CHEM103 FINAL EXAM QUESTIONS AND CORRECT
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A piece of metal was found on the side of the road. The metal was put on a balance and found to
have a mass of 45.00 g. The volume was determined by placing the metal into a 25.00 ml column
of oil, which was displaced to 40.00 mL. What was the Density of this metal? - CORRECT
ANSWER 3
What is the formula weight of tyrptophan, C11H12N2O2 ? ___________ - CORRECT
ANSWER 204.23 g/mole
What is the mass percentage of O in H2O - CORRECT ANSWER 88.8%
How many atoms are contained in 80.15 g of chlorine? - CORRECT ANSWER 1.362x10^24
atoms
One atom of calcium-44 and one atom of tin-116 will have how many total number of protons. -
CORRECT ANSWER 70 protons
If Paris, France is 6036.7 miles from Tokyo, Japan. How many kilometers would that be?
Note: 1 km = 0.621 miles. - CORRECT ANSWER 9720.9 km
Which neutral atom of the following elements contains a total of 23 electrons? - CORRECT
ANSWER V
One mole of nitrogen atoms would have the mass of ... - CORRECT ANSWER 14.01 grams
The density of zinc is 7.13 g/ml. What volume of zinc would weight 25 grams? - CORRECT
ANSWER 3.5 ml
Which has the greatest volume?
- 0.00001 ML (Mega-liter)
- 10,000 uL
- 1000 mL
- 100 cL
- 10 L
- 0.1 kL - CORRECT ANSWER 0.1 kL
Which isotope has the same number of neutrons as 55Cr - CORRECT ANSWER 60Cu
What type of molecule is HBr?? - CORRECT ANSWER HBr is a hetero-diatomic molecule.
,What is the correct unit relationship between milligrams and kilograms? - CORRECT
ANSWER 10^6 mg = 1 kg
If an atom is electrically neutral, then this means... - CORRECT ANSWER There must be equal
numbers of electrons and protons.
In the radioactive decay cycle of Thorium, how many protons and how many neutrons are lost
when Thorium-232 decays to Lead-206? - CORRECT ANSWER 8 protons and 18 neutrons
Glycine is the simplest amino acid found in proteins. If the formula weight is 75.07 u, and it is
represented by the chemical formula C2HxNO2. What number does the x stand for in the
formula. - CORRECT ANSWER C2H5NO2
If two neutron atoms are isotopes of the same element, then how are they different from each
other? - CORRECT ANSWER They have different numbers of neutrons.
Which statement correctly describes the nucleus of the atom? - CORRECT ANSWER The
nucleus contains all of the positive charge of the atom.
The mass value 1999.69 grams, correctly rounded to three significant figures, should be written
as: - CORRECT ANSWER 2.00 x 10^3 grams
What would be true about 2.5 moles of glucose C6H12O6 - CORRECT ANSWER There would
be 30 moles of Hydrogen atoms
Which of these is characteristic of a homogeneous solution? - CORRECT ANSWER There is no
variation of physical properties throughout the solution.
Which of the following is an extensive physical property of matter? - CORRECT ANSWER
weight
Which measurement below has the fewest significant figures? - CORRECT ANSWER 1.20 x
10^4 g
Which isotope has 79 protons and 118 neutrons. - CORRECT ANSWER Gold-197
Which of the following is always a characteristic of a chemical change? - CORRECT ANSWER
A new substance is produced.
Which one of these numbers is correctly expressed in scientific notation? - CORRECT
ANSWER −4.53x10^−2
which of the following is an extensive physical property of matter? - CORRECT ANSWER
weight
,Which number has 4 significant digits? - CORRECT ANSWER 4.390
Which pair of Atoms contains a total of 30 protons? - CORRECT ANSWER Aluminum and
Chlorine
Which isotope has the same number of protons as neutrons? - CORRECT ANSWER Neon-20
One mole of boron atoms would have the mass of .... - CORRECT ANSWER 10.81 grams
How many atoms are contained in 5.094 g of vanadium? - CORRECT ANSWER 1/10 of
Avogadro's number
an isotope of a particular element has a mass number equal to twice the atomic number. The
neutral atom contains 25 electrons. The isotope must be... - CORRECT ANSWER Manganese-
50
Which best describes the weight of a sample of matter? - CORRECT ANSWER Weight is a
measure of the gravitational force acting on the object.
