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Derive chemical equations from narrative descriptions of chemical reactions. Write and balance chemical equations in molecular, total ionic, and net ionic formats. The preceding chapter introduced the use of element symbols to represent individual atoms.
Process: split the reaction into two half-reactions, balance the atoms and charges in each half-reaction, and then combine the half-reactions, ensuring that electrons are balanced. Example: Cu + HNO 3 = Cu(NO 3 ) 2 + NO 2 + H 2 O
Combustion Reactions! • Examples: CH 4 (g) + 2 O 2 (g) → CO 2 (g) + 2 H 2O (g) C 3H 8 (g) + 5 O 2 (g) → 3 CO 2 (g) + 4 H 2O (g) 2H 2 + O 2----- 2H 2O • Rapid reactions that have oxygen as a reactant sometimes produce a flame • Most often involve hydrocarbons reacting with oxygen in the air to produce CO 2 and H 2O.
Consider as an example the reaction between one methane molecule (CH4) and two diatomic oxygen molecules (O2) to produce one carbon dioxide molecule (CO2) and two water molecules (H2O).
14 Αυγ 2020 · Example \(\PageIndex{2}\): Number of Product Molecules Generated by a Reaction. How many carbon dioxide molecules are produced when 0.75 mol of propane is combusted according to this equation? \[\ce{C3H8 + 5O2 \rightarrow 3CO2 + 4H2O} \label{4.4.6} \]
THE CHEMICAL REACTION EQUATION AND STOICHIOMETRY Example: • The stoichiometric coefficients in the chemical reaction equation tell you the relative amounts of moles of chemical species that react and are produced by the reaction. • 1 mole (not lb, or kg) of heptane will react with 11 moles of oxygen to
CO2 + Mg(OH)2 = Mg2(CO3)(OH)2 + H2O is a Double Displacement (Metathesis) reaction where one mole of Carbon Dioxide [CO 2] and two moles of Magnesium Hydroxide [Mg(OH) 2] react to form one mole of Pokrovskite [Mg 2 (CO 3)(OH) 2] and one mole of Water [H 2 O]
