Notesale: Turn your study into money

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Republic of the Philippines
Department of Education
Region 02
Division of Cagayan
VICENTE D
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Calonia, Jr
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E ri h e t Card………………………………………………
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As we begin this battle I would like to point
out a few very basic bits of information
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Good Day, Clash of Scientists!
A very important aspect of this lesson is for you to learn how to
balance equations
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You may have had previous experience with this and only need review
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I will show you how to balance some
equations and work through several examples and then have you take
the time to get a lot of practice
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Making sure they are balanced must be
done before the equation can be used in any chemically meaningful
way
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Boosting your skills and
abilities with the innovative techniques in balancing chemical equations
will make you fully understand how a certain amount of
reacAre you ready now? Ahu! Ahu! Let’s attack!

This secret mission contains the
following activities:
Activity 1: Balance Defense Strategy
This activity is created to elucidate that when you write an equation for a chemical reaction, the two
sides of the equation should be balanced
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” This means that you have neither gained nor lost any atoms during the reaction
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This activity is presented in a form of virtual strips that will make the students enjoy and have fun on it!
Activity 2: Games of Thrones: Balance the See-Saw!
This activity explains how to balance chemical equation using coefficients
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It also explains the importance of balancing chemical equations and
describes what happens in a chemical reaction
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Your task here is to be able to identify the exact number of atoms in an unbalance chemical equation
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This is the concept of trial and error method
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This part is very interesting because you will discover your own way of
finding the correct coefficient by all means
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With lots
of number war, it will make your life balance
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This identify the elements on the reactant and product side
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You should be able to
choose an element that is not balanced and begin to balance the chemical equation
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Activity 1: Balance Defense Strategy
Directions: Carefully read the balance defense strategy and
answer the guide questions that follows
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The law of conservation
of mass states that mass can
neither be created nor destroyed
in a chemical reaction
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I will create
mass
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Ohh o! No e tra ass
should e allo ed
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Take ote
udd

Guide Questions:
1
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What happens if there is an unequal number of soldiers on both
side of the rope?
_______________________________________________________
_______________________________________________________
3
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What will happened if there is an addition of mass and deduction of
mass in the battlefield?

Good job buddy! I’m sure you're ready for
the next battle
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I a he i al ea io , the u e of ato s
o oth sides should e the sa e
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You a ot ha ge the
su s ipts
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Based on the games of see-saw, how do we balance the both side of the
chemical equations?
____________________________________________________________
____________________________________________________________
2
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What is the difference between “coefficients” and “subscripts”
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Which are the reactants and products in the chemical equation below?
3H2+N2

2NH3

Reactants: ____________________________
Products: _____________________________

A azi g gu s! You’ e a he o!
Co e o , let’s p o eed to the
e t atle a p! Get ead
...

Directions: Complete the given table with the correct number of atoms of
each element and write the balance chemical equation below
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NaOH + H SO —————> Na SO + H O
Element

Reactants (Number of atoms)

Products (Number of atoms)

Na
O
H
S
Bala e

e!

__NaOH + H SO —————> Na SO + __H O

Fantastic! You have unlocked some of the special weapons and tactics in balancing chemical
equation
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Let’s

Activity 4: It's Number War - Balancing Act!
Welcome to It's Number War - Balancing Act! The leader of the troop will give
you a number of incomplete chemical equations
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Once you think the
equation is balanced, release the missile!' button
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__NaCl + __F --> __NaF + __Cl

B
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__C H + __O ---> __CO + __H O

Activity 5: Map it: Balance the Chemical Equations
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Identify the elements on the reactant and product side
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Count the number of atoms for each element
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Are the two sides equal? If not, the equation is not balanced
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The numbers in the map are your coefficients
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5
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6
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7
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8
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9
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Make the following Equations
on your secret map to find the
enemies

Reactants
(Include the number of
atoms for each
element)

Products
(Include the
number of
atoms for
each element)

