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Chemistry Unit 2 Test
9th - 12th grade.
27 questions
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the smallest unit of matter that maintains its chemical identity.
the smallest unit of a compound.
always made of carbon.
smaller than an electron.
Which of the following statements is true according to modern atomic theory?
Atoms of the same element may have different masses.
Atoms may be divided in ordinary chemical reactions.
Atoms can never combine with any other atoms.
Cathode rays are composed of protons..
A positively charged particle with mass 1.673 ´ 10–24 g is a(n)
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
The nucleus of an atom has all of the following characteristics except that it
is positively charged.
is very dense.
contains nearly all of the atom's mass.
contains nearly all of the atom's volume.
An atom is electrically neutral because
neutrons balance the protons and electrons.
nuclear forces stabilize the charges.
the numbers of protons and electrons are equal.
the numbers of protons and neutrons are equal.
Most of the volume of an atom is occupied by the
The charge due to the electrons of a neutral atom
prevents compounds from forming.
balances the charge on the nucleus.
attracts electrons in other atoms.
does not exist.
The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
Isotopes are atoms of the same element that have different
principal chemical properties.
numbers of protons.
numbers of electrons.
All isotopes of hydrogen contain
one neutron.
two electrons.
one proton.
two nuclei.
The atomic number of oxygen, 8, indicates that there are eight
protons in the nucleus of an oxygen atom.
oxygen nuclides.
neutrons outside the oxygen atom's nucleus.
energy levels in the oxygen atom's nucleus.
The total number of protons and neutrons in the nucleus of an atom is its
atomic number.
Avogadro number.
mass number.
average atomic mass.
As the atomic number increases, the number of electrons in a neutral atom
remains the same.
is undetermined.
All atoms of the same element have the same
atomic mass.
number of neutrons.
The average atomic mass of an element is the average of the atomic masses of its
naturally occurring isotopes.
two most abundant isotopes.
radioactive isotopes.
artificial isotopes.
The atomic mass of an element listed in the periodic table is the
relative atomic mass of the most abundant isotope.
relative atomic mass of the most abundant radioactive isotope.
mass number of the least abundant isotope.
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
Chlorine has atomic number 17 and mass number 35. It has
17 protons, 17 electrons, and 18 neutrons.
35 protons, 35 electrons, and 17 neutrons.
17 protons, 17 electrons, and 52 neutrons.
18 protons, 18 electrons, and 17 neutrons.
What is the relative charge of an electron?
What is an amu
atomic mass unit
all matter unit
all must unite
atomic measurement universal
What unit is used for frequency?
What the the constant for speed of light we use for calculations?
6.626e-34 J.s
The smallest quantity of energy that can be released or absorbed by atoms is called
plank’s constant
What is an individual particle of light called?
More than one answer for this question: Which of the following is an example of electromagnetic radiation?
radio waves
visible light
More than one answer for this question: Light can behave as both of what?
straight line
interdimensional time portal
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