
KHTN 8
Quiz
•
Science
•
8th Grade
•
Practice Problem
•
Easy
Thu Nguyen
Used 1+ times
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28 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ở 25 oC và 1 bar, 0,25 mol khí chiếm thể tích bao nhiêu?
12,487 lít.
6,1975 lít.
11,2 lít.
22,4 lít.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Carbon cháy trong không khí cho sản phẩm tạo ra là CO2. Phương trình phản ứng đúng của phản ứng trên là
C + 2O2 → 2CO2.
3C + O2 → 3CO2.
4C + 5O2 → 2CO.
C + O2 → CO2.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Phosphorus cháy trong không khí cho sản phẩm tạo ra là P2O5. Phương trình phản ứng đúng của
phản ứng trên là
P + O2 → P2O5.
4P + 5O2 → 2P2O5.
P + 2O2 → P2O5.
P + O2 → P2O3.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trong 0,3 lít dung dịch có hòa tan 0,045 mol sodium hydroxide. Nồng độ mol của dung dịch là
0,2M.
0,25M.
0,3M
0,15M
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tỉ khối hơi dA/B của khí A so với khí B được xác định bởi công thức
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Sodium hydroxide là chất rắn, không màu, dễ nóng chảy, hút ẩm mạnh, tan nhiều trong nước và
tỏa ra một lượng nhiệt lớn. Công thức của sodium hydroxide
NaOH
Na2CO3.
NaHCO3.
Ca(OH)2.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Công thức của Potassium hydroxide là
K2CO3.
NaHCO3.
KOH.
NaHCO3.
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