Chapter 2 Abigail Flashcards
The base unit of length in the SI System is the
meter
The exactness of a measurement in indicated by its number of -
a) accurate digits
b) algorithms
c) conversation factors
d) significant digits
D - significant digits
The SI Prefix meaning “one thousand” is
a) centi
b) kilo
c) milli
d) nano
B - kilo
The units used to express measurements such as speed, area, and volume are called ____ units.
a) precise
b) derived
c) significant
d) basic
B - derived
Which of the following is NOT required in order to make a measurement?
a) a method of making a comparison
b) a standard with which to compare what is being measured
c) knowledge of exactly what is to be measured
d) units that are based on the English system of measurement
D - Units that are based on the English system of measurement
The SI base unit for the measurement of mass is the
kilogram
A balance is used to determine the -
a) mass of an object
b) length of an object
c) density of an object
d) temperature of an object
A - mass of an object
Which metric unit is most appropriate for measuring the distance between Tuscaloosa, AL and Carrollton, AL -
a) meter
b) millimeter
c) kilometer
d) megameter
C - kilometer
The base unit of time in the SI system is
second
Write in scientific notation:9 367 421
9.367421 X 10(6) (can’t make superscripts so the (6) should really be a superscript. Same throughout all these notecards
810 540 - scientific notation
8.10540X 10 (2)
0.00112 - scientific notation
1.12 X 10(-3)
0.7210 - scientific notation
7.210 X 10(-1)
0.1000003030 - scientific notation
1.000003030 X 10(-1)
87.073 meters - round to three sig figs
87.1 meters
4.3621 X 10(8) meters - round to three sig figs
4.36 X 10(8) meters
0.015 52 meter - round to three sig figs
.0155 meters
9009 meters - round to three sig figs
9010 meters
1.777 X 10(-3) meter - round to three sig figs
1.78 X 10(-3) meters
629.55 meters - round to three sig figs
6.30 X 10(2) m
2.30m X 3.65m X 0.55m =
round off the answers to the correct number of sig figs
4.6 m(3)
61.2m + 9.35m + 8.6m =
round off answers to the correct number of sig figs
79.2 m
34.61kg - 17.3 kg =
round answers to the correct number of sig figs
17.3 kg
12.011ng X 6.02X10(23)ng =
round answers to the correct number of sig figs
7.23X10(24) ng(2)
0.500s/44.02s =
round answers to the correct number of sig figs
0.0114
10 434 mL - 9.3344 mL =
round answers to the correct number of sig figs
10425 mL
45.5g = ____________mg
4.55 X 10(4)
103.8m/31s =
round off answers to the correct number of sig figs
3.3 m/s
49g = _________ kg
4.9 X 10(-2) kg
1.60 mL = ____________microliters
1.60 X 10(3) microliters
5.2 cm = __________ mm
52 mm
209 nm = ___________m
2.09 X 10(-7) m
The process of assuring the accuracy of a measuring device
calibration
When you convert to _____________, you remove the placeholder zeros.
scientific notation
method of problem solving that uses conversion factors
dimensional analysis
When dividing numbers in scientific notation, what do you do with the exponents?
subtract them
T/FAnswers should have no more significant figures than the data with the fewest significant figures.
True
Example: if calculating density and the mass has 4 significant figures and volume has three, then the answer should have no more than three significant figures
Expresses a number as a multiple of two factors: a number between 1 and 10 and ten raised to a power or an exponent
scientific notation
The number of known digits in a measurement plus one estimated digit
significant figures
Put these in order from largest to smallest -
centi, giga, kilo, mega, milli, nano, pico
giga mega kilocentimillinanopico
list symbol and factor that each represent
a) centi
b) kilo
c) milli
a) c; 1/100b) k; 1000 c) m; 1/1000
What is the difference between a base unit and a derived unit?
Base units are defined units based on specific objects or events in the physical world. Derived units are defined by combining base units.
A factor of equivalent values used to express the same quantity in different units is -
conversion factor
What is a method of problem solving that often uses conversion factors
dimensional analysis
The digits reported in an answer are called
significant figures
The numeral 9.66 has three significant figures, two known figures and one ______figure
estimated
All final ___________to the right of the decimal place are significant.
zeros
_______ numbers are always significant
non-zero
Zeros that act as ________ are not significant.
placeholders
__________ have an infinite number of significant figures.
Counting numbers
When you convert to _____________, you remove the placeholder zeros.
scientific notation
When multiplying numbers in scientific notation, what do you do with the exponents?
add them
When dividing numbers in scientific notation, what do you do with the exponents?
subtract them
T/FAnswers should have no more significant figures than the data with the fewest significant figures.
TrueExample: if calculating density and the mass has 4 significant figures and volume has three, then the answer should have no more than three significant figures
