BIOLOGY 93 UCI MIDTERM 1 KEY TERMS 100% CORRECT

BIOLOGY 93 UCI MIDTERM 1 KEY TERMS 100% CORRECT Hypothesis a tentative answer to a well framed question - an explanation on trial Prediction A logical statement about what will happen if the hypothesis is correct. Experiment a repeatable procedure that is used to test a hypothesis (a scientific test carried under controlled condition) Variable factors that vary in an experiment Controlled Experiment An experiment in which all factors are identical except the one being tested. Compares an experimental group with a control group Independent Variable the factor manipulated by the researchers Dependent Variable a factor that is measured in the experiment Theory 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 an approach to understanding the natural world Element is a chemical substance that cannot be broken down to other substances Compound a substance consisting of 2 or more different elements combined in a fixed ratio. Neutron a atomic particle that is electrically neutral (0) Proton a atomic particle with one unit of positive charge Electron a atomic particle with one unit of negative charge Atom 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 is the sharing of a pair of valence electrons by two atoms. Molecule two or more atoms held together by covalent bonds constitute a molecule Single bond a covalent bond in which two atoms share one pair of electrons Double Bond a covalent bond produced by the sharing of two pairs of electrons between two atoms Valence Electrons on the outermost energy level of an atom: electrons that form bonds. Electronegativity Atom's ability to attract and hold electrons. Non polar Covalent Bond a bond where electrons are shared equally among two atoms or where symmetric structure causes polarity to cancel out. Polar Covalent Bond Where asymmetric structure and unequal sharing of electrons between two atoms with different electronegativity values create partial charges within the molecule.