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Chemistry
10th -
12thgrade
Lesson 26 Independent Practice: Law of Conservation of Mass
18 questions
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- 1. Multiple Choice
Zn (65.4g) + 2HCl (72.9g) → ZnCl2 (?g) + H2 ( 2.0g)
How much zinc chloride was produced in the equation above?
9.7 g
136.3 g
74.9 g
138.6 g
- 2. Multiple Choice
2K + Br2 → 2KBr
39.1grams of potassium reacts with Bromine. Assuming all of the reactants are used up, how much bromine was used if 119.0 grams of potassium bromide was produced?
104 g
3.04 g
79.9 g
158.1 g
- 3. Multiple Choice
O2 + 2H2 → 2H2O
Which of the following statements accurately describes the reaction shown above?
The mass of the oxygen and hydrogen gases are less than the mass of water.
The mass of the oxygen and hydrogen gases are greater than the mass of water.
The mass of the oxygen and hydrogen gases are double the mass of water.
The mass of the oxygen and hydrogen gases are equal to the mass of water.
- 4. Multiple Choice
C + O2 → CO2 + unreacted C
When 40.0 g of carbon reacts with 32.0 g oxygen gas to form carbon dioxide, these is some carbon left over at the end of the reaction. If only 44.0 g of carbon dioxide is produced, how much carbon is left over?
126.0 g
8.0 g
28.0 g
4.0 g
- 5. Multiple Choice
2HgO (60.0 g) → O2 (4.2 g) + 2Hg (?g)
According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?
60.0 g
64.2 g
55.8 g
126.0 g
- 6. Multiple Choice
Is this reaction balanced?
4Fe +3O2 → 2Fe2O3
Use accounting method on paper backup which will be turned in for completion of assignment.
yes
no
- 7. Multiple Choice
Is this reaction balanced?
NaOH + HNO3 → NaNO3 + H2O
Use accounting method on paper backup which will be turned in for completion of assignment.
yes
no
- 8. Multiple Choice
Is this reaction balanced?
I2 + Na → 2NaI
Use accounting method on paper backup which will be turned in for completion of assignment.
yes
No
- 9. Multiple Choice
Is this reaction balanced?
2Zn + O2 → 2ZnO
Use accounting method on paper backup which will be turned in for completion of assignment.
yes
no
- 10. Multiple Choice
Which set of coefficients will balance this reaction?
CO2 + H2O → C6H12O6 + O2
(show work on separate paper for each set of coefficients which will be turned in for completion of grade)
6,6,2,6
6,12,6,2
6,6,1,6
6,2,1,4
- 11. Multiple Choice
Which set of coefficients will balance this reaction?
Mg + O2 → MgO
(show work on separate paper for each set of coefficients which will be turned in for completion of grade)
2,2,1
2,1,2
1,1,1
1,2,1
- 12. Multiple Choice
Which product will balance the following reaction?
Cu + H2SO4 → H2 + ?
CuSO3
CuS2O4
CuSO4
2CuSO2
- 13. Multiple Choice
Cu + O2 → CuO
When the above equation is balanced, what would be the coefficient on copper (II) oxide?
(show work on separate paper which will be turned in for completion of grade)
1
2
3
4
- 14. Multiple Choice
C + S → CS2
When the above equation is balanced, what would be the coefficient on sulfur?
(show work on separate paper which will be turned in for completion of grade)
0
1
2
4
- 15. Multiple Choice
Li + N2 → Li3N
When the above equation is balanced, what would be the coefficient on lithium nitride?
(show work on separate paper which will be turned in for completion of grade)
1
2
3
4
- 16. Multiple Choice
H2SO4 + LiOH → H2O + Li2SO4
When the above equation is balanced, what would be the coefficient on water?
(show work on separate paper which will be turned in for completion of grade)
0
1
2
4
- 17. Multiple Choice
NaHCO3 → NaOH + CO2
When the above equation is balanced, what would be the coefficient on sodium hydroxide?
(show work on separate paper which will be turned in for completion of grade)
1
2
3
4
- 18. Multiple Choice
B + H2 → BH3
When the above equation is balanced, what would be the coefficient on boron?
(show work on separate paper which will be turned in for completion of grade)
0
1
2
4
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