Which characteristic of a substance is considered a chemical property? is it boiling point or reactivity or density or conductivity

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

What can you increase the strength of an electromagnet by

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion