©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
Chem105 - BYU Final Exam Questions And
Answers |Latest 2025 | Guaranteed Pass.
Define chemistry in 1 sentence. - Answer✔Chemistry is the study of matter including its
composition, structure, properties, and the various changes it undergoes along with the energy
involved in the changes.
What is a Compound? - Answer✔Two different elements are coming together to form a single
substance.
What is a Pure element? - Answer✔One type of atom in the frame.
What is a mixture? - Answer✔More than one element in the frame, but they aren't
compounding.
State the type of matter for saltwater, purified sugar, high pulp orange juice, apple juice,
diamond, gravel, compressed air in a scuba tank, solid butter, baking soda, pure copper
plumbing pipes? - Answer✔Saltwater - homo mix, purified sugar - compound, high pulp orange
juice - hetero mix, apple juice - homo mix, diamond - element, gravel - hetero mix, compressed
air in a scuba tank - homo mix, solid butter - homo mix, baking soda - compound, pure copper
plumbing pipes - element.
What is liquid? - Answer✔defined volume but not defined shape
What is Gas? - Answer✔no defined shape or volume
What is solid? - Answer✔defined shape and volume
What are chemical changes? - Answer✔The diagrams are depicting the alteration of the
identity to two elements at an atomic/molecular level. Mixed elements are combined to create
a single, solid compound of elements (ordered array).
What are physical changes? - Answer✔The diagrams are depicting the alteration of the identity
to two elements at an atomic/molecular level. Mixed elements are combined to create a single,
solid compound of elements (ordered array).
Is this a chemical or physical change: Fish in the fridge smelling more 'fishy' with time? -
Answer✔Chemical - The bacteria on the fish is causing it to break down and decompose into
something else.
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
Is this a chemical or physical change: Muffins baking in your oven? - Answer✔Chemical. The
ingredients within the batter (eggs, baking soda, etc.) are coming together and interacting to
form a new substance
Is this a chemical or physical change: Salt crystals forming on a hot day by the Great Salt Lake? -
Answer✔Physical. Before you have NaC1 in the water, and after they are out of the water.
There is no change in chemical identity.
Is this a chemical or physical change: A spot on your car where the paint was scratched starting
to look brown/red? - Answer✔Chemical. The actual reaction that is occurring is the formation
of rust. This is a metal oxide (Fe2O3) which is forming where the metal used to be positioned.
Is this a chemical or physical change: Soda going 'flat' as dissolved CO2 comes out of solution? -
Answer✔Physical. Before, CO2 was inside the soda. After, it is simply out of the soda and there
is no change to the actual molecular identity of the substance.
Is this a chemical or physical change: Soldering a pipe in your house? - Answer✔Physical. When
you solder a pipe, you are melting and then allowing the binding metal to solidify and bring the
two sides together. There is no change to chemical identity.
Is density a chemical or physical property? - Answer✔physical
Is melting point a chemical or physical property? - Answer✔physical
Is conductivity a chemical or physical property? - Answer✔physical
Is malleability a chemical or physical property? - Answer✔physical
Is tarnishing/rusting a chemical or physical property? - Answer✔chemical
Are reactions chemical or physical properties? - Answer✔chemical
How does a hypothesis differ from a scientific theory? - Answer✔A scientific hypothesis is a
statement or prediction which is testable, however scientific theory is a hypothesis which is
supported by many different sources through numerous experiments. Scientific theories are
concise and well-tested, explaining why a natural phenomenon is observed or why a theory is
true.
How does a hypothesis become a theory? - Answer✔A hypothesis becomes a theory when
there are several experiments which prove its validity. Once it is out of the first revision stage, it
moves through a pattern of theory to experiments to second revision, until there is a final
product theory which is supported by many different sources.
How are energy and work related? - Answer✔Energy is transferred from and through different
objects as work or thermal energy.
Explain the difference between potential and kinetic energy? - Answer✔Potential energy is
energy which is stored in objects due to its makeup or position. Kinetic energy, on the other
hand, is the energy of motion.
2
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
What is precision? - Answer✔Precision: How repeatable/reproducible a measurement/value
and is expressed as a ± range.
What is accuracy? - Answer✔Accuracy: How close to the true value a set of measurements are.
To test the precision and accuracy of weight scale in laboratory, you take a small block that is
known to be exactly 1.000g and weigh it three times on the scale. Three measurements are
reported as follows: 0.843g, 0.842g, and 0.843g. Is this scale precise, accurate, both, or neither?
Explain your choice in 1 sentence. - Answer✔This is scale is precise, but not accurate because it
is not within 1% of the true value of 1.000g.
