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- 1. Multiple-choice15 minutes1 ptWhat coefficient should be used to make the following equation balanced?
N2+O2--> _NO1234 - 2. Multiple-choice15 minutes1 ptWhich problem is balanced?
(Check ALL answers)PbO2 + 2H2SO2 + H20 --> H2SO42Na + 2H2O --> 2NaOH + H2 - 3. Multiple-choice15 minutes1 ptHow many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H21234 - 4. Multiple-choice15 minutes1 pt
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
2,6,3,2
it's already balanced
4,12,3,4
2,1,4,5
- 5. Multiple-choice15 minutes1 ptWhich of the following equations are correctly balanced?12CO2 +H2O --> C6H12O6 + O2CO2 + 9H2O --> C6H12O6 + O2CO2 + H2O --> 3C6H12O6 + O26CO2 + 6H2O --> C6H12O6 + 6O2
- 6. Multiple-choice15 minutes1 pt
Balance the following equation:
___ H2+ ___ O2→___ H2O
1, 1, 3
2, 2, 2
1, 2, 1
2,1, 2
- 7. Multiple-choice15 minutes1 pt
Balance the following equation:
___ Mg+ ___ O2→___ MgO
1, 1, 3
2, 1, 2
1, 2, 1
2, 2, 2
- 8. Multiple-choice15 minutes1 pt
Balance the following equation:
___ SeCl6+ ___ O2→___ SeO2+____Cl2
1, 1, 1, 3
2, 1, 2, 1
1, 2, 1, 2
2, 2, 2, 4
- 9. Multiple-choice15 minutes1 ptBalance this equation
_Zn+_HCl-->_ZnCl2 +_H21,1,2,11,1,1,21,2,1,12,1,1,1 - 10. Multiple-choice15 minutes1 ptBalance this equation
_N2 + _H2 --> _NH31,2,31,3,21,1,22,1,1 - 11. Multiple-choice15 minutes1 ptBalance this equation:
P4+O2 --> P2O33 P4+ O2 --> 2 P2O3P4+ O2 --> 2 P2O3P4+ 3 O2 --> 2 P2O3P4+ 2 O2 --> 3 P2O3 - 12. Multiple-choice15 minutes1 ptBalance this equation...
HgO --> 2Hg + O2It is balanced2HgO --> Hg + O22HgO --> 2Hg + O2I don't know...Oh well! - 13. Multiple-choice15 minutes1 ptBalance this equation...
H2 + Cl2 --> HClIt is balanced3H2 + Cl2 --> 6H2ClH2 + Cl2 --> 2HClI don't know! Oh well. - 14. Multiple-choice15 minutes1 ptWhich of the following is an unbalanced equation?CaCO3 --> CaO + CO2PbO2 + 2H2-->2Pb + H2O2Na+ 2H2O-->2NaOH + H2CS2 + 2O2 --> CO2 + 2SO2
- 15. Multiple-choice15 minutes1 ptWhich of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O34Fe + 3O2 -> 2Fe2O32 Fe + 3O2 -> Fe2O64 Fe + O6 -> 2Fe2O3None of the options are correctly balanced. - 16. Multiple-choice15 minutes1 ptA sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?Mass is less than 13 gramsMass is equal to 13 gramsMass is greater than 13 gramsMass cannot be measured
- 17. Multiple-choice15 minutes1 ptWhat is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO23,1 --> 2,33,2 --> 1,13,2 --> 2,43,2 --> 2,1
- 18. Multiple-choice15 minutes1 pt
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?
__Ca + __H2O --> __Ca(OH)2 + __H2
2,1 --> 2,11,2 --> 1,11,2 --> 2,41,2 --> 2,1
