BIO 151 Final Exam with questions and
verified 100% answers
A hypothesis is - Answer;a proposed explanation for a set of observations
A theory is - Answer;an explanation of an idea that is broad in scope and supported by
a large body of evidence
The role of a control in an experiment is to - Answer;provide a basis of comparison to
the experimental group
The basic structural and physiological unit of all living organisms is the - Answer;cell
The process by which organisms maintain a stable internal environment in the face of a
fluctuating external environment is called - Answer;homeostasis
The four most common elements in living organisms are - Answer;C, H, O, N
What is false regarding matter? - Answer;all matter is composed of elements
Which of the following particles is found in the nucleus of an atom? - Answer;protons
and neutrons
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
Answer;12
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many electrons does boron have? - Answer;5
What best describes the atomic number of an atom? - Answer;the number of protons in
the atom
What represents an ion? - Answer;Ca2+
Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope
of nitrogen could - Answer;have more neutrons than the usual nitrogen atom
What happens to an atom if the electrons in the outer shell are altered? - Answer;the
properties of the atom will change
What forms when two atoms share electrons? - Answer;covalent bond
, Table salt is formed when (sodium has atomic number of 11 and chlorine has an atomic
number or 17) - Answer;sodium donates its outer electron to chlorine
In a water molecule, hydrogen and oxygen are held together by a(n) - Answer;polar
covalent bond
Weak bonds that are not strong enough to hold atoms together to form molecules but
are strong enough to form bonds within and around large molecules are called -
Answer;hydrogen bonds
What is the correct order (in decreasing order) for the relative strengths of chemical
bonds? - Answer;covalent, ionic, hydrogen, van der Waals forces
What determines if a molecule is polar, non polar, or ionic? - Answer;the differences in
electronegativity of the atoms
Which of the following statements regarding chemical reactions is false? - Answer;some
chemical reactions create electrons; others destroy them
The tendency of water molecules to stick together is referred to as - Answer;cohesion
Two characteristics of water make it different from most other compounds: Its solid state
is ______ its liquid state and its ______ nature allows it to make a great solvent for salts
and other compounds - Answer;less dense than; polar
Sweating is a useful cooling device for humans because water - Answer;takes up a
great deal of heat in changing from its liquid state to its gaseous state
Surface tension and capillary action occur in water because it - Answer;has hydrogen
bonds
Which of the following statements about pH is true? - Answer;an increase in hydrogen
ion concentration means a decrease in pH scale units
The notation [H+] refers to the - Answer;concentration of H+ ions
If one were to add a strong acid like HCl to an aqueous solution, which would result? -
Answer;both H+ would be released into solution and the pH would decrease
An element has a weight of 131.3. The reason the number is not a whole number is that
- Answer;atomic weight is the average of the mass numbers of all the element's
isotopes
Which contains more molecules, a mole of hydrogen or a mole of carbon? -
Answer;both contain the same number of molecules
verified 100% answers
A hypothesis is - Answer;a proposed explanation for a set of observations
A theory is - Answer;an explanation of an idea that is broad in scope and supported by
a large body of evidence
The role of a control in an experiment is to - Answer;provide a basis of comparison to
the experimental group
The basic structural and physiological unit of all living organisms is the - Answer;cell
The process by which organisms maintain a stable internal environment in the face of a
fluctuating external environment is called - Answer;homeostasis
The four most common elements in living organisms are - Answer;C, H, O, N
What is false regarding matter? - Answer;all matter is composed of elements
Which of the following particles is found in the nucleus of an atom? - Answer;protons
and neutrons
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
Answer;12
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many electrons does boron have? - Answer;5
What best describes the atomic number of an atom? - Answer;the number of protons in
the atom
What represents an ion? - Answer;Ca2+
Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope
of nitrogen could - Answer;have more neutrons than the usual nitrogen atom
What happens to an atom if the electrons in the outer shell are altered? - Answer;the
properties of the atom will change
What forms when two atoms share electrons? - Answer;covalent bond
, Table salt is formed when (sodium has atomic number of 11 and chlorine has an atomic
number or 17) - Answer;sodium donates its outer electron to chlorine
In a water molecule, hydrogen and oxygen are held together by a(n) - Answer;polar
covalent bond
Weak bonds that are not strong enough to hold atoms together to form molecules but
are strong enough to form bonds within and around large molecules are called -
Answer;hydrogen bonds
What is the correct order (in decreasing order) for the relative strengths of chemical
bonds? - Answer;covalent, ionic, hydrogen, van der Waals forces
What determines if a molecule is polar, non polar, or ionic? - Answer;the differences in
electronegativity of the atoms
Which of the following statements regarding chemical reactions is false? - Answer;some
chemical reactions create electrons; others destroy them
The tendency of water molecules to stick together is referred to as - Answer;cohesion
Two characteristics of water make it different from most other compounds: Its solid state
is ______ its liquid state and its ______ nature allows it to make a great solvent for salts
and other compounds - Answer;less dense than; polar
Sweating is a useful cooling device for humans because water - Answer;takes up a
great deal of heat in changing from its liquid state to its gaseous state
Surface tension and capillary action occur in water because it - Answer;has hydrogen
bonds
Which of the following statements about pH is true? - Answer;an increase in hydrogen
ion concentration means a decrease in pH scale units
The notation [H+] refers to the - Answer;concentration of H+ ions
If one were to add a strong acid like HCl to an aqueous solution, which would result? -
Answer;both H+ would be released into solution and the pH would decrease
An element has a weight of 131.3. The reason the number is not a whole number is that
- Answer;atomic weight is the average of the mass numbers of all the element's
isotopes
Which contains more molecules, a mole of hydrogen or a mole of carbon? -
Answer;both contain the same number of molecules
