BIO 198 Exam 1 Test Questions and Correct Answers

The atomic number refers to the amount of ______ in an atom. protons Atoms in which the number of electrons does not equal the number of protons are known as _________ ions a _______ bond is formed when 2 atoms share one or more pairs of valence electrons. covalent Chemical bonds that form due to the attraction between oppositely charged atoms that have gained or lost electrons are called _________. ionic bonds A catalyst is a substance that _________ the rate of a reaction without being altered itself. speeds up Because water molecules attract each other, water is said to be ________. cohesive The attraction of water to other polar substances is called _________. adhesion Water consists of one oxygen atom joined to two hydrogen atoms by what type of bonds? covalent Water is cohesive because water molecules are __________. attracted to each other An acidic pH range is _____________. values below 7 Buffers stabilize pH by absorbing and releasing _________. hydrogen ions An alkaline (basic) pH range is _________. values above 7 When a base is added, buffers _________ hydrogen ions to stabilize pH. release When an acid is added, buffers _________ hydrogen ions to stabilize pH. absorb