1. Chapter 11 Chemical Reactions
Activities and resources
Lab –chemical reactions
Workshops
TB & Workbooks
Animations and games for balancing equations and types of reactions:
mistry/chemBalancer/ques5.htm
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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

2. Writing Chemical Equations
11.1
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

3. Writing Chemical Equations
11.1
Writing Chemical Equations
Methane + Oxygen  Carbon dioxide + Water
(the reaction between methane and oxygen can be described as a combustion reaction.)
Three common chemical reactions are shown. a) When methane gas burns, it combines with oxygen to form carbon dioxide and water. b) Iron turns to red-brown rust (iron(III) oxide) in the presence of oxygen in the air. c) Hydrogen peroxide decomposes to water and oxygen when used as an antiseptic.

4. Writing Chemical Equations
11.1
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)
Three common chemical reactions are shown. a) When methane gas burns, it combines with oxygen to form carbon dioxide and water. b) Iron turns to red-brown rust (iron(III) oxide) in the presence of oxygen in the air. c) Hydrogen peroxide decomposes to water and oxygen when used as an antiseptic.

5. Writing Chemical Equations
11.1
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).

6. Writing Chemical Equations
11.1
Writing Chemical Equations

7. Writing Chemical Equations
11.1
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?

8. Writing Chemical Equations
11.1
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
Hydrogen peroxide decomposes to form water and oxygen gas. a) Bubbles of oxygen appear slowly as decomposition proceeds. b) With the addition of the catalyst manganese(IV) oxide (MnO2), decomposition speeds up. The white “smoke” is condensed water vapor.

12. for Conceptual Problem 11.1

13. Balancing Chemical Equations
11.1
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.

14. Balancing Chemical Equations
11.1
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.

19. Go to following website for balancing chemical equation game:
Complete worksheet (class handout) and turn in for grading

20. for Conceptual Problem 11.2

25. for Conceptual Problem 11.2

26. 11.1 Section Quiz.
11.1.

27. 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.
propane + carbon dioxide  water + oxygen
propane + oxygen + water  carbon dioxide
propane + oxygen + water + carbon dioxide
propane + oxygen  water + carbon dioxide

28. 11.1 Section Quiz.
2. Which of the following is a skeleton equation?
H2 + CO  CH3OH
2H2 + CO  CH3OH
2H2 + CO2  CH3OH
hydrogen + carbon monoxide  methanol

29. 11.1 Section Quiz.
3. What coefficient for H2SO4 is required to balance the following equation?
Ca3(PO4)2 + ____ H2SO4  3CaSO4 + 2H3PO4 1 2 3 4