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Chemistry Basic

Atom Smallest possible unit of an element that retains the physical and chemical properties of its element
Matter occupies space and has mass
Ion charged atom or molecule
Element a substance that can't be broken down into simpler substances by chemical reactions
Compound molecules made from more than one type of atom
Isotope atoms of an element that have the same atomic number but different mass number
Molecule atoms that have combined chemically
Atoms vs. elements atoms:smallest amount that makes up elements elements: Basic substance that can't be simplified
Molecule vs. compounds not all compounds are molecules but all molecules are compounds
Formation of an ion ion is an atom or molecule that has lost or has gained one or more valence electrons
Isotopes of various elements they have the same atomic number, but different mass
Polar covalent bond covalent bond formed by an unequal sharing of electrons between atoms
Non-polar covalent bond covalent bond formed by an equal sharing of electrons between atoms
Ionic bond Bond formed by the electrostatic attraction after the complete transfer of an electron from a donor atom to an acceptor
Proton, Neutron, and Electron Neutron= no charge Proton= +1 Electron= -1
pH scale differences basic, acidic, neutral In a neutral solution, [H+] = 10-7 M and [OH-] = 10-7 M. In an acidic solution where the [H+] = 10-5 M, the [OH-] = 10-9 M. In a basic solution where the [H+] = 10-9 M, the [OH-] = 10-5 M.
What is a pH scale? pH scale is a scale used to measure degree of acidity. It ranges from 0 to 14.
pH level in the environment increases or decreases Increase and decrease:substance that minimizes large sudden changes in pH.
Examples in which organisms resist pH to maintain homeostasis Work by accepting H+ ions from solution when they are in excess and by donating H+ ions to the solution when they have been depleted.
Created by: uzmpat1



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