Transcript File

Metrics, Significant
Figures, Conversions, and
Density
Review! YEAH!
How Many Significant Figures Do
I Have?
 3.12050
6
• 0.0101010100
•9
 4.05
3
• 300
•1
 0.0020
2
• 300.
•3
Question Two
457
km = ________
cm
Move decimal 5 to the
right: 45,700,000
Question Three
14.6
yards = ____ ft
14.6 yds x 3ft/1yd =
43.8 ft
Question Four
Add,
using correct
significant figures
3.492 + 0.303 + 30.30
34.10
Question Five
37,854,120
mL =
______ L
Move decimal 3 to the
left, 37854.12 No
zero because of sig
figs
Question 6
If
the mass of an object
is 124.589 grams and the
3
density is 2.45 g/cm ,
what is the volume of
the object?
124.589/2.45 = 50.9
3
cm
Question 7
30,833
Move
mg = ____ kg
decimal six to the left
0.030833 kg
Question Eight
5
mL = _____ mL
Move
decimal 3 to the left
0.005 mL
Question Nine
The
density of an object
3
is 1.56 g/cm . What is
the mass of this object
when the volume is 12
L?
Convert
12L  mL
1.56 x 12,000 = 19,000 g
Question Ten
1.25
s
1.25
days = _______
days x 24 hours x 60
min x 60 sec = 108000 s
Question Eleven
If
I am measuring with a
ruler in centimeters, how
many digits past the
decimal should I record?
2
Question Twelve
How
do I find the
volume of a
rectangular solid?
L
xWxH
Question Thirteen
I
took the mass of a block of
wood. The mass was 198 mg.
I then measured the block and
it was 14 cm wide, 3 cm high,
and 17 cm long. What is the
density of the wood?
Multiply
L x W x H to get volume
0.198/714 = 0.0003 g/cm3
Question Fourteen
160
2
km
Normally
= _____
2
m
you would move
three to the right, but since
it’s squared you’d do that
twice… so 6 to the right
1.6 x 108 m2
Question Fifteen
156
3
cm
Normally
= _____
3
m
you would move
two to the left, but since it’s
cubed, you do that three
times, so move six to the left
1.56 x 10-4 m3
Question Sixteen
One
of the largest gold
nuggets ever discovered was
found in Australia in 1872.
The nugget had a mass of 286
kg. Given that 19.32 g/cm3 is
the density of gold, calculate
the volume of this nugget
Convert
286kg  286000 g
286000 / 19.32 = 14800 cm3
Question Seventeen
I
am measuring the length of a
stirring rod and I get: 1.25 cm,
12.8 mm, and 0.129 m. The
actual length of the stirring rod is
19.3 cm. Am I accurate? Am I
precise?
 You
are not accurate because you did not
get the correct number. You are also not
precise because all measurements are not
close to each other when converted.
Question Eighteen
I
am measuring the mass of
sodium chloride for an
experiment. I obtain a
measurement of 12.236 mL.
What is wrong with the way
I have reported this value?
Mass
should be in units of grams,
not milliliters
Question Nineteen
48°C
°F
= _____°F
= 9/5°C + 32
9/5*48+32 = 120°F
Question Twenty
115°F
°C
= ______ K
= 5/9(°F -32)
5/9(115-32) = 46.1°C
K = °C + 273
46.1 + 273 = 319 K
Question Twenty - One
Express
125,000,000,000 in
scientific notation
1.25
x 1011
Question Twenty Two
Express
0.0000008 in
scientific notation
8
x 10-7
Question Twenty Three
What
is 4.869 x
decimal notation?
486,900
5
10
in
Question Twenty Four
What
is 5.21 x
in
decimal notation?
0.000521
-4
10
Question Twenty Six
298
K = ____°F
298K-273
= 25°C
9/5(25)+32 = 77.0°F
Question Twenty seven
How
many significant
figures do I have?
12,000,000
2
Question Twenty Eight
How
many significant
figures do I have?
10.0
3
Question Twenty Nine
A
sample has a
volume of 12.5 L and a
mass of 25.8 kg. What
is its density in g/L?
25,800/12.5
= 2060 g/L
Question Twenty Nine
A
student finds the density
of carbon monoxide to be
1.62 g/cm3. The accepted
value is 1.12 g/cm3. What
is the percent error?
|1.12-1.62|
/ 1.12 x 100 = 44.6%
Question Thirty
One
inch = 2.54 cm
15.869
15.869
3
cm
= ____
3
in
cm x 1/2.54 x 1/2.54
3
x 1/2.54 = 0.96839 in
Question Thirty One
If
I am driving in a car at 65
miles/hour, what is my
speed in meters/second
1 mile = 1.6 km
65
miles x 1.6 km/mile x 1000
m/km x 1hr/60min x 1min/60 sec
= 29 m/s
Question Thirty Two
I
am measuring the mass of
calcium chloride for an
experiment. I measure the
mass three times, obtaining
values of 125.46 g, 0.12455
kg, 124,999 mg. The actual
mass is 1.25 x 108 mg. Am I
accurate? Am I precise?
You
are both accurate and precise
Question Thirty Three
I
measure the volume of a
liquid to be 124.56 mL. The
actual volume is 12.8 cL.
What is my percent error?
Convert
to the same unit first!
|12.8 – 12.456| / 12.8 x 100 =
2.69%
Question Thirty Four
Convert
6.5 x
7
10
nm
to cm.
Nano
to centi is seven to the
left
6.5 cm
Question Thirty Five
87
2
mm
mm
= ____
2
dm
to dm is usually two
steps to the left. Since it’s
squared, you’ll move four
spots to the left.
0.0087
Question Thirty Six
Add,
figs
using proper sig
5.0385
28.1
+ 8.9 + 14.203 =
Question Thirty Seven
The
density of an object
3
is 5.46 g/cm . Calculate
the volume, in liters, of
an object that has a
mass of 540 mg.
9.9
x 10-5 L
Question Thirty Eight
The
mass of an object is
65 dg. The density of the
object is 4.392 g/L.
What is the volume of
the object in mL?
1500
mL
Don’t
forget to study
your equipment and
reading equipment!!