Chemistry 211 Key 3 Fall 2007
1. Which of the following would be a strong electrolyte in aqueous solution?
a) CO2 b) HF c) NH4Cl d) O2 e) SCl2
2. What is the concentration of a solution of 4.28 g calcium sulfate in 300.0 mL of water?
a) 0.0143 M b) 0.0314 M c) 0.105 M d) 0.119 M e) 0.197 M
3. Which of the following is false?
a) All types of radiant energy travel at 3.00 x 108 m/s.
b) Energy is inversely proportional to frequency.
c) The probability of finding an electron at a certain place is its electron density.
d) Each electron has four quantum numbers associated with it.
e) A collection of orbitals with the same principle (n) quantum number is called a shell.
4. Which form of light carries the most energy per photon?
a) infrared light c) radiowaves e) ultraviolet light
b) microwaves d) visible light
5. What wavelength of energy has photons of energy 4.12 x 10-18 J?
a) 1.61 x 10-16 m c) 4.82 x 10-8 m e) 6.22 x 1015 m
b) 1.24 x 10-9 m d) 2.07 x 107 m
6. Which of the following is a metalloid?
a) Al b) As c) Cl d) S e) Sn
7. Which of the following oxides is ionic?
a) N2O b) P2O5 c) SO2 d) XeO3 e) Y2O3
8. Which of the following is false?
a) Alkali metals are strong oxidizing agents.
b) Alkaline earth metals react with oxygen to form compounds with the general formula MO.
c) Non-metals tend to form anions in reactions.
d) The halogens are very reactive.
e) The noble gases are generally unreactive.
