When helium was discovered by humans?

If zinc chloride weighs 136.28 g/mol, what is its molecular formula? show calculations

A 50.0 mL sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. What is the new volume? 0.0100 mL 0.325 mL 25.0 mL 100. mL

The kinetic molecular theory describes the behavior of gases in terms of particles in?

The true statement concerning the atomic nucleus is: It contains protons, neutrons, and electrons. It takes up most of the volume of the atom. It contains most of the mass of the atom. It is made up of electrons only. SH

True or false all countries are legally bound to survey and monitor for disease within their bodies

If there are 2.54cm in an inch, how many inches are in 14.8cm?

Given the reaction: 2 Na (s) + Cl 2 (g) → 2 NaCl (s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl 2 ≡ 2 mol NaCl. True or false?

Taking a cross section of a fiber can reveal what?

A? relay is a relay that not only maintains its contacts in the last position without a continuously energized coil, but also with a mechanical mechanism or remnant magnetism until it resets electrically.

What is a "curie"? A. standard charge of alpha particles B. mass of one alpha particle C. unit of radioactive disintegration D. a unit of gamma radiation