Chemistry Flashcards Template Page 12
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13Rules for Balancing Chemical Equations
Solid cobalt (III) oxide reacts with elemental carbon to produce cobalt and
carbon dioxide.
Write a skeletal
- You can only change the coefficients.
equation
- You can NOT add new atoms or molecules into
Balance atoms in
the equation (doesn’t apply to REDOX reactions –
complex substances
see later).
first
- You can NOT change the chemical formulas to
Balance free elements
force a balanced equation.
by adjusting coefficient
in front of free element
- Usually done by trial and error (see page 115 for
a strategy if you find this tricky at first)
If fractional coefficients,
multiply through by
denominator
Check
Chemical Reactions
Chemical Reactions
Example Questions
(g) → CO
CH
(g) +
2
O
(g) +
2
H
O(g)
4
2
2
2
Name the following compounds
CH
and O
are the reactants, and CO
and H
O
4
2
2
2
1. NiCl
a) Nitrogen iodotrichloride
3
are the products
b) Nickel chloride
the (g) after the formulas tells us the state of the
chemical
c) Nickel trichloride
the number in front of each substance tells us the
d) Nickel(III) chloride
numbers of those molecules in the reaction
called the coefficients
2. ClO
a) Chlorine dioxide
this equation is balanced, meaning that there are
2
equal numbers of atoms of each element on the
b) Chloro oxygen
reactant and product sides
c) Chloro dioxygen
to obtain the number of atoms of an element, multiply the
subscript by the coefficient
d) Chlorite
Chemical Reactions
12
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