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- 1. Multiple ChoiceFill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO44, 51, 63, 82,2 - 2. Multiple ChoiceWhich side of a chemical equation is the product side?Left (before the yields sign)Right (after the yields sign)
- 3. Multiple ChoiceWhich problem is balanced?PbO2 + 2H2--> H2SO4SO2 + H20 --> H2SO42Na + 2H2O --> 2NaOH + H22Na + 2H2O --> 2NaOH + H
- 4. Multiple ChoiceWhat is a coefficient?The small number on the right of the chemical symbol.The large number to the left of a formula.
- 5. Multiple ChoiceBalance this equation
_Zn+_HCl-->_ZnCl2 +_H21,1,2,11,1,1,21,2,1,12,1,1,1 - 6. Multiple ChoiceBalance this equation.
_Mg + _Cl2 --> _MgCl21, 2,1already balanced2,1,11,1,2 - 7. Multiple ChoiceBalance this equation
_N2 + _H2 --> _NH31,2,31,3,21,1,22,1,1 - 8. Multiple ChoiceHow many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O32614
- 9. Multiple Choice
The blue numbers in the image below represent ________Chargescoefficientssubscriptsnone of the answers are correct - 10. Multiple ChoiceNumber of H in 3(NH₄)₂CrO₄46824
- 11. Multiple ChoiceBalance this equation:
P4+O2 --> P2O33 P4+ O2 --> 2 P2O3P4+ O2 --> 2 P2O3P4+ 3 O2 --> 2 P2O3P4+ 2 O2 --> 3 P2O3 - 12. Multiple ChoiceAt the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?the product is doubledthe product is half the mass of the reactantsthe mass is the samethe mass changes depending on the reaction
- 13. Multiple ChoiceBalance this equation,
Al2O3 --> Al + O2Cannot be balanced2Al2O3 --> 2Al+3O22Al2O3--> 4Al+3O23Al2O3--> 2Al+O2 - 14. Multiple ChoiceIn chemical reactions, what does the principle of conservation of mass mean?Matter is not created or destroyed.The total mass of the reactants is greater than the total mass of the products.The total mass of the reactants is less than the total mass of the products.Matter is not changed.
- 15. Multiple ChoiceWhen balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balancedchargesubscriptrandom numbercoefficient
- 16. Multiple Choice
PCl5 + ___ H2O → ___ HCl + H3PO4
4, 5
1, 6
3, 8
2,2
- 17. Multiple ChoiceMg + ___ HCl → MgCl2 + H21234
- 18. Multiple ChoiceWhich problem is balanced?PbO2 + 2H2SO2 + H20 --> H2SO42Na + 2H2O --> 2NaOH + H2
- 19. Multiple ChoiceBalance this equation.
_SnO2 +_H2-->_Sn +_H2O1,1,2,11,2,1,11,2,1,21,2,2,1 - 20. Multiple ChoiceIs the equation balanced?: 2H2O + O2 --> 4MgO + 3FeYesNo
- 21. Multiple ChoiceIs this equation balanced?yesnoNot enough information
- 22. Multiple ChoiceHow many atoms are there TOTAL in:
H2SO46573 - 23. Multiple ChoiceHow many atoms of carbon (C) are in C6H12O6?361224
- 24. Multiple ChoiceNumber of C's in 2Na₂CO₃1235
- 25. Multiple ChoiceHow many Magnesium are in 10MgCl2?10520
- 26. Multiple ChoiceHow many O's are in Al₂(SO₄)₃412724
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