BIOLOGY 93 UCI MIDTERM 1 Questions With Answers | UPDATED

BIOLOGY 93 UCI MIDTERM 1 Questions With Answers | UPDATED 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 Product - ANSWER Element or compound produced by a chemical reaction Chemical Equilibrium - ANSWER the point in a reactions where the rate of the forwards reaction = the rate of the reverse reactions = no net production of products or reactants Solution - AN