why do materials lose their properties upon mixing with another material to form compoundfs?
eg: oxygen + hydrogen = water, when oxygen supports burning and hydrogen is highly inflammable, water acts as an extinguisher of fire.
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Solution
The compounds are formed by the chemical combination of their constituents. And so they don't have the same properties as that of constituents in their independent state. Water is also a compound and it is formed by the chemical combination of hydrogen and oxygen in fixed proportion by mass. It can't have the same properties as that of hydrogen or oxygen.