Name__________________________________
Date _______________
Lab: PhET Balancing Chemical Equations
https://phet.colorado.edu/en/simulation/balancing-chemical-equations
1. Use the simulation to adjust the coefficients and balance the following equation. Select the balance
scales and bar charts to help. Fill in the proper coefficients when you are successful (yellow smiley face).
____ N2 + ____ H2  ____ NH3
2. Draw the particle view of the balanced equation as shown in the simulation.
3. Describe the purpose of the balance scales and bar charts in the simulation.
4. In order for a chemical equation to be properly balanced, what must be true?
5. Balance the other two examples.
Separate of water
___ H2O  ___ H2 + ___ O2
Combustion of methane
___ CH4 + ___ O2  ___ CO2 + ___ H2O
6. The number placed in front of a formula is called a coefficient. The small number within a chemical
formula is called a subscript. Why do we adjust coefficients when balancing chemical equations and not
subscripts?
GAME - Record your score for each of the levels in the balancing game:
Level 1 ______ / 10
Level 2 ______ / 10
Level 3 ______ / 10
HW: Balancing Chemical Equations
Balance the Equations
Identify Type of Equation
1.
____ H2 + ____ O2 → ____ H2O
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2.
____ N2 + ____ H2 → ____ NH3
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3.
____ HgO → ____ Hg + ____ O2
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4.
____ C10H16 + ____ Cl2 → ____ C + ____ HCl
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5.
____ Zn + ____ HCl → ____ ZnCl2 + ____ H2
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6.
____ Fe2(SO4)3 + ____ KOH → ____ K2SO4 + ____ Fe(OH)3 ________________________________
7.
____ P2O5 → ____ P4 + ____ O2
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8.
____ C7H6O2 + ____ O2→ ____ CO2 + ____ H2O
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9.
____ Al(OH)3 + ____ H2SO4 → ____ Al2(SO4)3 + ____ H2O ________________________________
10.
____ C7H16 + ____ O2 → ____ CO2 + ____ H2O
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11.
____ K + ____ Br → ____ KBr
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12.
____ Fe2O3 + ____ H2 → ____ Fe + ____ H2O
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13.
____ C4H10 + ____ O2→ ____ CO2 + ____ H2O
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14.
____ BaCO3 → ____ BaO + ____ CO2
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15.
____ CuBr2 + ____ AlCl3 → ____ CuCl2 + ____AlBr3
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CHALLENGE - Write the formulas and balance
16.
Dicarbon dihydride + Oxygen gas → Carbon dioxide + Water
17.
Lithium oxide + Water → Lithium hydroxide
18.
Iron (III) chloride + Ammonium hydroxide → Iron (III) hydroxide + Ammonium chloride
19.
Lead (II) nitrate → Lead (II) oxide + Nitrogen dioxide + Oxygen gas
20.
Aluminum + Hydrogen chloride → Aluminum chloride + Hydrogen gas