Download Practice Test/Quiz Questions – Chapter 1, 2, 3 Chemical Foundations

CH307 Unit 1 Practice Questions
Guido Gabbrielli
Atomic Structure
1.
Identify the INCORRECT statement regarding the gold foil experiment:
a. Few particles rebounded as if hitting very dense positive charges in the foil.
b. Most particles bounced back from the gold foil.
c. Most particles passed through the foil as if through empty space.
d. The gold foil was bombarded with positively charged alpha particles
2.
All of the following details are true of Rutherford’s famous gold foil experiment, EXCEPT:
a. A very, very few alpha particles were turned through an angle of 90° or more
b. Almost all alpha particles went through gold foil as if it were not present
c. Experiment results confirmed Dalton’s atom model
d. Some of alphaparticles were deflected only slightly, usually 2° or less, 1° most commonly
e. Data obtained did not support J.J. Thompson atomic model
3.
In chemical reactions, metals can be:
a. Proton donors
b. Electron donors
c. Electron acceptors
d. Electron donors and acceptors
e. Proton acceptors
4.
Two chemicals, A and B, react completely to yield products C and D. If 4 g of A and 8 g of B are reacted
(with no excess of either), and 5 g of C are produced, how much D is produced?
a. 3 g
b. No D is produced
c. 5 g
d. 7 g
e. 9 g
5.
The isotope of uranium used in nuclear power plants is U-235. How many protons, neutrons and electrons
does one atom of this isotope have?
a. 235 protons, 92 neutrons, 235 electrons.
b. 92 protons, 235 neutrons, 92 electrons.
c. 143 protons, 92 neutrons, 143 electrons.
d. 92 protons, 143 neutrons, 92 electrons.
e. 92 protons, 92 neutrons, 143 electrons
6.
What causes the deflection of an alpha particle by the nucleus of a gold atom?
a. The widespread distribution of mass in the atom
b. The low mass of the nucleus
c. The positive charge of the alpha particle and the negative charge of the nucleus
d. The negative charge of the alpha particle and the positive charge of the nucleus
e. The positive charge of the alpha particle and the positive charge of the nucleus
7.
All of the following points were included in Dalton’s atomic theory except:
a. Chemical elements are made of atoms
b. Atoms are composed of smaller particles
c. Atoms of an element are identical in their masses
d. Atoms of different elements have different masses
e. Atoms combine in small, whole number ratios such as 1:1, 1:2, 2:3 and so on to form compounds
8.
9.
Which of the following atomic symbols is incorrect?
a. 32
15 P
39
b. 19 K
c. 146 C
d. 148 N
e. 37
17 Cl
40
2
has
20 Ca
a. 20 protons, 22 neutrons, and 18 electrons.
b. 22 protons, 18 neutrons, and 18 electrons.
c. 20 protons, 20 neutrons, and 22 electrons.
d. 20 protons, 20 neutrons, and 18 electrons.
e. 22 protons, 20 neutrons, and 20 electrons.
10. J.J. Thompson proved that cathode rays traveled in straight lines with the following observation:
a. Cathode ray can push a small paddle wheel straight up an incline, against force of gravity
b. Cathode ray deflected from straight-line path by a magnetic field
c. If object is placed in path of cathode ray, a shadow of object is cast on the glowing tube wall at
the end
d. As can be visually observed, cathode rays travel in straight line
e. Cathode rays, having significant mass, when traveling at high velocity can only travel in a
straight line
11. Cathode-ray-tube experiments provided the first evidence of ________.
a. Subatomic particles
b. x-rays
c. Fluorescence
d. Electric fields
e. Magnetic fields
12. The correct isotopic symbol for an atom of an element containing 47 protons and 62 neutrons is
a. Ag-109
b. Sm-109
c. P-15
d. Ag-47
13. Given the information below, calculate the weighted average atomic mass (amu) of the element X.
Isotope
Abundance (%) Mass(amu)
221
X
74.22
220.9
220
X
12.78
220.0
218
X
13.00
218.1
14. Indium (Atomic weight 114.82) has two naturally occurring isotopes, the predominant one being 115In with
isotopic weight 114.9041 and an abundance of 95.720%. What is the atomic weight for the other isotope?