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Duplicate of The Atom and The Mole--College Prep Flashcards | StudBud
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Duplicate of The Atom and The Mole--College Prep
Duplicate of The Atom and The Mole--College Prep
20 terms
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A review of the atom and the mole
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
The total number of protons and neutrons in the nucleus of an atom is:
mass number
Avogadro's number
average atomic mass
atomic number
2
The atomic symbol for beryllium,
9
4
Be, indicates that the:
atomic number is 4
mass number is 4
atomic number is equal to 9 - 4
atomic number is 9
3
In N
2
O, NO, NO
2
and N
2
O
5
, atoms combine in whole-number ratios. This supports the law of:
conservation of mass
mass action
multiple proportions
definite composition
4
Experiments with cathode rays led to the discovery of the:
neutron
electron
nucleus
proton
5
Which concept in Dalton's atomic theory has been modified?
Atoms of dif. elements have different properties & masses
Atoms can combine in chemical reactions.
All matter is composed of atoms.
Atoms cannot be divided.
6
The units of molar mass are:
g/mol
mol/g
amu/g
amu/mol
7
An atom of potassium has 19 protons and 20 neutrons. Its mass number is:
19
39
20
9
8
Neutral atoms contain equal numbers of:
protons and electrons
protons, electrons and neutrons
electrons and neutrons
protons and neutrons
9
The atomic number of oxygen is 8. This indicates that in oxygen there are eight:
energy levels in an oxygen atom
protons in the nucleus of an oxygen atom
neutrons in an oxygen atom's nucleus
oxygen isotopes.
10
Protons in an atom are held together by:
magnetic forces
nuclear forces
gravity
electric forces
11
Molar mass is:
numerically equal to average atomic mass
none of these
the mass in grams of one mole of the element
two of these
12
Isotopes are atoms of the same element that have different:
atomic numbers
chemical properties
charges
masses
13
Rutherford's gold foil experiment led him to conclude that:
alpha particles were a poor choice of bombardment material
Thomson's plum pudding model of the atom was accurate
light was emitted by electrons returning to a ground state.
a dense region of positive charge is somewhere in the atom.
14
The average atomic mass of an element is:
the sum of the neutrons and protons of an element
the same as the atomic number of the element
weighted avg of naturally occurring isotopes of the element
the mass of one isotope of the element
15
The molar mass of an element is numerically equal to:
the element's average atomic number
the percentage composition of the element by mass
the element's average atomic mass
the number of electrons possessed by an element
16
When sodium, hydrogen and oxygen react to form a compound, the mass of the compound will be:
less than or equal to the sum of the masses of the reactants
less than the sum of the masses of the reactants
greater than the sum of the masses of the reactants
equal to the sum of the masses of the reactants
17
The least massive particle in the atom is the:
electron
proton
positron
neutron
18
The number of atoms in one mole of any pure substance is called:
mass number
its gram number
Avogadro's number
atomic number
19
A nuclear particle with about the same mass as a proton, but with no charge, is called a(n):
isotope
electron
nuclide
neutron
20
According to the law of definite proportions, any two samples of KCl will have:
the same elements in the same proportions by mass
slight different molecular structures
different densities
the same mass.
