mid year review
chemistry earth history infectious diseases
Chemistry-8.P.1 understand the properties of matter and changes that occur when interacts in an open and closed container
2 physical change exp a piece of paper being cut it is still paper but a chemical change burn the paper and you would get ash now its not paper anymore and you have a chemical change
3 Elements are a substance that cannot be broken down into simpler substances by chemical means
compounds are a thing that is composed of two or more separate elements
mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occur
Periodic table has 7 horizontal rows known as periods
groups are columns of elements on the periodic table that share common properties
metals are located to the left and to the right of the periodic table non metals are located at the top to bottom right side of the table and the metalliods are also located top to bottom of the right
atomic number is the number of protons in the nucleus
atomic mass is the mass of an atomic particle, sub-atomic particle, or molecule.
a proton is stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.