Câu 1: Một trong những tính chất nào sau đây cho biết chất lỏng là tinh khiết? A. Không tan trong nước. B. Có vị ngọt, mặn, chua. C. Không màu, không mùi, không vị. D. Khi đun chất sôi ở nhiệt độ nhất định và chất hoá rắn ở nhiệt độ không đổi. Câu 2: Chất tinh khiết là A. Chỉ 1 chất. B. Nhiều chất. C. Một nguyên tố. D. Một nguyên tử. Câu 3: Hỗn hợp là: A. Nhiều nguyên tử. B. Một chất. C. Nhiều chất trộn lẫn vào nhau. D. Nhiều chất để riêng biệt.

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