PHYSICAL CHEMISTRY EXAM REVISION QUESTIONS 2024/2025. THE LATEST
REVISION QUESTIONS AND CORRECT ANSWERS IN 2024/2025. (ALREADY
GRADED A+) (LATEST 2024 UPDATE)
What was Johann Dobereiner's contribution to the development of the periodic table? - ANSWER-
A. He arranged the elements according to increasing atomic mass.
B. He arranged the elements according to increasing atomic number.
C. He identified triads of elements that had similar properties.
D. He organized elements into four groups based on their properties.
C. He identified triads of elements that had similar properties.
Which is a property of covalent compounds? - ANSWER- A. They ionize in solution.
B. They tend to be very hard.
C. They have a low boiling point. this is the answer:)
D. They have a high melting point.
The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3).
NH4NO3 mc018-1.jpg N2O + 2H2O
A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of
NH4NO3 is 80.03 g/mol; the molar mass of water (H2O) is 18.01 g/mol. What mass, in grams, of
H2O is produced? - ANSWER- A. 9.01
B. 18.01
C. 36.03
D. 72.06
D. 72.06
Which law is described by saying that when the pressure of a gas in a sealed container is cut in
half, the gas will double in volume at a steady temperature? - ANSWER- A. Boyle's law
, B. Charles's law
C Dalton's law
D. Gay-Lussac's law
A. Boyle's law
How many electrons can the n = 4 shell hold? - ANSWER- A. 8
B. 16
C. 32
D. 64
Which of these is an example of a physical change? - ANSWER- A. sugar, when heated,
producing carbon dioxide and water
B. solid ice, when heated, turning into liquid water
C. sodium, when exposed to chlorine, forming sodium chloride
D. aluminum, when heated in air, forming aluminum oxide
B. solid ice, when heated, turning into liquid water
A chemical equation can be used to solve stoichiometry problems provided that is - ANSWER-
A. indicates only the forward reaction and not the reverse
B. indicates that reactants are in the gas phase and are not solids or liquids
C. includes the coefficients that are needed for balancing the equation
D. includes the state of matter for each substance
C. includes the coefficients that are needed for balancing the equation
Which statement describes a chemical property of water? - ANSWER- A. It reacts with sodium
metal.
B. It has a melting point of 0°C.
C. It has a density of about 1 g/mL.
D. It is clear and colorless.
REVISION QUESTIONS AND CORRECT ANSWERS IN 2024/2025. (ALREADY
GRADED A+) (LATEST 2024 UPDATE)
What was Johann Dobereiner's contribution to the development of the periodic table? - ANSWER-
A. He arranged the elements according to increasing atomic mass.
B. He arranged the elements according to increasing atomic number.
C. He identified triads of elements that had similar properties.
D. He organized elements into four groups based on their properties.
C. He identified triads of elements that had similar properties.
Which is a property of covalent compounds? - ANSWER- A. They ionize in solution.
B. They tend to be very hard.
C. They have a low boiling point. this is the answer:)
D. They have a high melting point.
The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3).
NH4NO3 mc018-1.jpg N2O + 2H2O
A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of
NH4NO3 is 80.03 g/mol; the molar mass of water (H2O) is 18.01 g/mol. What mass, in grams, of
H2O is produced? - ANSWER- A. 9.01
B. 18.01
C. 36.03
D. 72.06
D. 72.06
Which law is described by saying that when the pressure of a gas in a sealed container is cut in
half, the gas will double in volume at a steady temperature? - ANSWER- A. Boyle's law
, B. Charles's law
C Dalton's law
D. Gay-Lussac's law
A. Boyle's law
How many electrons can the n = 4 shell hold? - ANSWER- A. 8
B. 16
C. 32
D. 64
Which of these is an example of a physical change? - ANSWER- A. sugar, when heated,
producing carbon dioxide and water
B. solid ice, when heated, turning into liquid water
C. sodium, when exposed to chlorine, forming sodium chloride
D. aluminum, when heated in air, forming aluminum oxide
B. solid ice, when heated, turning into liquid water
A chemical equation can be used to solve stoichiometry problems provided that is - ANSWER-
A. indicates only the forward reaction and not the reverse
B. indicates that reactants are in the gas phase and are not solids or liquids
C. includes the coefficients that are needed for balancing the equation
D. includes the state of matter for each substance
C. includes the coefficients that are needed for balancing the equation
Which statement describes a chemical property of water? - ANSWER- A. It reacts with sodium
metal.
B. It has a melting point of 0°C.
C. It has a density of about 1 g/mL.
D. It is clear and colorless.
