CHEM 219 Module 2 Exam Newest Actual
Exam Preparation Questions And Correct
Answers With Rationales | Already
Graded A+||New Version!! 2026-2027.
What is the important thing to know about the physical properties
of alkanes. - ANSWER-They will show similar trends in terms of
their physical properties.
What does the physical properties of a molecule refer to? -
ANSWER-Characteristics like melting point, boiling point, density,
solubility.
How do you compare the boiling point of alkanes? - ANSWER-The
longer the length of carbon, the higher the Boiling point. When it is
branched, it can have a higher boiling point, as long as it isn't the
parent chain that is branched.
,Are alkanes soluble in water? - ANSWER-They are water-insoluble.
Are alkanes polar or non-polar? - ANSWER-Almost non-polar
What is hydrogen bonding? - ANSWER-The water molecules are
attracted to each other like magnets because of it's electron rich O
atom possessing a -charge and its electron poor H possessing a +
charge
What will a mixture of alkane and water make? - ANSWER-A two
layer-biphasic system. It will float on top of water. since its density
is less than 1g/ml
What are hydrocarbons? - ANSWER-Molecules composed of only the
elements carbon and hydrogen
,What are the two major classes of hydrocarbons? - ANSWER-
Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons? - ANSWER-Fossil fuels
like coal, petroleum, and natural gas obtained by mining and
drilling.
The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the
same despite the fact that hafnium has 32 more protons and
electrons. Which of the following bests explains this phenomenon? -
ANSWER-Hafnium contains electrons in the 4f orbitals. These 4f
electrons do not effectively shield the higher nuclear charge and
thus Zeff is higher than might be otherwise expected.
Which of the following is true concerning successive ionizations of
an atom and its ions? - ANSWER-Each successive ionization requires
increasing amounts of energy
, The energy of a photon equals its Planck's constant (h) multiplied by
the speed of light(c) and then divided by the wavelength. E = hc/λ. If
microwaves are changed to x-rays, what effect does this have on the
energy of the photon - ANSWER-The energy of the photon increases
Photons are shone on a piece of metal and one electron is ejected for
each absorbed photon. What happens when the wavelength of light
is decreased? - ANSWER-The ejected electrons would have greater
kinetic energy
What type of light on the electromagnetic spectrum has the highest
energy per photon?
X-ray
visible light
Exam Preparation Questions And Correct
Answers With Rationales | Already
Graded A+||New Version!! 2026-2027.
What is the important thing to know about the physical properties
of alkanes. - ANSWER-They will show similar trends in terms of
their physical properties.
What does the physical properties of a molecule refer to? -
ANSWER-Characteristics like melting point, boiling point, density,
solubility.
How do you compare the boiling point of alkanes? - ANSWER-The
longer the length of carbon, the higher the Boiling point. When it is
branched, it can have a higher boiling point, as long as it isn't the
parent chain that is branched.
,Are alkanes soluble in water? - ANSWER-They are water-insoluble.
Are alkanes polar or non-polar? - ANSWER-Almost non-polar
What is hydrogen bonding? - ANSWER-The water molecules are
attracted to each other like magnets because of it's electron rich O
atom possessing a -charge and its electron poor H possessing a +
charge
What will a mixture of alkane and water make? - ANSWER-A two
layer-biphasic system. It will float on top of water. since its density
is less than 1g/ml
What are hydrocarbons? - ANSWER-Molecules composed of only the
elements carbon and hydrogen
,What are the two major classes of hydrocarbons? - ANSWER-
Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons? - ANSWER-Fossil fuels
like coal, petroleum, and natural gas obtained by mining and
drilling.
The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the
same despite the fact that hafnium has 32 more protons and
electrons. Which of the following bests explains this phenomenon? -
ANSWER-Hafnium contains electrons in the 4f orbitals. These 4f
electrons do not effectively shield the higher nuclear charge and
thus Zeff is higher than might be otherwise expected.
Which of the following is true concerning successive ionizations of
an atom and its ions? - ANSWER-Each successive ionization requires
increasing amounts of energy
, The energy of a photon equals its Planck's constant (h) multiplied by
the speed of light(c) and then divided by the wavelength. E = hc/λ. If
microwaves are changed to x-rays, what effect does this have on the
energy of the photon - ANSWER-The energy of the photon increases
Photons are shone on a piece of metal and one electron is ejected for
each absorbed photon. What happens when the wavelength of light
is decreased? - ANSWER-The ejected electrons would have greater
kinetic energy
What type of light on the electromagnetic spectrum has the highest
energy per photon?
X-ray
visible light
