-
Arrange from smallest to largest:
milliliter, gigaliter, microliter
- microliter
- milliliter
- gigaliter
-
Arrange from smallest to largest:
centigram, megagram, decigram
- centigram
- decigram
- megagram
-
Arrange from smallest to largest:
micrometer, picometer, kilometer
- picometer
- micrometer
- kilometer
-
Arrange from smallest to largest:
nanoliter, milliliter, centiliter
- nanoliter
- milliliter
- centiliter
-
A classroom contains 63 students.
a) exact number
b) inexact number
a) exact number
-
The car is traveling at a speed of 56 miles per hour.
a) exact number
b) inexact number
a) exact number
-
The temperature on the back porch is -3 degrees F.
a) exact number
b) inexact number
a) exact number
-
There are 3 feet in a yard.
a) exact number
b) inexact number
- b) inexact number
- (it is impossible to make an exact measurement)
-
Determine the number of significant figures:
23,009
5
-
Determine the number of significant figures:
0.00231
3
-
Determine the number of significant figures:
0.3330
4
-
Determine the number of significant figures:
73,000
2
-
Determine the number of significant figures:
73.000
2
-
Determine the number of significant figures:
0.40040
5
-
Round off to 3 significant figures:
327.123
327
-
Round off to 3 significant figures:
3.6007
3.60
-
Round off to 3 significant figures:
0.4567
0.457
-
Round off to 3 significant figures:
04563
456
-
Convert to scientific notation:
167,281.0
1.67281 x 10^5
-
Convert to scientific notation:
0.006024
6.024 x 10^-3
-
Convert to scientific notation:
19 x 10^-11
1.9 x 10^-11+1 = 1.9 x 10^-10
-
Convert to scientific notation:
502.6 x 10^2
5.026 x 10^2+2 = 5.026 x 10^4
-
What is the value of this scientific notation?
2.6 x 10^5
260,000
-
What is the value of this scientific notation?
1.098 x 10^-3
0.001098
-
Express in scientific notation:
37.22
3.722 x 10^1
-
Express in scientific notation:
34.000
3.4000 x 10^1
-
Express in scientific notation:
234,000
2.34 x 10^5
-
giga- G
mega- M
kilo- k
deci- d
centi- c
milli- m
micro- u
nano- n
pico- p
- giga- 10^9
- mega- 10^6
- kilo- 10^3
- deci- 10^-1
- centi- 10^-2
- milli- 10^-3
- micro- 10^-6
- nano- 10^-9
- pico- 10^-12
-
What is the higher temperature -15degC or 4degF?
-15degC
-
Air has a density of 1.29 g/L at room temp.
Woud Helium gas (density = 0.18 g/L) rise or sink?
- rise
- (Helium density is less then air density)
-
Air has a density of 1.29 g/L at room temp.
Would Argon gas (density = 1.78 g/L) rise or sink?
- sink
- (Argon gas density is more than air density)
-
Water has a density of 1.0 g/cm3 at room temp.
Would Paraffin wax (density = 0.90 g/cm3) sink or float?
- float
- (Paraffin wax has less density than water density)
-
Water has a density of 1.0 g/cm3 at room temp.
Would Limestone (density = 2.8 g/cm3) wink or float?
- sink
- (Limestone density is more than water density)
-
Mass
amount of matter in an object (gram, pound, ton)
-
Volume
- amount of space an object occupies (cm3, mL, Gal, L, in3)
- temperature dependent
- 1.00 gal = 3.77 L
- 1.00 mL = 1.00 cm3
- Length: 1.00 in = 2.54 cm
-
Kilogram (kg)
- base unit of mass
- 1889 international prototype of the kilogram is a 39 mm cylinder made of 90% platinum and 10% iridium
- independent of temperature
-
Exact numbers
- Definitions - 12 objects in a dozen
- Counting - 15 pretzels in a bowl
- Simple fractions - 1/2 or 3/4
Infinite number of sig figs
-
Significant Figures
"Sig Figs"
- Zeros located at the beginning of a number are NEVER significant
- Zeros located between nonzero digits are ALWAYS significant
- Zeros located at the end of a number are significant only if the number has an explicitly shown decimal point
-
How many sig figs?
a) 3456
b) 0.048
c) 16.07
d) 9.300
e) 150
- a) 4
- b) 2 (leading zeros do not count)
- c) 4
- d) 4 (following zeros count if number contains a decimal point)
- e) 2 (following zeros don't count because the number does not contain a decimal point -- in this case write in scientific notation -- 1.5 x 10^2)
-
When multiplying exponential terms what do you do with the exponents?
a) add
b) subtract
a) add
-
When dividing exponential terms what do you do with the exponents?
a) add
b) subtract
b) subtract
-
Mass Unit Conversions
- 1.00 lb = 454 g
- 1.00 kg = 2.2046 lbs
- 1.00 oz = 28.3 g
-
Mass vs. Weight
- Weight = mass X gravity
- Analytical scale measures the force needed to counter sample (weight) and the acceleration of gravity. Then it solves the expression for mass which is displayed.
- mass = weight / acceleration due to gravity
- be careful of static electricity, tilting the balance, vibrations
-
Density
- Density = Mass / Volume
- dependent on pressure and temperature
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