Kiểm tra Hóa 8 - 15 phút- Chủ đề oxi
Flashcard
•
Mathematics
•
KG
•
Hard
Wayground Content
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10 questions
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1.
FLASHCARD QUESTION
Front
Điều chế oxi trong phòng thí nghiệm bằng KClO3, KMnO4, KNO3 vì:
Back
Giàu oxi, dễ phân hủy.
2.
FLASHCARD QUESTION
Front
Người ta thu khí oxi qua nước là do:
Back
Khí oxi tan ít trong nước.
3.
FLASHCARD QUESTION
Front
Phản ứng hóa hợp: CaO + H₂O → Ca(OH)₂.
Back
CaO + H₂O → Ca(OH)₂.
4.
FLASHCARD QUESTION
Front
Phát biểu đúng về khí oxi:
Back
Ở nhiệt độ cao, khí oxi dễ dàng tác dụng với nhiều chất (kim loại, phi kim) và hợp chất.
5.
FLASHCARD QUESTION
Front
Quá trình nào không làm giảm oxi trong không khí?
Back
Sự quang hợp của cây xanh.
6.
FLASHCARD QUESTION
Front
Phản ứng phân hủy:
Back
2KMnO₄ → K₂MnO₄ + MnO₂ + O₂.
7.
FLASHCARD QUESTION
Front
Phản ứng hóa học có oxi hóa:
Back
S + O₂ → SO₂.
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