2nd Six Weeks Warm Up 9
Which of the following is not an element?
Rock
Calcium
Hydrogen
Silicon
Elements are pure substances.
True or False
True
False
about 2%
about 28%
about 8%
about 36%
What percentage ofthe crust do "Al" and "Si" make up?
a pure substance
made of two or more elements chemically bonded
located on the periodic table
not found on earth
Which statement
 shouldbe listed under compounds?
a pure substance
made of two or more elements chemically bonded
located on the periodic table
both A and C
Which statement shouldbe listed under elements?
Pure substances
made of two or more elements chemically bonded
necessary for life
made of only one type of atom
Which statement shouldbe listed in themiddle?
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