Chemical properties of metals — lesson. Science CBSE, Class 8.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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 chemical properties of Metals:

Reaction with Oxygen:

Iron on reaction with air and moisture

Metals react with oxygen to form metal oxides.

\begin{array}{l} Metal + Oxygen \to Metal oxide \\ 2 Mg + O_{2} \to 2 MgO \end{array}

Reaction with Water:

Metals react with water to form metal hydroxide.

\begin{array}{l} Metal + Water \to Metal hydroxide + Hydrogen \\ 2 Na + H_{2} O \to 2 NaOH + H_{2} \end{array}

Reaction with Acid:

Metals react with acids to form salt and hydrogen gas.

\begin{array}{l} Metal + Acid \to salt + Hydrogen \\ Mg + 2 HCl \to Mg {Cl}_{2} + H_{2} \end{array}

Reaction with Base:

Metals react with bases to form salt and hydrogen gas.

\begin{array}{l} Metal + Base \to Salt + Hydrogen \\ Zn + 2 NaOH \to {Na}_{2} Zn O_{2} + H_{2} \end{array}

Displacement reaction:

More reactive metal replaces a less reactive metal from its compound.

\begin{array}{l} More reactive metal + less reactive metal compound \to More reactive metal compund + less reactive metal \\ Mg + Cu {SO}_{4} \to Mg {SO}_{4} + Cu \end{array}

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