#chemistry study

Manos, como assim minhas aulas começaram há uns 15 dias e eu já tenho prova essa semana????

unit 1

|| BASICS ||

|| Core's Structure ||

Its made out of protons and neutrons. Those particles are ingridients of the core are known as nucleus. Owing to the fact that the neutrons are neutrally charged the core is possitvely charged.

Atomic Number (Z): the number of protons on the core of atom. Since an atom is neutral the number of protons is equal to the electron population, p=e=Z

Mass Number (A): the number of protons and neutrons on the core of an Atom. A=p +n

Isotope: Atom with the same Atomic number but different Mass number.

Radioisotope: artificial isotope

Isobaric: Elements with differet Atomic number and same Mass number

~The atom of an element is made of: 1. The core (protons/ p+ and neutrons/ n) 2.Electrons e-

Protons: Possitively charged particles and their mass is almost equal with the mass of hydrogens atom.

Neutrons: Products of neutralization of a proton and a electron, their mass is a bit bigger than p+. It is neutrally charged.

Electrons: An atom ingridient that was first discovered along with the upgoing radiation in 1859. It is negatively charged and it has charge the least possible 1.6*10^(-19)Cb. Its mass is 1/1840 of the proton mass.

|| ION ||-> Atoms or a number of atoms that are charged

Cation-> positively charged ion

Anion->negatively charged ion

~Compounds made of oppositely charged ions they are held by ionic bonds. The ones with same charged are called Colevant.~

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Density -> Mass concentrations d=Mass\Volume

Mass-> its constant. Weight depends on gravity and differs acceleration a tiny bit from place to place.

(1.3)

|| Thomson's atomic model ||

It was the first model that existed and according to it the atom is formed by possitive and negative particles. The possitive charge is smoothly concentrated in a sphere in which the electrons move.

|| Rutherford's atomic model ||

According to it almost the whole mass, including the positive particle of the atom its concentrated in a central area which dominates the least space comparing with the whole atom, while the electrons move around it in defined orbits.

saturday, 3rd october 2020

chemistry being my favourite science means more incentive to make notes,,, at least, after i finish all the homework i get set every day :(

July 08, 2020.