Which of these statements about density is true?

Density may be used to help identify a material.

The average atomic mass of an element is

the weighted average of all naturally occurring isotopes of the element.

Which of the following changes is a chemical change of matter?

vinegar combining with baking soda to produce carbon dioxide

What is the difference between a mixture and a compound?

Mixtures can be separated by physical processes.

According to the law of definite proportions, any two samples of KCI will have

the same elements in the same proportions by mass.

an objects weight is the measure of

the force with which it is attracted by gravity

Millikan's experiments led to the determination

of the approximate value of the electron's mass.

In general, which properties are common to elements within a single group on the periodic table?

chemical properties and ability to bond to other atoms

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Honors chemistry 1 midterm

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1
The SI base units for time and temperature are
hour and degree celcius
second and degree celcius
hour and kelvin
second and kelvin
2
The atomic symbol for beryllium, 9/4 Be indicates that the
mass number is 4
atomic number is 9
atomic number is 4
atomic number is equal to 9-4
3
Which of these statements about density is true?
density is proportional to the amount of a substance.
Density does not change with temperature
Density is expressed in units of mL/cm3.
Density may be used to help identify a material.
4
The average atomic mass of an element is
the weighted average of all naturally occurring isotopes of the element.
the sum of the number of neutrons and protons in an atom.
the mass of one isotope of the element
the same as the atomic number of the element.
5
Which of the following changes is a chemical change of matter?
ice melting and producing water
liquid silica solidifying to form glass
water boiling to make water vapor
vinegar combining with baking soda to produce carbon dioxide
6
The conversion factor 1L/10³mL would be used to change
liters to milliliters
milliliters to liters
units of volume to units of length.
units of length to units of volume.
7
ax Planck proposed that "hot" objects radiate energy in small, specific amounts called
quanta
waves
hertz
electrons
8
An orbital that would never exist in the quantum description of an atom is
8s
6d
3f
3d
9
Which of these shows SI unit prefixes arranged in order frotn smallest to largest?
kilo, centi, milli
kilo, milli, centi
centi, milli, kilo
milli, centi, kilo
10
When electromagnetic radiation strikes the surface of a metal, electrons are ejected from the metal's surface. This is
photoelectric effect
quantum theory
effects of diffraction
aufbau principle
11
A sample of bismuth has a mass of 343 g and a volume of 35.0 cm3 What is the density of bismuth?
9.80 g/cm³
378 g/cm³
1.20 x 10⁴ g/cm³
o.102g/cm³
12
When 6.02 x 1023 is multiplied by 9.1 x 10-31, the product is
5.5 x 10⁵5
5.5 x 10⁻7
5.5 x 10 ⁻53
5.5 x 10⁻8
13
What is the difference between a mixture and a compound?
Mixtures can be separated by physical processes.
all mixtures are heterogeneous.
Mixtures are made of at least two different elements.
a. All mixtures have a uniform composition.
14
According to Einstein, which of the following can behave like a wave and also like a stream of particles?
a hydrogen atom in the ground state
the atomic nucleus
a noble gas
electromagnetic radiation
15
To find a safer chemical for industrial purposes, a scientist is working with chemicals that do not cause depletion of
technological development
applied research
basic research
16
In which of the following measurements are all the zeros considered to be nonsignificant figures?
0.0037
400.
60.0
506
17
An atom of potassium has 19 protons and 20 neutrons. Its mass number is
20
39
9
19
18
Phosphorus-33 (atomic number 15) contains
33 protons
18 nuetrons
18 protons
33 nuetrons
19
The number of significant figures in the measurement IÄ() km is
6
4
3
5
20
Whenever an excited hydrogen atom returns from an excited state to its ground state, it
absorbs specific frequencies of light
emits a photon of radiation
emits radiation over a range of frequencies
absorbs a photon of radiation
21
According to the law of definite proportions, any two samples of KCI will have
slightly different molecular structures but the same two elements.
the same mass
the same elements in the same proportions by mass.
different densities
22
In which orbital(s) are all the inner-shell electrons located in an atom of magnesium that is in the ground state?
1s
1s,2s
1s, 2s, 2p, 3s
1s, 2s, 2p
23
What is the correct electron configuration for a ground-state atom with 7 electrons?
Is²2s²2p²3s¹
I s²2s⁵
I s²2s³2p²
ls²2s²2p³
24
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
40
13
27
14
25
Which are the sublevels in an energy level of n x 3?
s,p, and d
p,d, and f
s,d, and f
s,p, and f
26
An element near argon in the periodic table would probably be
shiny and malleable
a poor heat conductor
solid
a good electrical conductor
27
the si base unit for mass is
meter
gram
kilogram
cubic meter
28
A photon is emitted from a gaseous atom when an electron moves to its ground state from a(n)
