Science Bowl Chemistry Questions With Verified And Updated Answers

Science Bowl Chemistry Questions With Verified And Updated Answers The ideal fuel for fuel cell use is: A. compressed natural gas B. reformulated gasoline C. hydrogen D. methanol - answerAnswer: HYDROGEN Out of the following choices, which is the correct name for N2O3: A. dinitrogen oxide B. dinitrogen dioxide C. dinitrogen trioxide D. dinitrogen tetroxide - answerAnswer: DINITROGEN TRIOXIDE Which of the following is an example of a buffer system: A. H2CO3 and water B. H2CO3 and NaHCO3 C. NH3 and N2 D. NaCl and KCl - answerAnswer: H2CO3 AND NaHCO3 Which of the following is the best example of a polysaccharide: A. glucose B. galactose C. sucrose D. cellulose - answerAnswer: CELLULOSE Which of the following dominates the gasses in the Earth's atmosphere, making up some 78% of the air by volume: A. nitrogen B. oxygen C. helium D. hydrogen - answerAnswer: NITROGEN Which of the following is an organic molecule: A. CaSO4 B. CH4 C. NH3 D. H2O - answerAnswer: CH4 Which one of the following has the greatest tendency to lose an electron? A. Zn B. Cl- C. Br2 D. A mixture of PbSO4 and H2O - answerAnswer: Zn Which of the following is NOT a final product of the overall cell reaction in a hydrogen fuel cell: A. heat B. electric power C. carbon dioxide D. water - answerAnswer: CARBON DIOXIDE The use of electricity to decompose molten sodium chloride into its component elements is an example of: A. electrolysis B. galvanization C. a voltaic cell D. electroplating - answerAnswer: ELECTROLYSIS Which of the following metals react violently with water to produce hydrogen gas: A. sodium B. zinc C. platinum D. silver - answerAnswer: SODIUM The wavelength of yellow light is 600 nanometers. What is the wavelength in centimeters: A. 6.0 x 10-9 B. 6.0 x 10-7 C. 6.0 x 10-5 D. 6.0 x 10-2 - answerAnswer: C Another name for heavy water is: A. ice B. salt water C. deuterium D. deuterium oxide - answerAnswer: D The Tyndall Effect can be demonstrated when light is passed through which of the following: A. a colloidal suspension B. supercritical water C. aqueous solutions D. mixtures of gasses - answerAnswer: A Which of the following is true about the Kinetic Theory of Gases: A. gas particles do not attract or repel each other B. gas particles are attracted to the walls of the container they are in C. the kinetic energy of gas particles is unrelated to temperature D. gas particles attract and repel each other - answerAnswer: A What is the pH of a solution with a hydronium ion concentration of 1 X 10-8 moles/dm3? A. 7 B. 6 C. 8 D. 7.5 - answerAnswer: C Fish in an aquarium require oxygen to live, which is usually done by pumping air into the fish tank using a mechanical pump. If all other things remain constant, the most effective transfer of oxygen to water comes from: A. small bubbles of air B. large bubbles of air C. bubbling of cold air D. slow bubbling of air - answerAnswer: A Which of the following are NOT carbonate minerals: A. calcite B. magnesite C. dolomite D. graphite - answerAnswer: D Under which of the following conditions will iron rust: A. in water B. in water and oxygen C. in oil D. in oil and water - answerAnswer: B Which of the following is NOT true about the Periodic Table: A. metals tend to gain ele ctrons while nonmetals tend to lose electrons B. metals tend to lose electrons while nonmetals tend to gain electrons C. elements with metallic properties are found on the left side of the table D. alkali metals are found in the vertical column that contains lithium - answerAnswer: A The reaction of hydrocarbons with oxygen to produce carbon dioxide, water and heat is called: A. fission B. fusion C. endothermic D. combustion - answerAnswer: D Until the early 1960's, what group of elements were called the inert gases: - answerAnswer: Noble Gases What is the only known substance for which there is no triple point: - answerAnswer: Helium What is the branch of chemistry that deals with the relationship between electricity and chemical reactions? - answerAnswer: Electrochemistry Convert 673 Kelvin into degrees centigrade: - answerAnswer: 400oC Convert -40oF into Centigrade: - answerAnswer: -40oF-32/1.8 = -40o Centigrate What is the concentration, in parts per billion, of a solution that contains 1 microgram of solute per liter? - answerAnswer: 1 PPB