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This is propane, a hydrocarbon. The hydrogens are covalently bonded to the carbon atoms. These covalent bonds are relatively strong. The carbon and the hydrogen have an almost equal share of the electrons in the bond. The hydrogens are not acidic. |
This is nitric acid. The hydrogen is bonded to the oxygen. The hydrogens are acidic.
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This is ammonia. The hydrogens are bonded to the nitrogen atom. The hydrogens are not acidic. |
This is zinc hydroxide. The combination of a metal and hydroxide ions makes this a base. |