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dimensional analysis and chapter 4 Flashcards | StudBud
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dimensional analysis and chapter 4
dimensional analysis and chapter 4
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dimensional analysis and atomic structure
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40 cards
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Questions
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Answers
1
Which of the following are not SI units?
meter
grams
inches
second
2
If you are converting gigaliters to centiliters which conversion factors can we use?
1 GL = 106 L
1 GL/109 L
1 GL/106 L
1 GL = 109 L
3
Who was the author of the plum pudding model?
James Chadwick
J.J. Thomson
Rutherford
Eugen Goldstein
4
Consider
23
11
Na. How would you re-write this?
Na - 23
1123Na
1211Na
Na - 11
5
Which is an incorrect definition of mass number?
mass # = p+ + n0
mass # = A
mass number is the difference between the #p+ and the #n0
mass # = Z + n0
6
Which was NOT a result of the gold foil experiment?
Discussion about the placement of subatomic particles.
Some of the alpha particles deflected off the gold foil.
Most of the alpha particles went through the gold foil.
Most of the alpha particles deflected off the gold foil.
7
Who was the first to assume the existence of atoms?
Democritus
j.j. Thomson
Aristotle
Dalton
8
Element Sandy has an atomic mass of 123.97. Which isotope is more abundant in nature?
Sandy B w/ an atomic mass of 122.00
Sandy D w/ an atomic mass of 219.99
Sandy A w/ an atomic mass of 125.88
Sandy C w/ an atomic mass of 124.22
9
The diameter of Neptune is 1.3 x 10
4
km. What is the diameter expressed in meters?
1.3 x 108
1.3 x 106 m
1.3 x 104
1.3 x 107 m
10
When does Z not tell us the amount of electrons in an atom?
when we form isotopes
when we add neutrons to the nucleus
when we change the element
when we have a charged specie
11
Which is the correct factor for nano?
10-2
10-9
109
10-6
12
What did J.J. Thomson not discover?
the location of a proton
the charge of a proton
the charge of an electron
he discovered all three of these
13
Which of the following can we NOT obtain from the mass number and the atomic number?
neutrons
electrons
you can obtain them all
protons
14
Consider Br-35. What does the number behind Br mean?
It is Bromine's mass number
It is Bromine's atomic mass
It is Bromine's atomic number
It is the number of neutrons Bromine has
15
Which is the correct manipulated equation to solve for the number of neutrons?
n0 = Z + p+
n0 = Z - A
n0 = -Z + A
n0 = A + Z
16
Gold has 79 electrons and 118 neutrons. What is its mass and atomic number?
Z = 118 A = 79
Z = 79 A = 118
Z = 79 A = 197
Z = 197 A = 79
17
What was wrong about Dalton's atomic theory?
He concluded that elements can chemically combine
He stressed that atoms of the same element are identical.
He noticed that protons have a negative charge rather than +
He noticed that elements are indivisible.
18
How are isotopes formed?
by changing the identity of an element
by exposing it to cathode rays
by changing the amount of neutrons
by creating a charged atom
19
Element X has 45 n
0
and an A value of 80. What element is element X?
Krypton
Mercury
Bromine
Rhodium
20
What is the smallest particle of an element that contains its identity?
compounds
protons
atoms
mixtures
21
What did the cathode ray experiment discover about the electron?
its charge
its mass
its speed
its location
22
Consider
131
54
Xe. How many electrons does it have?
less than the amount of neutrons
77
131
the superscript value
23
Which of the following is not considered to be a subatomic particle?
J.J. thomson's 1st discovery
the positively charged dough in the plum pudding model
the segment that allowed alpha rays to go threw the gold
the particle that can change at atom's identity
24
What is the correct shorthand notation for an element with 9 protons and 10 neutrons?
199F
109F
Fluorine-9
1910F
25
What does Z not tell us?
the identity of an element
the amount of neutral particles in an atom
the amount of negatively charged particles in an atom
the amount of positively charged particles in an atom
26
What is the correct symbol for kilo?
k
103
grams
K
27
Element Germanium has an atomic number of 15..what is false?
Z = 15
it is neutral
it has 15 protons around its nucleus
it has 15 electrons around its nucleus
28
What is one of the reasons why Democritus's theory not accepted by the public?
Aristotle was more influential than he was.
all of the above
He used too much experimental data to prove his point.
His experimental procedures proved false.
29
What do you not have to consider when solving for the atomic mass of an element?
its ions
its isotopes
the abundances of its isotopes
the different versions of the same element
30
Which of the following is NOT a step when showing work for conversion problems?
Set up an algebraic expression.
Write the question out.
State what you know.
Show which conversion factor you're using.
31
convert 0.107 g to cg.
1.7 cg
10.7 cg
0.17 cg
100.7 cg
32
If you wanted to condense a massive number what technique would you use?
scientific notation
a calculator
conversion factors
dimensional analysis
33
The diameter of the tip of a ball point pen is 0.073 cm. What is the diameter in micrometers?
730 micrometers
73 micrometers
7,300 micrometers
.73 micrometers
34
Express 75 dg in grams.
7.5 g
75 g
.75 g
750 g
35
Which is not similar between isotopes of the same element?
the size of the nucleus
the chemical properties
the number of electrons
the number of protons
36
Which of the following is true regarding the plum pudding model?
neutrons were said to the raisins
electrons were said to be the dough
protons were said to be the raisins
protons were said to be the dough
37
What is the mass of a proton?
less than an electron
the same mass as an electron
greater than a neutron
the same mass of a neutron
38
In the gold foil experiment, what did the results show?
They showed that the plum pudding model was wrong
They showed that majority of the atom is dense, the nucleus
They showed that the charge of electrons are negative
They showed that a small fraction of the atom is empty space
39
When writing shorthand notations which number stresses the number of neutrons?
the atomic number
the subscript
the element symbol
the superscript
40
Chromium has an atomic number 24, and a mass number of 52. List its subatomic particles.
#p+ = 24 #e- = 24 #n0 = 28
#p+ = 24 #e- = 24 #n0 = 52
#p+ = 28 #e- = 28 #n0 = 24
#p+ = 24 #e- = 25 #n0 = 52
