Which conclusion is based on the gold foil experiment?

an atom is mainly empty space and the nucleus has a positive charge

According to the kinetic molecular theory, the particles of an ideal gas

have no attractive forces between them

Which statement describes two isotopes of carbon?

the isotopes have different number of neutrons & the same atomic number

F + F --> F2 Which statement describes the changes that occur during this reaction?

a bond is formed as energy is released

Which statement concerning elements is true?

All atoms of a given element must have the same atomic number

An atom is neutral because

number of protons equals the number of electrons

Which statement describes a solution of sodium chloride in water?

the mixture is homogeneous and cannot be separated by filtration

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Midterm Review

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Questions 18

Answers

1
Which subatomic particles were discovered as the result of experiments with cathode ray tubes?
neutrons
protons
positrons
electrons
2
Which electron configuration represents excited state?
2-8-8-1
2-8-9-2
2-8-2
2-7-3
3
Which conclusion is based on the gold foil experiment?
an atom is mainly empty space and the nucleus has a positive charge
an atom is mainly empty space and the nucleus has a negative charge
an atom has hardly any empty space and the nucleus has a positive charge
an atom has hardly any empty space and the nucleus has a negative charge
4
According to the kinetic molecular theory, the particles of an ideal gas
do not transfer energy when the particles collide
constantly move in circular paths
have no attractive forces between them
are separated by small distances relative to their size
5
Which statement describes two isotopes of carbon?
the isotopes have different number of neutrons & the same atomic number
the isotopes have the same number of neutrons &have the same atomic number
the isotopes have the same number of neutrons & different atomic number
the isotopes have different # of neutrons & have different atomic number
6
Which element has chemical properties most similar to sodium?
rubidium
magnesium
phoshorous
oxygen
7
F + F --> F2 Which statement describes the changes that occur during this reaction?
a bond is broken as energy is released
a bond is broken as energy is absorbed
a bond is formed as energy is released
a bond is formed as energy is asorbed
8
As the elements in period 2 are considered from left to right, which property generally decreases?
nuclear charge
ionization energy
electronegativity
atomic radius
9
When the Mg+2 ion becomes a Mg atom, the radius increases because the Mg+2 ion
loses 2 electrons
gains 2 electrons
loses 2 protons
gains 2 protons
10
Which subatomic particles are found in the nucleus of beryllium?
neutrons and electrons
electrons and protons
neutrons and protons
electrons and positrons
11
A potassium atom has a mass number of 37. What is the number of neutrons in this atom?
18
15
37
22
12
Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the
first shell is lower
third shell is the same
third shell is lower
first shell is the same
13
Which statement concerning elements is true?
different elements hmust have different number of isotopes
all atoms of a given element must have the same mass number
All atoms of a given element must have the same atomic number
different elements must have different numbers of neutrons
14
An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
+3
+4
-4
-3
15
An atom is neutral because
the ratio of the number of neutrons to the number of protons is 2:!
ratio of the number of neutr4ons to the number of protons is 2:1
number of protons equals the number of neutrons
number of protons equals the number of electrons
16
According to the wave mechanical model, in the ground state, where are electrons?
orbitals
first shell
second shell
nucleus
17
Under which conditions will a real gas behave more like an ideal gas?
high pressure and low temp
low pressure and low temp
high pressure and high temp
low pressure and high temp
18
Which statement describes a solution of sodium chloride in water?
the mixture is homogeneous and can be separated by filtration
the mixture is homogeneous and cannot be separated by filtration
the mixture is heterogeneous and can be separated by filtration
the mixture is heterogeneous and cannot be separated by filtration

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