CHEM 121 FINAL EXAM Questions and
Answers | 2026 Updated Practice
Questions | Grade A+
• An element cannot ________. -✓✓be separated into other substances by chemical
means
• Which of the following is an illustration of the law of constant composition? -✓✓Water
is 11% hydrogen and 89% oxygen by mass.
• Which one of the following is often easily separated into its components by simple
techniques such as filtering or decanting? -✓✓heterogeneous mixture
• The internal color change of leaves by plants in the fall season is considered to be an
example of what type of process in the properties of matter? -✓✓chemical change
• When we say that the melting point of lead is higher than that of aluminium, are we
talking about an extensive or intensive property? -✓✓intensive
• Is the separation method used in brewing a cup of coffee best described as distillation,
filtration, or chromatography? -✓✓filtration
• Which separation method is better suited for separating a solution of salt and water
into pure substances, filtration or distillation? -✓✓distillation
• Which change will lead to a larger change in the kinetic energy of an object, doubling
its mass or doubling its speed? -✓✓doubling its speed
• A roller coaster is brought from the starting point to the peak of the first rise at 100 off
the ground.
potential energy increase or decrease? -✓✓increase
• A bond in an ozone molecule, O3, is broken to form an oxygen radical and an oxygen
molecule. Potential energy increase or decrease? -✓✓increase
• The distance between two positively charged particles is decreased. Potential energy
increase or decrease? -✓✓increase
• 3.2 cm3 = 0.0032 L. true or false? -✓✓false
• Express the temperature, 392.66 K, in degrees Celsius. -✓✓119.51 °C
, • The temperature of -107 °C is ________ in kelvins. -✓✓166
• What decimal power does the abbreviation d represent? -✓✓1 × 10^-1
• An object measuring 0.6500 kilograms will have a mass of ________ grams. -
✓✓650.0
• An object measuring 77 milliliters will have a volume of ________ liters. -✓✓.077
• An object measuring 0.74 decimeters will have a length of ________ centimeters. -
✓✓7.4
• The width, length, and height of a large, custom-made shipping crate are 1.05m,
2.75m, and 0.83m, respectively. The volume of the box using the correct number of
significant figures is ________ m3. -✓✓2.4
• The density of silver metal bar is 10.5 g/cm3 and it occupies a volume space of 0.5L.
What is its mass in kilograms (kg). -✓✓5.25 kg
• How many μg are there in 7 mg? -✓✓7000
• The density of titanium metal is 4.51 g/cm^3 at 25 ∘C. What mass of titanium displaces
65.4 mL of water at 25 ∘C? -✓✓295g
• The correct answer (reported to the proper number of significant figures) to the
following is ________.
12.5 × 9.68 = ________ -✓✓121
• How many significant figures does the number 0.51 have? -✓✓2
• The number 0.0001000 has ________ significant figures. -✓✓4
• Round the number 0.000200 to two significant figures. -✓✓0.00020
• The estimated costs for remodelling the interior of an apartment are: three 1-gallon
cans of paint at $13.69 each, two paint brushes at $9.53 each, and $135 for a helper.
The total estimated cost with the appropriate significant figures is $________. -✓✓195
• Round the following number to four significant figures and express the result in
standard exponential notation: 25.662 × 10^2 -✓✓2.566 × 10^3
Answers | 2026 Updated Practice
Questions | Grade A+
• An element cannot ________. -✓✓be separated into other substances by chemical
means
• Which of the following is an illustration of the law of constant composition? -✓✓Water
is 11% hydrogen and 89% oxygen by mass.
• Which one of the following is often easily separated into its components by simple
techniques such as filtering or decanting? -✓✓heterogeneous mixture
• The internal color change of leaves by plants in the fall season is considered to be an
example of what type of process in the properties of matter? -✓✓chemical change
• When we say that the melting point of lead is higher than that of aluminium, are we
talking about an extensive or intensive property? -✓✓intensive
• Is the separation method used in brewing a cup of coffee best described as distillation,
filtration, or chromatography? -✓✓filtration
• Which separation method is better suited for separating a solution of salt and water
into pure substances, filtration or distillation? -✓✓distillation
• Which change will lead to a larger change in the kinetic energy of an object, doubling
its mass or doubling its speed? -✓✓doubling its speed
• A roller coaster is brought from the starting point to the peak of the first rise at 100 off
the ground.
potential energy increase or decrease? -✓✓increase
• A bond in an ozone molecule, O3, is broken to form an oxygen radical and an oxygen
molecule. Potential energy increase or decrease? -✓✓increase
• The distance between two positively charged particles is decreased. Potential energy
increase or decrease? -✓✓increase
• 3.2 cm3 = 0.0032 L. true or false? -✓✓false
• Express the temperature, 392.66 K, in degrees Celsius. -✓✓119.51 °C
, • The temperature of -107 °C is ________ in kelvins. -✓✓166
• What decimal power does the abbreviation d represent? -✓✓1 × 10^-1
• An object measuring 0.6500 kilograms will have a mass of ________ grams. -
✓✓650.0
• An object measuring 77 milliliters will have a volume of ________ liters. -✓✓.077
• An object measuring 0.74 decimeters will have a length of ________ centimeters. -
✓✓7.4
• The width, length, and height of a large, custom-made shipping crate are 1.05m,
2.75m, and 0.83m, respectively. The volume of the box using the correct number of
significant figures is ________ m3. -✓✓2.4
• The density of silver metal bar is 10.5 g/cm3 and it occupies a volume space of 0.5L.
What is its mass in kilograms (kg). -✓✓5.25 kg
• How many μg are there in 7 mg? -✓✓7000
• The density of titanium metal is 4.51 g/cm^3 at 25 ∘C. What mass of titanium displaces
65.4 mL of water at 25 ∘C? -✓✓295g
• The correct answer (reported to the proper number of significant figures) to the
following is ________.
12.5 × 9.68 = ________ -✓✓121
• How many significant figures does the number 0.51 have? -✓✓2
• The number 0.0001000 has ________ significant figures. -✓✓4
• Round the number 0.000200 to two significant figures. -✓✓0.00020
• The estimated costs for remodelling the interior of an apartment are: three 1-gallon
cans of paint at $13.69 each, two paint brushes at $9.53 each, and $135 for a helper.
The total estimated cost with the appropriate significant figures is $________. -✓✓195
• Round the following number to four significant figures and express the result in
standard exponential notation: 25.662 × 10^2 -✓✓2.566 × 10^3
