
Hóa
Quiz
•
Chemistry
•
6th - 8th Grade
•
Easy
Bích Ngọc
Used 2+ times
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Trong 8,4 g sắt có bao nhiêu mol sắt ?
0.15
0.2
0.015
0.05
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Số Avogadro có giá trị là
6.023x10^23
6.024x10^23
6.022x10^24
6.023x10^25
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
0.2 mol magie có khối lượng là
4.8 g
5.6g
3.2g
4.5 g
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Đun nhẹ 40 gam dd NaCl cho đến khi nước bay hơi hết, người ta thu được 8 gam muối NaCl khan. Tính nồng độ phần trăm của dd ban đầu ?
40%
20%
30%
50%
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Tính khối lượng chất tan cần dùng để pha chế 50g dung dịch MgCl2 4%.
3g
4g
2g
3g
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Một hỗn hợp khí X gồm 0,25 mol khí SO2; 0,15 mol khí CO2; 0,65 mol khí N2và 0,45 mol khí H2. Tính khối lượng hỗn hợp khí X
47.5 g
46.5 g
50 g
46 g
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Phần trăm K trong KNO3
40.2
38.6
47.5
13.9
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