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BIOLOGY 93 UCI MIDTERM 1 KEY TERMS EXAM
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BIOLOGY 93 UCI MIDTERM 1 KEY TERMS EXAM...
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Hypothesis - ANSWER a tentative answer to a well-framed question - anexplanation on trial
Prediction - ANSWER A logical statement about what will happen if the
hypothesis is correct.
Experiment - ANSWER a repeatable procedure that is used to test a hypothesis
- a scientific test carried under controlled condition
Variable - ANSWER factors that vary in an experiment
Controlled Experiment - ANSWER An experiment in which all factors are
identical except the one being tested. Compares an experimental group with a
control group
Independent Variable - ANSWER the factor manipulated by the researchers
Dependent Variable - ANSWER a factor that is measured in the experiment
Theory - ANSWER 1)Broader than a hypothesis. 2)broad enough to spin off
many new hypotheses that can be tested. 3) Supported by a great body of
evidence
,Science - ANSWER an approach to understanding the natural world
Element - ANSWER is a chemical substance that cannot be broken down to
other substances
Compound - ANSWER a substance that consists of 2 or more different elements
combined in a fixed ratio.
Neutron - ANSWER an atomic particle that is electrically neutral (0)
Proton - ANSWER an atomic particle with one unit of positive charge
Electron - ANSWER an atomic particle with one unit of negative charge
Atom - ANSWER smallest unit of matter that still retains the properties of an
element. Comprise of a neutron/proton nucleus, and shell(s) of electrons
Covalent Bond - ANSWER is the sharing of a pair of valence electrons by two
atoms.
Molecule - ANSWER two or more atoms held together by covalent bonds
constitute a molecule
Single bond - ANSWER a covalent bond in which two atoms share one pair of
electrons
, Double Bond - ANSWER a covalent bond produced by the sharing of two pairs
of electrons between two atoms
Valence - ANSWER Electrons on the outermost energy level of an atom:
electrons that form bonds.
Electronegativity - ANSWER Atom's ability to attract and hold electrons.
Non polar Covalent Bond - ANSWER a bond where electrons are shared
equally among two atoms or where symmetric structure causes polarity to
cancel out.
Polar Covalent Bond - ANSWER Where asymmetric structure and unequal
sharing of electrons between two atoms of different electronegativity values
creates partial charges within the molecule.
Ionic Bond - ANSWER When an electron is attracted to another atom of higher
electronegativity and the resulting charges create a ionic attraction.
Ion - ANSWER A charged atom or group of atoms that is charged due to a net
loss or gain of electrons
Cation - ANSWER a positively charged ion
Anion - ANSWER a negatively charged ion
Salt - ANSWER The product of ionic bond formation; also an ionic compound
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