When we heat water, it starts to boil. This is a ___ change. A. chemical B. physical C. natural D. artificial 相关知识点: 试题来源: 解析 B。“chemical”指化学变化;“physical”指物理变化,水加热沸腾是物理变化;“natural”意为“自然的”;“artificial”意为“人工的”。所以选 B。 反馈 ...
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If you hope to try potato milk, you’ll be happy to know that you can make it yourself at home. Generally, you just boil the potato, then mix it with the water it is boiled in, strain (过滤) it and add more water until it is what you want. ...
Is evaporation of water a physical change or chemical change? Once the ice cube melts, what happens to the liquid water that it produces? What chemical reaction produces water? When water begins to boil, hot water at the bottom rises and replaces the cold water at the top. Heat is tran...
phase change,phase transition,physical change,state change- a change from one state (solid or liquid or gas) to another without a change in chemical composition smoke,smoking- a hot vapor containing fine particles of carbon being produced by combustion; "the fire produced a tower of black smoke...
→Then, boil the black tea until the water turns light brown. 3 Add 1/4 or 1/2 cup of ice, it will melt (溶解) and bring the tea down to a room temperature. →Next, pour the milk into the tea, and mix them up. →After that, add sugar or honey to adjust (调整) the ...
Mixturesdo not have fixed precise melting and boiling points (whichelementsandcompoundsdo have), but instead mixtures melt / freeze and boil / condense over a range of temperatures according to the physical properties of the different constituents of the mixture. ...
Therefore, people began to crush the beans into small pieces — and then boil the pieces in hot water — and make a hot drink. Gradually, it became common to drink this hot beverage in Ethiopia. Next, the hot coffee drink became popular among Arab travelers who visited Ethiopia. The ...