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The chemistry of life
Basic Things about chemistry
16
Chemistry
9th Grade
11/21/2009

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Term
Atom
Definition
Basic unit of matter
Term
Nucleus
Definition
Located in the center of the atom and consists of protons and neutrons
Term
Electron
Definition
negative charged particle
Term
Protons
Definition
positively charged particles
Term
Element
Definition
pure substance that consists entirely of one type of atom
Term
Isotopes
Definition
atoms of the same element that differ in the number of neutrons they contain
Term
Ions
Definition
Positively and negatively charged atoms
Term
Buffer
Definition
Weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
Term
Solute
Definition
substance that is dissolved in a solvent to make a solution
Term
Acid
Definition
compound that forms hydrogen ions in solution
Term
Cohesion
Definition
attraction between molecules of the same substance
Term
Van der Waals forces
Definition
a slight attraction that developes between the oppositely charged regions of nearby molecules
Term
Suspension
Definition
Mixture of H2O and nondessolved materials
Term
Base
Definition
compound that produces hydroxide ions in solution
Term
Mixture
Definition
material composed of two or more elements or compounds that are physically mixed together but not chemically combined
Term
Solution
Definition
mixture of two or more substances in which the molecules of the substances are evenly distributed
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