Slide 1
Microscopic view of the atoms of the element argon (gas
phase).Microscopic view of the molecules of the element nitrogen
(gas phase).Elements, Compounds & MixturesElements
Note that an element: consists of only one kind of atom, cannot
be broken down into a simpler type of matter by either physical or
chemical means, and can exist as either atoms (e.g. argon) or
molecules (e.g., nitrogen). A molecule consists of two or more
atoms of the same element, or different elements, that are
chemically bound together. Note that the two nitrogen atoms which
comprise a nitrogen molecule move as a unit.
Microscopic view of the molecules of the compound water (gas
phase). Oxygen atoms are red and hydrogen atoms are
white.Compounds
Note that a compound: consists of atoms of two or more different
elements bound together, can be broken down into a simpler type of
matter (elements) by chemical means (but not by physical means),
has properties that are different from its component elements, and
always contains the same ratio of its component atoms.
Microscopic view of a gaseous mixture containing two elements
(argon and nitrogen) and a compound (water).Mixtures
Note that a mixture: consists of two or more different elements
and/or compounds physically intermingled, can be separated into its
components by physical means, and often retains many of the
properties of its components.
Salt molecule
mixture
What are examples of compounds mixtures and elements?some basic
compounds are: Carbon monoxide (CO), and carbon dioxide (CO2),
water (H2O), hydrogen peroxide (H2O2).
some elements are: iron, uranium, gold, neon, aluminum,
phospurus, nitrogen, carbon, and chlorine.
some mixtures are: Coke is a mixture of water, sugar,
flavorings, and carbon dioxide gas.
Milk is a mixture of water with various proteins, fats, and
other substances.
gasoline is a mixture of various hydrocarbons such as heptane
and octane, and additives.
The atmosphere is a mixture of gasses nitrogen, oxygen, carbon
dioxide, small amounts of other gasses and possibly water vapor,
water droplets (clouds), and solid particles (dust).
Compaound, mixture
Heterogeneous mixtures - mixture of sand and charcoal can be
separated out using a magnet