Adding a solute, will increase the boiling point of a solvent. - CORRECT ANSWER True
The covalent bonds within a polar molecule are not broken when this type of molecule is
dissolved in water. - CORRECT ANSWER True
Both water and carbon dioxide can undergo the process of sublimation. - CORRECT ANSWER
true
Which state of matter has strong internal cohesive forces, is not very compressible and has its
own volume but can not keep its own shape. - CORRECT ANSWER liquid
The oxidation number of Si in the compound CaSiO3 is +4. - CORRECT ANSWER true
In which substance is bromine in the highest oxidation state?
KBrO4
Br2
KBrO2
NaBrO3
NaBr - CORRECT ANSWER KBrO4
If a balloon is placed in a walk-in freezer what is expected to happen. - CORRECT ANSWER
The volume will decrease and the density will increase.
Which of the following equations represents a redox addition process? - CORRECT ANSWER
C + O2 → CO2
, Balance the equation: titanium(II) nitrate + lithium oxide → titanium(II) oxide + lithium nitrate.
- CORRECT ANSWER Ti(NO3)2 + Li2O => TiO + 2 LiNO3
Calculate the boiling point of a water solution containing 3.86 M Na2SO4, a strong electrolyte.
First, What is the n value (number of ions produced from Na2SO4)? (1, 2, 3, 4, 5)
Second, Δtempb = n(Kb)M, where Kb = 0.52 oC/M = _____
Third, What is the new solution Boiling point = ________ oC - CORRECT ANSWER n value =
3
Δtemp b = 6.02 oC
New Boiling point = 106.02 oC
A balloon is tied to a cinder block and dropped to the bottom of a Lake. On the surface, the
balloon has a volume of 5.00 liters at 72.0 oF and 1.00 atmosphere of pressure. What will be the
pressure at the bottom of the lake where the temperature is 15.0 oC and the balloon has a volume
of 1000 milliliters. Answer the following questions:
What is the initial Temperature in K?
What is the final Temperature in K?
What is the final Volume in Liters?
What is the final Pressure in Atmospheres? - CORRECT ANSWER T1 = 295.4 K
T2 = 288.2 K
V2 = 1.00 L
P2 = 4.88 atm
Iron ore, Fe2O3, can be reduced with carbon monoxide gas, CO, to produce pure iron metal, Fe,
and carbon dioxide, CO2
The balanced chemical equation is: Fe2O3 + 3 CO → 2 Fe + 3 CO2
How many grams of pure iron metal, Fe, can be made from 125 g of iron ore, Fe2O3 (Pick the
closest number) - CORRECT ANSWER 89.1 grams Fe
What is the total pressure of a mixture of 3 gases, O2 = 1900 torr, N2 = 2280 mmHg and He =
3.5 atm - CORRECT ANSWER This is a Dalton's Law problem, 9.0 atm
Which statement is true for a solution containing 425 grams of water and 125 grams of AgNO3?
- CORRECT ANSWER Water would be classified as the solvent and the solute concentration is
22.7% (w/w)
What is the correct translation of the concentration unit 2.0 M HCl (Hydrochloric acid)? -
CORRECT ANSWER 2.0 moles of HCl / 1 liter of solution
It is possible to dissolve up to 101 g of magnesium bromide, MgBr2, at 20 oC in 100 ml of
water. If one dissolved 90 g of magnesium bromide, at the same temperature; what can you say
about the solution. - CORRECT ANSWER The solution is unsaturated.
How many mL of 4.00 M NaCl solution are needed to prepare 400 ml of 0.500 M NaCl solution.
