Which of the following observations is quantitative?

the liquid freezes at -10 degrees C

Which of Dalton's postulates supports the law of conservation of mass?

atoms cannot be destroyed in reactions

Chlorine-35 (atomic number 17) has

17 protons, 17 electrons, 18 neutrons

can be observed by reacting two substances

Which of the following does NOT describe the quantum atomic model?

electons' exact locations can be found

Which concept in Dalton's theory has been changed?

all atoms of the same element have the same mass

Why does atomic radius increase going down a group?

the number of energy levels increases

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KP Chemistry Midterm Review

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Questions 81

Answers

1
Which of the following observations is quantitative?
the liquid tastes sour
the liquid freezes at -10 degrees C
the liquid has a pungent odor
the liquid is clear
2
A measurement that closely agrees with an accepted value is
accurate
reproducible
significant
precise
3
Which particle has a positive charge?
proton
electron
neutron
isotope
4
The periodic law states that the properties of elements are functions of their atomic
radii
masses
structures
numbers
5
Which of Dalton's postulates supports the law of conservation of mass?
atoms cannot be destroyed in reactions
atoms cannot be divided
matter is made of atoms
different elements have different properties
6
Which of the following is a pure substance?
olive oil
table salt
a sugar cookie
black coffee
7
The number of significant figures in the measurement 2010.0 cm is
5
3
2
4
8
0.25 kg is equivalent to
250 g
0.025 g
0.025 mg
250 mg
9
Which of the following is a compound?
oxygen
salad dressing
sea water
water
10
Which of the following is a homogeneous mixture?
apple juice
chlorine gas
water
chicken noodle soup
11
The mass of 3 moles of oxygen atoms (16 g/mol) is
48 g
32 g
64 g
16 g
12
Which of the following is an extensive physical property?
luster
melting point
volume
color
13
Chlorine-35 (atomic number 17) has
18 protons, 18 electrons, 17 neutrons
17 protons, 17 electrons, 18 neutrons
35 protons, 35 electrons, 17 neutrons
17 protons, 17 electrons, 52 neutrons
14
If an atom of sodium has 11 protons and 12 neutrons, what is its mass number?
1
12
11
23
15
Within a row on the periodic table, as atomic number increases, atomic radius
stays the same
decreases
goes up, then down
increases
16
How many orbitals are in a d sublevel?
5
10
6
3
17
To which group do lithium and potassium belong?
noble gases
halogens
transition metals
alkali metals
18
When atoms go from the excited state to the ground state,
alpha particles are emitted
energy is released
energy is absorbed
electrons move from a lower to a higher energy level
19
The study of matter and the changes it undergoes best describes
biology
microbiology
physics
chemistry
20
The sum of the protons and neutrons in an atom is
the quantum number
the atomic number
the mass number
Avogadro's number
21
Chemistry is the study of all of the following except
changes in matter
projectile motion
matter
changes in energy as a result of changes in matter
22
Cu-65 (atomic number 29) has
94 neutrons
29 neutrons
65 neutrons
36 neutrons
23
Which of the following observations is qualitative?
the pH of the liquid is 9
the solid is a blue crystal
the solid has a mass of 46 g
the liquid has a volume of 23 mL
24
A physical property may be investigated by
setting paper on fire
allowing a peach to spoil
boiling water
letting rust form
25
Which scientist developed the uncertainty principle?
Einstein
deBroglie
Heisenberg
Newton
26
Atoms of the same element can have different
numbers of protons
atomic numbers
mass numbers
properties
27
Chemical properties
include length and volume
can be observed by looking at an object
can be observed by reacting two substances
can be observed by melting a solid
28
Which of the following does NOT describe the quantum atomic model?
electons' exact locations can be found
orbitals tell us the most likely location of electrons
Heisenberg contributed to it
electrons are both waves and particles
29
The elements with atomic numbers from 90-103 are the
halogens
lanthanides
actinides
alkali metals
30
To which group does chlorine belong?
alkaline earth metals
alkali metals
halogens
noble gases
31
An atom of aluminum contains 13 protons, 13 electrons, and 14 neutrons. Its atomic number is
13
40
27
14
32
What did cathode rays help discover?
electrons
protons
the nucleus
neutrons
33
Which of the following is a physical change?
a fork tarnishing
an apple going bad
a watch turning your wrist green
ice melting
34
The product of 13.0 cm and 5.70 cm is correctly reported as
74 cm2
74.1 cm2
75 cm2
74.0 cm2
35
How many moles are in 50.15 grams of fluorine? (19.00 g/mol)
2.639 mol
2.6 mol
0.3789 mol
952.9 mol
36
A packet of electromagnetic radiation is a(n)
