13. the reaction a à b has an enthalpy change of -64 kj/mole and an activation energy of 22 kj/mole. what is the activation energy for the b à a reaction?

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Astable atom that has a large nucleus most likely contains 1. more neutrons than protons. 2.more protons than neutrons. 3.equal numbers of protons and neutrons. 4.changing numbers of protons and neutrons.

What is not within the scope of chemistry