- CORRECT ANSWER 50 mL
ANSWERS|ACCURATE ACTUAL EXAM WITH FREQUENTLY
TESTED QUESTIONS AND STUDY GUIDE| GUARANTEED
PASS|ALREADY GRADED A+|LATEST UPDATE 2024/2025.
A piece of metal was found on the side of the road. The metal was put on a balance and found to
have a mass of 45.00 g. The volume was determined by placing the metal into a 25.00 ml column
of oil, which was displaced to 40.00 mL. What was the Density of this metal? - CORRECT
ANSWER 3
What is the formula weight of tyrptophan, C11H12N2O2 ? ___________ - CORRECT
ANSWER 204.23 g/mole
What is the mass percentage of O in H2O - CORRECT ANSWER 88.8%
How many atoms are contained in 80.15 g of chlorine? - CORRECT ANSWER 1.362x10^24
atoms
One atom of calcium-44 and one atom of tin-116 will have how many total number of protons. -
CORRECT ANSWER 70 protons
If Paris, France is 6036.7 miles from Tokyo, Japan. How many kilometers would that be?
Note: 1 km = 0.621 miles. - CORRECT ANSWER 9720.9 km
Which neutral atom of the following elements contains a total of 23 electrons? - CORRECT
ANSWER V
One mole of nitrogen atoms would have the mass of ... - CORRECT ANSWER 14.01 grams
The density of zinc is 7.13 g/ml. What volume of zinc would weight 25 grams? - CORRECT
ANSWER 3.5 ml
Which has the greatest volume?
- 0.00001 ML (Mega-liter)
- 10,000 uL
- 1000 mL
- 100 cL
- 10 L
- 0.1 kL - CORRECT ANSWER 0.1 kL
Which isotope has the same number of neutrons as 55Cr - CORRECT ANSWER 60Cu
What type of molecule is HBr?? - CORRECT ANSWER HBr is a hetero-diatomic molecule.
,What is the correct unit relationship between milligrams and kilograms? - CORRECT
ANSWER 10^6 mg = 1 kg
If an atom is electrically neutral, then this means... - CORRECT ANSWER There must be equal
numbers of electrons and protons.
In the radioactive decay cycle of Thorium, how many protons and how many neutrons are lost
when Thorium-232 decays to Lead-206? - CORRECT ANSWER 8 protons and 18 neutrons
Glycine is the simplest amino acid found in proteins. If the formula weight is 75.07 u, and it is
represented by the chemical formula C2HxNO2. What number does the x stand for in the
formula. - CORRECT ANSWER C2H5NO2
If two neutron atoms are isotopes of the same element, then how are they different from each
other? - CORRECT ANSWER They have different numbers of neutrons.
Which statement correctly describes the nucleus of the atom? - CORRECT ANSWER The
nucleus contains all of the positive charge of the atom.
The mass value 1999.69 grams, correctly rounded to three significant figures, should be written
as: - CORRECT ANSWER 2.00 x 10^3 grams
What would be true about 2.5 moles of glucose C6H12O6 - CORRECT ANSWER There would
be 30 moles of Hydrogen atoms
Which of these is characteristic of a homogeneous solution? - CORRECT ANSWER There is no
variation of physical properties throughout the solution.
Which of the following is an extensive physical property of matter? - CORRECT ANSWER
weight
Which measurement below has the fewest significant figures? - CORRECT ANSWER 1.20 x
10^4 g
Which isotope has 79 protons and 118 neutrons. - CORRECT ANSWER Gold-197
Which of the following is always a characteristic of a chemical change? - CORRECT ANSWER
A new substance is produced.
Which one of these numbers is correctly expressed in scientific notation? - CORRECT
ANSWER −4.53x10^−2
which of the following is an extensive physical property of matter? - CORRECT ANSWER
weight
,Which number has 4 significant digits? - CORRECT ANSWER 4.390
Which pair of Atoms contains a total of 30 protons? - CORRECT ANSWER Aluminum and
Chlorine
Which isotope has the same number of protons as neutrons? - CORRECT ANSWER Neon-20
One mole of boron atoms would have the mass of .... - CORRECT ANSWER 10.81 grams
How many atoms are contained in 5.094 g of vanadium? - CORRECT ANSWER 1/10 of
Avogadro's number
an isotope of a particular element has a mass number equal to twice the atomic number. The
neutral atom contains 25 electrons. The isotope must be... - CORRECT ANSWER Manganese-
50
Which best describes the weight of a sample of matter? - CORRECT ANSWER Weight is a
measure of the gravitational force acting on the object.
