29 terms

Chapter 4 (Elements, Compounds, and Mixtures)

Please use this review to prepare for the Unit Four test.
STUDY
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element
pure substance that cannot be broken down by physical or chemical means
compound
two or more elements chemically combined
periodic table
chart that lists all the natural and man-made elements there are in the world
solution
special mixture where particles are spread out evenly, act like one substance and particles so small they don't even scatter light, saltwater is an example
solvent
the substance that does the dissolving
solute
the substance that gets dissolved
suspension
solution where the particles are too big they settle out, a snow-globe is an example
mercury
the only metal that is liquid at room temperature
saturated
a solution where no more solute can dissolve into the solvent
dilute
does not have a lot of solute for the amount of solvent
concentrated
where there is a lot of solute for the amount of solvent
separate
ways to _ _ _ _ _ _ _ _ mixtures is by pick out, filter, evaporation, distillation, magnet, centrifuge
helium
the second lightest element in the world
hydrogen
the lightest element in the world
electrolysis
one way to separate a compound by running electricity through the compound
metals
to the left of "red" line on our periodic table, what most of the periodic table is, and most are solid, shiny, and good conductors of heat and electricity
metalloids
right on the "red" line on our periodic table, has properties of metals and non-metals
nonmetals
to the right of the "red" line on our periodic table, many are gases and poor conductors of heat and electricity
reaction
you need a chemical _ _ _ _ _ _ _ _ to form a compound and you need a chemical _ _ _ _ _ _ _ _ to break it back apart
colloid
a special solution where the particle are NOT too big they settle out, but large enough they DO scatter light, milk and shaving cream are examples
evaporation
one technique (besides boiling) that we used to separate the salt from the salt-water solution
dissolve
to make a solute _ _ _ _ _ _ _ _ faster you can heat it, stir it, or crush it
alloy
a metal dissolved in another metal
solubility
ability of one substance to dissolve into another substance
insoluble
if one substance does NOT dissolve very easily into another substance
mixture
when two or more elements (or compounds) are physically mixed together, a salad is a good example
92
how many natural elements there are in the world
atom
the smallest part of an element is one ______ of the element. What everything in the world is make of!
molecule
the smallest part of a compound that still has properties of that compound, if you break a compound down to its simplest form you have a ___________