QCHEM-112 Week 11-20
Q1. Atom with the greatest number of unpaired electrons:
Answer: Cr
Q2. Incorrect statement about orbitals:
Answer: Orbitals can hold two electrons provided they are spinning in the same direction
Q3. This type of wave has certain allowable states or energies:
Answer: Standing
Q4. Incorrect statement about d orbitals:
Answer: d orbitals are filled before p orbitals in the same principal energy level
Q5. Electrons enter the 4s sub-level before the 3d sub-level because:
Answer: The 4s orbital has a lower energy
Q6. Quantum number describing the average distance of the orbital from the nucleus:
Answer: Principal
Q7. Quantum number that gives you an idea on the shape of the electron orbital:
Answer: Angular momentum
Q8. Incorrect statement about s orbitals:
Answer: They can only hold one electron
Q9. Alternative term for electron clouds or the probable path of electrons:
Answer: Orbital
Q10. Describes the wavelike behaviour of an electron or a pair of electrons in an atom:
Answer: Atomic orbital
Q11. Smaller units that make up the sub-atomic particles of the nucleus:
Answer: Quarks
Q12. Particle that is approximately as heavy as a proton but is neutrally charged:
Answer: Neutron
Q13. Absolute value of the possible values for the spin quantum number of an electron:
Answer: ½
Q14. Quantum number describing the direction of the electron along its orbit:
Answer: Spin
Q15. Valence electrons in an electrically neutral atom of lead:
Answer: 4
Q16. Not the electronic configuration of a noble gas atom:
Answer: 1s²2s²
Q17. Electronic configuration of a sodium ion, Na⁺:
Answer: 1s²2s²2p⁶
Q18. Electronic configuration of an oxide ion, O²⁻:
Answer: 1s²2s²2p⁶
Q19. Ion with an electronic configuration similar to argon:
Answer: Ti⁴⁺
Q20. The electronic configuration of an atom with atomic number 8:
Answer: 1s²2s²2p⁴
Q21. Number of energy levels in an atom of tungsten:
Answer: 6
Q22. An atom of meitnerium has how many energy levels?
Answer: 7
Q23. How many energy levels does an atom of plutonium have?
Answer: 7
Q24. How many valence electrons does an electrically neutral atom of thallium have?
Answer: 3
Q25. Number of valence electrons in an electrically neutral atom of antimony:
Answer: 5
Q26. Which element has a larger atom: technetium or gold?
Answer: Gold
Q27. Higher electronegativity: niobium or tin?
Answer: Tin
Q28. Which element more easily releases an electron: technetium or indium?
Answer: Indium
Q29. Higher atomic radius: chlorine or osmium?
Answer: Osmium
Q30. Which element has a smaller atom: zirconium or tellurium?
Answer: Tellurium
Q31. Which element requires more energy to release an electron: copper or roentgenium?
Answer: Copper
Q32. Bond formed between a metal and a non-metal:
Answer: Ionic
Q33. Type of ion assumed by a metal:
Answer: Cation
Q34. Type of ion assumed by a non-metal:
Answer: Anion
Q35. Which of the following is a salt?
Answer: Zinc selenide
Q36. Which of these compounds can conduct electricity when mixed with a solvent?
Answer: Lithium oxide
Q37. What element is the cation in potassium oxide?
Answer: Potassium
Q38. What element is the anion in sodium selenide?
Answer: Selenium
Q39. Which of these compounds has a relatively high melting point?
Answer: Sodium bromide
Q40. What happens to electrons in ionic bonding?
Answer: Transferred
Q41. Which of the following is not a salt?
Answer: Carbon tetrachloride
Q42. What type of bond can form between nitrogen and hydrogen?
Answer: Covalent
Q43. Which of the following is a covalent compound?
Answer: Carbon tetrachloride
Q44. Manner of bonding between two non-metals:
Answer: Sharing
Q45. Tendency of an atom to attract electrons in a bond:
Answer: Electronegativity
Q46. Which element is more electronegative: tin or antimony?
Answer: Antimony
Q47. Geometry of a non-polar covalent compound with no lone pairs and three bonding electron groups:
Answer: Trigonal planar
Q48. This type of compound always contains the carbon atom:
Answer: Organic
Q49. Organic molecules consisting entirely of carbon and hydrogen:
Answer: Hydrocarbons
Q50. Organic acids with a carbon atom in both a hydroxyl and a carbonyl functional group:
Answer: Carboxylic acids
Q51. The simplest hydrocarbon molecule (CH₄):
Answer: Methane
Q52. Specific atoms, ions, or groups of atoms with consistent properties:
Answer: Functional groups
Q53. Functional group from the condensation of an alcohol with a carboxylic acid:
Answer: Esters
Q54. It contains a carbon-carbon double bond:
Answer: Alkenes
Q55. The building blocks of proteins:
Answer: Amino acids
Q56. Carbon double bonded to oxygen:
Answer: Carbonyl group
Q57. De Broglie wavelength of a hydrogen electron moving at 2.2 x 10⁶ m/s (x 10⁻¹⁰ m):
Answer: 3.3
Q58. Grams of carbon monoxide produced from burning 1200 g of carbon:
Answer: 2800
Q59. Grams of water produced from burning 209 g of methanol:
Answer: 235
Q60. Grams of Al₂O₃ formed when 124 g of Al reacts with 601 g of Fe₂O₃:
Answer: 234
Q61. Number of molecules in 3 moles of calcium tetrachloride:
Answer: 1.8066 x 10²⁴
Q62. Percentage of nitrogen in one molecule of ammonia:
Answer: 82.24
Q63. Mass (in grams) of one molecule of ethanol:
Answer: 46.07
Q64. Percentage of sulfur in one molecule of sodium sulfate:
Answer: 22.57
Q65. Grams of oxygen needed to burn 1200 g of graphite:
Answer: 1600
Q66. Molecular mass (in grams) of calcium carbonate:
Answer: 162.11
Q67. Volume (in L) of 0.20 mol HI at 300 K and 100.0 kPa:
Answer: 5
Q68. Concentration (in mol/L) of NaOH if 12.5 mL is neutralized by 500 mL of gaseous HCl at 300 K and 100 kPa:
Answer: 1.60
Q69. Pressure (in torr) of a 0.316 mole sample of nitrogen gas in a 4-L container at 315 K:
Answer: 1550
Q70. Moles of chlorine escaped from a 60.0 L tank if pressure dropped from 125 atm to 50 atm at 27°C:
Answer: 187.5
Q71. Concentration (in M) of AgNO₃ solution if 50.0 mL with excess HI produces 2.35 g of AgI:
Answer: 0.2
