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Chapter 6: Chemical Reactions
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Classify chemical reactions.
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A synthesis reaction is a reaction in which two or more substances react to produce a single product.
When two elements react, the reaction is always a synthesis reaction.
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Two compounds can also react to create one compound in a synthesis reaction.
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All synthesis reactions follow this general equation:
A + B AB
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A decomposition reaction is one in which a single compound breaks down into two or more elements or new compounds.
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Decomposition reactions often require an energy source, such as heat, light, or electricity, to occur.
Decomposition reactions follow this general equation:
AB A + B
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In a single-displacement reaction, one element displaces another in a compound.
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Usually a metal will replace another metal, or a halogen will replace another halogen in single displacement reactions
Single displacement reactions follow this general equation:
A + BC AC + B
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Double displacement reactions occur when ions exchange between two compounds.
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Double displacement reactions will always produce either a precipitate, water, or a gas.
A double-displacement reaction follows the general form
AB + CD AD + BC
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Classify the following reactions:
Na2O(s) + H2O(l) ⟶ 2 NaOH(aq)
Ba(NO3)2(aq) + K2SO4(aq) ⟶ BaSO4(s) + 2 KNO3(aq)
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2 Al(s) + Fe2O3(s) ⟶ Al2O3(s) + 2 Fe(l)
2 H2O2(aq) ⟶ 2 H2O(l) + O2(g)
Solid calcium reacts with chlorine gas to produce solid calcium chloride.
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Write a balanced chemical equation for each synthesis reaction:
Ag(s) + Br2(g)
Mg(s) + Cl2(g)
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Write a balanced chemical equation for each decomposition reaction:
Al2O3(s)
H2O(l)