BIO EXAM QUESTIONS WITH ANSWERS 2022 /2023
UPDATE GRADED A+
CHAPTER 1
The left to right order of elements in the periodic table is based on their .
A. atomic mass
B. the number of neutrons
C. atomic number
D. electric charge of the atom
Atoms have no electric charge because they have .
A. uncharged neutrons in their nuclei
B. an equal number of protons and neutrons
C. an equal number of charged and uncharged subatomic particles
D. an equal number of protons and electrons
Oxygen has an atomic number of 8 and, most commonly, a mass number of 16. Thus, what is the atomic mass
of an oxygen atom?
A. approximately 16 grams
B. approximately 16 daltons
C. approximately 8 daltons
D. approximately 8 grams
A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have
the greatest difficulty clinging to a .
A. slightly damp surface
B. surface of hydrocarbons
C. surface of mostly carbon-nitrogen bonds
D. surface of mostly carbon-oxygen bonds
Which one of the atoms shown would be most likely to form an anion with a charge of -1?
A. B.
C. D.
6. Bonds between two atoms that are equally electronegative are .
A. nonpolar covalent bonds
B. polar covalent bonds
C. hydrogen bonds
D. ionic bonds
The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for
magnesium chloride?
A. MgCl
B. MgCl3
C. MgCl2
D. Mg2Cl
How many electron pairs are shared between the carbon atoms in a molecule that has the formula C2H4?
,BIO EXAM QUESTIONS WITH ANSWERS 2022 /2023
UPDATE GRADED A+
C. Four
D. Three
E. One
D. Two
Van der Waals interactions may result when .
A. electrons are not symmetrically distributed in a molecule
B. two polar covalent bonds react
C. molecules held by ionic bonds react with water
D. a hydrogen atom loses an electron
What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two
carbon atoms?
A. Four
B. Two
C. Eight
D. Six
Refer to the following figure to answer the questions below.
What is the atomic number of the cation formed in the reaction in the illustration?
A. 8
B. 10
C. 16
D. 11
Refer to the following figure to answer the questions below.
3H2 + N2 ⇌ 2NH3
Which of the following factors will increase the rate of reaction in the forward direction?
A. addition of both nitrogen and hydrogen
B. addition of ammonia
C. addition of nitrogen
D. addition of hydrogen
Which of the following correctly describes chemical equilibrium?
A. Forward and reverse reactions continue with no net effect on the concentrations of the reactants and
products.
B. There are equal concentrations of reactants and products, and the reactions have stopped.
C. There are equal concentrations of products and reactants while forward and reverse reactions continue.
D. Concentrations of products are higher than the concentrations of the reactants.
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the
atomic nucleus of nitrogen-15 contains .
A. 8 neutrons
B. 8 protons
C. 15 protons
D. 7 neutrons
A neutral atom has two, eight, and eight electrons in its first, second, and third energy levels. This information
, BIO EXAM QUESTIONS WITH ANSWERS 2022 /2023
UPDATE GRADED A+
.
A. does not tell us about the chemical properties of the element
B. does not tell us about the atomic mass of the element
C. does not tell us about the atomic number of the element
D. does not tell us about the size of the element
Why are hydrocarbons insoluble in water?
A. The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
B. They are less dense than water.
C. The majority of their bonds are polar covalent carbon-to-hydrogen linkages.
D. They exhibit considerable molecular complexity and diversity.
Use the following figure to answer the question.
The figure shows the structures of glucose and fructose. These two molecules are .
A. isotopes
B. cis-trans isomers
C. structural isomers
D. enantiomers
What is the difference between covalent bonds and ionic bonds?
A. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical
attraction between charged atoms.
B. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of
protons between charged atoms.
C. Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing
of single electrons between atoms.
D. Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing
of electrons between atoms.
The partial negative charge in a molecule of water occurs because .
A. the oxygen atom donates an electron to each of the hydrogen atoms
B. the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen
atoms C. the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen
atom
nucleus than around the hydrogen atom nucleus
D. one of the hydrogen atoms donates an electron to the oxygen atom
Which of the following statements is true about buffer solutions?
