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BSC2010 Final Exam Questions Review
Marie Dennis Questions and Correct
Answers/ Latest Update / Already Graded
An ion that consists of 7 protons, 6 neutrons, and 11 electrons has a net
charge of ________.
Ans: 4-
What has the smallest total mass?
Ans: two electrons
What is true of an atom of Carbon that has 6 protons, 6 neutrons, and 6
electrons?
Ans: It has an atomic number of 6.
How is a covalent bond formed?
Ans: two atoms share two electrons [one each]
What atomic structure is shown in blue?
Ans: Electron
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In polar covalent bonds, an atom can have a partial positive charge
when it:
Ans: shares an electron with a more electronegative atom
What element does not react with other elements? [hint: atoms of this
element have already a complete valence shell]
Ans: helium
The fact that oxygen is an atom that is strongly electronegative means
that __________.
Ans: it more strongly pulls shared electrons toward itself when
forming a covalent bond with a less electronegative a tom
Adjacent water molecules interact through the ________.
Ans: electrical attraction between the hydrogen of one water
molecule and the oxygen of another water molecule
The hydrogen and oxygen atoms of a water molecule are held together
by ________ bonds.
Ans: covalent
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What is the pH of a solution with a hydroxyl ion (OH-) concentration of
10^(-10) M?
Ans: pH 4
A solution contains 0.0001 moles of hydrogen ions [H+] per liter. Which
of the following best describes this solution?
Ans: the solution is acidic because it contains a H+ donor
What is the concentration of hydroxide ions [OH-] in a solution of pH 5?
Ans: 10^(-9) M
Consider two solutions: solution X has a pH of 4; solution Y has a pH of
7. From this information, we can reasonably conclude that ________.
Ans: the concentration of hydrogen ions in solution X is 1000
times as great as the concentration of hydrogen ions in solution
Y
If you were a spider gliding across a pond in the summer in Virginia, for
what property of water would you be most grateful?
Ans: cohesion
All rights reserved © 2025/ 2026 |
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As water freezes, ________.
Ans: its molecules move farther apart
Why do hydrophilic molecules dissolve easily in water?
Ans: Their polar groups form hydrogen bonds with water.
How many electrons must one carbon atom share with other atom or
atoms to complete its valence shell?
Ans: four
What characteristic is responsible for the complexity and variety of
organic molecules?
Ans: the chemical versatility of carbon atoms
What factor determines whether a carbon atom's covalent bonds with
other atoms are in a tetrahedral configuration or a planar
configuration?
Ans: double bonds between the carbon atom and other atoms
The maximum number of hydrogen atoms in a non-cyclic hydrocarbon
with five carbons is ________.
All rights reserved © 2025/ 2026 |
BSC2010 Final Exam Questions Review
Marie Dennis Questions and Correct
Answers/ Latest Update / Already Graded
An ion that consists of 7 protons, 6 neutrons, and 11 electrons has a net
charge of ________.
Ans: 4-
What has the smallest total mass?
Ans: two electrons
What is true of an atom of Carbon that has 6 protons, 6 neutrons, and 6
electrons?
Ans: It has an atomic number of 6.
How is a covalent bond formed?
Ans: two atoms share two electrons [one each]
What atomic structure is shown in blue?
Ans: Electron
All rights reserved © 2025/ 2026 |
, Page |2
In polar covalent bonds, an atom can have a partial positive charge
when it:
Ans: shares an electron with a more electronegative atom
What element does not react with other elements? [hint: atoms of this
element have already a complete valence shell]
Ans: helium
The fact that oxygen is an atom that is strongly electronegative means
that __________.
Ans: it more strongly pulls shared electrons toward itself when
forming a covalent bond with a less electronegative a tom
Adjacent water molecules interact through the ________.
Ans: electrical attraction between the hydrogen of one water
molecule and the oxygen of another water molecule
The hydrogen and oxygen atoms of a water molecule are held together
by ________ bonds.
Ans: covalent
All rights reserved © 2025/ 2026 |
, Page |3
What is the pH of a solution with a hydroxyl ion (OH-) concentration of
10^(-10) M?
Ans: pH 4
A solution contains 0.0001 moles of hydrogen ions [H+] per liter. Which
of the following best describes this solution?
Ans: the solution is acidic because it contains a H+ donor
What is the concentration of hydroxide ions [OH-] in a solution of pH 5?
Ans: 10^(-9) M
Consider two solutions: solution X has a pH of 4; solution Y has a pH of
7. From this information, we can reasonably conclude that ________.
Ans: the concentration of hydrogen ions in solution X is 1000
times as great as the concentration of hydrogen ions in solution
Y
If you were a spider gliding across a pond in the summer in Virginia, for
what property of water would you be most grateful?
Ans: cohesion
All rights reserved © 2025/ 2026 |
, Page |4
As water freezes, ________.
Ans: its molecules move farther apart
Why do hydrophilic molecules dissolve easily in water?
Ans: Their polar groups form hydrogen bonds with water.
How many electrons must one carbon atom share with other atom or
atoms to complete its valence shell?
Ans: four
What characteristic is responsible for the complexity and variety of
organic molecules?
Ans: the chemical versatility of carbon atoms
What factor determines whether a carbon atom's covalent bonds with
other atoms are in a tetrahedral configuration or a planar
configuration?
Ans: double bonds between the carbon atom and other atoms
The maximum number of hydrogen atoms in a non-cyclic hydrocarbon
with five carbons is ________.
All rights reserved © 2025/ 2026 |
