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Module 1 & 2 Review
Module 1 & 2 Review
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1.01 through 2.03 review (1/24)
Flashcards
63 cards
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Practice quiz
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Questions
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Answers
1
Which block (s, p, d, or f) on the periodic table will you find iron (Fe)?
f
d
s
p
2
Answer the problem below.
Shade of brown
Volume of solutions
Number of apple slices
pH of solution
3
The true density of gold is 19 g/L. I calculated the density to be 15 g/L. What is my percent error?
-21%
-4%
21%
4%
4
The student measures the mass of a 1.00 g aluminum rod as 0.99 g. The best estimate of the percent error is:
.01%
1%
.1%
10%
5
Iodine-131 is a radioactive isotope with a halflife of 8 days. How many grams of a 64g sample will remain after 24 days?
8 g
56 g
32 g
48 g
6
Fr-223 has a half-life of 22 minutes. If the starting mass is 100g, how much Fr-223 remains after 88 minutes?
25 g
11 g
44 g
6.25 g
7
A certain isotope has a half-life of 4 minutes. How many half-lives pass after 32 minutes have elapsed?
8
16
4
12
8
A student hypothesizes that Br has different chemical properties from Kr. The periodic table supports this hypothes by-
Br is a metal while Kr is a nonmetal
Br and Kr have different numbers of valence electrons
Br and Kr are members of the same family
one mole of Br is heavier than one mole of Kr
9
Which is the highlighted block?
f
d
p
s
10
C-14 has a half-life of 5,730 years. If the original sample has a mass of 5 grams, what mass remains after 3 half-lives?
2 g
0.00087 g
1.67 g
0.625 g
11
What is the mass number of an isotope with an atomic number of 81 and that has 25 neutrons?
81
106
56
25
12
Which of these would be
best
to measure 12.6 mL of liquid ethanol?
25 mL graduated cylinder
25 mL Erlenmeyer flask
25 mL beaker
25 mL volumetric flask
13
Which of the following is a derived unit:
grams (g)
calories (cal)
grams per liter (g/L)
miles (mi)
14
What is the volume of the water in this graduated cylinder?
4.41
4.39
4.55
5.61
15
Which element does this electron orbital diagram represent?
Mn
Fe
Ca
Zn
16
Which element has 16 neutrons, 15 protons, and 15 electrons?
Zinc (Zn)
Gallium (Ga)
Phosphorus (P)
Sulfur (S)
17
What is the maximum number of electrons the p subshell can hold?
10
14
2
6
18
A botle of chemical Q spills on the floor. According to the MSDS, what is the proper response to this accident?
Absorbing chemical with inert material and dispose of it in chemical waste
Wiping up the chemical using paper towels and disposing of them in trash
Letting the chemical evaporate by blowing fans on the spill
Diluting the chemical with water & absorbing the liquid with inert material
19
Using the chart below, calculate the average atomic mass of the element.
14.0 amu
14.9 amu
1462 amu
14.6 amu
20
What is the mass of one mole of CO
2
?
44g
24g
56g
28g
21
The following results were found in a chemistry handbook. What is the independent variable in the study?
Vapor pressure
Melting point
Temperature
Molar mass
22
How many significant figures does this number have?
9
4
6
5
23
Based on its position on the periodic table, the element sulfur would be expected to have how many valence electrons?
8
4
16
6
24
Silicon and chlorine have the same number of valence electrons.
True
False
25
How many significant figures does this number have?
3
1
4
5
26
The picture shows a small section of elements from the periodic table. Which element has one more proton than element X?
4
2
3
1
27
A compound has a mass of 2.6632 x 10
2
g/mol. The number of significant figures in this mass is:
2
7
5
4
28
If a sodium atom becomes ionized, its new configuration will be the same as which element?
Neon
Magnesium
Potassium
Lithium
29
A cation (such as Ca
2+
) is smaller than the atom (Ca).
False
True
30
What is the molar mass of Zirconium (Zr)?
