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32 Cards in this Set

  • Front
  • Back
anything that occupies space and has mass
a pure substance that cannot be broken down into other substances by chemical means
trace element
elements that make up less than 0.01 percent of your body mass, are nevertheless critical to your health
a substance containing two or more elements that are chemically combined in a fixed ratio
the smallest possible particle of an element
a subatomic particle with a single unit of positive electrical charge
a subatomic particle with a single unit of negative electrical charge
electrically neutral
in an atom, the central core that contains protons and neutrons
atomic number
number of protons in an atom's nucleus; is unique for each element
one of several forms of an element, each containing the same number of protons in their atoms but a different number of neutrons
radioactive isotope
isotope in which the nucleus decays (breaks down) over time, giving off radiation in the form of matter and energy
ionic bond
chemical bond that occurs when an atom transfers an electron to another atom
atom that has become electrically charged as a result of gaining or losing an electron
covalent bond
chemical bond that forms when two atoms share electrons
two or more atoms held together by covalent bonds
chemical reaction
breaking of old and formation of new chemical bonds that result in new substances
starting material for a chemical reaction
material created as a result of a chemical reaction
polar molecule
molecule in which opposite ends have opposite electric charges
hydrogen bond
bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule
tendency of molecules of the same kind to stick to one another
thermal energy
total amount of energy associated with the random movement of atoms and molecules in a sample of matter
measure of the average energy of random motion of particles in a substance
uniform mixture of two or more substances
substance in a solution that dissolves the other substance and is present in the greater amount
substance in a solution that is dissolved and is present in a lesser amount
aqueous solution
solution in which water is the solvent
compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale
compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale
pH scale
a range of numbers used to describe how acidic or basic a solution is; ranges from 0 (most acidic) to 14 (most basic)
substance that maintains a fairly constant pH in a solution by accepting H+ ions when their levels rise and donating H+ ions when their levels fall