CAMPBELL BIOLOGY CHAPTERS 2
EXAM Q’S AND A’S
matter - ANSWER-anything that has mass and takes up space
element - ANSWER-any substance that cannot be broken down into simpler
substances by chemical reactions. (92 elements are recognized, 25 are essentil for
life)
compound - ANSWER-consisting of two or more substances or ingredients or
elements or parts combined in a fixed ratio.
trace elements - ANSWER-Elements required by an organism in only minute
quantities
atom - ANSWER-the smallest component of an element having the chemical
properties of the element
neutrons - ANSWER-the particles of the nucleus that have no charge
protons - ANSWER-positively charged particles
electrons - ANSWER-negatively charged subatomic particles
atomic nucleus - ANSWER-An atom's central core, containing protons and neutrons.
atomic number - ANSWER-the number of protons in the nucleus of an atom, written
as a subscript to the left of the symbol.
mass number - ANSWER-the sum of the number of neutrons and protons in an
atomic nucleus
atomic mass - ANSWER-total mass of the protons and neutrons in an atom,
measured in atomic mass units
isotopes - ANSWER-atoms with the same number of protons but different number of
neutrons
radioactive isotope - ANSWER-isotope in which the nucleus decays (breaks down)
over time, giving off radiation in the form of matter and energy
Energy - ANSWER-the capacity of a physical system to do work
potential energy - ANSWER-energy stored due to an object's position or
arrangement
EXAM Q’S AND A’S
matter - ANSWER-anything that has mass and takes up space
element - ANSWER-any substance that cannot be broken down into simpler
substances by chemical reactions. (92 elements are recognized, 25 are essentil for
life)
compound - ANSWER-consisting of two or more substances or ingredients or
elements or parts combined in a fixed ratio.
trace elements - ANSWER-Elements required by an organism in only minute
quantities
atom - ANSWER-the smallest component of an element having the chemical
properties of the element
neutrons - ANSWER-the particles of the nucleus that have no charge
protons - ANSWER-positively charged particles
electrons - ANSWER-negatively charged subatomic particles
atomic nucleus - ANSWER-An atom's central core, containing protons and neutrons.
atomic number - ANSWER-the number of protons in the nucleus of an atom, written
as a subscript to the left of the symbol.
mass number - ANSWER-the sum of the number of neutrons and protons in an
atomic nucleus
atomic mass - ANSWER-total mass of the protons and neutrons in an atom,
measured in atomic mass units
isotopes - ANSWER-atoms with the same number of protons but different number of
neutrons
radioactive isotope - ANSWER-isotope in which the nucleus decays (breaks down)
over time, giving off radiation in the form of matter and energy
Energy - ANSWER-the capacity of a physical system to do work
potential energy - ANSWER-energy stored due to an object's position or
arrangement
