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The mole
The mole
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Chapter 3
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
The atomic # of Ne is 10. The atomic #of Ca is 20. A mole of Ca has __ as a mole of Ne
half as many atoms
equal number of atoms
twice as many atoms
20 times as many atoms
2
A period is
another name for the periodic table.
a horizontal row of elements in the periodic table.
a vertical column of elements in the periodic table.
a region of two or more columns in the periodic table.
3
The principles of atomic theory recognized today were conceived by
Bohr
Rutherford
Avogadro
Dalton
4
Metalloids lie between metals and nonmetals on the periodic table. They tend to be
conductors
semiconductors
nonconductors
unreactive
5
A particle that has about the same mass as a proton, but no electrical charge, is called a(n)
isotope
electron
newton
neutron
6
Mendeleev predicted that the gaps in his periodic table represented
radioactive elements
ions
undiscovered elements
unstable elements
7
The periodic law states that properties of elements are periodic functions of their atomic
structures
radii
numbers
masses
8
Chlorine has atomic number 17 and mass number 35. It has
17 protons, 17 electrons, and 52 neutrons
35 protons, 35 electrons, and 17 neutrons
17 protons, 17 electrons, and 18 neutrons
18 protons, 18 electrons, and 17 neutrons
9
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
13
27
14
40
10
Which of these describes noble gases?
good conductors of electricity
good conductors of heat
unreactive
massless
11
To determine the molar mass of an element, one must know the element's
atomic number
number of isotopes
Avogadro's constant
average atomic mass
12
The “shininess” of a metal is called its
luster
color
malleability
streak
13
The person whose work led to a periodic table based on increasing atomic number was
Dalton
Moseley
Rutherford
Mendeleev
14
The mass of a sample containing 3.5 mol of silicon atoms is approximately
28 g
72 g
35 g
98 g
15
All atoms of the same element have the same
atomic number
mass number
atomic mass
number of neutrons
16
Which of the following is
not
a property of metals?
brittleness
ductile
good electrical conductivity
malleability
17
Whose series of experiments identified the nucleus of the atom?
Milikan
Dalton
Rutherford
J J Thompson
18
Which of the following is
not
true of nonmetals?
Many are ductile.
Most are poor heat and electrical conductors.
Many are gases.
As solids, they tend to be brittle.
19
The element carbon is classified as a
metal
metalloid
nonmetal
noble gas
20
Mendeleev’s periodic table grouped together elements with similar
isotopes.
atomic numbers.
names.
properties.
21
The atomic number of oxygen, 8, indicates that there are eight
oxygen nuclides.
protons in the nucleus of an oxygen atom.
neutrons outside the oxygen atom's nucleus.
electrons inside the oxygen atom's nucleus
22
The total number of protons and neutrons in the nucleus of an atom is its
molar mass
mass number
atomic number
average atomic mass
23
What is the mass of a sample of tin that contains 3.01 x 10
23
atoms?
3.01 g
72.6 g
11 g
59.3 g
24
Isotopes are atoms of the same element that have different
number of protons
masses
principal chemical properties.
number of electron
25
According to Dalton's atomic theory, atoms
can be divided
of element are identical in size, mass, and other properties
are destroyed in chemical reactions
of different elements cannot combine
26
The rays produced in a cathode tube are
unaffected by a magnetic field
found to carry a positive charge.
deflected away from a negative plate.
striking the cathode
27
Which of the following elements is a metalloid?
neon
silicon
selenium
mercury
28
How many moles of atoms are in 50.15 g of mercury
0.1001 mol
0.2500 mol
0.1504 mol
0.4000 mol
29
The molar mass of chromium is
12 g/mol
24 g/mol
6.02 x 1023 g/mol
51.99 g/mol
30
The vertical columns of the periodic table are called
groups
chemicals
rows
periods
