Chemistry
CHE 140 Name__Chesi Spriggs First Hour Exam
Potentially useful information
1000 g = 1 kg 1000 mL = 1 L 1 in = 2.54 cm 1 mL = 1 cm3 D = m/v
Select the best choice for the following questions.
___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above.
__b___ 2. The initial success of the Bohr theory was based on
a. its ability to predict the atomic spectra of multi-electron atoms. b. its ability to predict the atomic spectrum of hydrogen atoms. c. its prediction of the precise radius of electron orbits of hydrogen. d. its elegant inclusion of the Heisenberg uncertainty principle.
___c___ 3. . An object with a mass of 163.0 g displaces 28.6 mL of water. What is the density of the object.
a. 7.50 g/mL b. 9.25 g/mL c. 5.70 g/mL d. 264.5 g/mL e. None of the above. SHOW WORK HERE:
D= 163.0/28.6 D=5.7
Page 2
__c___ 4. Of the following substances, the least dense is that of (HINT: estimate or calculate the density of the choices)? a. 1000 g of water at 4 oC b. 100.0 cm3 of chloroform, which weighs 148.9 g c. a 10.0 cm3 piece of wood weighing 7.72 g d. an ethyl alcohol ‑ water mixture of density 0.83 g/mL.
__a___ 5. The scattering of alpha particles by thin metal foils established that a. the mass and positive charge of an atom are concentrated in the nucleus. b. electrons are fundamental particles of all matter c. all electrons have the same charge d. atoms are electrically neutral.
__c__ 6. What is the electron configuration for Ar ?
a. 1s22s22p63s23p63d2
b. 1s22s22p63s23p64s2
c. 1s22s22p63s23p6
d. 1s22s22p62d83s2
___a___ 7. In science, the correct result for the multiplication 447.0 x 0.340 is
a. 152 c. 1.52x101 b. 152.3. d. 1.52x10-1 e. none of the
Potentially useful information
1000 g = 1 kg 1000 mL = 1 L 1 in = 2.54 cm 1 mL = 1 cm3 D = m/v
Select the best choice for the following questions.
___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above.
__b___ 2. The initial success of the Bohr theory was based on
a. its ability to predict the atomic spectra of multi-electron atoms. b. its ability to predict the atomic spectrum of hydrogen atoms. c. its prediction of the precise radius of electron orbits of hydrogen. d. its elegant inclusion of the Heisenberg uncertainty principle.
___c___ 3. . An object with a mass of 163.0 g displaces 28.6 mL of water. What is the density of the object.
a. 7.50 g/mL b. 9.25 g/mL c. 5.70 g/mL d. 264.5 g/mL e. None of the above. SHOW WORK HERE:
D= 163.0/28.6 D=5.7
Page 2
__c___ 4. Of the following substances, the least dense is that of (HINT: estimate or calculate the density of the choices)? a. 1000 g of water at 4 oC b. 100.0 cm3 of chloroform, which weighs 148.9 g c. a 10.0 cm3 piece of wood weighing 7.72 g d. an ethyl alcohol ‑ water mixture of density 0.83 g/mL.
__a___ 5. The scattering of alpha particles by thin metal foils established that a. the mass and positive charge of an atom are concentrated in the nucleus. b. electrons are fundamental particles of all matter c. all electrons have the same charge d. atoms are electrically neutral.
__c__ 6. What is the electron configuration for Ar ?
a. 1s22s22p63s23p63d2
b. 1s22s22p63s23p64s2
c. 1s22s22p63s23p6
d. 1s22s22p62d83s2
___a___ 7. In science, the correct result for the multiplication 447.0 x 0.340 is
a. 152 c. 1.52x101 b. 152.3. d. 1.52x10-1 e. none of the