Education • All: 3.2 Classify Chemical Equations

CLASSIFY CHEMICAL REACTIONS

1. Combination or synthesis:

$\large \fn_cm \\A\;\;\;+\;\;\;Z\;\;\;\rightarrow \;\;\;AZ \\ \\4Na\;(s)\;+\;O_{2}\;(g)\;\rightarrow 2Na_{2}O \\\\\mathbf{Product}\;=\;one\;compound$

2. Decomposition:

$\large \fn_cm \\AZ\;\;\;\rightarrow \;\;\;A\;\;\;+\;\;\;Z \\ \\2HgO\;(l)\rightarrow 2Hg\;(l)\;+\;O_{2}(g) \\\\\mathbf{Reactant}\;=\;one\;compound$

a) Carbonate:

$\large \fn_cm \\Metal\;Carbonate\overset{\bigtriangleup }{\rightarrow}\;Metal\;Oxide\;+\;CO_{2}\\ \\Na_{2}CO_{3}\;\;\;\;\;\;\;\;\;\;\;\;\;\overset{\bigtriangleup }{\rightarrow}\;\;\;\;\;\;\;2Hg\;\;\;\;\;\;\;+\;\;CO_{2}$

b )Hydrogen Carbonate:

$\large \fn_cm \\Metal\;Hydrogen\;Carbonate\overset{\bigtriangleup }{\rightarrow}\;Metal\;Carbonate\;+\;CO_{2}\;+\;H_{2}O\\ \\Ca(HCO_{3})_{2}\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\overset{\bigtriangleup }{\rightarrow}\;\;\;\;\;\;\;CaCO_{3}\;\;\;\;\;\;\;\;\;+\;CO_{2}\;+\;H_{2}O$

3. Single replacement reaction:

$\large \fn_cm \\A\;\;+\;\;BZ\;\;\;\rightarrow \;\;\;AZ\;+\;B\\\\ Cl_{2}\;\;+\;\;2NaBr\;\;\;\rightarrow \;\;\;2NaCl\;\;+\;\;Br_{2}\\\\ One\;element\;overtakes\;the\;other\;element's\;partner$

4. Double replacement reaction:

$\large \fn_cm \\AX\;\;+\;\;BZ\;\;\;\rightarrow \;\;\;AZ\;+\;BX\\\\ An\;exchange\;of\;partners$

a) Precipitation:

$\large \fn_cm \\Aq\;solution_{1}\;+\;Aq\;solution_{2}\;\rightarrow \;Precipitate\;+\;Aq\;solution_{3}\\\\ 2AgNO_{3}\;\;\;\;\;\;+\;\;\;\;Na_{2}CO_{3}\;\;\;\;\;\rightarrow \;\;\;\;\;Ag_{2}CO_{3}\;\;+\;\;\;2NaNO_{3}$

b) Neutralization:

$\large \fn_cm \\Acid\;+\;Base\;\;\;\rightarrow \;Salt\;\;\;+\;Water\\\\ HCl\;\;+\;NaOH\;\rightarrow \;NaCl\;+\;\;H_{2}O$

5. Combustion reaction:

$\large \fn_cm \\Organic\;Compound\;+\;O_{2}\;\;\;\rightarrow \;CO_{2}\;\;\;+\;H_{2}O\;+\;Energy\\\\ C_{6}H_{12}O_{6}\;\;\;+\;\;\;\;6O_{2}\;\;\;\;\rightarrow \;\;\;\;6CO_{2}\;\;\;\;+\;\;\;\;H_{2}O\;+\;Energy$

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3.2 Classify Chemical Equations

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