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  • 1. Which of the following describes the rule that mass is neither created nor destroyed during a chemical reaction (this is why we have to balance chemical equations)?

A) Law of Conservation of Mass
B) Law of Gravity
C) Law of Evolution
D) Law of Chemistry

  • 2. Which of the following is described as a short, easy way to show a chemical reaction, using symbols instead of words?

A) chemical symbol
B) chemical formula
C) chemical reaction
D) chemical equation

  • 3. Which of the following desribes a substance that enters into a chemical reaction?

A) yield
B) product
C) coefficient
D) reactant

  • 4. Which of the follwing describes a substance that is formed as a result of a chemical reaction?

A) reactant
B) subscript
C) yield
D) product

  • 5. Which of the following describes a number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction?

A) coefficient
B) superscript
C) precipitate
D) subscript

  • 6. Which of the following describes a small number that cannot be changed when balancing a chemical formula?

A) superscript
B) coeffiecient
C) subscript
D) precipitate

  • 7. Balance the following equation on your own sheet of paper. ___SnO2 + ___H2 --> ___Sn + ___H2O. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.

A) The coefficient in front of H2 on the reactants side is 2.
B) The coefficient in front of H2 on the reactants side is 1.
C) The coefficient in front of SnO2 on the reactants side is 2.
D) The coefficient in front of H2O on the products side is 1.

  • 8. Balance the following equation on your own sheet of paper. ___Mg + ___O2 --> ___MgO. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.

A) The coefficient in front of the O2 on the reactants side is 2.
B) The coefficient in front of the MgO on the products side is 1.
C) The coefficient in front of the Mg on the reactants side is 2.
D) The coefficient in front of the O2 on the reactants side is 3.

  • 9. Balance the following equation on your own sheet of paper. ___Li + ___O2 --> ___Li2O. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.

A) The coefficient in front of the O2 on the reactants side is 3.
B) The coefficient in front of the Li on the reactants side is 4.
C) The coefficient in front of the O2 on the reactants side is 2.
D) The coefficient in front of the Li2O on the products side is 1.

  • 10. Balance the following equation on your own sheet of paper. ___ScF3 + ___K --> ___Sc + ___KF. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.

A) When the equation is balanced, the number of Scandium atoms (Sc) is 2 on both the reactants and products sides.
B) When the equation is balanced, the number of Fluorine atoms (F) is 1 on both the reactants and products sides.
C) When the equation is balanced, the number of Potassium atoms (K) is 3 on both the reactants and products sides.
D) When the equation is balanced, the number of Potassium atoms (K) is 1 on both the reactants and products sides.

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Arkansas State University
Department of Chemistry
and Physics
Worksheets

Balancing Equations


 
 

Problems with*** are the most difficult.  If you can balance these, you can balance any equation given in class.
 

1.            C3H8    +    O2    g      CO2      +     H2O
 

2.           Al2(SO3)3   +   NaOH  g   Na2SO3    +   Al(OH)3
 

3.           Al2O3    +   Fe  g   Fe3O4    +     Al
 

4.            KClO3   g   KCl   +  O2
 

5.            NH4NO3  g    N2O    +    H2O
 

6.            NaHCO3   g   Na2CO3   +    H2O    +   CO2
 

7.            P4O10     +    H2O  g     H3PO4
 

8.            Al    +    H2SO4    g     Al2(SO4)3     +    H2
 

9.            Be2C   +    H2O   g    Be(OH)2     +   CH4
 

10.***     S    +   HNO3   g    H2SO4   +    NO2   +   H2O
 

11.            NH3   +   CuO  g    Cu   +   N2   +   H2O
 

12.***      Cu   +    HNO3   g   Cu(NO3)2    +   NO   +    H2O

answers
 
 

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Balancing Chemical Equations Practice Problems Worksheet (Video) with Answers

Balancing Equations Test Questions

Question 1

Balance the following equation:

__ SnO2 + __ H2 → __ Sn + __ H2O

Question 2

Balance the following equation:

__ KOH + __ H3PO4 → __ K3PO4 + __ H2O

Question 3

Balance the following equation:

__ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3

Question 4

Balance the following equation:
__ Na3PO4 + __ HCl → __ NaCl + __ H3PO4

Question 5

Balance the following equation:

__ TiCl4 + __ H2O → __ TiO2 + __ HCl

Question 6

Balance the following equation:

__ C2H6O + __ O2 → __ CO2 + __ H2O

Question 7

Balance the following equation:

__ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 + __ H2

Question 8

Balance the following equation:

__ NH3 + __ O2 → __ NO + __ H2O

Question 9

Balance the following equation:

__ B2Br6 + __ HNO3 → __ B(NO3)3 + __ HBr

Question 10

Balance the following equation:

__ NH4OH + __ Kal(SO4)2·12H2O → __ Al(OH)3 + __ (NH4)2SO4 + __ KOH + __ H2O

Answers

1. 1 SnO2 + 2 H2 → 1 Sn + 2 H2O
2. 3 KOH + 1 H3PO4 → 1 K3PO4 + 3 H2O
3. 2 KNO3 + 1 H2CO3 → 1 K2CO3 + 2 HNO3
4. 1 Na3PO4 + 3 HCl → 3 NaCl + 1 H3PO4
5. 1 TiCl4 + 2 H2O → 1 TiO2 + 4 HCl
6. 1 C2H6O + 3 O2 → 2 CO2 + 3 H2O
7. 2 Fe + 6 HC2H3O2 → 2 Fe(C2H3O2)3 + 3 H2
8. 4 NH3 + 5 O2 → 4 NO + 6 H2O
9. 1 B2Br6 + 6 HNO3 → 2 B(NO3)3 + 6 HBr
10. 4 NH4OH + 1 Kal(SO4)2·12H2O → 1 Al(OH)3 + 2 (NH4)2SO4 + 1 KOH + 12 H2O

Tips for Balancing Equations

When balancing equations, remember chemical reactions must satisfy conservation of mass. Check your work to make certain you have the same number and type of atoms on the reactants side as on the products side. A coefficient (number in front of a chemical) is multiplied by all the atoms in that chemical. A subscript (lower number) is only multiplied by the number of atoms it immediately follows. If there is no coefficient or subscript, that is the same as a number "1" (which is not written in chemical formulas).

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Key balancing answer equations test

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How to Balance Chemical Equations in 5 Easy Steps: Balancing Equations Tutorial

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