Download chemical*equations

“Success'is'not',inal,'failure'
is'not'fatal:'it'is'the'courage'
to'continue'that'counts.”
''7Winston'Churchill
CHEMICAL*EQUATIONS
When'a'chemical'reaction'occurs,'atoms'rearrange'to'form'new'
compounds,'but'no'new'atoms'are'created'nor'are'any'destroyed.'This'
concept'is'called'conservation'of'mass.'Mass'conservation'can'be'seen'in'a'
balanced'chemical'equation,'where'the'numbers'of'each'kind'of'atom'are'
the'same'on'both'sides'of'the'reaction'arrow.
CHEMISTRY*1210
Dr. Matthew W. Stoltzfus
“Dr. Fus”
@Dr_Fus
The Ohio State University
Lecture #5 Thursday, September 6th
QUIZ*#2
First*5*minutes*of*RecitaDon
Wed.,*Sept.*12th
*Fri.,*Sept.*14th
Mon.,*Sept.*17th
*
BALANCING*CHEMICAL*EQUATIONS
CHEMICAL*EQUATIONS
Mg(s)'+'CO2(s)
?
WHAT*WILL*HAPPEN*
WHEN*MAGNESIUM*
SHAVINGS*ARE*IGNITED*
WITH*A*PROPANE*TORCH*
IN*THE*PRESENCE*OF*CO2?*
CHEMICAL*EQUATIONS
CHEMISTRY*IS*AN*
EXPERIMENTAL*SCIENCE*
WHERE*MEASUREMENTS*
ARE*MADE.*
Mg(s)'+'CO2(s)
?
CHEMICAL*EQUATIONS
Mg(s)'+'CO2(s)
CHEMICAL*EQUATIONS
MgO(s)'+'C(s)
When'a'chemical'reaction'occurs,'
atoms'rearrange'to'form'new'
compounds,'but'no'new'atoms'are'
created'nor'are'any'destroyed.'This'
concept'is'called'conservation'of'
mass.'Mass'conservation'can'be'
seen'in'a'balanced'chemical'
equation,'where'the'numbers'of'
each'kind'of'atom'are'the'same'on'
both'sides'of'the'reaction'arrow.
4 Mg(s)'+'''''CO
2 2(s)
REACTANTS
4 MgO(s)'+'''''''C(s)
2
PRODUCTS
CHEMICAL*EQUATIONS
2 Mg(s)'+'''''CO
1
4
2 2(s)
REACTANTS
2
1
4 MgO(s)'+'''''''C(s)
2
PRODUCTS
DESCRIBE*IN*WORDS*THE*
CHEMICAL*REACTION*ON*
THE*CENTER*SCREEN.**
CHEMICAL*REACTIONS
BALANCING*CHEMICAL*EQUATIONS
Consider'the'reaction'between'nitrogen'(N2)'and'
oxygen'(O2)'to'produce'nitrogen'dioxide.'
What'
molecules'will'
be'present'in'
this'box?
(a)'8'NO2'molecules
(b)'6'NO2'molecules
(c)'8'NO2'molecules'+'1'O2'molecule
(d)'6'NO2'molecules'+'1'N2'molecule Problem'3.4
BALANCING*CHEMICAL*EQUATIONS
What'is'the'sum'of'the'whole'number'coef,icients'
of'the'reactants'and'products'for:
NH3*+*O2******************NO*+*H20*
(a)'12
(b)'15
(c)'19
(d)'20
(e)'22
Problem'3.11
BALANCING*CHEMICAL*EQUATIONS
What'is'the'sum'of'the'whole'number'coef,icients'of'the'
reactants'and'products'for:
What'is'the'sum'of'the'whole'number'coef,icients'
of'the'reactants'and'products'for:
Fe3Br8*+*sodium*carbonate*************sodium*bromide*+*carbon*dioxide*+*Fe3O4*
iron(III)*nitrate*+*ammonia*+*water
***************************iron(III)*hydroxide*+*ammonium*nitrate*
(a)'7
(b)'11
(c)'22
(d)'5
(e)'9
(a)'12
(b)'13
(c)'15
(d)'16
(e)'18
Problem'3.12
Problem'3.13
CHEMICAL*EQUATIONS
CH4(g)'+'''''O
2 2(g)
COMBUSTION*
REACTION
DEMO*
CO2(g)'+''''''H
2 2O(g)
BALANCING*CHEMICAL*EQUATIONS
Which'of'the'following'is'the'balanced'chemical'
equation'for'the'combustion'of'propanol'(C3H7OH)?
(a)'C3H7OH(l)'+'9'O(g)'''''''''''''''3'CO2(g)'+'4'H2O(l)'
(b)'C3H7OH(l)''''''''''''''''3'CO2(g)'+'4'H2O(l)
(c)'C3H7OH(l)'''''''''''''''3'CO(g)'+'4'H2(g)'+'2'C(s)
(d)'2'C3H7OH(l)'+'9'O2(g)''''''''''''''6'CO2(g)'+'8'H2O(l)
(e)'C3H7OH(l)'+'5'O2(g)'''''''''''''''3'CO2(g)'+'4'H2O(l)
Problem'3.19
HYDROGEN]OXYGEN*
BALLON
DEMO*
CHEMICAL*REACTIONS
Hydrogen'and'Oxygen'react'vigorously'to'form'water.'If'
275'hydrogen'molecules'are'reacted'with'125'oxygen'
molecules'in'a'closed'container,'how'many'hydrogen,'
oxygen,'and'water'molecules'will'remain'after'the'
reaction'is'complete?'
(a)'150'hydrogen'+'0'Oxygen'+'125'water'
(b)'0'hydrogen'+'25'oxygen'+'275'water
(c)'0'hydrogen'+'25'oxygen'+'250'water
(d)'0'hydrogen'+'0'oxygen'+'250'water
(e)'25'hydrogen'+'0'oxygen'+'250'water
Problem'3.6