Chapter 11 Chemical Reactions
Activities and resources
•Writing Chemical equations
Lab –chemical reactions
•Balancing Equations
Workshops
•Classifying reactions
TB & Workbooks
•Predicting the products
Animations and games
for balancing equations
and types of reactions:
•Reactions in aqueous
solutions (complete and net
ionic equations)
•Predicting the formation of a
precipitate
http://funbasedlearning.com/che
mistry/chemBalancer/ques5.htm
http://www.youtube.com/watch?v=iHHvx1VC_8&NR=1
http://www.youtube.com/watch?v=tE
4668aarck&feature=related
11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
Word Equations
To write a word equation, write the
names of the reactants to the left of the
arrow separated by plus signs; write the
names of the products to the right of the
arrow, also separated by plus signs.
Reactant + Reactant  Product + Product
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
Methane + Oxygen  Carbon dioxide + Water
(the reaction between methane and oxygen can
be described as a combustion reaction.)
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
iron + oxygen  iron(III) oxide
(the reaction between Fe and O2 to form Fe2O3
can be described as a combination or synthesis
reaction)
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
Chemical Equations
A chemical equation is a representation of a
chemical reaction; the formulas of the reactants
(on the left) are connected by an arrow with the
formulas of the products (on the right).
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
A skeleton equation is a chemical equation
that does not indicate the relative amounts
of the reactants and products. (i.e. the
equation is not yet balanced)
Here is the equation for rusting:
Fe + O2  Fe2O3
How would you balance this equation?
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11.1
Describing Chemical
Reactions
>
Writing Chemical Equations
A catalyst is a substance that speeds up the
reaction but is not used up in the reaction.
Without Catalyst
With Catalyst
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Practice Problems for Conceptual Problem 11.1
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11.1
Describing Chemical
Reactions
>
Balancing Chemical Equations
Balancing Chemical Equations
What are the steps in writing a balanced
chemical equation?
To write a balanced chemical equation,
first write the skeleton equation. Then
use coefficients to balance the equation
so that it obeys the law of conservation
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of mass.
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11.1
Describing Chemical
Reactions
>
Balancing Chemical Equations
A chemical reaction is also described by a
balanced equation in which each side of the
equation has the same number of atoms of each
element and mass is conserved.
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Go to following website for balancing
chemical equation game:
http://funbasedlearning.com/chemistry/chemBalancer/ques5.htm
Complete worksheet (class handout) and
turn in for grading
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Practice Problems for Conceptual Problem 11.2
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Practice Problems for Conceptual Problem 11.2
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11.1 Section Quiz.
Assess students’ understanding
of the concepts in Section 11.1.
Continue to:
-or-
Launch:
Section Quiz
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11.1 Section Quiz.
1. Propane gas reacts with oxygen to produce
water vapor and carbon dioxide. Choose the
correct word equation for this reaction.
a. propane + carbon dioxide  water +
oxygen
b. propane + oxygen + water  carbon
dioxide
c. propane + oxygen + water + carbon
dioxide
d. propane + oxygen  water + carbon
dioxide
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11.1 Section Quiz.
2. Which of the following is a skeleton equation?
a. H2 + CO  CH3OH
b. 2H2 + CO  CH3OH
c. 2H2 + CO2  CH3OH
d. hydrogen + carbon monoxide  methanol
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11.1 Section Quiz.
3. What coefficient for H2SO4 is required to
balance the following equation?
Ca3(PO4)2 + ____ H2SO4  3CaSO4 + 2H3PO4
a. 1
b. 2
c. 3
d. 4
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