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chem121 midterm Questions and
Correct Answers/ Latest Update /
Already Graded
An object with a mass of 0.255 kg and density of 2.89 g/cm3
measures 34 mm in length and 46 mm in width. What is the height of
the object?
Ans: 5.6 cm
A 0.150 kg metallic block measures 25.0 mm in length, 43.0 mm in
width, and 19 .0 mm in height. What is the density of the metallic
block in g/cm3?
Ans: 7.34 g/cm3
How would you determine the density of an irregular object?
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Ans: D = m/v, so measure the mass of the object using a balance. Then
to find volume, fill a graduated cylinder with a known amount of water
and immerse the object in the water. The amount of displaced water is
the volume in cm3 or mL
What is the base unit for length in the metric system?
Ans: m
What is the base unit for mass in the metric system?
Ans: kg
What is the base unit for volume in the metric system?
Ans: L
It is important that scientists use units that are understood on a global
level. These units are referred to as SI units which stands for _____
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Ans: international system of units
An experimental mouse weighs about 4.41 x 10-2 lbs. What would
the weight be in the SI unit for mass?
Ans: 0.0200 kg*
Accuracy is defined as how close a measured value comes to a
_____.
Ans: true value
Precision is defined as how _____ the measured values are to one
another.
Ans: reproducible
Structural isomers are considered molecules with the same
____________.
chem121 midterm Questions and
Correct Answers/ Latest Update /
Already Graded
An object with a mass of 0.255 kg and density of 2.89 g/cm3
measures 34 mm in length and 46 mm in width. What is the height of
the object?
Ans: 5.6 cm
A 0.150 kg metallic block measures 25.0 mm in length, 43.0 mm in
width, and 19 .0 mm in height. What is the density of the metallic
block in g/cm3?
Ans: 7.34 g/cm3
How would you determine the density of an irregular object?
,2 | Page
Ans: D = m/v, so measure the mass of the object using a balance. Then
to find volume, fill a graduated cylinder with a known amount of water
and immerse the object in the water. The amount of displaced water is
the volume in cm3 or mL
What is the base unit for length in the metric system?
Ans: m
What is the base unit for mass in the metric system?
Ans: kg
What is the base unit for volume in the metric system?
Ans: L
It is important that scientists use units that are understood on a global
level. These units are referred to as SI units which stands for _____
, 3 | Page
Ans: international system of units
An experimental mouse weighs about 4.41 x 10-2 lbs. What would
the weight be in the SI unit for mass?
Ans: 0.0200 kg*
Accuracy is defined as how close a measured value comes to a
_____.
Ans: true value
Precision is defined as how _____ the measured values are to one
another.
Ans: reproducible
Structural isomers are considered molecules with the same
____________.
