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nhtruc77
2 năm trước
câu 1: Thế nào là sự sôi? Sự bay hơi, sự sôi khác nhau và giống nhau ở điểm nào? câu 2: Dựa vào đồ thị vẽ đường biểu diễn sự thay đổi nhiệt độ theo thời gian khi đun nóng một chất A trả lời câu hỏi sau: 1) Nhiệt độ nóng chảy của chất A là (90 độ C) chất A là... 2) thời gian nóng chảy của chất rắn là (10 phút) ở 70 độ C chất A tồn tại ở thể... câu 3: tại sao vào mùa lạnh khi hà hơi vào mặt gương ta thấy mặt gương mờ đi rồi sau một thời gian mặt gương sáng trở lại? câu 4: Nam muốn ăn thức ăn nóng và định bỏ thịt hộp đóng hộp mới mua vào xoong nước để đun sôi lên. Mẹ vội vàng ngăn lại và nói rằng làm thế rất nguy hiểm. Em hãy giải thích cho Nam vì sao không được làm thế và phải làm như thế nào mới được? giúp mình với ạ :<<<<< 30 điểm lận nha
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