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Chemical Reactions
Students will be able to
- List and observe the signs of a chemical reaction.
- Write a chemical equation from a description of a reaction.
- Identify the type of reaction given an example.
What is a chemical reaction? What do you picture when you hear the term “chemical reaction?”
Demonstrations
Demo #1 – Burning ethyl alcohol
Evidence of a Chemical
Reaction
Chemical Equation
Demo #2 – Cabbage Juice Indicator with Acid/Base
Evidence of a Chemical
Reaction
Chemical Equation
N/A
Demo #3 – Copper in Nitric Acid (Oxidation/Reduction)
Evidence of a Chemical
Reaction
Chemical Equation
Demo #4 – Lead Nitrate and Potassium Iodide Solutions (Precipitation)
Evidence of a Chemical
Reaction
Chemical Equation
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Signs of a Chemical Reaction
1)
2)
3)
4)
Reactants
Products
States:
Diatomic elements:
Types of Chemical Reactions
Set A ______________________
4Fe(s) + 3O2(g) 2Fe2O3(s)
N2(g) + 3H2(g) 2NH3(g)
2SO2(g) + O2(g) 2SO3(g)
What do you notice about all of the reactions in Set A?
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MgO(s)+ H2O(l) Mg(OH)2(aq)
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P2O5(g) + 3H2O(l) 2H3PO4(aq)
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SO3(g) + H2O(l) H2SO4(aq)
Set B ______________________
What do you notice about all of the reactions in Set B?
MgCO3(s) MgO(s) + CO2(g)
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8Li2S(s) 16Li(s) + S8(s)
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2H2O(l) 2H2(g) + O2(g)
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2KClO3(s) 2KCl(s) + 3O2(g)
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2Na2O2(s) 2Na2O(s) + O2(g)
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(NH4)2CO3(s) 2NH3(g) + H2O(l) + CO2(g)
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Set C _________________________
2FeCl3(aq) + 3Zn(s) 2Fe(s) + 3ZnCl2(aq)
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What do you notice about all of the reactions in Set C?
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Mg(s) + CuSO4(aq) MgSO4(aq) + Cu(s)
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2Al(s) + 6HCl(aq) 2AlCl (aq) + 3H (g)
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Cl2(g) + 2NaBr(aq) 2NaCl(aq) + Br2(l)
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ZnBr2(aq) + F2(g) ZnF2(aq) + Br2(l)
2Al(NO3)3(aq) + 3Ca(s) 3Ca(NO3)2(aq) +
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2Al(s)
Set D _________________________
AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq)
2HNO3(aq) + Mg(OH)2(aq) Mg(NO3)2(aq) + 2H2O(l)
Na2CO3(aq) + CaCl2(aq) CaCO3(s) + 2NaCl(aq)
FeS(s) + 2HCl(aq) H2S(g) + FeCl2(aq)
HCl(aq) + NaOH(aq) H2O(l) + NaCl(aq)
FeBr3(aq) + K3PO4(aq) FePO4(s) + 3KBr(aq)
Set E _________________________
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
What do you notice about all of the reactions in
Set D?
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What do you notice about all of the reactions in
Set E?
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C10H8(g) + 12O2(g) → 10CO2(g) + 4H2O(g)
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2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g)
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2CH3OH(g) + 3O2(g)  2CO2 (g) + 4H2O(g)
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Define the following reactions and then go back to each reaction set and label them.
1. Synthesis –
2. Decomposition –
3. Single Replacement –
4. Double Replacement –
5. Combustion –
Practice
What is the difference between synthesis and decomposition reactions? Use the following examples to help you
explain:
Synthesis: H2 + O2  H2O
Decomposition: NaCl  Na + Cl2
What is the difference between single and double replacement reactions? Use the following examples to help
you explain:
Single replacement: Li + Ca3(PO4)2  Li3PO4 + Ca
Double replacement: MgCl2 + NaF  NaCl + MgF2
Synthesis Reaction Writing
Write the chemical equations for the following reactions:
Hint: Don’t forget about diatomics!
a) Sodium reacts with chlorine to create sodium chloride.
b) Potassium oxide reacts with water to create potassium hydroxide (use polyatomic chart).
c) Mg + O2  _________________
d) K + P  __________________
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Decomposition Reaction Writing
Write the chemical equations for the following reactions:
a) Water decomposes into hydrogen and oxygen.
b) Sodium chloride decomposes into sodium and chlorine.
c) BaO  ___________ + ____________
d) Be3N2  ___________ + ___________
Single Replacement Reaction Writing
Write chemical equations for the following reactions.
a) Phosphorus reacts with sodium chloride to produce sodium phosphide and chlorine.
b) Aluminum (III) sulfate reacts with barium to produce barium sulfate and aluminum.
c) Mg + CuNO3  __________________ + ________
d) Na + Ca3P2  ___________________ + _________
Complete the following single replacement reactions:
a) NaCl + Ag  _________________ + _________
b) Li + Ca3(PO4)2  ________________ + ________
Double Replacement Reactions
Complete the following reactions by providing the formulas for the missing compound(s).
a) Cu(NO3)2 + ____________________  NaNO3 + CuCl2
b) ZnI2 + ___________________  ZnSO4 + AlI3
c) K2O + MgBr2  __________________ + _________________
Categorize each of the following reactions as single replacement (SR), double replacement (DR), synthesis (S),
decomposition (D) or combustion (C).
_____a) Ca + O2  CaO
_____c) C4H10 + O2  CO2 + H2O
_____b) Mg(NO3)2 + Cu  CuNO3 + Mg
_____d) Al2O3  Al + O2
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_____e) SrCl2 + F2  SrF2 + Cl2
_____f) BaF2 + Na2O  BaO + NaF
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