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 112g, 118g, 106g - Answer✔These
measurements are not precise nor accurate, because they are not close enough to be accurate
and they are not consistent either (not precise)
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 99.7g, 100.1g, 100.2g - Answer✔precise
and accurate, because they are close and consistent
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 110 g, 111 g, 110.5 g - Answer✔precise
but not accurate. They are close together but not near the original value
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 105 g, 93 g, 102 g - Answer✔these
numbers are accurate, because their average is 100g, but they are not precise because they are
too far apart
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 100.5 +/-.2 g - Answer✔these
measurements are precise and accurate, because the reported value is within 1% of the actual
number
How many sig figs are in the following number? 0.0509200 - Answer✔6
Scientific Notation: 124mg+316mg = - Answer✔4.40x10^2mg
Scientific Notation: 613ml + 582 ml = - Answer✔1.20 x 10^3 ml
Scientific Notation: 4x10-3 mL - 2x10-5 mL= - Answer✔4.0 x 10^-3 mL
Scientific Notation: 85 ng x 34 ng= - Answer✔2.9 x 10^3 ng^2
Scientific Notation: 25.34 cm ÷ 1.55x10-4 cm= - Answer✔1.63 x 10^5
Scientific Notation: 6.31x104 pm x 3.536 x 105 pm= - Answer✔2.23 x 10^10 pm^2
Calculate with correct SN and SI: 77.3 g + 41.7 g = - Answer✔119.0g = 0.1190 kg
3
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
Calculate with correct SN and SI: 123.4 Gm - 68.93 Gm = - Answer✔54.50 Gm
Calculate with correct SN and SI: 21.7 cm x 9300 cm2 = - Answer✔200000 cm^3 = .20m^3
Calculate with correct SN and SI: (2.76x103) (7.4x102 ) nL = - Answer✔2.0x10^6 nL = 2.0 x 10^-3
L
Calculate with correct SN and SI: 8.1x10-1 µm -3.7x10-8 µm = - Answer✔8.1 x 10^-1 µm = 8.1 x
10^-7 m
Calculate with correct SN and SI: 387 pg ÷ 2x10-2 mL = - Answer✔19350 pg/mL = 1.935x10^-11
kg/mL = 2x10^5 kg/m^3
Comfortable room temperature is about 72°F. Body temperature is about 98°F. Water freezes
at 32° F and boils at 212°F. The lowest temperature ever recorded at sea level (by a human) was
-128.6°F at the Soviet Vostok Station in Antarctica, on July 21, 1983. Convert these
temperatures to °C and K. - Answer✔T(°𝐶) = (5/9) [𝑇(°F) − 32] 𝑇(°C) = −89.22 → −89.22° C + 273
= 184𝐾
The diameter of a US dime is 17.9mm, and the diameter of a silver atom is 2.88 A. How many
silver atoms could be arranged side-to-side across the diameter of a dime? (10A = 1 nm). -
Answer✔17.9mm x (1m/1000mm) x (1nm/1x10^-9m) x (10 Å /1nm) x (1Ag atom / 2988 Å) =
6.22 x 10^7 Ag atoms
Which of the following represents the largest amount of matter? 3.0 x 10-1 Mg, 4.5 x 102 mg,
1.0 x 107 µg, 2.0 x 108 ng, 2.5 x 1013 - Answer✔3.0 x 10-1 Mg
Lead metal (11.3 x 109 ng/ml), tungsten (0.019 kg/ml), and liquid mercury (13.5 g/cm3 ) are all
very dense. If chunks of lead and tungsten are placed in liquid mercury, will they sink or float?
Does it matter what size the chunks are? Why or why not? - Answer✔Lead 11.3x10^9ng x
(1x10^-9/1ng) = 11.3g/mL Tungsten 0.019kg x (1000g/1kg) = 19g/mL Lead is less dense than
mercury so it will float, while tungsten is denser than mercury, so it will sink. It does not matter
what size the chunks are, because the quality of sinking and floating is determined solely by the
density of the substance.
The price of gold in May was $1,228.40 per ounce (1 ounce = 28.35 g). A typical gold bar such as
those shown here has a mass of 12.4 kg. How much would one of these bars of gold cost? -
Answer✔12.4 kg x (1000g/1kg) x (1oz./28.35g) x ($1228.40/1oz.) = $537,000.
The price of gold in May was $1,228.40 per ounce (1 ounce = 28.35 g). The density of gold is
19.3 g/cm3 . Suppose a certain gold wedding ring displaced 0.55 mL of liquid when dropped in a
glass of sparkling cider. How much did this wedding ring cost (assuming you paid the market
price of gold). - Answer✔D=m/v -- (19.3g/mL) = (m/.55mL) -- M=10.6g -- 10.6g x (1oz./28.35g) x
($1228.40/1oz.) = $460
How many protons, neutrons, and electrons are in 23Na and what is the mass number? -
Answer✔11 protons, 12 neutrons, 11 electrons and 23
4
Chem105 - BYU Final Exam Questions And
Answers |Latest 2025 | Guaranteed Pass.
