Chapter 3 Scientific Measurement Review. Express 0.000 000 000 154 m in scientific notation. 1.54 x 10 -10 m. What is 5928 km expressed in scientific notation?. 5.928 x 10 3 km. What is the result of multiplying (2.5 x 10 10 m ) x (3.5 x 10 -7 m )?. 8.8 x 10 3 m 2. - PowerPoint PPT Presentation
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Chapter 3Scientific Measurement
Review
Express 0.000 000 000 154 m in scientific notation.
• 1.54 x 10-10 m
What is 5928 km expressed in scientific notation?
• 5.928 x 103 km
What is the result of multiplying (2.5 x 1010 m) x
(3.5 x 10-7 m)?
• 8.8 x 103 m2
Which of the following is NOT a quantitative measurement:
5 liters, or very small?
• Very small
The closeness of a measurement to it’s true value
is a measure of …
• accuracy
In the measurement 0.503 L, what digit is not known with
certainty?
3
How many significant figures in the measurement
0.0034 kg?
• 2
How many significant figures in the measurement
40,500 mg?
• 3
How many significant figures in the measurement
811.40 grams?
• 5
Round 111.009 mm to 4 sig. figs.
• 111.0 mm
Record the following measurements with the correct
sig figs.
What is the measurement 1042 L rounded to two
significant figures?
• 1.0 x 103 L
Express the sum of 1111 km and 222 km, using the correct
sig. figs.
• 1333 km
Express the sum of 7.68 m and 5.0 m, using the correct
sig. figs.
• 12.7 m
Express the product of 2.2 mm and 5.00 mm, using
the correct number of significant figures.
• 11 mm
Express the product of (4.0 x 10-2 m) x (8.1 x 102 m)
• 32 m
Which group of measurements is the most
precise? a) 2 g, 2.5 g, 3 g
b) 1 g, 3 g, 4 g
• a
Which is expressed to 3 significant figures: 0.007 m, or
7.30 x 10-7 km
• 7.30 x 10-7 km
Which contains 2 significant figures: 0.004 40 L, or
0.000 44 L
• 0.00044 L
What quantity is represented by the metric system prefix
deci-?
• 0.1
What is the metric system prefix for the quantity
0.000 001
• micro
What is 0.0075 m expressed in cm?
• 0.75 cm
What is 7896 mm expressed in m?
• 7.896 m
A nanosecond is how many seconds: 10-6 s, or 10-9 s?
• 10-9 s
78 Liters is equal to how many cubic centimeters?
• 78 L = 78000 mL
• 78000 mL = 78000 cm3
Express 987 milligrams in grams.
• 0.987 g
The chief advantage of the metric system over other
systems of measurement is that it …
• Uses powers of 10
Which is NOT an official SI unit: kilogram, liter, or mole
• liter
Which of the following is NOT correct: a) 1 cm3 = 1 mL
b) 10 kg = 1 g c) 1000 mm = 1 m
• b
Convert -32°C to Kelvin
241 K
The actual mass of a certain compound is 1.420 g. You
calculate the mass in your lab work as 1.38 g. What is your
percent error?
• 2.82%
Which of the following volumes is the smallest: 1 milliliter, or 1 microliter
• 1 microliter
A rectangular block of lead measures 20.0 mm x 30.0 mm x 45.0mm. If the density of Pb is 11.34 g/cm3, calculate the
mass of the block.
• 306 g
As the mass of a substance increases, the density of a
given volume of that substance ...
• increases
What is the volume of 344 g of ice, if the density is 0.92
g/mL?
• 370 mL
The pressure reading from a barometer is 742 mm Hg.
Express this reading in kilopascals, kPa. (Use
dimensional analysis to solve. 760 mm Hg = 1.013 x 105 Pa)