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UCF Chemistry 2045C Exam 1 With Complete Solutions Latest Update 100% Correct
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UCF Chemistry 2045C Exam 1 With Complete Solutions Latest Update 100% Correct...
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UCF Chemistry 2045C Exam 1 With CompleteSolutions Latest Update 100% Correct
Element
•Substances that cannot be decomposed into simpler substances by chemical reactions
•basic building blocks of matter
Compound
•Substances that can be decomposed
•composed of molecules that contain two or more different kinds of atoms
Ion
atom with either a positive or negative net charge due to the loss or gain of an electron
Homogeneous
mixture that has uniform composition throughout
Heterogeneous
mixture that is not uniform throughout
Physical Changes
boiling
freezing
condensation
sublimation
,melting
dissolving
Chemical Changes
•process that changes the composition of matter
•Energy is released in the quantity
•Rusting of
•Burning of
Evaporation of rubbing alcohol chemical
Hair bleached with hydrogen peroxide chemical
Frost forms on a cold night physical
Dry ice sublimes (without melting) physical
Baking a cake chemical
0.009 millimeters
ONE sig. fig
0.0005 millimeters
ONE sig. fig
602,214,179,300,000,000,000,000
•First 0 IS significant
, •10 sig. figs.
4,540,000,000 years old
zeros are not significant
Height of Empire State Building is 373.08m
the zero within the number IS significant
California Minimum Wage is $8.00
Significant
(zeros that specify a value are significant)
Number of students in a class is 21.0000.
Exact numbers can have infinite significant figures
ROUNDING
<5 round down
>5 round up
=5 round to next even number!
150.0 g H2O
+ 1.350 g NaCl
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