Define chemistry in 1 sentence. - Answer✔Chemistry is the study of matter including its
composition, structure, properties, and the various changes it undergoes along with the energy
involved in the changes.
What is a Compound? - Answer✔Two different elements are coming together to form a single
substance.
What is a Pure element? - Answer✔One type of atom in the frame.
What is a mixture? - Answer✔More than one element in the frame, but they aren't
compounding.
State the type of matter for saltwater, purified sugar, high pulp orange juice, apple juice,
diamond, gravel, compressed air in a scuba tank, solid butter, baking soda, pure copper
plumbing pipes? - Answer✔Saltwater - homo mix, purified sugar - compound, high pulp orange
juice - hetero mix, apple juice - homo mix, diamond - element, gravel - hetero mix, compressed
air in a scuba tank - homo mix, solid butter - homo mix, baking soda - compound, pure copper
plumbing pipes - element.
What is liquid? - Answer✔defined volume but not defined shape
What is Gas? - Answer✔no defined shape or volume
What is solid? - Answer✔defined shape and volume
What are chemical changes? - Answer✔The diagrams are depicting the alteration of the
identity to two elements at an atomic/molecular level. Mixed elements are combined to create
a single, solid compound of elements (ordered array).
What are physical changes? - Answer✔The diagrams are depicting the alteration of the identity
to two elements at an atomic/molecular level. Mixed elements are combined to create a single,
solid compound of elements (ordered array).
Is this a chemical or physical change: Fish in the fridge smelling more 'fishy' with time? -
Answer✔Chemical - The bacteria on the fish is causing it to break down and decompose into
something else.
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
Is this a chemical or physical change: Muffins baking in your oven? - Answer✔Chemical. The
ingredients within the batter (eggs, baking soda, etc.) are coming together and interacting to
form a new substance
Is this a chemical or physical change: Salt crystals forming on a hot day by the Great Salt Lake? -
Answer✔Physical. Before you have NaC1 in the water, and after they are out of the water.
There is no change in chemical identity.
Is this a chemical or physical change: A spot on your car where the paint was scratched starting
to look brown/red? - Answer✔Chemical. The actual reaction that is occurring is the formation
of rust. This is a metal oxide (Fe2O3) which is forming where the metal used to be positioned.
Is this a chemical or physical change: Soda going 'flat' as dissolved CO2 comes out of solution? -
Answer✔Physical. Before, CO2 was inside the soda. After, it is simply out of the soda and there
is no change to the actual molecular identity of the substance.
Is this a chemical or physical change: Soldering a pipe in your house? - Answer✔Physical. When
you solder a pipe, you are melting and then allowing the binding metal to solidify and bring the
two sides together. There is no change to chemical identity.
Is density a chemical or physical property? - Answer✔physical
Is melting point a chemical or physical property? - Answer✔physical
Is conductivity a chemical or physical property? - Answer✔physical
Is malleability a chemical or physical property? - Answer✔physical
Is tarnishing/rusting a chemical or physical property? - Answer✔chemical
Are reactions chemical or physical properties? - Answer✔chemical
How does a hypothesis differ from a scientific theory? - Answer✔A scientific hypothesis is a
statement or prediction which is testable, however scientific theory is a hypothesis which is
supported by many different sources through numerous experiments. Scientific theories are
concise and well-tested, explaining why a natural phenomenon is observed or why a theory is
true.
How does a hypothesis become a theory? - Answer✔A hypothesis becomes a theory when
there are several experiments which prove its validity. Once it is out of the first revision stage, it
moves through a pattern of theory to experiments to second revision, until there is a final
product theory which is supported by many different sources.
How are energy and work related? - Answer✔Energy is transferred from and through different
objects as work or thermal energy.
Explain the difference between potential and kinetic energy? - Answer✔Potential energy is
energy which is stored in objects due to its makeup or position. Kinetic energy, on the other
hand, is the energy of motion.
2
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
What is precision? - Answer✔Precision: How repeatable/reproducible a measurement/value
and is expressed as a ± range.
What is accuracy? - Answer✔Accuracy: How close to the true value a set of measurements are.
To test the precision and accuracy of weight scale in laboratory, you take a small block that is
known to be exactly 1.000g and weigh it three times on the scale. Three measurements are
reported as follows: 0.843g, 0.842g, and 0.843g. Is this scale precise, accurate, both, or neither?
Explain your choice in 1 sentence. - Answer✔This is scale is precise, but not accurate because it
is not within 1% of the true value of 1.000g.
