Measurements/Unit Analysis
Accuracy and Precision
Sig Digs/Scientific Notation
Weight/Mass/Volume/Density
MISC
100
What is the act of comparing an unknown quantity to a standard unit?
Measurement
100
how close you came to the established value
accuracy
100
How many SDs? 205,301.00
8
100
a measure of the earth’s gravity attracting an object
weight
100
If an object is irregular, its volume cannot be calculated from its dimensions. Instead, measure it directly using a _____ _____
graduated cylinder
200
What is a device used to help our senses with measuring?
Instrument
200
how close repeated readings are to each other
precision
200
0.00054 in scientific notation
5.4 x 10^-4
200
One pound equals approximately ____ newtons
5
200
_____ is the SI unit for volume
1 m3
300
What is any factor equal to 1 that consists of a ratio of two units?
Conversion Factor
300
Measurements are NEVER exact, due to …
-the size of instrument markings. -the environment. -observer error. -instrument defects or ?damage.
300
How many SDs? 0.0000000000000000010
2
300
indirectly indicates the amount of matter
mass
300
A _____is the curved surface of a liquid in a container.
meniscus
400
Convert 160 lb to ounces
2560 ounces
400
The following measurements are precise, accurate, or accurate and precise. Measured: 21.2, 21.3, 21.4 Actual: 30.0
precise
400
Calculate to appropriate SDs 401 x 20 x 10
80,000
400
A cubic centimeter is equal to
mL
400
M = 23.9 g V = 7.82 mL ?Find the density.
3.06 g/mL
500
How many seconds are in a week?
604,800 seconds
500
The following measurements are precise, accurate, or accurate and precise. Measured: 29.8, 29.9, 30.0 Actual: 30.0
accurate and precise
500
Calculate to appropriate SDs (1.2 x 10^4)(3.2 x 10^-1)
3840 = 3800
500
measures how heavy an object is for its size
density
500
What is the density of an object with a mass of 876.2 g and a volume of 68.1 mL?
12.9 g/mL
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