第五课

five5

Who dissolves much more in water谁在水中溶解得多

1．There are still many secrets about dissolution, let's continue to study.

关于溶解的秘密还有很多，我们继续研究吧。

2．Material package材料包

3．salt, baking soda, etc.食盐、小苏打等。

Activity process活动过程

1. Add salt to a glass of water. Can salt dissolve all the time?

向一杯水中不断加食盐，食盐能一直溶解吗?

2. Try adding a small amount of salt first.先加少量食盐试试。

3. What happens if you keep adding salt?继续加食盐会怎么样?

Methodological guidance方法指导

4. Divide the salt into small parts, add 1 part each time, stir, wait until completely dissolved, then add the next 1 part.

将食盐分成若干小份，每次加1份，搅拌，等完全溶解后，再加入下1份。

5. who dissolves much more in 50 ml of water, salt and baking soda?

在50毫升水中，食盐和小苏打谁溶解得多?

6. We take 3 grams for 1 at a time.我们每次取3克作为1份。

Expand activities拓展活动

7. Can the water dissolve more baking soda? 水加热后，能溶解更多小苏打吗? 

8. Continue the experiment and record the experimental results. 继续进行实验，记录实验结果。