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 112g, 118g, 106g - Answer✔These
measurements are not precise nor accurate, because they are not close enough to be accurate
and they are not consistent either (not precise)
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 99.7g, 100.1g, 100.2g - Answer✔precise
and accurate, because they are close and consistent
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 110 g, 111 g, 110.5 g - Answer✔precise
but not accurate. They are close together but not near the original value
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 105 g, 93 g, 102 g - Answer✔these
numbers are accurate, because their average is 100g, but they are not precise because they are
too far apart
If the real weight of an object is 100 grams, state whether the following measurements are
precise, accurate, both, or neither, and explain why - 100.5 +/-.2 g - Answer✔these
measurements are precise and accurate, because the reported value is within 1% of the actual
number
How many sig figs are in the following number? 0.0509200 - Answer✔6
Scientific Notation: 124mg+316mg = - Answer✔4.40x10^2mg
Scientific Notation: 613ml + 582 ml = - Answer✔1.20 x 10^3 ml
Scientific Notation: 4x10-3 mL - 2x10-5 mL= - Answer✔4.0 x 10^-3 mL
Scientific Notation: 85 ng x 34 ng= - Answer✔2.9 x 10^3 ng^2
Scientific Notation: 25.34 cm ÷ 1.55x10-4 cm= - Answer✔1.63 x 10^5
Scientific Notation: 6.31x104 pm x 3.536 x 105 pm= - Answer✔2.23 x 10^10 pm^2
Calculate with correct SN and SI: 77.3 g + 41.7 g = - Answer✔119.0g = 0.1190 kg
3
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 2:49PM A+
Calculate with correct SN and SI: 123.4 Gm - 68.93 Gm = - Answer✔54.50 Gm
Calculate with correct SN and SI: 21.7 cm x 9300 cm2 = - Answer✔200000 cm^3 = .20m^3
Calculate with correct SN and SI: (2.76x103) (7.4x102 ) nL = - Answer✔2.0x10^6 nL = 2.0 x 10^-3
L
Calculate with correct SN and SI: 8.1x10-1 µm -3.7x10-8 µm = - Answer✔8.1 x 10^-1 µm = 8.1 x
10^-7 m
Calculate with correct SN and SI: 387 pg ÷ 2x10-2 mL = - Answer✔19350 pg/mL = 1.935x10^-11
kg/mL = 2x10^5 kg/m^3
Comfortable room temperature is about 72°F. Body temperature is about 98°F. Water freezes
at 32° F and boils at 212°F. The lowest temperature ever recorded at sea level (by a human) was
-128.6°F at the Soviet Vostok Station in Antarctica, on July 21, 1983. Convert these
temperatures to °C and K. - Answer✔T(°𝐶) = (5/9) [𝑇(°F) − 32] 𝑇(°C) = −89.22 → −89.22° C + 273
= 184𝐾
The diameter of a US dime is 17.9mm, and the diameter of a silver atom is 2.88 A. How many
silver atoms could be arranged side-to-side across the diameter of a dime? (10A = 1 nm). -
Answer✔17.9mm x (1m/1000mm) x (1nm/1x10^-9m) x (10 Å /1nm) x (1Ag atom / 2988 Å) =
6.22 x 10^7 Ag atoms
Which of the following represents the largest amount of matter? 3.0 x 10-1 Mg, 4.5 x 102 mg,
1.0 x 107 µg, 2.0 x 108 ng, 2.5 x 1013 - Answer✔3.0 x 10-1 Mg
Lead metal (11.3 x 109 ng/ml), tungsten (0.019 kg/ml), and liquid mercury (13.5 g/cm3 ) are all
very dense. If chunks of lead and tungsten are placed in liquid mercury, will they sink or float?
Does it matter what size the chunks are? Why or why not? - Answer✔Lead 11.3x10^9ng x
(1x10^-9/1ng) = 11.3g/mL Tungsten 0.019kg x (1000g/1kg) = 19g/mL Lead is less dense than
mercury so it will float, while tungsten is denser than mercury, so it will sink. It does not matter
what size the chunks are, because the quality of sinking and floating is determined solely by the
density of the substance.
The price of gold in May was $1,228.40 per ounce (1 ounce = 28.35 g). A typical gold bar such as
those shown here has a mass of 12.4 kg. How much would one of these bars of gold cost? -
Answer✔12.4 kg x (1000g/1kg) x (1oz./28.35g) x ($1228.40/1oz.) = $537,000.
The price of gold in May was $1,228.40 per ounce (1 ounce = 28.35 g). The density of gold is
19.3 g/cm3 . Suppose a certain gold wedding ring displaced 0.55 mL of liquid when dropped in a
glass of sparkling cider. How much did this wedding ring cost (assuming you paid the market
price of gold). - Answer✔D=m/v -- (19.3g/mL) = (m/.55mL) -- M=10.6g -- 10.6g x (1oz./28.35g) x
($1228.40/1oz.) = $460
How many protons, neutrons, and electrons are in 23Na and what is the mass number? -
Answer✔11 protons, 12 neutrons, 11 electrons and 23
4
