Bài giảng Đề kiểm tra hóa 9 (45 phút) -Bài số 2
1. Để dập tắt đám cháy xăng dầu người ta dùng cách :(1) phun nước vào đám cháy , (2)dùng chăn ướt trùm lên ngọn lửa, (3)phủ cát vào ngọn lửa . Câu trả lời đúng là :
A.1 . B. 1 ,2 . C. 1, 3. D. 2, 3.
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. b, Hãy giải thích tại sao :khi quạt gió vào bếp củi vừa bị tắt ,lửa sẽ bùng cháy .Khi quạt gió vào ngọn nến đang cháy , nến sẽ tắt . 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