to liquid is a physical change.When butter is heated, it becomes liquid. When it cools down, it turns back into solid butter. Whether it is solid or liquid, it is still butter. This change, like all changes of state, is a physical change.A large lump of dough can be rolled out ...
PHYSICAL AND CHEMICAL CHANGE - GRADE 10 ? Prestik Method: 1. Choose a reaction from any that have been used in this chapter or any other balanced chemical reaction that you can think of. To help to explain this activity, we will use the decomposition reaction of calcium carbonate to ...
绝对是chemical change chemical change是指original chemicals(s) change into new chemical(s)，例如：电解水份会有氢气和氧气 H2O→H2+O2 (未平衡化学式) physical change是指形态上的转换，不会有new matter，例如：水沸腾变成水蒸气 H2O(liquid)→H2O(gas) 金属(original substance)和空气中的氧气...
根据第四段的陈述以及该段最后一句话“Sothe dissolving of anything is a physical change. "可得出答案。23.C推理判断题。从文章最后一段可以得出正确答案。 相关推荐 1 IⅣ.阅读理解(2017·辽宁省实验中学)Chemical Change and Physical ChangeThere are two kinds of changes chemicalchange and physical change...
Chemical Change and Physical Change There are two kinds of changes-chemical change and physical change.In a chemical change, there is always a new substance formed. Breaking up water into hydrogen and oxygen is a chemical change. In each of the chemical change at least one new substance is ...
正如你所说的：chemical就是有新的物质出来,physical就是没有新的物质。冰化水，成分没有变，都是水分子，应该是physical change；bake a cake既有physical change又有chemical change.很多时候都是physical/chemical并存的，不能说单纯产生了哪一种。
Physical vs Chemical Change Chemistry is the study of the properties and interactions of chemical substances. Consider a ball of dough rising before being put into an oven. While a baker may see a lump of uncooked bread proofing before baking, a chemist would be interested in the chemical ...
change?答:不一定 有时chemical change反应吸收或放出热量很少 难以察觉 但依然是chemical change 第二个化学品加了水,温度变化了,但是颜色没有变化算不算chemical change呢!?答:当然不一定算啦 温度变化了但不一定是chemical change，比如氢氧化钙溶于水就会使温度升高，但溶解就不属于化学变化 产生...
【题目】阅读理解Chemical Change and Physical Change There are two kinds of changes-chemical change and physical change.In atchemical change, there is always a new sub-stance formed. Breaking up water into hydrogen and oxy-gen is a chemical change. In each of the chemical change at least one...
change, like all changes of state, is a physical change. A large lump of dough can be rolled out flat with a rolling pin. Only its shape has changed. It is the same dough, with the same chemical composition. The change of shape of an ...