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Chemistry
Problem Which of the following represents a physical change?
a) 2 H 2 O 2 ( a q ) → 2 H 2 O ( l ) + O 2 ( g ) 2\,\mathrm{H_2O_2(aq)} \;\rightarrow\; 2\,\mathrm{H_2O(l)} + \mathrm{O_2(g)} 2 H 2 O 2 ( aq ) → 2 H 2 O ( l ) + O 2 ( g ) N H 3 ( g ) + H C l ( g ) → N H 4 C l ( s ) \mathrm{NH_3(g)} + \mathrm{HCl(g)} \;\rightarrow\; \mathrm{NH_4Cl(s)} N H 3 ( g ) + HCl ( g ) → N H 4 Cl ( s ) C O 2 ( g ) → C O 2 ( s ) \mathrm{CO_2(g)} \;\rightarrow\; \mathrm{CO_2(s)} C O 2 ( g ) → C O 2 ( s ) A g N O 3 ( a q ) + N a C l ( a q ) → A g C l ( s ) + N a N O 3 ( a q ) \mathrm{AgNO_3(aq)} + \mathrm{NaCl(aq)} \;\rightarrow\; \mathrm{AgCl(s)} + \mathrm{NaNO_3(aq)} AgN O 3 ( aq ) + NaCl ( aq ) → AgCl ( s ) + NaN O 3 ( aq ) Browse the problem library