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1 năm trước
Có 2 lọ, một lọ đựng nước,một lọ đựng nước đường. a) Làm thí nghiệm đơn giản như thế nào thì có thể xác định đâu là nước tinh khiết ,đâu là nước đường ? b) từ nước đường, làm thí nghiệm đơn giản như thế nào để thu được 1 ít tinh khiết và một ít đường trong trạng thái rắn ?
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