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Chapter 2
Conversions, Density, Mass & Volume
43
Chemistry
10th Grade
02/10/2010

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Term
ACCURRACY
Definition
Describes how close the measurement comes to the true value.
Term
PRECISSION
Definition
Depends on a measurements reproducibility.
Term
METER
Definition
Basic unit of length in the metric system.
Term
VOLUME
Definition
Space occupied by matter.
Term
LITER
Definition
The Space taken up by a cube that is 10cm on each edge.
Term
MATTER
Definition
The quantity that determines a objects mass.
Term
WEIGHT
Definition
A measure of the pull of gravity on an object of given mass.
Term
GRAM
Definition
The mass of one cubic centimeter of water at 4*C is one...
Term
DENSITY
Definition
The ratio of the mass of an object to its volume.
Term
SPECIFIC GRAVITY
Definition
The comparison of the density of a substance to the density of a reference substance.
Term
HYDROMETER
Definition
Typically used to measure specific gravity.
Term
CELSIUS SCALE
Definition
Freezing point of water is 0 degrees.
Term
BOILING POINT OF WATER ON CELSIUS SCALE
Definition
100 degrees.
Term
KELVIN
Definition
Another scale used in scientific work.
Term
273
Definition
To convert readings on the Celsius scale to e Kelvin Scale this number is added to the Celsius reading.
Term
WHAT DEPENDS THE ACCURRACY OF A MEASUREMENT?
Definition
The quality of the measuring instrument.
Term
ACCEPTED VALUE
Definition
The true or correct value based on references.
Term
EXPERIMENTAL VALUE
Definition
Determined by measurements made during an experiment.
Term
ERROR
Definition
The difference between the accepted value and the experimental value.
Term
QUANTITATIVE MEASUREMENTS
Definition
Give results in a definite form, usually as numbers.
Term
ZEROS AT THE END OF A MEASUREMENT AND TO THE LEFT OF THE DECIMAL POINT ARE NOT SIGNIFICANT.
Definition
Always true.
Term
SIG FIG'S INCLUDE ALL THE DIGITS THAT CAN BE KNOWN ACCURATELY PLUS A LAST DIGIT THAT MUST BE ESTIMATED.
Definition
Always true.
Term
THE SI BASE UNIT OF MASS MEASUREMENT IS THE?
Definition
GRAM OR KILOGRAM.
Term
KILOGRAM
Definition
100 times smaller than a gram.
Term
Density can sometimes have units of ?
Definition
Grams per cubic centimeter.
Term
FORMULA OF SPECIFIC GRAVITY
Definition
Density of substance/Density of water(1)=SG
Term
FORMULA FOR DENSITY
Definition
D=Mass/Volume
Term
FORMULA FOR MASS
Definition
M=DxV
Term
Sig Figs
Definition
-Zeros at the end of a measurement are not significant.
-Zeros to the left of the decimal point are not significant.
-Zeros between two sigfigs are significant.
-Zeros to the right of the decimal point that are before sigfigs are not significant(i.e. .0037-2SF's).
Term
THE PAIR WITH MORE SIG FIG'S IS?
Definition
More precise.
Term
HMSF? 0.0010000
Definition
5
Term
HMSF? 456,000
Definition
3
Term
HMSF? 50,060
Definition
4
Term
HMSF? 2.0
Definition
2
Term
HMSF? 173.
Definition
3
Term
HMSF? 0.050500
Definition
5
Term
FORMULA FOR ABSOLUTE VALUE
Definition
AV-EV/AV x 100= %of error
Term
Why doesn't specific gravity have a unit?
Definition
No units cancel out.
Term
Round 7.013g to three sigfigs.
Definition
7.01g
Term
Round off 0.003629mm to three sigfigs.
Definition
.00363mm
Term
What 3 things must measurements have to be valid?
Definition
A,
-Number
-Unit
-Standard
Term
MEASUREMENT
Definition
Process of determining a numeric value for a physical quantity.
Term
Reading the VERNIER CALIPER
Definition
-First Number
-Decimal
-First bottom line(If it falls between two top lines it is the value of the first top line)
-From the first bottom line how many lines over is the aligned/slightly aligned line.
-If the like is perfect the last number is 0. If the line is slightly off the last number will be 5.
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