91Ó°ÊÓ

Use the following equations to answer the next four questions:

i.\({H_2}O\left( s \right) \to {H_2}O\left( l \right)\)

ii.\(N{a^ + }\left( {aq} \right) + C{l^ - }\left( {aq} \right) + A{g^ + }\left( {aq} \right) + NO_3^ - \left( {aq} \right) \to AgCl\left( s \right) + N{a^ + }\left( {aq} \right) + NO_3^ - \left( {aq} \right)\)

iii.\(C{H_3}OH\left( g \right) + {O_2}\left( g \right) \to C{O_2}\left( g \right) + {H_2}O\left( g \right)\)

iv. \(2{H_2}O\left( l \right) \to 2{H_2}\left( g \right) + {O_2}\left( g \right)\)

v. \({H^ + }\left( {aq} \right) + O{H^ - }\left( {aq} \right) \to {H_2}O\left( l \right)\)

(a) Which equation describes a physical change?

(b)Which equation identifies the reactants and products of a combustion reaction?

(c)Which equation is not balanced?

(d)Which is a net ionic equation?

Step by step solution

01

Physical change (a)

Reaction (i) indicates a conversion of water from the solid to the liquid state.

\({H_2}O\left( s \right) \to {H_2}O\left( l \right).\)

02

Combustion reaction (b)

Reaction (iii) represents a combustion reaction with the gaseous carbon dioxide and water vapor as products.

\(C{H_3}OH\left( g \right) + {O_2}\left( g \right) \to C{O_2}\left( g \right) + {H_2}O\left( g \right).\)

03

Unbalanced equation (c)

Reaction (iii) is not balanced with respect to the hydrogen atoms. There are 4 hydrogen atoms in the reactants and the 2 hydrogen atoms in the products.

\(C{H_3}OH\left( g \right) + {O_2}\left( g \right) \to C{O_2}\left( g \right) + {H_2}O\left( g \right).\)

04

Net ionic equation (d)

The hydrogen and hydroxyl ions in their dissolved state react to become liquid water.

\({H^ + }\left( {aq} \right) + O{H^ - }\left( {aq} \right) \to {H_2}O\left( l \right).\)

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