Download CHEMISTRY: MIDTERM EXAM REVIEW SPRING 2013 Multiple

CHEMISTRY: MIDTERM EXAM REVIEW
SPRING 2013
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. The atomic number of an element is the total number of which particles in the nucleus?
a. electrons
c. neutrons
b. protons and electrons
d. protons
2. What is the volume of 80.0 g of ether if the density of ether is 0.70 g/mL?
a. 80 mL
c. 110 mL
b. 0.0088 mL
d. 56 mL
3. Which of the following elements does NOT form an ion with a charge of 1 ?
a. sodium
c. hydrogen
b. fluorine
d. potassium
4. The least penetrating form of radiation is ____.
a. alpha radiation
c. gamma radiation
b. X rays
d. beta radiation
5. In which of the following is the number of neutrons correctly represented?
a.
c.
As has 108 neutrons.
U has 146 neutrons.
b.
d.
F has 0 neutrons.
Mg has 24 neutrons.
6. The metals in Groups 1A, 2A, and 3A ____.
a. lose electrons when they form ions
b. gain electrons when they form ions
____
7.
____
8.
____
9.
____ 10.
____ 11.
____ 12.
____ 13.
c. all form ions with a negative charge
d. all have ions with a 1 charge
What is the electron configuration of potassium?
a. 1s 2s 2p 3s 3p
c. 1s 2s 3s 3p 3d
b. 1s 2s 2p 3s 3p 4s
d. 1s 2s 2p 3s 3p 4s
The modern periodic table is arranged in order of increasing atomic ____.
a. number
c. radius
b. charge
d. mass
A reaction in which small nuclei combine to form a heavier nucleus is called ____.
a. fission
c. background radiation
b. a chemical reaction
d. fusion
How many half-filled orbitals are in a bromine atom?
a. 2
c. 1
b. 3
d. 4
What is the electron configuration of the calcium ion?
a. 1s22s22p63s2
c. 1s22s22p63s23p44s2
2
2
6
2
6
1
b. 1s 2s 2p 3s 3p 4s
d. 1s22s22p63s23p6
How many energy sublevels are in the second principal energy level?
a. 4
c. 2
b. 1
d. 3
Thorium-234 has a half-life of 24 days. If you started with a 100-g sample of thorium-234, how much would
remain after 48 days?
a. 10 g
c. 25 g
b. 100 g
d. 50 g
____ 14. How do the isotopes hydrogen-1 and hydrogen-2 differ?
a. Hydrogen-2 has one more electron than hydrogen-1.
b. Hydrogen-2 has one proton; hydrogen-1 has none.
c. Hydrogen-2 has one neutron; hydrogen-1 has none.
d. Hydrogen-2 has two protons; hydrogen-1 has one.
____ 15. Which of the following electron transitions for the hydrogen atom would be associated with the greatest
energy of emitted light?
a. n = 5 to n = 1
c. n = 4 to n = 5
b. n = 5 to n = 4
d. n = 2 to n = 5
____ 16. In which of the following sets are the charges given correctly for all the ions?
a. Rb , Ba , P
c. N , O , F
b. K , Sr , O
d. Na , Mg , Al
____ 17. What does the number 84 in the name krypton-84 represent?
a. the mass number
c. the atomic number
b. twice the number of protons
d. the sum of the protons and electrons
____ 18. The atomic mass of an element is the ____.
a. total mass of the isotopes of the element
b. average of the mass number and the atomic number for the element
c. total number of subatomic particles in its nucleus
d. weighted average of the masses of the isotopes of the element
____ 19. Of the elements Fe, Hg, U, and Te, which is a representative element?
a. Fe
c. Hg
b. U
d. Te
____ 20. The electron configuration of a fluoride ion is ____.
a. the same as that of a potassium ion
c. 1s22s22p63s1
b. 1s22s22p3
d. the same as that of a neon atom
____ 21. To what element does polonium-208 decay when it emits an alpha particle?
a.
c.
Po
Pb
b.
d.
Pb
Rn
____ 22. How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125
contain?
a. 50 protons, 50 electrons, 75 neutrons
c. 75 electrons, 50 protons, 50 neutrons
b. 120 neutrons, 50 protons, 75 electrons
d. 70 neutrons, 75 protons, 50 electrons
____ 23. In Bohr's model of the atom, where are the electrons and protons located?
a. The electrons occupy fixed positions around the protons, which are at the center of the
atom.
b. The electrons and protons move throughout the atom.
c. The electrons and protons are located throughout the atom, but they are not free to move.
d. The electrons move around the protons, which are at the center of the atom.
