Oxygen. Không khí
Quiz
•
Chemistry
•
6th Grade
•
Practice Problem
•
Medium
Sơn Nguyễn Thái
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19 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Oxygen is a living element that humans and animals require to live.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Chọn câu đúng
Oxygen là chất khí, tan ít trong nước và nặng hơn không khí.
Oxygen là chất khí, tan vô hạn trong nước và nặng hơn không khí.
Oxygen là chất khí, tan ít trong nước và nhẹ hơn không khí.
Oxygen là chất khí, tan vô hạn trong nước và nhẹ hơn không khí.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Nguyên nhân nào sau đây không gây ô nhiễm không khí?
Cháy rừng
Khí thải do sản xuất công nghiệp, do hoạt động của phương tiện giao thông
Hoạt động của núi lửa
Khí sinh ra từ quá trình quang hợp của cây xanh
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Vai trò của Oxygen?
Duy trì sự cháy
Duy trì sự sống
Dập tắt đám cháy
Duy trì sự cháy và sự sống
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
...... gas does not burn, but it helps in burning.
Nitrogen
Oxygen
Carbon dioxide
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What is the percentage existence of oxygen gas in air?
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If all the trees on Earth were destroyed, what would be the effect on humans?
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