Chemistry Lab Methods Practice FINAL
Name ______________________________ Period:_____
Do your best to answer all of these questions. Use your notes, book, quizzes, old homework, and classmates as resources. Use as
much scratch paper as you like. This practice test is yours to write on, so do mark your questions and reminders! Please come to
class with your questions ready!
Section 1: Lab Safety and Scientific Method
Review your notes, quizzes and lab reports to prepare for these – and ALL - questions.
Section 2: Atoms and the Periodic Table
1. Noble gases are naturally:
a. Very reactive
c. Diatomic
b. Very unreactive (stable)
d. Able to make ions with multiple charges
2. What element will have the same number of valence electrons as magnesium?
a. Nitrogen
c. Chlorine
b. Sodium
d. Calcium
3. How many protons does Lead-207 have?
a. 82
c. 125
b. 207
d. -125
4. How many neutrons does Lead-207 have?
a. 82
c. 125
b. 207
d. -125
5. What is the mass number of Lead-207?
a. 82
c. 125
b. 207
d. -125
6. Which element has 9 protons?
a. Beryllium
c. Potassium
b. Fluorine
d. Neon
7. Where do you find nonmetals on the periodic table?
a. In the middle valley by transition metals
c. Along the zig-zag line
b. In the upper right corner
d. On the left of the table
8. In the periodic table, what are the columns (vertical) called?
a. Groups
c. Rows
b. Periods
d. Noble gases
Section 3: Atomic Models
9. How many electrons fit in the first (lowest) energy level?
a. 8
c. 6
b. 2
d. 1
10. The image to the right shows the model of a neutral atom of this element
a. Hydrogen
b. Neon
c. Oxygen
d. Nitrogen
e. Fluorine
11. Electrons travel between orbits of atoms and can be found in many places in-between each orbit’s energy
level at any given time.
a. True
b. False
12. Sodium has ____ electron(s) in the valence shell.
a. 1
c. 6
b. 2
d. 7
13. The image to the
a. Hydrogen
b. Nitrogen
c. Oxygen
right is a representation of this neutral atom.
d. Neon
e. Helium
Section 4: Radioactivity
14. An alpha particle is actually a(n) ____________________ .
a. Hydrogen atom
b. Positive hydrogen ion
c. Helium atom nucleus
d. Collection of only 2 neutrons and nothing else
15. When an unstable isotope undergoes beta decay the nucleus of the atom that is decaying _________ .
a. Always becomes even more unstable
c. Gains 1 more proton
b. Gains 1 more neutron
d. Gains 1 amu of mass
16. Gamma decay emits __________
a. A proton
c. Energy
b. An electron
d. A neutron
17. Rhenium 187 undergoes beta decay. What isotope of which element does it become?
a. Hydrogen-2
d. Tungsten -187
b. Carbon-14
e. Osmium -187
c. Osmiium-186
18. Which type of radiation is hardest to block or shield
a. Alpha
c. Gamma
b. Beta
d. Visible light
19. Which type of radiation involves the most massive (biggest, heaviest) particles?
a. Alpha
c. Gamma
b. Beta
d. Visible light
20. What happens to the attractive power of the strong nuclear force as the distance between 2 nucleons
increases.
a. It gets considerably weaker
b. It isn’t affected much by increasing distances between interacting particles
c. It behaves similarly to the electrostatic force and its strength diminishes over distance but still has a
significant influence over a wide range of distances.
21. What is the most common isotope of hydrogen found in nature?
a. Hydrogen-1
c. Hydrogen-3
b. Hydrogen-2
d. They are all equally abundant
22. A Uranium-238 atom will become ___________ after emitting an alpha particle.
a. It will stay uranium -239 even after
c. It will turn into uranium-234
emitting an alpha particle
d. It will turn into iron atoms
b. It will turn into thorium-234
23. The half life of radium 224 is 3.6 days while the half life of radium 226 is 1601 years. Suppose you had a 1
gram sample of each isotope. Which isotope of radium will emit more radiation in one day.
a. the radium 224
b. the radium 226
c. they will have equal radioactivity behavior since they are both samples of the same element – radium
24. Jenny found an arrow shaft in an old native American burial site and had it tested for carbon 14 content. The
report came back that the artifact had about ¼ of the radioactive material found in a modern living tree. What
would the age of the arrow be based on carbon 14 dating methods. (The accepted value for the ½ life of
carbon-14 is 5730 years)
a. 5730 years
d. 22920 years
b. 11460 years
e. 1432.5 years
c. 17190 years
25. When people do carbon 14 dating, what assumption are they making as they do their work?
a. That carbon-14 is the same as carbon-13
b. That carbon 14 is radioactive
c. That the amount of carbon 14 in the environment was the same when the organism being tested was
alive as there is now in modern times.
