Download + __ O 2

Balancing chemical equations
Balancing chemical equations
Balancing Equations
__ B4H10(g) + __ O2(g)
H2O(g)
----> __ B2O3(g) + __
1. There should be just as many of each kind of
atom on the reactant side as on the product
side
2. Start with coefficients of “1”
3. Do not change subscripts
4. Find lowest whole number coefficients
5. Find coefficients for elements last
6. “temporary” fractional coefficients are okay
Balancing Equations
__ B4H10(g) + __ O2(g) ----> __ B2O3(g) + __ H2O(g)
B
H
O
B
H
O
Balancing Equations
Fe(s)
Fe
+
O
O2 (g)
---->
Fe2O3(s)
Fe
O
Balancing Equations
__ B4H10(g) + __ O2(g)
B
H
O
----> __ B2O3(g) + __ H2O(g)
B
H
O
Write the balanced chemical equation
for the combustion of ethane (C2H6)
C2H6 + O2
C
H
O
----->
H2O + CO2
C
H
O
Write the balanced chemical equation
for the combustion of methane
CH4 + O2
C
H
O
----->
H2O + CO2
C
H
O
Write the balanced chemical equation
for the combustion of octane (C8H18)
C8H18 + O2
C
H
O
----->
H2O + CO2
C
H
O
Write the balanced chemical equation
for the combustion of butane (C4H10)
C4H10 + O2
C
H
O
----->
H2O + CO2
C
H
O
Word Equations to Formula Equations
Exercise 6.3- 6.4 notes
page 2
Part A and Part B
Word Equations to Formula Equations
A) Translate the word equations into chemical equations and balance them.
E.g. 1) Word equation: solid sodium reacts with chlorine gas to produce solid sodium chloride.
Chemical equation: ________________________________________________________
Species
Reactant Side
Product Side
Balanced?
Word Equations to Formula Equations
Exercise Workbook Page 111
Question Carbon reacts with Oxygen to
make carbon dioxide
Word Equations to Formula Equations
Carbon reacts with Oxygen to make carbon
dioxide
Word Equations to Formula Equations
THE GROUP OF SEVEN:
 There are seven atoms that exist as diatomic
molecules in nature
 They form a number 7 on the periodic table:
 Memorize them!
 H2, N2, O2, F2, Cl2, Br2, I2
H
NO F
Cl
Br
I
Word Equations to Formula Equations
Don’t forget about the diatomic elements!
(Br I N Cl H O F) For example, Oxygen is O2
as an element.
In a compound, it can’t be a diatomic element
because it’s not an element anymore, it’s a
Word Equations to Formula Equations
Exercise 6.3- 6.4 notes
page 1 and Page 2
Part A 2
Word Equations to Formula Equations
Nitrogen reacts with
aluminum to make
aluminum nitride
Word Equations to Formula Equations
N2 + 2Al  2AlN
Word Equations to Formula Equations
Hydrogen racts with
nitrogen to make
ammonia(NH3)
Word Equations to Formula Equations
Work book page 111
Question 40-48
Page 114 Question 60- 64