40.1 g/mol
174.97 g/mol
91.2 g/mol
91.2 mol/g
31
What is the answer to this question (with correct precision)?
26.0
26
26.045
26.0448
32
800 mL = _________ L
80
0.8
0.08
8
33
How many significant figures does this number have?
7
4
8
3
34
If Fr-223 releases an alpha particle, an At-219 isotope is produced.
False
True
35
What is the molar mass of carbon dioxide (CO
2
)?
32 g/mol
44 g/mol
28 g/mol
16 g/mol
36
This orbital violates which principle?
I have no idea
Aufbau principle
Pauli exclusion principle
Hund's principle
37
What is the mean of the data set?
79
31
155
25
38
The answer to this problem is correct (with correct precision).
False
True
39
What is the answer to this question (with correct precision)?
1286
1285
1285.903
1300
40
Protons and neutrons have approximately the same mass (1 amu).
True
False
41
What is the answer to this question (with correct precision)?
283,400
283,400.00
300,000
2.8340 x 105
42
Using only one trial to collect data in an experiment-
causes the conclusion to be less reliable
requires data with more significant figures
reduces the percent error in the results
makes it easier to determine a valid conclusion
43
After 1911, what led scientists to accept the theory that the nucleus of an atom was very dense with a postitive charge?
A new model proved the quantum theory of the atom was inaccurate
Scientists before 1911 used the scientific method of inquiry improperly
Rutherford did an experiment firing alpha particles at a thin gold foil
Dalton's theory of the atom was over 100 years old
44
What is the
best
use for a fume hood?
Mixing chemicals that release O2
Storing glassware
Removing toxic vapors
Covering volatile compounds
45
0.0042 is a more precise number than 132.5
True
False
46
According to the periodic table of elements, which elements belong to the same period?
Aluminum & Gallium
Potassium & Calcium
Sodium & Neon
Sulfur& Oxygen
47
A student performed a series of experiments to find the concentration of an acid. What is the mean of this data set?
0.971 M
1.00 M
0.984 M
0.976 M
48
The correct scientific notation for 0.000253 is 2.53 x 10
4
.
True
False
49
Which of the following particles has a positive one (+1) charge?
Neutron
Alpha
Electron
Proton
50
C-14 has the same number of protons as C-12.
True
False
51
_____________ of the same element have different numbers of neutrons.
Valences
Isotopes
Electron orbitals
Ions
52
Neon-24 has 10 neutrons.
False
True
53
For which characteristic is the average of the three highlighted elements equal to the value of the middle element?
Number of isotopes
Atomic mass
Atomic number
Number of neutrons
54
Which of these best describes the basis on which new scientific ideas are accepted or rejected?
Popular support
Compelling evidence
Moral and ethical beliefs
Historical support
55
I calculated the density of a sample to be 8.00 g/mL. The actual density is 7.28 g/mL. What is my percent error?
9.0%
0.72%
9.9%
91%
56
Which element is a noble gas?
Nitrogen (N)
Xenon (Xe)
Fluorine (F)
Hydrogen (H)
57
An atom contains 70 protons, 70 electrons, and 99 electrons. What is the mass number?
70
140
239
169
58
These data points are precise, but not accurate.
False
True
59
What is the length of the blue box with the correct precision?
1.256 cm
1.0 cm
1.25 cm
1.2 cm
60
The answer to this problem is correct (with the correct precision).
False
True
61
What is the abbreviated elecron configuration for As?
[Ar]4s23d104s3
1s22s22p63s23p64s23d104p3
[Kr]4s23d104s3
1s22s22p63s23p64s24p6
62
Which of these is NOT required to ensure that stock solutions are free of contamination?
Replace tops on reagent bottles after use
Never return excess chemicals to stock bottles
Do not place dropping pipettes in stock solution bottles
Store all solutions in brown bottles
63
Which subatomic particle has a 0 charge?
orbitals
neutrons
protons
electrons
