week 10 - Double-Displacement Reactions (ii) Gas-Formation...

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Double-Displacement Reactions (ii) Gas-Formation Reactions ! In some double-displacement reactions, a gas is formed, which helps drive the reaction to completion. 1. ZnS 2 (s) + HCl (aq) ! ZnCl 2 (aq) + H 2 S (g) 2. CaCO 3 ( s ) + 2HCl( aq ) ! CaCl 2 ( aq ) + H 2 CO 3 ( aq ) H 2 CO 3 ( aq ) ! H 2 O( l ) + CO 2 ( g ) CaCO 3 ( s ) + 2HCl( aq ) ! CaCl 2 ( aq ) + H 2 O( l ) + CO 2 ( g ) Double-Displacement Reactions (iii) Acid-Base Neutralization Reactions ! An acid reacts with a base to form an ionic compound (salt) and water. HCl( aq ) + NaOH( aq ) ! NaCl( aq ) + H 2 O( l ) Acid Base Salt Water Q> Complete and balance the following equation: HCl( aq ) + Mg(OH) 2 ( s ) !
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Combustion Reactions ! A combustion reaction is a 5 th type of reaction that does not always fall into one of the earlier categories. ! In a combustion reaction, a substance reacts with oxygen in a reaction that burns to produce heat and flame . ! The most common combustion reactions involve the burning of a hydrocarbon, or a hydrocarbon containing oxygen. The products are always carbon dioxide and water. 2C 8 H 18 ( g ) + 25O 2 ( g ) ! 16CO 2 ( g ) + 18H 2 O( g ) ! Nonmetal combustion: S 8 (s) + 8O 2 (g) ! 8SO 2 (g) ! Metal combustion: 2Mg (s) + O 2 (g) ! 2MgO (s) Molecular equation: AgNO 3 ( aq ) + NaCl( aq ) ! AgCl( s ) + NaNO 3 ( aq ) Ionic equation : shows soluble ionic compounds as separate ions Ag + ( aq
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week 10 - Double-Displacement Reactions (ii) Gas-Formation...

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