Transcript Chem-is-Try AD - Fort Bend ISD

Chem-is-Try AD
Units 1 & 2
Final Exam Review
Fall 2012
thatonerule:
#2135
Your desire
for success
is
aspiration,
actually
doing
something
about it is
perspiratio
n.
If you will miss the exam…
 In the auditorium on FIRST DAY
12:30 – 2:30
Monday Jan. 7.
 May schedule with
SECOND DAY
me to take the
7:30 – 9:30
exams Tuesday or
9:40 – 11:40
Wednesday (Jan.85
Jan.9) after the
THIRD DAY
break.
7:30 – 9:30
th
December 18
6th PERIOD EXAM
Review 1st – 5th period
and 7th
December 19
2nd PERIOD EXAM
4th PERIOD EXAM
period reviews
9:40 – 11:45
December 20
3rd PERIOD EXAM
5th PERIOD EXAM
FOURTH DAY
7:30 - 9:30
9:40 - 11:45
December 21
1st PERIOD EXAM
7th PERIOD EXAM
Qualitative v. Quantitative Data
 Qualitative → Quality
 Data can be observed
but not measured;
descriptions
 Colors, textures,
smells, tastes,
appearance, beauty,
etc.
 Quantitative →
Quantity
 Data can be
measured; numbers
 Length, area, volume,
weight, speed, time,
temperature, cost,
members, ages, etc.
 Concept of metric units and when to
use
 Metric prefixes based on powers of
ten, so it’s easy to convert between
units.
 Remember:KING HENRY DIED BY
DRINKING CHOCOLATE MILK
How to use
Kilo
Hecto
Deka
BASE
Deci
Centi
Milli
 Density (gizmo)
 D=m/V
 Volume by displacement
Scientific Notation
 This is an easy way to express really
large or really small numbers
conveniently. The general format for
numbers expressed this way is
some number x 10
some power
Try It!
Express in scientific
notation:
a) 61,500
b) 0.0000568
c) 321
d) 64,960,000
e) 0.07085
Express in standard
notation:
1. 1.09 x 103
2. 4.22715 x 108
3. 9.004 x 10-2
4. 3.078 x 10-4
Accuracy and Precision
 Accuracy: how close a
measurement is to the true value (the
“correct answer”)
 Precision: how close a value is to
other values in that series
Are the following groups of measurements
accurate, precise, both, or neither?
1) Given: true mass of sample of zinc is 14.5 g
Measurements made:
13.2 g, 15.6 g, 17.9 g, 12.0 g
2)Given: true volume of sample of water is
33.3mL
Measurements made:
22.4 mL, 22.2 mL, 22.4 mL, 22.3 mL
3) Given: true length of copper wire is 58.5 cm
Measurements made:
58.4 cm, 58.5 cm, 58.5 cm, 58.4 cm
Significant Figures –
Atlantic/Pacific Rule
Absent
Present
 If the decimal point is
present, start
counting digits from
the Pacific (left) side,
starting with the first
non-zero digit.
 If the decimal point is
absent, start counting
digits from the
Atlantic (right) side,
starting with the first
non-zero digit.
Try It: How many sig figs?
a)
b)
c)
d)
e)
f)
g)
h)
i)
0.0203
2.50
2500
3.7 x 109
45009
100.
34000.00
0.0600
100
a)
b)
c)
d)
e)
f)
g)
h)
i)
3
3
2
2
5
3
7
3
1
Addition/Subtraction
 Calculated value
cannot be more
precise than the least
precise quantity used
in the calculation.
 The least precise has
the fewest digits to
the right of the
decimal point.
 calculated value will
have the same
number of digits to
the right of the
decimal point as the
least precise quantity.
Example
32.01 m
+ 5.325 m
+ 12 m
49.335 m
BUT report as 49 meters.
Try It!
a) 2.311 g - 2.11 g
b) 37.438 cm
– 6.50 cm
a) 0.201 report as
0.20 g
b) 30.938 report as
30.94 cm
Multiplication/Division
 The number of
significant figures
in the final
calculated value
will be the same as
that of the quantity
with the fewest
number of sig
figs used in the
calculation.
Example
 15/3.155=4.75435
but is reported as
4.8 (2 sig figs)
 5.60 x 7.102
=39.771
reported as 39.8
(3 sig figs)
Try It!
a) 7846 X 92437 X
235.649 X 3300=
b) 583.00 ÷ 83=
c) (57.6 X 3) ÷ (34 X
3.00 X 87.507)=
d) (6.10 X 107 ) + (3
X 107 )=
a) 560000000000000
or 5.6 X 1014
b) 7.0
c) 0.02
d) 9 X 107
Dimensional Analysis
 Find a relationship
(or set of
relationships)
between units
 Cancel out units
until only desired
units are left
 Then do the math
 Given: Unit #1
 Desired: Unit #2
Unit #1
Unit #2
Unit #1
Try It!
Important Conversion Factors
60 seconds = 1 minute
60 minutes = 1 hour
1 mile = 5280 feet
1 foot = 12 inches
2.54 centimeters = 1 inch
100 centimeters = 1 meter
1. How many centimeters are in
2.
3.
4.
5.
6.00 inches?
If it takes 2.5 minutes to
complete a task, what is
that same length of time in
seconds?
Express 24.0 cm in inches.
If a container of water
absorbs 3.4 cal of heat,
what is the amount of
energy absorbed (in
joules)?
How many seconds are in
2.0 years?
1.
2.
3.
4.
5.
3