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Patterns of Chemical Reactivity - Examples of common...

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Stoichiometry: Chemical Formulas and Equations Patterns of chemical reactivity Patterns of Chemical Reactivity Using the periodic table We can often predict a reaction if we have seen a similar reaction before. For example, sodium (Na) reacts with water (H 2 0) to form sodium hydroxide (NaOH) and H 2 gas: note: (aq) indicates aqueous liquid Potassium (K) is in the same family (column) of elements in the periodic table. Therefore, one might predict that the reaction of K with H 2 O would be similar to that of Na: In fact, all alkali metals react with water to form their hydroxide compounds and hydrogen . Combustion in air Combustion reactions are rapid reactions that produce a flame . Most common combustion reactions involve oxygen (O 2 ) from the air as a reactant . A common class of compounds which can participate in combustion reactions are hydrocarbons (compounds that contain only carbon and hydrogen).
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Unformatted text preview: Examples of common hydrocarbons: Name Molecular formula methane CH 4 propane C 3 H 8 butane C 4 H 10 octane C 8 H 18 When hydrocarbons are combusted they react with oxygen (O2) to form carbon dioxide (CO 2 ) and water (H 2 O). For example, when propane is burned the reaction is: Other compounds which contain carbon, hydrogen and oxygen (e.g. the alcohol methanol CH 3 OH, and the sugar glucose C 6 H 12 O 6 ) also combust in the presence of oxygen (O 2 ) to produce CO 2 and H 2 O. Combination and decomposition reactions In combination reactions two or more compounds react to form one product: In decomposition reactions one substance undergoes a reaction to form two or more products. For example, many metal carbonates undergo a heat dependent decomposition to the corresponding oxide plus CO 2 : 1996 Michael Blaber...
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