Chemistry

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Q. What happens to the entropy of an isolated system? (2020) 2020
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It can either increase or decrease
Q. What happens to the particles in a gas when the temperature increases? (2023)
  • A. They move slower
  • B. They move faster
  • C. They stay the same
  • D. They condense
Q. What happens to the particles in a solid when it is heated? (2023)
  • A. They move closer together.
  • B. They vibrate more vigorously.
  • C. They become gas.
  • D. They stop moving.
Q. What happens to the particles of a solid when it is heated? (2023)
  • A. They move closer together
  • B. They vibrate faster
  • C. They become a gas
  • D. They lose mass
Q. What happens to the particles of a substance when it changes from a solid to a liquid? (2023)
  • A. They lose energy
  • B. They gain energy
  • C. They remain unchanged
  • D. They become more ordered
Q. What happens to the pressure of a gas if the volume is decreased while the temperature remains constant?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Doubles
Q. What happens to the temperature of a gas during an isothermal expansion? (2021)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Varies with pressure
Q. What happens to the volume of a gas when its temperature increases at constant pressure? (2020)
  • A. Volume decreases
  • B. Volume remains constant
  • C. Volume increases
  • D. Volume fluctuates
Q. What is the atomic mass of Oxygen approximately? (2019)
  • A. 16 u
  • B. 18 u
  • C. 14 u
  • D. 12 u
Q. What is the atomic mass of Sodium (Na)? (2021)
  • A. 22.99
  • B. 23.00
  • C. 24.00
  • D. 25.00
Q. What is the atomic number of Carbon? (2021)
  • A. 6
  • B. 12
  • C. 14
  • D. 8
Q. What is the atomic number of Oxygen?
  • A. 6
  • B. 8
  • C. 16
  • D. 12
Q. What is the basic unit of proteins? (2023) 2023
  • A. Monosaccharide
  • B. Amino acid
  • C. Nucleotide
  • D. Fatty acid
Q. What is the boiling point of water at standard atmospheric pressure?
  • A. 100°C
  • B. 0°C
  • C. 50°C
  • D. 150°C
Q. What is the boiling point trend among alcohols? (2020) 2020
  • A. Decreases with molecular weight
  • B. Increases with molecular weight
  • C. Remains constant
  • D. Increases with branching
Q. What is the boiling point trend among primary, secondary, and tertiary amines?
  • A. Primary > Secondary > Tertiary
  • B. Tertiary > Secondary > Primary
  • C. Secondary > Primary > Tertiary
  • D. All have the same boiling point
Q. What is the boiling point trend of alcohols compared to alkanes?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Varies
Q. What is the boiling point trend of amines compared to alkanes?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Varies
Q. What is the boiling point trend of carboxylic acids compared to alcohols?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Depends on molecular weight
Q. What is the boiling point trend of primary, secondary, and tertiary amines?
  • A. Primary > Secondary > Tertiary
  • B. Tertiary > Secondary > Primary
  • C. Secondary > Primary > Tertiary
  • D. All have the same boiling point
Q. What is the bond angle in a methane (CH4) molecule? (2023) 2023
  • A. 90 degrees
  • B. 109.5 degrees
  • C. 120 degrees
  • D. 180 degrees
Q. What is the cell potential of a Daniell cell at standard conditions?
  • A. 1.10 V
  • B. 1.96 V
  • C. 0.76 V
  • D. 0.34 V
Q. What is the cell potential of a galvanic cell with E° = 1.5 V and Q = 10?
  • A. 1.2 V
  • B. 1.0 V
  • C. 1.3 V
  • D. 1.4 V
Q. What is the change in internal energy (ΔU) for an ideal gas that expands isothermally? (2022)
  • A. 0
  • B. nRT
  • C. nRΔT
  • D. PV
Q. What is the change in internal energy for an ideal gas that expands isothermally? (2019)
  • A. nRT
  • B. 0
  • C. -nRT
  • D. nR(Tf - Ti)
Q. What is the change in internal energy of an ideal gas when it expands isothermally? (2021)
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Depends on the gas
Q. What is the change in internal energy of an ideal gas when it is heated at constant volume? (2021) 2021
  • A. Zero
  • B. Equal to heat added
  • C. Equal to work done
  • D. Equal to pressure times volume
Q. What is the chemical formula for sodium chloride? (2023) 2023
  • A. NaCl
  • B. Na2Cl
  • C. NaCl2
  • D. Na2Cl2
Q. What is the chemical formula for table salt? (2019)
  • A. NaCl
  • B. KCl
  • C. CaCl2
  • D. MgCl2
Q. What is the color of the complex [Cu(H2O)6]2+? (2023) 2023
  • A. Green
  • B. Blue
  • C. Red
  • D. Yellow
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