P4 + O2 ——> P4O10
Fe + H2O ——> Fe3O4 + H2
C + H2 ——> CH4
Na2SO4 + CaCl2 ——>
CaSO4 + NaCl

Congratulations! You’ve made it! Now you have
completed all levels of your mission
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An equation is balanced by
a
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erasing elements as necessary

b
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adding elements as necessary

2
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zinc and copper
b
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zinc and copper (II) sulfate
d
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What are the products in the above equation?
a
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zinc and copper (II) sulfate

b
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only zinc

4
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6

c
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3

d
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Q: What is the balanced equation for: ___ SnO2 + ___ H2 → ___ Sn + ___ H2O?
a
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SnO2 + H2 → Sn + 2 H2O

c
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2 SnO2 + H2 → 2Sn +

Activity 1
1
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Their will be an unequal distributions of their mass on both sides
3
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There will be an unequal mass on both sides of the chemical equation
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Count the atoms of each element in the reactants and the products
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2
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Just like we want the see-saw to be balanced on both sides, a chemical equation should also be balanced on both sides
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3
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In a chemical equation, a subscript cannot be
changed
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Reactants: Hydrogen (H2) and Nitrogen (N2)
Products: Ammonia (NH3)
Activity 3
Elements
Na
O
H
S

Reactants (Number of atoms)
1
5
3
1

Products (Number of atoms)
2
5
2
1

2NaOH + H2SO4—————> Na2SO4 + 2H2O
Activity 4
A
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Zn + 2HCl ---> ZnCl2 + H2
C
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A price for you’re success
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#Throwback
Chemical equations show the formulas for the substances that take part in the
reaction
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The formulas on the right side of the arrow represent the products, the substances that are
formed in the reaction
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The arrow separating the reactants from the products
can be read as “ goes to” or “yields” or “produces
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– These numbers are called coefficients
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If a formula in a balanced equation has no stated coefficient, its coefficient is understood to be 1
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The law was discovered by Antoine Laurent Lavoisier (1743-94) and this is his formulation of it, translated into English in
1790 from the Traité élémentaire de Chimie (which was published in 1789):
A less wordy way to say it might be:
"Matter is
neither cre- Points to Ponder:
ated
nor
Remember once you practice you may find your own way through disdestroyed
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There is always more than one approach
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If you have found your own way of finding
the correct coefficient by all means do what comes natural
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In order to balance you have to
find the amount of each atom and always balance the compounds with more

Here are the rules to follow when balancing chemical equations:
1
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2
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Keep your eye out for diatomic molecules such as oxygen, hydrogen, and the halogens
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If you get stuck, double the most complicated-looking group and try again
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Finally, make sure that all coefficients are in the lowest-possible ratio
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Know when to quit! None of the reactions you will encounter will be that difficult
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6
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Below are bunch of chemical equations
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Put them to
KClO3 ---> KCl + O2
4Fe + 3O2 ---> 2Fe2O3
2C2H6 + 7O2 ---> 4CO2 + 6H2O
C5H12 + O2 ---> CO2 + H2O
Ca(OH)2 + H3PO4 ---> Ca3(PO4)2 + H2O
Al2(CO3)3 + H3PO4 ---> AlPO4 + CO2 + H2O
3 CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl

BALANCED CHEMICAL EQUATIONS

UNBALANCED CHEMICAL EQUATIONS



Myers, Richard (2009)
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Greenwood Publishing Group,
p
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

Meyer, H
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Modern Inorganic Chemistry , (3rd ed
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171
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a d Julio de Paula



Wi e g, Ego , Wi e g, Nils a d Holle a , A old F ede i k
Che istr
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, pp
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I orga i Che istr , th Ediio , p
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Lechner, Manfred; Gehrke, Klaus; Nordmeier, Eckhard (2003)
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, Basel: Birkhauser, pp
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

Smart and Moore ( 2010)
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56
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Ge eral Che istr
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, p
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The Development of Modern Chemistry
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Che istr , th Ed
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p
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p
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