BSC 2010 Final Exam Review Questions and answers. Verified/| LATEST EXAM UPDATES|

BSC 2010 Final Exam Review Questions and answers. Verified/ How many electrons participate in a triple covalent bond? - -6 How many electrons will a single atom of nitrogen with no charge and no bonds have in its valence shell? - -5 Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92- 100. Based on this information, which of the following is also true of molybdenum? - -Molybdenum atoms can have between 50 and 58 neutrons Which of the following has the smallest total mass? - -two electrons Adjacent water molecules interact through the ________ - -electrical attraction between the hydrogen of one water molecule and the oxygen of another water molecule How is a covalent bond formed? - -two atoms share two electrons An atom has a partial positive charge when it: - -shares an electron with a more electronegative atom What element does not react with other elements? - -helium The hydrogen and oxygen atoms of a water molecule are held together by ________ bonds - - covalent Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? - -10-4M A solution of pH 9 is ________ than a solution of pH 8 - -10 times less acidic What is the concentration of hydroxide ions in a solution of pH 5? - -10-9 M Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that ________ - -the concentration of hydrogen ions in solution X is 1000 times as great as the concentration of hydrogen ions in solution Y What kind of bonds are responsible for the unique cohesion, surface tension, and adhesion properties of water molecules? - -hydrogen bonding As water freezes, ________ - -its molecules move farther apart Hydrophobic substances such as vegetable oil are ________ - -nonpolar substances that repel water molecules [i.e. do not establish bonds] Which of the following is true of carbon? - -It can form both