Biology 121 JCCC Exam 1 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
False statement about matter - CORRECT ANSWER - All mattere exists in the form of
compounds
Describe a compound - CORRECT ANSWER - Contains two or more different elements in a
fixed ratio
In the equation 2 H2 + O2 2 H2O - CORRECT ANSWER - only H2O is a compound
False statement regarding chemical reactions - CORRECT ANSWER - Some chemical
reactions create electrons; others destroy them
In the equation 2 H2 + O2 2 H2O, the H2 molecules are ________ and the H2O molecules are
________. - CORRECT ANSWER - reactants . . . products
Which particles are found in the nucleus of an atom? - CORRECT ANSWER - protons and
neutrons
What is the atomic weight (mass) of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
CORRECT ANSWER - About 12
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
electrons does boron have? - CORRECT ANSWER - 5
Describe the atomic number of an atom - CORRECT ANSWER - the number of protons in
the atom
, Chemical bonds result when two or more atoms share or donate: - CORRECT ANSWER -
Electrons
Table salt is formed when: - CORRECT ANSWER - sodium donates its single outer electron
to chlorine.
What is the fundamental difference between covalent and ionic bonding? - CORRECT
ANSWER - In a covalent bond, the partners share a pair of electrons; in an ionic bond, one
partner accepts electrons from the other.
In a water molecule, hydrogen and oxygen are held together by a(n) ________ bond. -
CORRECT ANSWER - polar bond (polar covalent bond)
The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds,
whereas neighboring water molecules are held together by ________ bonds. - CORRECT
ANSWER - polar covalent . . . hydrogen
Water molecules stick to other water molecules because - CORRECT ANSWER - hydrogen
bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other
water molecules.
Photosynthesis requires many steps to make glucose but can be summarized as: 6CO2+
6H2O→C6H12O6 + 6O2
As a result of the synthesis process: - CORRECT ANSWER - all the carbons from the six
carbon dioxide atoms are found in glucose.
The tendency of water molecules to stick together is referred to as - CORRECT ANSWER -
Cohesion
Water's surface tension and heat storage capacity is accounted for by its - CORRECT
ANSWER - Hydrogen bonds
ACTUAL Exam Questions and CORRECT
Answers
False statement about matter - CORRECT ANSWER - All mattere exists in the form of
compounds
Describe a compound - CORRECT ANSWER - Contains two or more different elements in a
fixed ratio
In the equation 2 H2 + O2 2 H2O - CORRECT ANSWER - only H2O is a compound
False statement regarding chemical reactions - CORRECT ANSWER - Some chemical
reactions create electrons; others destroy them
In the equation 2 H2 + O2 2 H2O, the H2 molecules are ________ and the H2O molecules are
________. - CORRECT ANSWER - reactants . . . products
Which particles are found in the nucleus of an atom? - CORRECT ANSWER - protons and
neutrons
What is the atomic weight (mass) of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
CORRECT ANSWER - About 12
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
electrons does boron have? - CORRECT ANSWER - 5
Describe the atomic number of an atom - CORRECT ANSWER - the number of protons in
the atom
, Chemical bonds result when two or more atoms share or donate: - CORRECT ANSWER -
Electrons
Table salt is formed when: - CORRECT ANSWER - sodium donates its single outer electron
to chlorine.
What is the fundamental difference between covalent and ionic bonding? - CORRECT
ANSWER - In a covalent bond, the partners share a pair of electrons; in an ionic bond, one
partner accepts electrons from the other.
In a water molecule, hydrogen and oxygen are held together by a(n) ________ bond. -
CORRECT ANSWER - polar bond (polar covalent bond)
The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds,
whereas neighboring water molecules are held together by ________ bonds. - CORRECT
ANSWER - polar covalent . . . hydrogen
Water molecules stick to other water molecules because - CORRECT ANSWER - hydrogen
bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other
water molecules.
Photosynthesis requires many steps to make glucose but can be summarized as: 6CO2+
6H2O→C6H12O6 + 6O2
As a result of the synthesis process: - CORRECT ANSWER - all the carbons from the six
carbon dioxide atoms are found in glucose.
The tendency of water molecules to stick together is referred to as - CORRECT ANSWER -
Cohesion
Water's surface tension and heat storage capacity is accounted for by its - CORRECT
ANSWER - Hydrogen bonds
