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Measurement & Problem Solving Review
Kilo-
1,000 Hecto-
100 Deka-
10 Base Unit
m, L, g,sDeci-
0.1 Centi-
0.01 Milli-
0.001
_______________ measurement is a measurement that gives results in a
definite form, usually in numbers and units
• Quantitative
What formula is used to calculate percent error?
Valueaccepted – Valueexperimental X 100
Valueaccepted
______________ measurement is a measurement that gives descriptive,
NONnumeric results
• Qualitative
The zinc was a solid, gray metal. What type of measurement is this (qualitative or quantitative)?
• qualitative
Describe the proper way to read a measurement from a graduated
cylinder.
• Eye level• Bottom of meniscus
Write out the metric prefix conversion chart.
Kilo-
1,000 Hecto-
100 Deka-
10 Base Unit
m, L, g,sDeci-
0.1 Centi-
0.01 Milli-
0.001
The curvature of a liquid in a container because of surface tension is known as
the __________
• meniscus
_________________ shows how close a measurement comes to the true or accepted value of what is measured
• accuracy
Suppose you wanted to find the volume of a penny. What would you do?
• Water Displacement- fill a graduated cylinder with water. Record volume. Add penny. Record volume. Take the difference between the volumes and that would be the volume of the penny!
The zinc had a mass of 58.3g. What type of measurement is this (qualitative or quantitative)?
• quantitative
Aluminum has a mass of 13.5g and a volume of 5.25mL. Calculate the
density of this piece of aluminum.
D = _M_ V = __13.5g__ 5.25mL= 2.57g/mL
Aluminum has a density of 2.669g/mL. Suppose a student measures the
volume to be 3.2mL. Calculate the mass of this piece of aluminum.
• M = DV• M = (2.669g/mL)(3.2mL) = 8.54g
A chemistry student mixes rubbing alcohol, water, and honey in a beaker. She noticed that the honey is at the bottom of the beaker, the water is in the middle and
the rubbing alcohol is at the very top. Explain this observation in relation to the relative densities of
rubbing alcohol, water, and honey.
• Rubbing alcohol is less dense than water since it is on top of the water.• Honey is more dense than water since it is
on the bottom of the beaker.
Aluminum has a density of 2.669g/mL. Suppose a student measures the mass to be 14.3g. Calculate the volume of
this piece of aluminum.
V = _M_ D= __14.3g__ 2.669g/mL
= 5.36 mL
Ryan measured a piece of aluminum to be 12.21g. The mass of the aluminum was actually 12.989g. Calculate the
percent error
12.12g-12.989g x 100 12.989g
= 6.7%
A student measured the volume of an aluminum block three times and recorded the following
results: 6.42cm3, 6.41 cm3, and 6.40 cm3. The actual volume of the aluminum was 12.5 cm3. Comment on
the accuracy and precision of the data.
• The student was precise – all 3 measurements are close to one another.• The student was NOT accurate- she is about 6
cm3 from the actual measurement of 12.5 cm3