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,m//?@7f~//30F3/,77/Balancing Equations Exercises
CSCOPE Unit 07 Lesson 01 Day 2
Vocabulary
Balanced equation uses equation symbols and chemical formulas to
describe the substances that react in a chemical reaction
(reactants ) and the products that are formed (products), along with their states, where coefficients are used to equalize numbers of each atom on each side of the reactionCoefficientsnormal-sized whole numbers in front of chemical formulas, represent the number of representative particles (atoms, molecules, or formula units) of the substance in the reactionProducta substance formed in a chemical reactionReactanta starting substance in a chemical reactionSubscriptssmall-sized numbers to the lower right of chemical symbols, represent the number of atoms of each element in the representative particle (atom, molecule, or formula unit) of the substance
Balancing chemical equations
1. A chemical equation is a model of a real-world rearrangement of atoms.
2. This leads to two absolute rules:
a. There MUST be the same number and same kinds of atoms before
and after.
b. The formulas CANNOT be altered in any way.
3. Balancing an equation is simply making sure that in our model (chemical
equation) of the real-world, no atoms are created, no atoms are destroyed,
and no formulas are changed.
4. There are two types of numbers found in chemical equations:
a. Subscripts
Small-sized numbers to the lower right of chemical symbols
Represent the number of atoms of each element in the representative particle (atom, molecule, or formula unit) of the substance
b. Coefficients
Normal-sized WHOLE NUMBERS in front of chemical formulas
Represent the number of representative particles (atoms, molecules, or formula units) of the substance in the reaction
5. Equations may be balanced by adjusting coefficients NEVER by changing
subscripts.
6. Guidelines for balancing equations
a. Start with the element that appears in the fewest number of different
representative particles on each side of the equation.
b. Balance the simplest substance last.
c. A polyatomic ion appearing unchanged on both sides of the equation
can be treated as a single unit.
d. When there is an ODD number of atoms of one kind on one side and
an EVEN number of the SAME atom on the other, it may be helpful to
START by putting a coefficient of 2 in front of the particles containing
the odd number of that atom. You may need to make more
adjustments later.
e. When oxygen gas (or other diatomic elements) appears in a reaction, a
TEMPORARY fractional coefficient may prove useful. IF you use a
temporary fractional coefficient, dont forget to multiply through by
two when everything balances.
01. How many atoms of each element are in Cr2O3?
number of chromium atoms:
number of oxygen atoms:
02. How many atoms of each element are in C6H12O6?
number of carbon atoms:
number of hydrogen atoms:
number of oxygen atoms:
03. How many atoms of each element, or polyatomic ions, are in (NH4)2CO3?
number of ammonium ions:
number of carbon atoms:
number of oxygen atoms:
04. How many atoms of each element, or polyatomic ions, are in Fe(C2H3O2)3?
number of iron atoms:
number of acetate ions:
05. A student was asked to balance the following equation:
Ca + O2 ( CaO
He wrote:
Ca + O2 ( Ca2O
How can you immediately tell that that he has done his balancing incorrectly?06. A student was asked to balance the following equation:
Na + O2 ( Na2O
She wrote:
Na + O2 ( NaO2
How can you immediately tell that that she has done her balancing incorrectly?07. A student was asked to balance the following equation:
Ag + S ( Ag2S
He wrote:
Ag2 + S ( Ag2S
How can you immediately tell that that he has done his balancing incorrectly?
08. A student was asked to balance the following equation:
Cl2 + KI ( KCl + I2
She wrote:
Cl2 + KI ( 2 KCl + I2
How can you immediately tell that that she has done her balancing incorrectly?09. A student was asked to balance the following equation:
Fe + H2O ( Fe3O4 + H2
He wrote:
3 Fe + 2 H2O ( Fe3O4 + 2 H2
How can you immediately tell that that he has done his balancing incorrectly?10. A student was asked to balance the following equation:
C2H6 + O2 ( CO2 + H2O
She wrote:
C2H6 + EMBED Equation.3 O2 ( 2 CO2 + 3 H2O
How can you immediately tell that that she has done her balancing incorrectly?
Balance each of the following equations:
1) _____ Cu + _____ O2 ( _____ Cu2O
The coefficients of the balanced equation would be: _____, _____, _____
2) _____ Al + _____ NiSO4 ( _____ Al2(SO4)3 + _____ Ni
The coefficients of the balanced equation would be: _____, _____, _____, _____
3) _____ CH4 + _____ O2 ( _____ CO2 + _____ H2O
The coefficients of the balanced equation would be: _____, _____, _____, _____
4) _____ NaI + _____ Pb(NO3)2 ( _____ PbI2 + _____ NaNO3
The coefficients of the balanced equation would be: _____, _____, _____, _____
5) _____ Ag + _____ O2 ( _____ Ag2O
The coefficients of the balanced equation would be: _____, _____, _____
6) _____ C2H8 + _____ O2 ( _____ CO2 + _____ H2O
The coefficients of the balanced equation would be: _____, _____, _____, _____
7) _____ KNO3 ( _____ KNO2 + _____ O2
The coefficients of the balanced equation would be: _____, _____, _____, _____
8) _____ AgNO3 + _____ CuCl2 ( _____ AgCl + _____ Cu(NO3)2
The coefficients of the balanced equation would be: _____, _____, _____, _____
9) _____ Br2 + _____ KI ( _____ KBr + _____ I2
The coefficients of the balanced equation would be: _____, _____, _____, _____
10) _____ AgNO3 + _____ Cu ( _____ Cu(NO3)2 + _____ Ag
The coefficients of the balanced equation would be: _____, _____, _____, _____
11) _____ MgCO3 ( _____ MgO + _____ CO2
The coefficients of the balanced equation would be: _____, _____, _____
12) _____ K2CO3 ( _____ K2O + _____ CO2
The coefficients of the balanced equation would be: _____, _____, _____
13) _____ HCl +_____ NaNO2(_____ HNO2 + _____ NaCl
The coefficients of the balanced equation would be: _____, _____, _____, _____
14) _____ Ca + _____ AlCl3 ( _____ CaCl2 + _____ Al
The coefficients of the balanced equation would be: _____, _____, _____, _____
15) _____ Mg + _____ H3PO4 ( _____ Mg3(PO4)2 + _____ H2
The coefficients of the balanced equation would be: _____, _____, _____, _____
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