Tính theo PTHH
Quiz
•
Science
•
8th Grade
•
Medium
Thuý Nguyễn
Used 2+ times
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Câu 1. Sau khi đốt cháy than tổ ong (thành phần chính là carbon) thì thu được xỉ than. Xỉ than nhẹ hơn than tổ ong vì:
A. Than cháy sinh ra khí CO2
B. Than cháy sinh ra khí O2
C. Than cháy chưa hết
D. Than cháy sinh ra nhiệt
2.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Câu 2. Khi tính toán theo phương trình hóa học, cần thực hiện mấy bước cơ bản?
A. 1 bước
B. 2 bước
C. 3 bước
D. 4 bước
3.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Câu 3. Công thức tính số mol khi biết khối lượng là:
C. m = n.M
D. V = 24,79.n
4.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Câu 4. Cho phương trình hóa học C + O2 → CO2.
Để thu được 0,1 mol khí CO2, cần dùng số mol C là:
A. 2 mol
B. 1 mol
C. 0,1 mol
D. 0,2 mol
5.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Câu 5. Cho PTHH: Fe + 2HCl → FeCl2 + H2
Số mol Fe cần dùng để tác dụng với 2 mol HCl là:
A. 2 mol
B. 1 mol
C. 0,1 mol
D. 0,2 mol
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