Question

4. Some metals oxidize in air to form an oxide compound with a trivalent metal cation M . a) What is the simplest formula for this type of metal oxide? b) Write a balanced chemical reaction for such a metal oxi3dation reaction in air. 5. Why don't we use metals as fuels but instead prefer to burn hydrocarbons like natural gas (CH4) or gasoline (C6H6 )? Hint: write an oxidation reaction for either of these compounds and examine the chemical waste products.

Answer 1

4Ans.

a. Simplest formula of metal oxide is  

b. Balanced chemical equation of metal react with oxygen

4M +302 21.02

Example. $4Al+3O_{2}\rightarrow 2Al_{2}O_{3 }$

5 Ans.

Hydrocarbons are used as fules because on burning these hydrocarbons will produce heat energy with that we can run the engines.. But instead of hydrocarbons if we use metals it won't produce any energy.

Example

$CH{_4}+2O_{2}\rightarrow CO{_2}+2H{_2}O+Heat$

But metal react with oxygen forms metal oxides

Example.

$4Al+3O_{2}\rightarrow 2Al_{2}O_{3 }$

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