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1. For Questions I – III, use the appropriate choice from A-E. Use only one choice per question.
a)γ
b)11H
c)10n
d)42He
e)2 10n
I. 5426Fe + ? 5626Fe + 2 11H
II. 6529Cu + 10n 6429Cu + ?
III. 147N + 11H 158O + ?
2. Choose the FALSE statement.
a)Nuclei with an even number of protons and an even number of neutrons tend to be stable.
b) “γ” rays are high-energy photons.
c)Nuclei with too few neutrons per proton tend to undergo positron (01β) emission.
d)Light nuclides are stable when the atomic number (Z) equals the mass number minus the atomic number (A – Z).
e)Nuclei with too many neutrons per proton tend to undergo positron (01β) emission.
3. Green light has a wavelength of 5.50 X 102 nm. The energy of a photon of green light is
a) 3.64 X 10–38 J
b) 2.17 X 105 J
c) 3.61 X 10–19 J
d) 1.09 X 10–27 J
e) 5.45 X 1012 J
4. In which groups do all the elements have the same number of valence electrons?
a) P, S, Cl
b) Ag, Cd, Ar
c) Na, Ca, Ba
d) P, As, Se
e) none
5. When the Pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element?
a) Cd-112
b) Cd 109
c) Ag-108
d) Ag-109
e) none of these
6. Consider a certain type of nucleus that has a half-life of 30 min. Calculate the percent of original sample of nuclides remaining after 3.0 hours have passed.
7. What role does moderator play in a nuclear reactor?
- slows down the neutrons
- transfers heat from the reactor to the heat exchanger
- controls chain reaction
- transfers heat from the condenser to the environment
- undergoes fission
8. What is general group configuration of s block elements?
9. Which of the following make an isoelectronic pair; Cl – , O2 –, F, Ca2+, Fe3+?
- Ca2+ and Fe3+
- O2 – and F
- F and Cl –
- Cl – and Ca2+
- none of the above
10. How many atoms (total) are there in one formula unit of Ca3(PO4)2?
11. All of the following are in aqueous solution. Which is incorrectly named?
a) H2SO4, sulfuric acid
b) H2CO3, carbonic acid
c) H3PO4, phosphoric acid
d) HCN, cyanic acid
e) HCl, hydrochloric acid
12. Write the names of the following compounds:
a) FeSO4______
b) NaC2H3O2______
c) KNO2______
d) Ca(OH)2______
e) NiCO3______
13. Write the formula for:
a) dinitrogen trioxide
b) cobalt (II) chloride
14. The molar mass of an insecticide, dibromoethane, is 187.9. Its molecular formula is C2H4Br2. What percent by mass of bromine does dibromoethane contain?
(Show work!)
a) 37.8%
b) 42.5%
c) 50.0%
d) 85.0%
e) 89.3%
15. Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180. The molecular formula for vitamin C is:
(Show work!)
a) C2H3O2
b) C3H4O3
c) C4H6O4
d) C6H8O6
Answers to the test