AP Biology Unit 1&2; Questions & Answers Latest
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Unit one: The Chemistry of Life
Chapter 2: The Chemical Context of life
Matter Correct answer-Anything that takes up space and has mass.
Element Correct answer-Substance that cannot be broken down to other substances
through chemical reactions. Each has a symbol. 92 occurring in nature.
Compound Correct answer-Substance consisting of two or more different elements
combined in a fixed ratio.
*Characteristics different than those of its elements
CHON Correct answer-4 elements essential to life
Trace Elements Correct answer-Required by an organism only in minute quantities.
Atom Correct answer-Smallest unit of matter that retains the properties of an element.
Composed of subatomic particles. Mostly empty space.
Subatomic particles Correct answer-Neutrons, protons, electrons. Make up atoms.
, AP Biology Unit 1&2; Questions & Answers Latest
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Proton Correct answer-One unit of positive charge. Approximately one dalton. Located in
nucleus.
Electron Correct answer-One unit of negative charge. Located outside of nucleus.
Atomic Nucleus Correct answer-Dense core packed with protons and neutrons.
Neutrons Correct answer-Electrically neutral. Approximately one dalton.
Atomic Number Correct answer-The number of protons (which is unique to that element)
and written as a subscript to left of element symbol. Also tells us number of electrons since P=E
if atom is neutral
Mass Number Correct answer-Sum of the protons and the neutrons. An approximation of
the atomic mass.
Isotopes Correct answer-Same number of protons, but different number of neutrons and
therefore different mass. Same element.
Radioactive Isotope Correct answer-One in which the nucleus decays spontaneously,
giving off particles and energy. Can decay to a different element. Have useful applications.
, AP Biology Unit 1&2; Questions & Answers Latest
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Energy Correct answer-Capacity to cause change
Potential Energy Correct answer-Energy matter possesses because of its location or
structure. Electrons have this based on distance from nucleus.
Electron Shells Correct answer-Where electrons are found, each with characteristic
average distance and energy level. Electrons can change these by absorbing or losing energy.
Valence Electrons Correct answer-Electrons in the outermost shell.
Chemical Bonds Correct answer-The attraction that holds atoms together during an
interaction.
Covalent Bond Correct answer-Sharing of a pair of valence electrons by two atoms.
Molecule Correct answer-Two or more atoms held together by covalent bonds.
Single Bond Correct answer-One pair of shared electrons.
Structural Formula Correct answer-H--H. Notation which represents both atoms and
bonding.
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Unit one: The Chemistry of Life
Chapter 2: The Chemical Context of life
Matter Correct answer-Anything that takes up space and has mass.
Element Correct answer-Substance that cannot be broken down to other substances
through chemical reactions. Each has a symbol. 92 occurring in nature.
Compound Correct answer-Substance consisting of two or more different elements
combined in a fixed ratio.
*Characteristics different than those of its elements
CHON Correct answer-4 elements essential to life
Trace Elements Correct answer-Required by an organism only in minute quantities.
Atom Correct answer-Smallest unit of matter that retains the properties of an element.
Composed of subatomic particles. Mostly empty space.
Subatomic particles Correct answer-Neutrons, protons, electrons. Make up atoms.
, AP Biology Unit 1&2; Questions & Answers Latest
Update 100% Solved
Proton Correct answer-One unit of positive charge. Approximately one dalton. Located in
nucleus.
Electron Correct answer-One unit of negative charge. Located outside of nucleus.
Atomic Nucleus Correct answer-Dense core packed with protons and neutrons.
Neutrons Correct answer-Electrically neutral. Approximately one dalton.
Atomic Number Correct answer-The number of protons (which is unique to that element)
and written as a subscript to left of element symbol. Also tells us number of electrons since P=E
if atom is neutral
Mass Number Correct answer-Sum of the protons and the neutrons. An approximation of
the atomic mass.
Isotopes Correct answer-Same number of protons, but different number of neutrons and
therefore different mass. Same element.
Radioactive Isotope Correct answer-One in which the nucleus decays spontaneously,
giving off particles and energy. Can decay to a different element. Have useful applications.
, AP Biology Unit 1&2; Questions & Answers Latest
Update 100% Solved
Energy Correct answer-Capacity to cause change
Potential Energy Correct answer-Energy matter possesses because of its location or
structure. Electrons have this based on distance from nucleus.
Electron Shells Correct answer-Where electrons are found, each with characteristic
average distance and energy level. Electrons can change these by absorbing or losing energy.
Valence Electrons Correct answer-Electrons in the outermost shell.
Chemical Bonds Correct answer-The attraction that holds atoms together during an
interaction.
Covalent Bond Correct answer-Sharing of a pair of valence electrons by two atoms.
Molecule Correct answer-Two or more atoms held together by covalent bonds.
Single Bond Correct answer-One pair of shared electrons.
Structural Formula Correct answer-H--H. Notation which represents both atoms and
bonding.
