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units in chemistry
Quiz 1
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Properties that can be
studie
d by your senses are physical properties
Physical properties
include colour, odour, melting point, boiling point, density
properties That you need to know what
chemicals
are in them are called
chemical properties.
Intensive properties
are
independent
of the amount of
matter
Extensive properties
are
dependent
on the amount of
matter
Physical changes
are
irreversible/reversible
but do not
change
the
chemical composition
of the
substance
Chemical changes
are
irreversible
/
reversible
and the
molecular
composition of
matter
changes
kg
Kilogram
Km
kilometer
G
Gram
Mm
Millimeter
dL
Deciliter
Dg
Dekagram
cg
Centigram
Hg
hectogram
How many sig figs?
56783.08
7
Perform the following addition and report the result with the correct number of significant figures: 0.002345+0.0009876+0.001230.
0.004563
D = ?/?
D =
m
/v
For
addition
and
subtraction,
the final answer's
period
will be in the
same
place as the number with the
least
# of sig figs.
For
multiplication
and
division
, the final answer will have the
same
# of sig figs as the # with the
least
sig figs.
F=
1.8x
°c +
32
K=
°c
+
273.15
Accuracy
is the closeness of a measured value to the true value
Precision
is a
measure
of the
reproducibility
or
repeating
nature
of a set of measurements