Unit 2 第二单元 Change of matter 物质的变化 The material world is as exciting as the living world. 物质世界与生命世界同样精彩。 The colorful material world is full of surprising, confusing, and exclamatory phenomena. 五光十色的物质世界充满了令人惊奇、迷惘、感叹的现象。 We are living in the material world, and the world around us is closely related to the changes in matter. 我们就生活在物质世界中，我们周围的世界与物质的变化息息相关。 Let's study this ever-changing material world together. 让我们一起研究这个多变的物质世界吧。 5 Variation of candles蜡烛的变化 Under different conditions, the same substance will change differently. Let's study it together. 在不同条件下，同一物质会发生不同的变化。 Let's study it together. 我们一起来研究吧。 Wooden strips 木条 Flour 面粉 Play-Doh 橡皮泥 Paper 纸 Let's observe the change of the candle. 我们来观察蜡烛的变化。 Experimental record sheet 实验记录表 Name Experimental method Phenomenon 名称 实验方法 现象 Ignite 点燃 Candles Heating 蜡烛 加热 ······ No new material is produced by heating and cutting. 加热、切割没有产生新物质。 When a candle burns, it produces a new substance - smoke. 蜡烛燃烧时会产生新的物质——烟。 What are other similar changes in life? 生活中还有哪些类似的变化？ Changes like candles melting, paper folding, or iron melting are just changes in form; changes like candles and wood burning are not just changes in form, but also produce new substances. 像蜡烛熔化、纸折叠、铁熔化这样的变化，仅仅是形态发生了变化；像蜡烛、木块燃烧这样的变化，不仅仅是形态发生了变化，还会产生新的物质。 Make face or clay sculptures. 做面塑或泥塑。. In life, people often need to change the form of a substance or make it produce a new substance. 生活中，人们经常需要改变物质的形态或使其产生新的物质。 Let's find out and try to do it. 我们去找一找，试着做一做。 |
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