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Matter #1

Classification of Matter

TermDefinition
Matter Anything that takes up space and has mass
Atom The smallest unit of an element that maintains the properties of that element
Proton A subatomic particle that has a positive charge and is found in the nucleus of an atom
Neutron A subatomic particle that has no electric charge and is found in the nucleus of an atom
Electron A subatomic particle that has a negative charge and is found in the electron cloud outside the nucleus
Nucleus An atom's central region which is made up of protons and neutrons; the atom's mass is found here
Molecule The smallest unit of a substance that retains all the properties of the substance and is composed of two or more atoms
Element A substance that cannot be separated or broken down into simpler substances by chemical means (gold, hydrogen, aluminum); composed of one type of atom
Compound A substance made up of atoms of two or more different elements joined by chemical bonds
Mixture A combination of two or more substances that are not chemically combined; you can separate the substance by physical means (Example: pizza; salt water)
Solvent In a solution, the substance in which the solute is dissolved (In salt water, the solvent is the water.)
Solute The substance that is dissolved in a solution (In salt water, the solute is the salt.)
Solution homogeneous mixture of two or more substances that are distributed evenly among each other; the appearance is the same throughout the mixture; the mixture appears to be a single substance (soft drink, gasoline, brass)
Atomic Number The number of protons in the nucleus of an atom; the atomic number identifies an atom and its place on the periodic table
Atomic Mass The total number of protons and neutrons in an atom
Isotopes Atoms that have the same number of protons (or the same atomic number) as other atoms of the same element but have different numbers of neutrons (and thus a different atomic mass)
Heterogeneous Mixtures consisting of dissimilar substances; not homogeneous; the substances can be easily seen and separated (Examples: trail mix)
Homogeneous Mixtures which are uniform in structure or composition throughout; the separate substances cannot be easily seen (Examples: Dr. Pepper; brass)
Colloid A mixture in which the particles are dispersed throughout but are not heavy enough to settle out (examples: milk, toothpaste)
Pure Substance A single element or a single compound that has definite chemical and physical properties(pure gold; carbon dioxide; oxygen)
Suspension A mixture containing particles large enough to settle out (Example: Italian salad dressing)
Created by: ritajrogers