excited state
n=0 state
less energetic state
inner shell
29
an objects weight is the measure of
the force with which it is attracted by gravity
the pressure exerted on a scale
the amount of material per unit volume
the force causing the object to move
30
most of the volume of an atom is occupied by the
protons
electrons
nucleus
nuclides
31
When electrons change energy states, the amount of energy given off or absorbed is equal to
cv
n
hv
hc
32
The measurement 0.0265 g, rounded off to two significant figures, would be
0.03 g
0.026 g
0.030 g
0.027 g
33
Millikan's experiments led to the determination
of the approximate value of the electron's mass.
that the electroin has no mass
that the electron carries no charge.a.
of the electron's positive charge.
34
Neutral atoms contain equal numbers of
protons and electrons
protons electrons and nuetrons
protons and nuetrons
electrons and nuetrons
35
The ancient Greek natural philosopher who first proposed the notion of the atom was
socrates
plato
aristotle
democritus
36
The basic principles of atomic theory were first conceived by
avogadro
bohr
dalton
rutherford
37
In general, which properties are common to elements within a single group on the periodic table?
atomic number and atomic weight
boiling and freezing point
color and luster
chemical properties and ability to bond to other atoms
38
Which of the following is a pure substance?
granite
air
stainless steel
water
39
which of these is not a si unit
meter
ampere
kelvin
pound
40
The total number of orbitals that can exist at a given main energy level, n, is equal to
n-1
2n²
n
n²
41
Which of the following is an extensive property of matter?
melting point
volume
density
boiling point
42
The dimensions of rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as
4.1 cm³
4.13 cm³
4.12 cm³
4.128 cm³
43
Which of the following is an example of a heterogeneous mixture?
gold ring
water
tap water
chunky peanut butter
44
At sea level, water boils at 100 degrees C. This is an example of a(n)
physical property
chemical change
extensive property
chemical property
45
The number of atoms in I mol of carbon is
5.022 x 10^23
6.022 x 10^23
5.022 x 10^22
6.022 x 10^22
46
Research that is carried out for the sake of increasing knowledge, such as research into the properties of a substance
technological development
applied research
basic research
47
A homogeneous mixture is one that
is uniform in composition
contains only one element
cannot change state easily
acts as solvent
48
A scientist is working in the lab, with compounds containing carbon. She is most likely working in the field of
organic chemistry
inorganic chemistry
theoretical chemistry
49
. Which of these recorded observations is qualitative, rather than quantitative?
the solid has a mass of 23.4g
the compound melts at 87.5C
Iron is denser that aluminum
a chemical reaction is complete in 2.3s
50
How many possible orientations does an s orbital have?
1
5
3
2
51
The distance between corresponding points on adjacent waves is the wave's
energy
wavelength
frequency
speed
52
Which process is a chemical change?
heating to boiling
dissolving in alcohol
burning in air
slicing in two pieces
53
Compared with a mole of lead atoms, a mole of iron atoms
has the same number of atoms
has more atoms
has fewer atoms
cannot be determined
54
The branch of chemistry called analytical chemistry most likely would be used in determining the
economic effects of a new substance.
effect of a chemical compound on living things.
uses of a particular metal.
chemical compostition of a new substance
55
What is the highest occupied energy level in an atom of strontium in its ground state?
n=4
n=3
n=6
n=5
56
The average atomic mass of an element is the average of the atomic masses of its
radioactive isotopes
two most abundant isotopes
naturally occuring isotopes
artificial isotopes
57
Which of these is an example of an extensive property?
color
mass
boiling point
density
58
Neon-22 contains 12 neutrons. It also contains
22 electrons
10 protons
22 protons
12 protons
59
Thomson's experiment showed that the charge-to-mass ratio of electrons was
the same in all gases
dependent on the elementś atomic mass
greater with noble gases than for other gases
less with noble gases than for other gases
60
When an atom in an excited state emits a photon of radiation, the energy of the photon is equal to the
difference in energy between the atoms excited state and its final state.
energy of the atom's final state.
total energy of the atom's excited state and its final state.
energy of the atom's excited state.
61
What is the total number of electrons needed to fill the fourth main energy level?
8
4
32
16
62
The theory that light behaves as a wave is best illustrated by the
lyman, balmer, and paschen series
interference of light
photoelectric effect
emission of electromagnetic radiation by a hot body.
63
Homogeneous mixtures are also called
molecules
atoms
solutions
compounds
64
The horizontal rows of the periodic table are called
periods
columns
families
groups
65
In division and multiplication, the answer should have the same number of significant figures as the
number in the calculation with the fewest significant figures.
number in the calculation with the most significant figures.
