Post on 20-Jan-2016
Chapter 11 Chemical Reactions
• Writing Chemical equations
• Balancing Equations
• Classifying reactions
• Predicting the products
• Reactions in aqueous solutions (complete and net ionic equations)
• Predicting the formation of a precipitate
Activities and resources
Lab –chemical reactions
Workshops
TB & Workbooks
Animations and games for balancing equations and types of reactions:
http://funbasedlearning.com/chemistry/chemBalancer/ques5.htm
http://www.youtube.com/watch?v=i-HHvx1VC_8&NR=1
http://www.youtube.com/watch?v=tE4668aarck&feature=related
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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
11.1
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Describing Chemical Reactions
> Writing Chemical Equations
Methane + Oxygen Carbon dioxide + Water
(the reaction between methane and oxygen can be described as a combustion reaction.)
11.1
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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)
11.1
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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).
11.1
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Describing Chemical Reactions
> Writing Chemical Equations11.1
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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?
11.1
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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
11.1
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Practice Problems for Conceptual Problem 11.1
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Describing Chemical Reactions
>
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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 of mass.
11.1
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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.
11.1
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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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Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section 11.1.
11.1 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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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
11.1 Section Quiz.
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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
11.1 Section Quiz.