Identify the charge on the nucleus and on the electrons of an atom. How do i do this?

Select the ion. a) NO2 b) H2SO4 c) Al+3 ... ?

Consider the balanced equation below. N2H4 + 2H2O2 → N2 + 4H2O What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water? 1:2 and 1:4 1:3 and 1:4 1:2 and 3:5 1:3 and 3:5

Can Xenon (Xe) be bought by a regular person? why or why not?

What is the oxidation half-reaction for Fe (s) + 2HCl (aq) to FeCl2 (aq) + H2 (g) ?

One solution turns blue. A possible hydrogen ion concentration for this solution is: 1 * 10-2 M 5 * 10-2 M 5 * 10-4 M 1 * 10-8 M

Air is transferred from a 75 L tank where the pressure is 125 psi and the temperture is 288 k to a tire with a volume of 6.1 L and a pressure of 25 psi. What is the new temperture.

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.