orbital
photon
excited atom
electron
37
How many valence electrons do all atoms want?
2
8
16
4
38
If 1 inch equals 2.54 cm, how many centimeters are in 2 yards?
30.5 cm
182.8 cm
14.2 cm
91.4 cm
39
What is 1.245633501 x 10⁸ rounded to five significant figures?
1.2456 x 108
1.2456 x 104
12456
0.12456
40
Magnesium, calcium, and strontium are
halogens
actinides
alkaline earth metals
lanthanides
41
Mendeleev organized the elements based on
electron configurations
symbols
element properties
atomic number
42
Which atomic model treats electrons as waves?
Bohr's model
the quantum model
Rutherford's model
Dalton's model
43
How many atoms of Au are in 196.97 g?
2.308 x 1023 atoms
1.204 x 1023 atoms
4.306 x 1023 atoms
6.022 x 1023 atoms
44
Which concept in Dalton's theory has been changed?
all atoms of the same element have the same mass
atoms are rearranged in chemical reactions
atoms of different elements have different masses
matter is made of atoms
45
A horizontal row in the periodic table is called a(n)
period
octet
group
family
46
A volume of 1 milliliter is equivalent to
1 liter
1 cubic centimeter
0.1 cubic decimeters
1 gram
47
The SI base unit for amount of a substance is the
mole
formula unit
particle
gram
48
Which of the following is held together by chemical bonds?
sugar dissolved in tea
the elements in water
the oil and vinegar in salad dressing
dust particles in the air
49
What is the energy needed to remove an electron?
electronegativity
ionization energy
radiant energy
electron affinity
50
Why does atomic radius increase going down a group?
the number of energy levels increases
the number of protons increases
the number of neutrons increases
effective nuclear charge increases
51
Gallium is in period
5
3
4
13
52
How many orbitals are in the f sublevel?
7
10
14
6
53
Elements that touch the staircase are
gases
metals
metalloids
nonmetals
54
Elements in the same group have similar
masses
properties
number of energy levels
atomic numbers
55
Matter includes all of the following except
sunlight
ice
air
smoke
56
How many electrons can fit in an s sublevel?
1
3
6
2
57
In the Bohr model, electrons circle the nucleus
as waves in orbitals
slowly
counterclockwise
in specific, allowed orbits
58
Who based his periodic table on number of protons?
Mendeleev
Mosely
Dobereiner
Newlands
59
The part of the atom where electrons can't go is the
area outside the nucleus
nucleus
electron cloud
energy levels
60
Filtration could be used to separate a(n)
compound
mixture
element
pure substance
61
Elements on the left side of the table are
gases
nonmetals
metals
metalloids
62
Rutherford's conclusion about the atom was that
there are no charged particles in atoms
electrons are in the nucleus
atoms cannot be divided
atoms are mostly empty space
63
The number of significant figures in the measurement 0.00067 is
5
6
3
2
64
Sulfur-34 (atomic number 16) has
18 protons
34 protons
16 protons
50 protons
65
Where can an electron most likely be found?
the electron configuration
the electron cloud
the quantum
the nucleus
66
How many electrons can fit in the fourth energy level?
32
18
8
2
67
Rutherford discovered
the cathode ray
the nucleus
the electron
the quantum model
68
Which law states that the amount of matter in the universe is constant?
the law of conservation of mass-energy
the law of definite proportions
the law of conservation of mass
the law of conservation of energy
69
Isotopes of the same element have different
numbers of electrons
masses
properties
atomic numbers
70
How many orbitals are in the second energy level?
8
4
3
2
71
Which of the following is an intensive physical property?
density
length
volume
mass
72
Which of these measurements has been expressed to four significant figures?
0.052 g
3.065 g
2020 g
5000 g
73
If electrons in an atom have the lowest possible energies, the atom is in the
radioactive state
reactive state
ground state
excited state
74
How many sublevels are in the third energy level?
1
4
3
2
75
Which of the following is a chemical change?
sugar dissolving in coffee
a pot of water boiling on the stove
condensation forming on your windshield
a leaf changing color
76
When 64.40 is divided by 200, the correct number of significant figures in the result is
1
4
3
5
77
Thomson's experiments
showed that electrons are negatively charged
showed that electrons are positively charged
showed that the electron has no charge
showed that electrons have no mass
78
Energy contained in chemical bonds is
kinetic energy
potential energy
thermal energy
radiant energy
79
Within a group, as atomic number increases, atomic radius
increases
goes up, then down
decreases
remains constant
80
A student produces 5.0 g NaCl in the lab but should have produced 7.60. What is the % yield?
66 %
152 %
150 %
65.8 %
81
A chemical property of matter is
odor
density
flammability
boiling point

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