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science quiz

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compound
a pure stubstance made of 2+ atoms that are chemically combined
molecule
the smallest particle of a substance having all the characteristics of the substance
_______ and ______ make up the nucleus of an atom
protons neutrons
what happens to the molecules of different substances when they react
molecules break apart and recombine to form other things
what is always produced from a chemical reaction
a change
what is a chemical reaction
when a chemical changes becuase of another chemical
mixture
two or more substances that are mixed together but are not chemically combind
pure substance
a substance that is chemically bonded together or an indivule element
element
a pure substance that cannot be broken down into other substances there are just over 100 known elements
atom
the smallest complete piece of an element all matter is made up of atoms
the atomic mass of lead (Pb) is __________ which means that one ______ of lead has a mass of __________ amu.
207.2 atom 207.2
the ______ ________ assigned to each element on the periodic table is the number of __________ in its _________
atomic number protons neucleus
the three parts of an atom are called _________,_____,and ________.
neutron proton electron
an element and combination of elements chemically bonded together are called __________ ________
pure substances
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