EESA01H3 Lecture Notes - Lecture 2: Hydrogen Bond, Covalent Bond, Graduated Cylinder
16 Sep 2016
School
Department
Course
Professor
Document Summary
Eesa01 lecture 2 matter, energy and the systems. Anything in the universe that has mass and occupies space. It can move around and can be stored in different things depending on what it is. Different types of matter: element: same atoms. Example: mercury: compound: 2 or more different atoms. Example: water, which is composed of hydrogen and oxygen: mixture of compounds and elements together. The atomic mass of an element: an average of the stable isotopes that exist for that element, largely comes from protons and neutrons. Stable isotopes versus radioactive isotopes: stable isotopes. When the number of neutrons is almost equal to the number of protons. 2:1 or 1. 5:1 ratio of neutrons and protons. The isotope will not expel neutrons out of the nucleus: radioactive isotopes. When there are too many or too few neutrons in relation to the number of protons. There is a tendency that the element may actually be changed into a different element.
