### Theory:

When a material undergoes a chemical change or reaction, the chemical property is a trait or activity that can be observed. Chemical properties may be detected during or after the reaction since the arrangement of atoms inside a sample must be disrupted to analyse the property.

Let us see some of the physical properties of Non-metals:

Reaction with Oxygen:

Non-metals react with oxygen to form oxides.
$\begin{array}{l}\mathit{Non}\phantom{\rule{0.147em}{0ex}}\mathit{metal}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\mathit{Oxygen}\to \mathit{Oxide}\\ C\phantom{\rule{0.147em}{0ex}}+{O}_{2}\to {\mathit{CO}}_{2}\end{array}$

Reaction with Water:

Non-metals do not react with water, but they are very reactive in air.
$\begin{array}{l}\mathit{Non}-\mathit{metal}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\mathit{Water}\to \mathit{No}\phantom{\rule{0.147em}{0ex}}\mathit{reaction}\\ N+{H}_{2}O\to \mathit{No}\phantom{\rule{0.147em}{0ex}}\mathit{reaction}\end{array}$

Reaction with Acid:

Non-metals on reaction with acid

Non-metals do not react with dilute mineral acids but react with conc. sulphuric acids.
$\begin{array}{l}\mathit{Non}-\mathit{metal}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\mathit{Acid}\to \mathit{No}\phantom{\rule{0.147em}{0ex}}\mathit{reaction}\\ S\phantom{\rule{0.147em}{0ex}}+\mathit{HCl}\phantom{\rule{0.147em}{0ex}}\to \mathit{No}\phantom{\rule{0.147em}{0ex}}\mathit{reaction}\end{array}$

Reaction with Base:

Non-metals react with bases to form salt and water.
$\begin{array}{l}\mathit{Non}-\mathit{metal}+\mathit{Base}\to \mathit{Salt}\phantom{\rule{0.147em}{0ex}}+\mathit{Water}\\ {{\mathit{Cl}}_{2}+\mathit{Ca}\left(\mathit{OH}\right)}_{2}\to \mathit{Ca}\left(\mathit{OCl}\right)\mathit{Cl}+{H}_{2}O\end{array}$

Displacement reaction: More reactive non-metal replaces a less reactive non-metal from its compound.

$\begin{array}{l}\mathit{More}\phantom{\rule{0.147em}{0ex}}\mathit{reactive}\phantom{\rule{0.147em}{0ex}}\mathit{non}-\mathit{metal}+\mathit{less}\phantom{\rule{0.147em}{0ex}}\mathit{reactive}\phantom{\rule{0.147em}{0ex}}\mathit{non}-\mathit{metal}\phantom{\rule{0.147em}{0ex}}\mathit{compound}\to \mathit{More}\phantom{\rule{0.147em}{0ex}}\mathit{reactive}\phantom{\rule{0.147em}{0ex}}\mathit{non}-\mathit{metal}\phantom{\rule{0.147em}{0ex}}\mathit{compound}+\mathit{Less}\phantom{\rule{0.147em}{0ex}}\mathit{reactive}\phantom{\rule{0.147em}{0ex}}\mathit{non}-\mathit{metal}\\ {\mathit{Cl}}_{2}+2\mathit{KBr}\to \mathit{2KCl}+{\mathit{Br}}_{2}\end{array}$
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