26. When a nucleus is stretched, the strong nuclear force
a. Weakens
c. Becomes stronger
b. Stays the same
d. Double
Section 5: Bonding and Nomenclature
27. What is the charge of the anion in Na2O?
a. +1
c. -1
b. +2
d. -2
28. Which electrons are involved in bonding to make compounds?
a. Electrons closest to the nucleus
c. Electrons in the second orbital
b. Valence electrons
d. Electrons in the first orbital
37. What is the name of the anion in K2SO4?
a. Sulfide
c. Sulfate
b. Sulfite
d. Potassium ion
41. How many electrons do most chemically stable atoms have in their outside level?
a. 2
c. 18
b. 8
d. 6
42. In the symbol Na+, the + tells us:
a. The charge on a sodium ion
c. The number of sodium atoms present
b. The number of electrons the sodium atom
d. Both A and B
lost
43. What types of elements usually form covalent compounds?
a. Metals and nonmetals
b. Nonmetals and nonmetals
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
c. Metals and metals
d. Transition metals and inner transition
metals
What is the formula for the ionic compound made of calcium and chlorine?
a. CaCl
b. Ca(II)Cl
c. CaCl2
d. Ca2Cl
How many electrons are in a single covalent bond?
a. 1
c. 3
b. 2
d. 4
In MgBr2, how many electrons did magnesium lose or gain?
a. Lost 1
c. Gained 1
b. Lost 2
d. Gained 2
Do molecules have ionic or covalent bonds?
a. Ionic
b. Covalent
c. Both
Which of these is a polyatomic ion?
a. S2c. Na+
b. SO42d. NH4Cl
What is the name of Fe2O3?
a. Iron (II) oxide
c. Iron (III) oxide
b. Iron hydroxide
d. Diiron trioxide
What is the name of AlCl3?
a. Aluminum trichloride
c. Aluminum chloride
b. Aluminum (III) chloride
d. Aluminum chlorate
What holds ionic compounds together?
a. Sharing of electrons
c. Gravitational attraction
b. Electrostatic attraction between positive
d. Nuclear strong force
and negative charges
What is the total number of protons and neutrons in an O2 molecule?
a. 24
c. 16
b. 32
d. 8
What happens if you take electrons away from an atom?
a. The atom will become a different element
c. The atom will become a positive ion
b. The atom will be an isotope
d. The atom will become a negative ion
Section 6: Chemical Reactions
54. Which of these solutions conducts electricity BEST?
a. A solution of covalently bonded sugar molecules (C12H22O11)
b. An ionic solution of NaCl
c. Deionized water
55. What does the 3 mean in 2Fe2(SO4)3?
a. Three oxygens total
c. Three sulfates for every two irons
b. Three sulfates total
d. Three molecules
56. Which of the following are not naturally occurring in pairs (diatomic)?
a. N
c. I
b. H
d. K
57. Why do we balance chemical equations?
a. Because we have to end up with as many atoms as we started with
b. Because all chemical reactions create hydrogen gas
c. Because we want to make more of the product
d. Because each compound needs to have a neutral charge
58. If this equation were balanced, what coefficient would go in front of lithium bromide?
____ LiCl + ____ Br2  ____ LiBr + ____ Cl2
a. 1
c. 3
b. 2
d. 4
59. If this equation were balanced, how many carbon dioxide molecules would be formed?
____ C4H12+ ____ O2  ____ CO2 + ____ H2O
a. 6
c. 1
b. 7
d. 4
60. When the following equation is balanced, what are the coefficients (in order from left to right)?
___ CaCO3  ___ CaO + ___ CO2
a. 2, 3, 2
c. 3, 2, 1
b. 1, 2, 2
d. None of the above
61. If this equation were balanced, what coefficient would go in front of hydrogen bromide?
___CaBr2 + ___HF  ___CaF2 + ___HBr
a. 1
c. 3
b. 2
d. 4
Section 7: Acids and Bases
62. Which of the following compounds is NOT a base?
a. NaOH
c. Ca(OH)2
b. HClO4
d. LiOH
63. If a lemon has a pH of 2.0 and a tomato has a pH of 5.0, how many times more acidic is the lemon than the
tomato?
a. 3 times more acidic
c. 100 times more acidic
b. 30 times more acidic
d. 1000 times more acidic
64. Which of the following compounds would turn orange if phenol red was added?
a. HCl
c. NaCl
b. NaOH
d. H2O
65. Which pH indicators could be used to identify an acid?
a. Phenol Red & Phenophthalein (PPH)
b. Phenol Red & Bromothymol Blue (BTB)
c. Phenophthalein (PPH) & Bromothymol Blue (BTB)
d. Phenol Red, Phenophthalein (PPH) & Bromothymol Blue (BTB)
66. The magic pitcher demo used phenolphthalein in the “drinks”. What does that tell you about the “Kool Aid”?
a. It was a base.
c. It was neutral.
b. It was an acid.
d. Doesn’t tell me anything about the “Kool Aid”.
Section 8: Thermodynamics
67. Thermal energy is the energy associated with:
a. The motion of all objects
b. The motion of microscopic particles that make up all matter
c. The motion of electrons in an atom
68. Temperature is a measure of:
a. The total thermal energy of an object or system
b. The average thermal energy of an object or system
c. The amount of thermal energy transferred into or out of an object or system
d. How cold an object or system is
69. Hot water is poured into an aluminum cup that is placed inside a bath of ice water. Heat flows:
a. From the ice water into the aluminum cup, then into the hot water.
b. From the hot water into the aluminum cup, then into the ice water.
c. From the ice water into the air.
d. Cannot predict how the heat will flow.
70. Which object has the most thermal energy?
a. An ice berg the size of the entire Liberty PAC building
b. A cup of hot tea
c. Ten liters of warm water
d. A bathtub full of room temperature water