The boiling of water is a(n) ___. A. chemical reaction B. physical change C. electrical reaction D. biological change 相关知识点: 试题来源: 解析 B。解析:水沸腾是物理变化,只是状态改变,没有新物质生成。选项 A 化学反应会有新物质生成,不符合。选项 C 电反应与题目无关。选项 D 生物变化不符...
Is freeze drying a physical change or a chemical change? Is melting ice a chemical change? Is melting a chemical change? Is a change in temperature a chemical reaction? Is sublimation a physical or chemical change? Is changing the state of matter a chemical or physical change?
Solubility is a physical property. The reason is because it can be determined by simple observation and does not change the chemical composition of the material. For example, when salt dissolves in water, it is still salt. Whether a material is soluble in a solvent or not can be found by ...
Which change of state involves a release of energy? Boiling, condensation, melting, or sublimation? What must be changed, temperature or heat energy, during condensation? Water vapor makes up what percentage of atmospheric gases? Is condensation a chemical or physical change?
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Water changing its state of matter is a physical change. So, how can the state of change be classified as either endothermic or exothermic reaction as in a chemical reaction? Explain. Where does the energy come from that is needed for an e...
Physical properties are those that a substance shows by itself, without changing into or interacting with another substance. Some physical properties are color, smell, temperature, boiling point, electrical conductivity, and density. A physical change is a change that does not alter the chemical ...
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Pasteurization of foods and beverages is a physical change. Pasteurization process was invented by Louis Pasteur in 1864. ... The process involves killing