1. oxygen has an electronegativity of 3.5, and carbon has an electronegativity of 2.5. how is charge distributed on an oxygen atom when it bonds with a
carbon atom?
the oxygen atom has a slightly negative charge.
the oxygen atom has a charge of 1-.
the oxygen atom has a charge of 1+.
the oxygen atom has a slightly positive charge.

1-

Step-by-step explanation:

because 1 was removed from it

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.