Answer:
The three best answers are:
Electric fields can be positive or negative (depending on source)
Electric fields can attrace or repel objets (assuming the object is charged)
Electric forces are strongest near the charged object E ∝ 1 / R^2
Polar molecules do have ionic bonds
The signs of a chemical reaction are bubbles, heat an magnesium disappearing.
The answer is D=M/V hope it helps!!
