Classify the substances given in into elements and compounds:
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Elements
Compounds
$Cu$
$Sand$
$O_2$
$H_2O$
$Zn$
$CaCO_3$
$F_2$
$NaCl(aq)$
$Hg$
$Diamond(Carbon)$
Wood is neither an element nor compound. It is a mixture.
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Classify the following as physical or chemical properties: The composition of a sample of steel is, $98 \%$ iron, $1.5 \%$ carbon and $0.5 \%$ other elements.