An alpha particle is closest in atomic mass to which element?

a. H

b. He

c. Ne

d. Xe

Why is the first ionization energy of a nonmetal much higher than that of an alkali metal

What volume of product is produced when 20.0 Mg of liquid hydrogen reacts with excess liquid oxygen in a rocket propellant reaction? Gas is formed 101.3 to 5 kPa and 40.0 °C

What is the molar mass of the following substance : Cs2CO3

What is its molar heat of vaporization in kilojoules per mole if its vapor pressure at 20°C is 11.0 torr?

1. What is an air mass? 1. a large body of air with the same temperature and moisture. 2. any kind of cloud that produces rain, sleet, snow, or hail. 3. a place where weather always changes in an extreme way.

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide