Skip to Content
10 questions
Show Answers
See Preview
- 1. Multiple-choice5 minutes1 pt
Which of the following gas samples would have the largest number of molecules at STP?
0.10 L NO
0.007 L CO2๏ปฟ
15.0 L HCl
7.0 L Br2
- 2. Multiple-choice5 minutes1 pt
How many molecules are in 3 mol NO?
3.49 x10-24 molecules
3.79x1024 molecules
1.26x1024 molecules
1.806 x1024 molecules
- 3. Multiple-choice5 minutes1 pt
How many moles of CaBr2 are in 5.0 grams of CaBr2?
1000 mol
0.025 mol
4.0 mol
0.042 mol
- 4. Multiple-choice5 minutes1 pt
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen?
12.0 g
47.8 g
23.9 g
95.6 g
- 5. Multiple-choice5 minutes1 pt
The molar volume of a gas at STP occupies ____.
00C
1 kilopascal
22.4 L
12 grams
- 6. Multiple-choice5 minutes1 pt
โฆโฆโฆโฆ..S8 + โฆโฆโฆ..O2 โฆโฆโฆโฆ..SO2
1,8,8
8,8,1
8,1,8
2,1,2
- 7. Multiple-choice5 minutes1 pt
โฆโฆโฆAlCl3 + โฆโฆโฆโฆ.KOH โฆโฆโฆAl(OH)3 + โฆโฆโฆ.KCl
the numbers that balance this equation are3,1,3,1
1,3,1,3
3,3,1,1
1,1,3,3
- 8. Multiple-choice5 minutes1 pt
Which of the following gases at STP would have the greatest volume?
0.200 mole of SO2
1.00 mole of N2
5.00 mole of H2S
4.00 mole of HBr
- 9. Multiple-choice5 minutes1 pt
The molar mass of calcium carbonate is ........ gm
50
86
100
200
- 10. Multiple-choice5 minutes1 pt
A chemical formula written over the arrow in a chemical equation signifies
a by-product.
the formation of a gas.
a catalyst for the reaction.
an impurity.
