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Cem 141 mock exams
- ANS-What happens on the molecular level when thermal energy (heat) is added to change the
temperature of water from 10 ˚C to 50 ˚C?
A. The kinetic energy of water molecules increases, making the molecules collide more
forcefully with the thermometer. This forces the mercury up the capillary tube causing an
increase in the temperature scale.
B. The water molecules speed up, and collide with the thermometer, transferring energy to the
thermometer. This energy causes the mercury atoms in the thermometer to vibrate more, and
the liquid expands - thus showing an increase in the temperature scale.
C. The water molecules expand until some of the bonds holding the atoms together break.
D. The water molecules move faster and bump into each other. This bumping causes friction in
which causes heat; consequently the water temperature rises.
A - ANS-Draw out the Lewis structure of water. What is the electron pair geometry and the
shape of the species?
A. Tetrahedral, bent
B. Tetrahedral, linear
C. Linear, linear
D. Linear, tetrahedral
A - ANS-The boiling point of neon is -246°C and the melting point of neon is -249°C. What state
is neon at -260°C?
A. Solid
B. Liquid
C. Gas
A - ANS-The distance between the two helium atoms where the system would be the most
stable is:
A. Where the potential energy is at a minimum.
B. Where the kinetic energy is at a minimum.
C. Where the KE and PE are equal.
D. Where the PE is as high as possible.
A - ANS-What is the claim?
A. The atom is mostly empty space with a very small dense nucleus.
B. The atom is made of positively charged matter with electrons embedded in it.
A - ANS-What is the electron configuration of Se?
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A. [Ar] 4s2 3d10 4p4
B. [Kr] 4s2 3d10 4p4
C. [Kr] 4s2 4d10 4p4
D. [Ar] 3s2 3d10 3p4
A - ANS-What is the missing particle in this reaction?
14C 14N + ?
A. -1e (β-)
B. +1e (β+)
C. γ
D. +1p
A - ANS-What is the reasoning?
A. The positively charged alpha particles were deflected by the repulsive interaction with the
positive nucleus; since only a few were deflected the nucleus must take up a very small volume
of the atom.
B. When the alpha particles get near the nucleus they are attracted by the strong nuclear force
which alters their trajectory.
A - ANS-Which is most likely to have the lowest melting point?
A. NaBr C. LiF
B. CaO D. MgO
A - ANS-You (a human being) are what kind of
system?
A. Open
B. Isolated
C. Closed
D. It depends on whether you are
awake or asleep.
A. all are true - ANS-Which of these statements are true:
I. All neutral atoms and molecules attract each other.
II. London dispersion forces increase as the size of the electron cloud increases.
III. It takes energy to overcome the attractions between particles.
IV. Energy is released to the surroundings when atoms attract each other.
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Cem 141 mock exams.pdfCem 141
141mock
mockexams.pdf###############################################################
exams.pdfCem 141 mock exams.pdf#########################################
Cem 141 mock exams
- ANS-What happens on the molecular level when thermal energy (heat) is added to change the
temperature of water from 10 ˚C to 50 ˚C?
A. The kinetic energy of water molecules increases, making the molecules collide more
forcefully with the thermometer. This forces the mercury up the capillary tube causing an
increase in the temperature scale.
B. The water molecules speed up, and collide with the thermometer, transferring energy to the
thermometer. This energy causes the mercury atoms in the thermometer to vibrate more, and
the liquid expands - thus showing an increase in the temperature scale.
C. The water molecules expand until some of the bonds holding the atoms together break.
D. The water molecules move faster and bump into each other. This bumping causes friction in
which causes heat; consequently the water temperature rises.
A - ANS-Draw out the Lewis structure of water. What is the electron pair geometry and the
shape of the species?
A. Tetrahedral, bent
B. Tetrahedral, linear
C. Linear, linear
D. Linear, tetrahedral
A - ANS-The boiling point of neon is -246°C and the melting point of neon is -249°C. What state
is neon at -260°C?
A. Solid
B. Liquid
C. Gas
A - ANS-The distance between the two helium atoms where the system would be the most
stable is:
A. Where the potential energy is at a minimum.
B. Where the kinetic energy is at a minimum.
C. Where the KE and PE are equal.
D. Where the PE is as high as possible.
A - ANS-What is the claim?
A. The atom is mostly empty space with a very small dense nucleus.
B. The atom is made of positively charged matter with electrons embedded in it.
A - ANS-What is the electron configuration of Se?
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Cem 141 mock exams.pdf####################################################################################
141 mock exams.pdfCem 141 mock exams.pdf#########################################
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Cem 141 mock exams.pdfCem 141
141mock
mockexams.pdf###############################################################
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A. [Ar] 4s2 3d10 4p4
B. [Kr] 4s2 3d10 4p4
C. [Kr] 4s2 4d10 4p4
D. [Ar] 3s2 3d10 3p4
A - ANS-What is the missing particle in this reaction?
14C 14N + ?
A. -1e (β-)
B. +1e (β+)
C. γ
D. +1p
A - ANS-What is the reasoning?
A. The positively charged alpha particles were deflected by the repulsive interaction with the
positive nucleus; since only a few were deflected the nucleus must take up a very small volume
of the atom.
B. When the alpha particles get near the nucleus they are attracted by the strong nuclear force
which alters their trajectory.
A - ANS-Which is most likely to have the lowest melting point?
A. NaBr C. LiF
B. CaO D. MgO
A - ANS-You (a human being) are what kind of
system?
A. Open
B. Isolated
C. Closed
D. It depends on whether you are
awake or asleep.
A. all are true - ANS-Which of these statements are true:
I. All neutral atoms and molecules attract each other.
II. London dispersion forces increase as the size of the electron cloud increases.
III. It takes energy to overcome the attractions between particles.
IV. Energy is released to the surroundings when atoms attract each other.
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Cem 141 mock exams.pdf####################################################################################
141 mock exams.pdfCem 141 mock exams.pdf#########################################