____ 24. Which of the following elements is in the same period as phosphorus?
a. oxygen
c. magnesium
b. nitrogen
d. carbon
____ 25. How many unpaired electrons are in a sulfur atom?
a. 3
c. 0
b. 2
d. 1
____ 26. Emission of light from an atom occurs when an electron ____.
a. falls into the nucleus
b. moves within its atomic orbital
c. jumps from a lower to a higher energy level
d. drops from a higher to a lower energy level
____ 27. What must be done to be certain that a chemical change has taken place?
a. Demonstrate that a release of energy occurred after the change.
b. Check for the production of bubbles before and after the change.
c. Check the composition of the sample before and after the change.
d. Demonstrate that energy was absorbed by the reactants after the change.
____ 28. How are the frequency and wavelength of light related?
a. They are inversely proportional to each other.
b. They are directly proportional to each other.
c. Wavelength is determined by dividing frequency by the speed of light.
d. Frequency equals wavelength divided by the speed of light.
____ 29. Which of the following elements is a transition metal?
a. tellurium
c. tin
b. copper
d. cesium
____ 30. What is the approximate energy of a photon having a frequency of 4 10 Hz? (h = 6.6 10
a. 3 10 J
c. 3 10 J
b. 3 10 J
d. 2 10 J
____ 31. Of the elements Pt, V, Li, and Kr, which is a nonmetal?
a. Kr
c. Pt
b. V
d. Li
____ 32. The smallest particle of an element that retains the properties of that element is a(n) ____.
a. proton
c. electron
b. neutron
d. atom
____ 33. When an iron nail is ground into powder, its mass ____.
a. cannot be determined
c. increases
b. stays the same
d. decreases
____ 34. What particle is needed to complete the following nuclear equation?
Mn
____ + e
a.
c.
Co
Fe
b.
Cr
d.
J s)
Mn
____ 35. If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed in
the three orbitals?
a. two electrons in one orbital, one in another, none in the third
b. three in one orbital, none in the other two
c. one electron in each orbital
d. Three electrons cannot fill three empty 2p atomic orbitals.
____ 36. What is the maximum number of f orbitals in any single energy level in an atom?
a. 5
c. 3
b. 7
d. 1
____ 37. Which of the following sets of symbols represents isotopes of the same element?
a.
c.
M
M
M
L
L
L
b.
d.
Q
Q
Q
J
J
J
____ 38. An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the
element are ____.
a. 76 protons and 0 electrons
c. 38 protons and 38 electrons
b. 152 protons and 76 electrons
d. 76 protons and 76 electrons
____ 39. What element has the electron configuration 1s 2s 2p 3s 3p ?
a. selenium
c. silver
b. silicon
d. nitrogen
____ 40. Which type of electromagnetic radiation includes the wavelength 10 m?
a. microwave
c. visible light
b. gamma ray
d. radio wave
____ 41. Which of the following is true about the electron configurations of the noble gases?
a. The highest occupied s and p sublevels are partially filled.
b. The highest occupied s and p sublevels are completely filled.
c. The electrons with the highest energy are in an f sublevel.
d. The electrons with the highest energy are in a d sublevel.
____ 42. Which of the following isotopes has the same number of neutrons as phosphorus-31?
a.
c.
Si
S
b.
d.
Si
P
____ 43. What is the maximum number of orbitals in the p sublevel?
a. 3
c. 2
b. 4
d. 5
____ 44. All atoms of the same element have the same ____.
a. mass
c. number of neutrons
b. mass numbers
d. number of protons
____ 45. Isotopes of the same element have different ____.
a. numbers of protons
c. numbers of electrons
b. numbers of neutrons
d. atomic numbers
____ 46. How many valence electrons are in an atom of phosphorus?
a. 5
c. 3
b. 2
d. 4
____ 47. Which of the following is a physical change?
a. evaporation
c. corrosion
b. rotting of food
d. explosion
____ 48. Which of the following is NOT a physical change?
a. mixing two cheeses in a bowl
c. grating cheese
b. fermenting of cheese
d. melting cheese
____ 49. Which color of visible light has the shortest wavelength?
a. green
c. blue
b. violet
d. yellow
____ 50. Which of the following statements is true about ions?
a. Cations form when an atom loses electrons.
b. Anions form when an atom gains protons.
c. Cations form when an atom gains electrons.
d. Anions form when an atom loses protons.