Balancing Equations Worksheet 1) ___ H3PO4 + ___ KOH ? ___ K3PO4 + ___ H2O 2) ___ K + ___ B2O3 ? ___ K2O + ___ B
To balance the chemical equation, you must add COEFFICIENTS in front of the chemical formulas in the equation You cannot ADD or CHANGE subscripts Mg + O2 ?
For each of the following problems, write complete chemical equations to describe the chemical process taking place Balance the equations
Balancing Equations Worksheet and Key 1 Answer the following questions about the chemical equation shown below: 2 H2 + O2 ? 2 H2O
Date: Balancing Equations About Chemistry http://chemistry about com Balance the following chemical equations 1 2 Fe + 3 H2S04 1 Fe2(SO4)3
Chemistry 11 Unit 6 Chemical Reactions WS6-2 Word Equations doc 1 Worksheet 6 2 Word Equations 1 Write the chemical equations and balance each of the
This worksheet includes some rules and guidelines to help you balance chemical equations Rules 1 ) The formulas of the reactants and products cannot be
Chemistry Date _____ Balancing Equations Practice Worksheet Balance the following equations: 1) ___ NaNO3 + ___ PbO ? ___ Pb(NO3)2 + ___ Na2O
Balancing Equations Worksheet I Balance the following chemical equations 1 2 K + 2 H2O ? 2 KOH + H2 2 3 MnO2 + 4 Al ? 3 Mn + 2 Al2O3 3 2 Al2O3
This example illustrates the fundamental aspects of any chemical equation: 1 The substances undergoing reaction are called reactants, and their formulas
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T. Trimpe 2006 http://sciencespot.net/
Name __________________________ Atoms are not _______________ or _____________ during a chemical reaction. Scientists know that there must be the ___________ number of atoms on each ___________ of the ____________. To balance the chemical equation, you must add _______________ in front of the chemical formulas in the equation. You cannot _______ or ___________ subscripts! Mg + O
2 MgO
Try these:
Ca + O
2 CaO
Ca = Ca = O = O = N
2 + H2 NH3
N = N = H = H = Cu
2O + C Cu + CO2
Cu = Cu = O = O = C = C = H
2O2 H2O + O2
H = H = O = O =
1) Determine number of atoms for each
element.
2) Pick an element that is not equal on
both sides of the equation.
3) Add a coefficient in front of the
formula with that element and adjust your counts.
4) Continue adding coefficients to get the
same number of atoms of each element on each side.
Mg =
O =
Mg =
O =
T. Trimpe 2006 http://sciencespot.net/
Balancing Act Practice Name ____________________________ Balance each equation. Be sure to show your lists! Remember you cannot add subscripts or place coefficients in the middle of a chemical formula.
1. Na + MgF
2 NaF + Mg
2. Mg + HCl
MgCl2 + H2
3. Cl
2 + KI KCl + I2
4. NaCl
Na + Cl2
5. Na + O
2 Na2O
6. Na + HCl
H2 + NaCl
7. K + Cl
2 KCl
Challenge: This one is tough!
C
2H6 + O2 CO2 + H2O
T. Trimpe 2006 http://sciencespot.net/
Overhead Key Atoms are not CREATED or DESTROYED during a chemical reaction. Scientists know that there must be the SAME number of atoms on each SIDE of the EQUATION. To balance the chemical equation, you must add COEFFICIENTS in front of the chemical formulas in the equation. You cannot
ADD or CHANGE subscripts!
Mg + O2 MgO
Try these:
Ca + O
2 CaO
Ca = Ca = O = O = N
2 + H2 NH3
N = N = H = H = Cu
2O + C Cu + CO2
Cu = Cu = O = O = C = C = H
2O2 H2O + O2
H = H = O = O =
Step 1: Determine number of atoms
for each element.
Step 2: Pick an element that is not
equal on both sides of the equation.
Step 3: Add a coefficient in front of
the formula with that element and adjust your counts.
Step 4: Continue adding coefficients
to get the same number of atoms of each element on each side.
Mg =
O =
Mg =
O =
T. Trimpe 2006 http://sciencespot.net/
Step-by-Step Example Problem:
Step 1: Determine number of atoms for each element. Step 2: Pick an element that is not equal on both sides of the equation. Step 3: Add a coefficient in front of the formula with that element and adjust your counts. Step 4: Continue adding coefficients to get the same number of atoms of each element on each side.
Mg = 1
O = 2
Mg = 1
O = 1
Mg + O2 MgO
Mg = 1
O = 2
Mg = 1
O = 1
Mg + O2 MgO
Since the O atoms are not equal,
we"ll target those first! 2 Mg + O2 2 MgO
Mg = 1
O = 2
Mg = 1 2
O = 1
2 Mg + O2 2 MgO
Adding a 2 in front of MgO will
change the number of atoms on the product side of the equation.
Now we need to increase the
number of Mg atoms we have on the reactant side. Adding a 2 in front of
Mg will give us 2 atoms of Mg and
balance the equation.
Mg = 1 2
O = 2
Mg = 1 2
O = 1
2
Balancing Act
Teacher Notes
T. Trimpe 2006 http://sciencespot.net/
Balancing Act Answer Key:
Page 1 Problems
2 Ca + O
2 2 CaO
N
2 + 3 H2 2 NH3
2 Cu
2O + C 4 Cu + CO2
2 H
2O2 2 H2O + O2 Hint: Add the O atoms on the product side together when doing the counts.
Page 2 Practice Problems
1. 2 Na + MgF
2 2 NaF + Mg
2. Mg + 2 HCl
MgCl2 + H2
3. Cl
2 + 2 KI 2 KCl + I2
4. 2 NaCl
2 Na + Cl2
5. 4 Na + O
2 2 Na2O
6. 2 Na + 2 HCl
H2 + 2 NaCl
7. 2 K + Cl
2 2 KCl
Challenge: This one is tough!
2 C
2H6 + 7 O2 4 CO2 + 6 H2O