UPDATE GRADED A+
CHAPTER 1
The left to right order of elements in the periodic table is based on their .
A. atomic mass
B. the number of neutrons
C. atomic number
D. electric charge of the atom
Atoms have no electric charge because they have .
A. uncharged neutrons in their nuclei
B. an equal number of protons and neutrons
C. an equal number of charged and uncharged subatomic particles
D. an equal number of protons and electrons
Oxygen has an atomic number of 8 and, most commonly, a mass number of 16. Thus, what is the atomic mass
of an oxygen atom?
A. approximately 16 grams
B. approximately 16 daltons
C. approximately 8 daltons
D. approximately 8 grams
A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have
the greatest difficulty clinging to a .
A. slightly damp surface
B. surface of hydrocarbons
C. surface of mostly carbon-nitrogen bonds
D. surface of mostly carbon-oxygen bonds
Which one of the atoms shown would be most likely to form an anion with a charge of -1?
A. B.
C. D.
6. Bonds between two atoms that are equally electronegative are .
A. nonpolar covalent bonds
B. polar covalent bonds
C. hydrogen bonds
D. ionic bonds
The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for
magnesium chloride?
A. MgCl
B. MgCl3
C. MgCl2
D. Mg2Cl
How many electron pairs are shared between the carbon atoms in a molecule that has the formula C2H4?
,BIO EXAM QUESTIONS WITH ANSWERS 2022 /2023
UPDATE GRADED A+
C. Four
D. Three
E. One
D. Two
Van der Waals interactions may result when .
A. electrons are not symmetrically distributed in a molecule
B. two polar covalent bonds react
C. molecules held by ionic bonds react with water
D. a hydrogen atom loses an electron
What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two
carbon atoms?
A. Four
B. Two
C. Eight
D. Six
Refer to the following figure to answer the questions below.
What is the atomic number of the cation formed in the reaction in the illustration?
A. 8
B. 10
C. 16
D. 11
Refer to the following figure to answer the questions below.
3H2 + N2 ⇌ 2NH3
Which of the following factors will increase the rate of reaction in the forward direction?
A. addition of both nitrogen and hydrogen
B. addition of ammonia
C. addition of nitrogen
D. addition of hydrogen
Which of the following correctly describes chemical equilibrium?
A. Forward and reverse reactions continue with no net effect on the concentrations of the reactants and
products.
B. There are equal concentrations of reactants and products, and the reactions have stopped.
C. There are equal concentrations of products and reactants while forward and reverse reactions continue.
D. Concentrations of products are higher than the concentrations of the reactants.
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the
atomic nucleus of nitrogen-15 contains .
A. 8 neutrons
B. 8 protons
C. 15 protons
D. 7 neutrons
A neutral atom has two, eight, and eight electrons in its first, second, and third energy levels. This information
, BIO EXAM QUESTIONS WITH ANSWERS 2022 /2023
UPDATE GRADED A+
.
A. does not tell us about the chemical properties of the element
B. does not tell us about the atomic mass of the element
C. does not tell us about the atomic number of the element
D. does not tell us about the size of the element
Why are hydrocarbons insoluble in water?
A. The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
B. They are less dense than water.
C. The majority of their bonds are polar covalent carbon-to-hydrogen linkages.
D. They exhibit considerable molecular complexity and diversity.
Use the following figure to answer the question.
The figure shows the structures of glucose and fructose. These two molecules are .
A. isotopes
B. cis-trans isomers
C. structural isomers
D. enantiomers
What is the difference between covalent bonds and ionic bonds?
A. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical
attraction between charged atoms.
B. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of
protons between charged atoms.
C. Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing
of single electrons between atoms.
D. Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing
of electrons between atoms.
The partial negative charge in a molecule of water occurs because .
A. the oxygen atom donates an electron to each of the hydrogen atoms
B. the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen
atoms C. the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen
atom
nucleus than around the hydrogen atom nucleus
D. one of the hydrogen atoms donates an electron to the oxygen atom
Which of the following statements is true about buffer solutions?