total number of significant figures in the calculation.
average number of significant figures in the calculation.
66
noble gases are generally
semiconductors
malleable
unreactive
brittle
67
The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 amu) is
16 g
64g
32g
48g
68
which is an example of a non metal
copper
cadmium
mercury
phosphorus
69
Which of the following types of electromagnetic radiation has the lowest frequency?
unltraviolet light
microwaves
infrared light
x rays
70
The least massive particle in an atom is the
proton
electron
nuetron
71
Chlorine has atomic number 17 and mass number 35. It has
17 protons, 17 electrons, and 18 neutrons.
18 protons, 18 electrons, and 17 neutrons.
17 protons, 17 electrons, and 52 neutrons.
35 protons, 35 electrons, and 17 neutrons.
72
Rutherford's gold-foil experiment led him to conclude that
alpha particles were a poor choice for a bombardment material.
a dense region of positive charge existed somewhere in the atom.
Thomson's plum pudding model of the atom was accurate.
light was emitted by electrons returning to ground state.
73
To determine the mass in grams of an atom of any element, you would
multiply the mass of a mole of the element by Avogadro's number.
subtract the mass of a mole of the element from Avogadro's number.
add the mass of a mole of the element to Avogadro's number.
divide the mass of a mole of the element by Avogadro's number.
74
the units of molar mass are
mol/g
amu/g
g/mol
amu/mol
75
Which of these terms best describes the following statement? "A solutionofthe unknown compound turned litmus paper blue
quantitative
qualitative
hypthesis
model
76
A scientist is working to improve a product that uses fiber optics. This is an example of
applied research
both of th above
basic research
77
The branch of chemistry in which the compositions of materials are identified is known as
analytical chemistry
biochemistry
physical chemistry
organic chemistry
78
A scientist is working with mathematical and computer models to learn about the principles at work in a chemical react
biochemistry
theoretical chemistry.
physical chemistry
analytical chemistry
79
Which of these is an example of an element?
oxygen
soil
sugar
water
80
The smallest unit of matter that retains the properties of that 'natter is
an atome
a compound
a molecule
a mixture
81
The unit cm3 is used to express
length
mass
volume
time
82
The lowest energy state of an atom is its
principle quantum number
ground state
electron configuration
highest-occupied energy level
83
How many possible values are there for the spin quantum number?
2
3
5
4
84
Neutral atoms of the same element can differ in
mass number
chemical properties
number of protons and electrons
atomic number
85
The molar mass of an element is numerically equal to
the percentage composition of the element by mass.
the element's average atomic mass.
the number of electrons possessed by an element.
the element's average atomic number.
86
Every pure chemical compound consists of two or more elements that
are combined in any proportion
are combined chemically
cannot be seperated
can be seperated by physical change
87
Chemistry is a natural science that deals with the study of
the composition, motion, and relative positions of stars and planets.
the physical features of Earth.
the composition, structure, properties, and changes of matter.
living things and their life processes.
88
Which statement best describes an element?
a substance made up of only one kind of atom
any combination of two or more atoms of different types
a pure substance made up of only one kind of atom
any kind of crystal
89
If some measurements agree closely with each other but differ widely from the actual value, these measurements are
precise but not accurate
neither precise or accurate
accurate but not precise
both accurate and precise
90
Which feature of Dalton's atornic theory is different from rnodern atomic theory?
atoms cannot be subdivided
atoms cannot be rearranged in chemical reactions
atoms cannot be destroyed
atoms combine in whole-number ratios
91
Which of these is an example of a heterogeneous mixture?
air
mud
nitrogen
salt
92
0.12+1.8+0.562
2.582
2.48
2.5
2.4
93
The most massive particle in an atom is the
electron
nuetron
proton
94
Which of the following changes is a physical change of matter?
a nail rusting
paper burning
warer evaporating
a spoon tarneshing
95
Expressed in scientific notation, 0030 m is
9.3 x 10⁻3
9.30 x 10⁻2
93 x 10⁻3
9.30 x 10⁻4
96
Which of the following is an intensive property of matter?
energy content
volume
mass
density
97
Dalton's atomic theory helped to explain the law of conservation of mass because it stated that atoms
are indivisible
cannot be created or destroyed
cannot combine
all have the same mass
98
Which state of matter is composed of atoms that have lost many of their electrons? solid
plasma
gas
solid
liquid
99
Which of these does the angular momentum quantum number indicate?
the orientation of an orbital around the nucleus
the spin rate of an electron in an orbital
the energy level of an electron
the shape of an orbital
100
One way to separate the different kinds of matter in a mixture is through
filtration
chemical reactions
electolysis
decomposition

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