Unit of w ater in the third edition of tea ching science 5. How much can water dissolve panel discussion • To know how much salt and baking soda can be dissolved in the sam e amount of water, what are we g oing to do? What else should we pay attention t o? Read science books 13 and 14, and think about an d communicate what else you need to pay attentio n to: why is there as much water?How to add salt ?When will you join the second and third copies? When do you stop adding salt and baking soda?How do you know that salt and baking soda are comple tely dissolved? Experiment requirements and activi ty manual Complete the dissolution experiment of salt first, then t he dissolution experiment of sodium bicarbonate, and reco rd according to the dissolution of salt and sodium bicarb onate.When a portion of salt or baking soda is completely dissolved in water, mark a "×" in the table. At the end o f the experiment, count the number of "×" to indicate the number of dissolved portions of salt or baking soda. Class record of dissolving salt an d baking soda 小组 1 2 3 4 5 6 7 8 食盐 小苏打 The solubility of salt and baking soda in 我们的 water is different.The quantity of salt di 发现 ssolved is more than that of sodium bicarb onate. Discussion: • Why do we want to join in the a bove experiments one by one? What's the advantage of this add ition? If we want to know the solubility of the se kinds of things in water, how can we study them? Sugar monosodium glutamate Brown su gar Thank you

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