atoms, elements & compounds

Cards (9)

what are all substances made of?
atoms
what is an atom?
the smallest part of an element that can exist
what is an element?
a substance of only one type of atom
how are elements listed & approximately how many are there?
they are listed in the periodic table and there are approximately 100
how are compounds formed?
from elements by chemical reactions
what do chemical reactions involve?
the formation of one or more new substances, and often a detectable energy change
what do compounds contain?
two or more elements chemically combined in fixed proportions
how can compounds be separated into elements?
chemical reactions
do compounds have the same properties as their elements?
no , they have different properties