When a chemical change happens we sometimes see a colour change. What other observations tell you that a chemical change is happening?

The nucleus of a hydrogen atom is a single proton, which has a radius of about the single electron in a hydrogen atom normally orbits the nucleus at a distance of what is the ratio of the density of the hydrogen nucleus to the density of the

What is the common term for potential difference? A. charge B. voltage C. current D. resistance

What is the largest index of refraction that the liquid could have such that the ray is still totally internally reflected? the index of refraction of glass is 1.50.

When a potential difference of 13 V is placed across a resistor, the current in the resistor is 1.4 a. What is the resistance of the resistor?

The theory of evolution explains that species change in small ways through a gradual process of natural selection that occurs over the course of many generations. These small changes can eventually lead to entirely new species.

Which theory was first proposed by Albert Einstein? A. the theory of special relativity B. the theory of universal gravitation C. the theory of inertia D. the theory of radioactivity ... the answer is A i just found out

For each of the following, describe the relationship as directly or inversely proportional: a) wavelength vs. frequency b) wavelength vs. energy c) frequency vs. energy ... ?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is