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Chemistry Unit 1

Comfortable Chemistry:)

Element a substance whose atoms are all chemically the same , containing a definite number of protons
Compound a substance containing more than one element. They have fixed compositions and always contain the same elements in the same elements in the same % by mass
Solution a homogenous mixture containing a solvent (usually a liquid) and one or more solutes (liquid, solids, and/or gases). Note: Mixtures usually have more solvent than solutes
Mixture two or more substances combined so that each substance retains its chemical identity.
Physical Properties Properties which can be determined without changing the chemical identity of a substance (i.e. density, melting and boiling points).
Chemical Properties Properties of a substance that are observed during a chemical reaction
Chromatography A complex, but versatile method of separating compounds of a mixture.
Atom is a neutral species
Ion is a positive or negative species...When the element is not neutral.
ionic compound contains a metal and nonmetal
covalent contains 2 or more non-metals
When naming 2-element compounds they must end in -ide
Group I +1 charge
Group II +2 charge
Group VI -2 charge
Group VII -1 charge
Cu +1 or +2 charge
Fe +2 or +3 charge
Chemistry study of matter and its properties
Matter anything that has mas and a volume States of Matter, solid, liquid, and gas
Physical change occurs when a substance alters its physical properties not its composition
Chemical change occurs when a substance is converted into a different substance
Extensive properties dependent on the amount of substance present. Mass and Volume
Intensive properties independent of the amount of a substance present. Density
Homogenous mixture same composition throughout. Ex. milk
Heterogeneous mixture does not have the same composition throughout
Period row of elements on the periodic table
Group column of elements on the periodic table
Atomic number whole number on periodic table. Identifies number of protons. The number of protons is unique to each element.
Atomic mass decimal number on the periodic table. It is the total number of protons and neutrons. Determined by averaging the isotopes of each element.
Isotope elements that have different number of neutrons
Proton subatomic particle that resides in the nucleus. Positively Charged.
Electron subatomic particle located in the electron cloud. Negatively Charged.
Neutron subatomic particle resides in the nucleus. Neutral.
Neutral elements have the same number of electrons and protons. When the element is not neutral, it is known as an ion
Created by: brooksfamily47



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