slide 1 of 37 chemistry. © copyright pearson prentice hall slide 2 of 37 describing chemical...
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Slide 1 of 37
chemistry
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Describing Chemical Reactions
On May 6, 1937, the huge airship Hindenburg erupted into a fireball. Within a short time, 210,000 cubic meters of hydrogen had burned and the airship was destroyed. The chemical reaction that occurred is “hydrogen combines with oxygen to produce water.” You will learn to represent this chemical reaction by a chemical equation.
11.1
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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
>
Slide 3 of 37
Writing Chemical Equations
Writing Chemical Equations
How do you write a word equation?
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© Copyright Pearson Prentice Hall
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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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Writing Chemical Equations
Methane + Oxygen Carbon dioxide + Water
11.1
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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Writing Chemical Equations
iron + oxygen iron(III) oxide
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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Writing Chemical Equations
Hydrogen Peroxide Water and Oxygen
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© Copyright Pearson Prentice Hall
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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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
>
Slide 9 of 37
Writing Chemical Equations
How do you write a skeleton equation?
11.1
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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Writing Chemical Equations
Write the formulas of the reactants to the left of the yields sign (arrow) and the formulas of the products to the right.
11.1
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© Copyright Pearson Prentice Hall
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.
Here is the equation for rusting:
Fe + O2 Fe2O3
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© Copyright Pearson Prentice Hall
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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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Writing Chemical Equations11.1
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Describing Chemical Reactions
> Writing Chemical Equations
Animation 12
Relate chemical symbols and formulas to the information they communicate.
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Slide 18 of 37
Practice Problems for Conceptual Problem 11.1
Problem Solving 11.2 Solve Problem 2 with the help of an interactive guided tutorial.
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Describing Chemical Reactions
>
Slide 19 of 37
Balancing Chemical Equations
Balancing Chemical Equations
What are the steps in writing a balanced chemical equation?
11.1
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Describing Chemical Reactions
> Balancing Chemical Equations
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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© Copyright Pearson Prentice Hall
Describing Chemical Reactions
> Balancing Chemical Equations
This is a balanced equation for making a bicycle. The numbers are called coefficients—small whole numbers that are placed in front of the formulas in an equation in order to balance it.
11.1
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© Copyright Pearson Prentice Hall
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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Slide 23 of 37
Describing Chemical Reactions
> Balancing Chemical Equations
Simulation 11
Sharpen your skills by balancing chemical equations.
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Slide 28 of 37
Practice Problems for Conceptual Problem 11.2
Problem Solving 11.4 Solve Problem 4 with the help of an interactive guided tutorial.
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Practice Problems for Conceptual Problem 11.2
Problem Solving 11.6 Solve Problem 6 with the help of an interactive guided tutorial.
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Slide 34 of 37
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.
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