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.

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation:

it would lead to upper respiratory infections and pneumonia.