What is Ca3N2? I'm really confused

What is the charge of an object with 14 electrons and 6 protons

How are atom's chemical properties determined by the number of neutrons in its outermost shell by the number of electrons in its outermost shell by the number of protons in its outermost shell by the number of shells

Is it possible for a change of physical state to occur in an isolated system?

Describe a simple experiment to show that sound cannot propagate through vacuum

Which of the following charged particles will experience no magnetic force while in a magnetic field. A particle moving at a 90 degree angle to the magnetic field. A particle moving at a 45 degree angle to the magnetic field.

A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. Assume that any other unbalanced forces are negligible. What is the speed of the wreckage just after the collision?

What is the spine also known as

If a man has a mass of 74 kilograms runs 800 meters in 150 seconds, what is his average momentum?

Two lamps one rated 40W at 220 V and the other 60W at 220 V are connected in parallel to the electric supply at 220V.

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 n. What is the magnitude of the acceleration of the elevator?