BIOLOGY 93 UCI MIDTERM 1 KEY TERMS Exam Questions With Complete Solutions
Hypothesis - Answer-a tentative answer to a well framed question - an explanation on trial
/.Prediction - Answer-A logical statement about what will happen if the hypothesis is correct.
/.Experiment - Answer-a repeat...
Hypothesis - Answer-a tentative answer to a well framed question - an explanation 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 consisting of 2 or more different elements combined
in a fixed ratio.
/.Neutron - Answer-a atomic particle that is electrically neutral (0)
/.Proton - Answer-a atomic particle with one unit of positive charge
/.Electron - Answer-a atomic particle with one unit of negative charge
/.Atom - Answer-smallest unit of matter that still retains the properties of an element.
Made up 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 with different electronegativity values create 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-A compound resulting from the formation of ionic bonds; also called an
ionic compound
/.Hydrogen Bond - Answer-a weak interaction involving a hydrogen atom and a fluorine,
oxygen, or nitrogen atom
/.Van De Waals Interaction - Answer-Weak attractions between molecules due to
opposite polarized electron clouds
/.Chemical Reaction - Answer-the making and breaking of chemical bonds, leading to
changes in the composition of matter
/.Reactant - Answer-A chemical substance that is present at the start of a chemical
reaction
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