1. Chapter 11 Chemical Reactions 11.2 Types of Chemical Reactions
11.1 Describing Chemical Reactions
11.2 Types of Chemical Reactions
11.3 Reactions in Aqueous Solution
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2. Classifying Reactions
Do Now:
Balance these chemical equations.
___ C2H4 + ___ O2 → ___ CO2 + ___ H2O
___ Ni + ___ H2SO4 → ___ H2 + ___ Ni2(SO4)3
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3. Classifying Reactions
Do Now:
Balance these chemical equations.
1 C2H4 + 3 O2 → 2 CO2 + 2 H2O
2. 2 Ni + 3 H2SO4 → 3 H2 + 1 Ni2(SO4)3
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4. 5 Types of Chemical Reactions Combination Decomposition
Classifying Reactions
5 Types of Chemical Reactions
Combination
Decomposition
Single-replacement
Double-replacement
Combustion.
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5. A + B AB Combination Reactions
Classifying Reactions
Combination Reactions
Two or more substances react to form a single new substance.
A + B AB +
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6. A + B AB 2 Mg + O2 2 MgO Combination Reactions
Classifying Reactions
Combination Reactions
Two or more substances react to form a single new substance.
A + B AB
2 Mg + O MgO
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7. Combination Reactions 2K + Cl2 → 2KCl S + O2 → SO2 2SO3 Fe + S → FeS
Classifying Reactions
Combination Reactions
2K + Cl2 → 2KCl
S + O2 → SO2
2SO3
Fe + S → FeS
2Fe + 3S → Fe2S3
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8. Combination Reactions 2K + Cl2 → 2KCl S + O2 → SO2
Classifying Reactions
Combination Reactions
2K + Cl2 → 2KCl
S + O2 → SO2
Fe + S → FeS
2Fe + 3S → Fe2S3
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9. AB A + B + Decomposition Reactions
Classifying Reactions
Decomposition Reactions
A single compound breaks down into two or more products.
AB A + B +
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10. AB A + B 2 BaO 2Ba + O2 Decomposition Reactions
Classifying Reactions
Decomposition Reactions
A single compound breaks down into two or more products.
AB A + B
2 BaO Ba + O2
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11. Writing Equations for Combination and Decomposition Reactions
Sample Problem 11.4
Writing Equations for Combination and Decomposition Reactions
Write a balanced equation for:
Combination of copper and sulfur: Cu + S → (two reactions possible)
Decomposition of water: H2O
electricity
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12. For Copper(I): 2Cu + S → Cu2S For Copper(II): Cu + S → CuS
Sample Problem 11.4
For Copper(I): 2Cu + S → Cu2S
For Copper(II): Cu + S → CuS
b. 2H2O(l) H2(g) + O2(g)
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13. AB + C AC + B AB + C C B + A + + Single Replacement Reactions
Classifying Reactions
Single Replacement Reactions
One element replaces a second element in a compound (based on activity series).
AB + C AC + B
AB + C C B + A
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14. AB + C AC + B AB + C C B + A MgCl2 + 2Na Mg + 2NaCl
Classifying Reactions
Single Replacement Reactions
One element replaces a second element in a compound (based on activity series).
AB + C AC + B
AB + C C B + A
MgCl2 + 2Na Mg + 2NaCl
2HCl + F HF + Cl2
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15. Activity Series of Metals
Classifying Reactions
Single-Replacement Reactions
Activity Series of Metals
Name
Symbol
Lithium Li
Calcium Ca
Sodium Na
Magnesium Mg
Aluminum Al
Zinc Zn
Iron Fe
Lead Pb
Copper Cu
Mercury Hg
Silver Ag
Decreasing reactivity
The activity series of metals lists metals in order of decreasing reactivity.
A reactive metal will replace any metal listed below it in the activity series.
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16. Single-Replacement Reactions
Classifying Reactions
Single-Replacement Reactions
Halogens can replace less reactive halogens.
The activity of halogens decreases as you go down Group 7A.
Bromine is more active than iodine, so this rxn occurs:
Br2(aq) + 2NaI(aq) → 2NaBr(aq) + I2(aq)
Bromine is less active than chlorine,so this rxn does not occur:
Br2(aq) + NaCl(aq) → No reaction
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17. AB + CD AD + CB + + Double-Replacement Reactions
Classifying Reactions
Double-Replacement Reactions
Reactant cations exchange places to form new compounds.
AB + CD AD + CB
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18. AB + CD AD + CB Double-Replacement Reactions
Classifying Reactions
Double-Replacement Reactions
Reactant cations exchange places to form new compounds.
AB + CD AD + CB
MgSO4 + K2CO K2SO4 + MgCO3
MgCl2 + 2HNO Mg(NO3)2 + 2HCl
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19. Classifying Reactions
Combustion Reactions
A hydrocarbon reacts with oxygen to produce carbon dioxide, water, and energy (in the form of heat and light).
CxHy + O CO2 + H2O
2C8H O2 → 16CO2 + 18H2O
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20. END OF 11.2
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21. https://www. youtube. com/watch. v=tE4668aarck http://ed. ted

22. Symbols Used in Chemical Equations
Interpret Data
Symbols Used in Chemical Equations
Symbol
Explanation +
Separates two reactants or two products →
“Yields,” separates reactants from products
Use in place of → for reversible reactions
(s), (l), (g)
Designates a reactant or product in the solid state, liquid state, or gaseous state; placed after the formula
(aq)
Designates an aqueous solution; the substance is dissolved in water; placed after the formula
Indicates that heat is supplied to the reaction
A formula written above or below the yields sign indicates its use as a catalyst (in this example, platinum). Δ
heat Pt