Atheory that has been proven true repeatedly over time and never disproven is called ? ?

Compare and contrast physical changes with chemical changes.

What three things determine the shape and size of a puddle when water is poured out onto a surface

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent