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DCChem At Struct Unit Test Dr. Zisk/CCS/2010. NAME_______________________________ 1. What is the mass of one mole of potassium-39 atoms? Answer__39g_ 2. How many protons are in the nucleus of phosphorous-33? Answer _15__ 3. All atoms of a given single element must contain the same numbers of... a) shells b) protons c) neutrons d) oxidation states 4. Two different isotopes of a given element must have different numbers of... a) protons b) neutrons c) electrons d) configurations 5. All atoms in a sample of the same isotope of a given element must have... a. the same mass numbers b. different mass numbers c. different charge numbers d. the same atomic numbers 6. The atom helium-4 differs from the atom lithium-7 by how many neutrons? Answer:_2 vs 4____ 7. What is the nuclear charge of carbon-14? 8. A carbide ion, C4-, formed from carbon-12, contains how many electrons? Answer:_10__ 9. The selenide ion, Se2-, formed from selenium-78, has the same electron configuration as... a) Br b) Ge c) Se d) Kr a) 14 b) 10 c) 6 d) 0 10. A sample is separated by physical means to form two different elements, so it must be... a) a compound b) an element c) a mixture d) a molecule 11. Why are most masses on the Periodic Table decimal values instead of whole numbers? Answer: ____the natural masses are a weighted average of the various isotopes... _________ 12. As an atom is ionized, its number of protons...a) decreases b) increases c) decreases or increases d) doesn’t change 13. When a Ca atom is oxidized to Ca2+, the number of electrons... a) decreases b) increases c) remains the same Given the following combustion reaction in open air: C6H12O6 + 6O2 6CO2 + 6H2O... If 4 moles of the sugar reacts completely, then how many moles of carbon dioxide will be formed? Please show your work or explain your reasoning for full credit. the ratio of sugar to carbon dioxide is 1:6, so whatever sugar I start with, 6 times as much CO 2 will be obtained… so 4 sugars produce 24 CO2 14. How many moles of magnesium make up a 48.6 gram sample You must show your equation, your substitutions and your answer, with all units for full credit... moles = given mass/GFM mol = 48.6g/(24.3g/mol) = 2.00 mol 15. Given 132 grams of carbon dioxide, how many moles do you have? You must show your equation, your substitutions and your answer, with all units for full credit... first, the GFM of CO2 = 12 + 2(16) g/mol = 44 g/mol then, moles = given mass/GFM = 132g/(18 g/mol) = 3.00 moles 16. The total number of electrons in the valence shell of a chlorine atom in the ground state is... a) 10 17. Which is a correct electron configuration for excited state for sulfur? a) 2-8-5-0 1 b) 2-8-6 b) 8 c) 2-8-5-1 c) 7 d) 17 d) 2-8-6-0 18. Give the complete groundstate electron configuration (including the “1s 2...” notation) for the chloride ion, Cl1- ... Answer: ___ ls22s22p63s23p6_______________ 19. When an atom emits light, its electrons... a. move from ground state to excited state absorbing energy. b. move from ground state to excited state releasing energy. c. move from excited state to ground state releasing energy. d. move from excited state to ground state absorbing energy. 20. From which orbital would electrons be removed to produce the Ba2+? a) 2s b) 2p c) 6s d) 6p 21. Which is the electron configuration of an atom in the excited state? a) ls22s22p2 b) ls22s22p1 c) ls22s22p63s2 d) 1s22s22p53s1 22. When electrons are excited, energy is: a) absorbed b) released c) unchanged d) unobservable 23. When electrons in a sample of excited atoms return to the groundstate, we observe the a) continuous spectrum b) emitted alpha particles c) bright line spectrum d) gamma radiation 24. What is the total number of electrons in the fourth principal energy level of groundstate calcium? a) 2 b) 6 c) 8 d) 18 25. Which is the electron configuration of calcium in its only possible ionized state? a) ls22s22p63s23p64s2 b) ls22s22p63s23p64s1 c) ls22s22p63s23p64s0 d) 1s22s22p63s23p64s13d1 26. Which is an electron configuration of a Ca atom in an excited state? a. ls22s22p63s23p63d54s1 2 2 b. 1s 2s 2p63s23p64s1 c. 1s22s22p63s23p64s14p1 d. 1s22s22p63s23p64s0 27. In ground state oxygen, what is the total number of orbitals that contain only one electron? 28. Which sublevel contains a total of three orbitals? a) s 29. Which of the following sublevels has the highest energy? b) p a) 3s 30. What is the maximum number of electrons in an orbital of any atom? c) d d) f b) 3p c) 3d a) 1 b) 2 a) 1 b) 2 c) 3 d) 4s c) 6 d) 10 31. What does the quantum number “l” tell us? Answer: _____angular moment, or shape; sublevel________ 32. Sketch the correctly filled orbital energy diagram of the groundstate phosphide ion, P 3-, in the space below… 2 d) 4