Adding a solute, will increase the boiling point of a solvent. - CORRECT ANSWER True
The covalent bonds within a polar molecule are not broken when this type of molecule is
dissolved in water. - CORRECT ANSWER True
Both water and carbon dioxide can undergo the process of sublimation. - CORRECT ANSWER
true
Which state of matter has strong internal cohesive forces, is not very compressible and has its
own volume but can not keep its own shape. - CORRECT ANSWER liquid
The oxidation number of Si in the compound CaSiO3 is +4. - CORRECT ANSWER true
In which substance is bromine in the highest oxidation state?
KBrO4
Br2
KBrO2
NaBrO3
NaBr - CORRECT ANSWER KBrO4
If a balloon is placed in a walk-in freezer what is expected to happen. - CORRECT ANSWER
The volume will decrease and the density will increase.
Which of the following equations represents a redox addition process? - CORRECT ANSWER
C + O2 → CO2
, Balance the equation: titanium(II) nitrate + lithium oxide → titanium(II) oxide + lithium nitrate.
- CORRECT ANSWER Ti(NO3)2 + Li2O => TiO + 2 LiNO3
Calculate the boiling point of a water solution containing 3.86 M Na2SO4, a strong electrolyte.
First, What is the n value (number of ions produced from Na2SO4)? (1, 2, 3, 4, 5)
Second, Δtempb = n(Kb)M, where Kb = 0.52 oC/M = _____
Third, What is the new solution Boiling point = ________ oC - CORRECT ANSWER n value =
3
Δtemp b = 6.02 oC
New Boiling point = 106.02 oC
A balloon is tied to a cinder block and dropped to the bottom of a Lake. On the surface, the
balloon has a volume of 5.00 liters at 72.0 oF and 1.00 atmosphere of pressure. What will be the
pressure at the bottom of the lake where the temperature is 15.0 oC and the balloon has a volume
of 1000 milliliters. Answer the following questions:
What is the initial Temperature in K?
What is the final Temperature in K?
What is the final Volume in Liters?
What is the final Pressure in Atmospheres? - CORRECT ANSWER T1 = 295.4 K
T2 = 288.2 K
V2 = 1.00 L
P2 = 4.88 atm
Iron ore, Fe2O3, can be reduced with carbon monoxide gas, CO, to produce pure iron metal, Fe,
and carbon dioxide, CO2
The balanced chemical equation is: Fe2O3 + 3 CO → 2 Fe + 3 CO2
How many grams of pure iron metal, Fe, can be made from 125 g of iron ore, Fe2O3 (Pick the
closest number) - CORRECT ANSWER 89.1 grams Fe
What is the total pressure of a mixture of 3 gases, O2 = 1900 torr, N2 = 2280 mmHg and He =
3.5 atm - CORRECT ANSWER This is a Dalton's Law problem, 9.0 atm
Which statement is true for a solution containing 425 grams of water and 125 grams of AgNO3?
- CORRECT ANSWER Water would be classified as the solvent and the solute concentration is
22.7% (w/w)
What is the correct translation of the concentration unit 2.0 M HCl (Hydrochloric acid)? -
CORRECT ANSWER 2.0 moles of HCl / 1 liter of solution
It is possible to dissolve up to 101 g of magnesium bromide, MgBr2, at 20 oC in 100 ml of
water. If one dissolved 90 g of magnesium bromide, at the same temperature; what can you say
about the solution. - CORRECT ANSWER The solution is unsaturated.
How many mL of 4.00 M NaCl solution are needed to prepare 400 ml of 0.500 M NaCl solution.
- CORRECT ANSWER 50 mL
