kind of chemical change? A. Iron rusting. Burning wood. Cooking an egg. D. Water boiling. 相关知识点: 试题来源: 解析 D 钢铁生锈,木头燃烧,煮鸡蛋,都是发生了化学变化;而水被煮沸,是物理变化.是否是化学变化,就看是否产生了新的物质....
百度试题 结果1 题目 Asubstance produced by a living organism which helps a chemical change happen or happen more quickly, without being changed itself, is called an . 相关知识点: 试题来源: 解析 (1)enzyme 反馈 收藏
请教一句关于as a result of which的从句原句:We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new substance.句子的意思我能明白:我们可以
请教一句关于as a result of which的从句原句:We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new substance.句子的意思我能明白:我们可以说,化学是论述物质化学变化的科学,通过化学变化可能形成新的物质.但是...
谁能帮我分析一下这个句子.主要是中间两个which之间的部分,We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new substance.
<p><strong>Step-by-Step Solution:</strong></p><p>1. <strong>Understanding Chemical Change</strong>: - A chemical change occurs when substances undergo a transformation to form new substances. This process involves breaking and forming bonds between a