1. Which is not a characteristic of a compound?
•has different properties from its component elements
•can be represented by a chernical formula
•different samples have different properties
•a pure substance made of two or more elements

Electric charge is uniformly distributed inside a nonconducting sphere of radius 0.30 m. the electric field at a point p, which is 0.50 m from the center of the sphere, is 15,000 n/c and is directed radially outward. what is the maximum magnitude of the electric field due to this sphere

What is the fate of the electrons that interact with a specimen in an electron microscope?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?