Unit 1- Laboratory & Measurement
Guage Reading
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2
3
4
5
Practice
1. Find the length in cm: ________________
2. Read the volume of the graduated cylinder in ml:____________________
3. What volume of transferred solution should be reported:____________________
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4. The beakers below have different precisions
You pour the water from these three beakers into one container.
What is the volume in this container reported to the correct number of significant figures?
A. 78.817 ml
B. 78.82 ml
C. 78.8 ml
D. 79 ml
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Precision
and
Accuracy
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9
10
11
12
Practice
1. The boiling point of a liquid was measured in the lab, with the following results:
The actual boiling point of the liquid is 28.7oC. The results of the determination of the
boiling point are:
A. accurate and precise
B. precise but inaccurate
C. accurate but imprecise
D. inaccurate and imprecise
2. _________ is the agreement of a particular value with the true value
A. accuracy
B. precision
C. certainty
D. systematic error
3. ________ reflects the reproducibility of a given type of measurement
A. accuracy
B. precision
C. random error
D. certainty
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4. A measurement was taken three times. The correct measurement was 98.0 ml. Circle
whether the set of measurements is accurate, precise, both, or neither.
i.
78.1ml, 43.9ml, 2.0ml
accurate
precise
both
neither
ii.
68.1ml, 68.2ml, 68.0ml
accurate
precise
both
neither
iii.
98.0ml, 98.1ml, 97.9ml
accurate
precise
both
neither
iv.
72.0ml, 55.3ml, 68.1ml
accurate
precise
both
neither
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Density Calculation
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16
17
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Practice
1. Density, Mass & Volume: Show work for calculation set-ups.
i.
m = 1.01g, V = 4.53 ml. Find the density.
Answer:______________________
ii.
d = 2.36 g/cm3, V = 9.9 cm3. Find the mass.
Answer:______________________
iii.
m = 6.91 g, d = 16.1 g/ml. Find the volume.
Answer:______________________
2. Anthony measured 24.1 ml of water in a graduated cylinder. He put a piece of metal
with a mass of 29.18 g into the graduated cylinder. He read the volume of the water
with the metal in it as 38.9 ml.
i.
What is the volume of the metal?
ii.
What is the density of the metal?
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