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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