Why is density used to determine the identity of matter?

A light wave traveling through medium 1 strikes a boundary with medium 2 at at a 45 degree angle. the light then enters the second medium and refracts toward the boundary. what would the two mediums be? 1. Water Air 2. Diamond Air 3. Air Glass 4.

A method for showing what a molecule or compound contains

Which of the following best describes alternating current? current that increases and decreases in temperature current that constantly turns on and off current in which charges change direction current that gains and loses electrons

A car starts from rest at a stop sign. It accelerates at 4.0 m/s2 for 3 seconds, coasts for 4 s, and then slows down at a rate of 3.0 m/s2 for the next stop sign. How far apart are the stop signs?

What happens to the atomic number of an atom when the number of neutrons in the nucleus of that atom increases? It decreases. It increases. It remains the same.

If you have a beam perfectly balanced on a fulcrum and put a weight at the very end of one side, is there a way to know where you should put a heavier object on the other end?

Most of the Earth's volcanoes occuWhen fossils or minerals form, certain unstable elements are sometimes locked into them.

a man is standing on the edge of a 20.0m high cliff. he throws a rock vertically with an initial velocity of 10.0m/s. how high does the rock go?

The slope of a velocity time graph over any interval of time gives the during that interval

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength