why does the oxygen atom in a water molecule have a negative charge?
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a. water is made of two ionic bonds.
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b. oxygen attracts electrons more strongly than hydrogen does.
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c. water is a nonpolar molecule.
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d. hydrogen bonding pulls electrons toward oxygen.

The answer is B.

Explanation:

A is incorrect because water is a molecule with covalent bonds.

C is incorrect because water is very much polar, since Oxygen has a relatively higher electronegativity than Hydrogen (so the difference of their electronegativities would be greater than 0.3 and less than 1.7).

D is incorrect because the bonds between elements in the water molecules is  not hydrogen bonding since water is a molecule in its own right, with strong bonds.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this