2.3 MULTIPLE CHOICE 3) The vertical columns or she pere toble re calee 0) perinds 4) Most elements in the periodic table are noble gases 5) Elements in a periodic aroup have simila chemical properties, a) densities D) plhysical propesties 6) Which of the following statements does not describe a chemical property of osygen? n) Oxygen combines with carhon to form carbon dioxide A) Iran wil rst in the presence of orygen D) When coal is burned in oxvien, the process is called en molecules combustion 7) Methane and oxygen react to form carbon dioxide and water. What mass of water is formed 1 3.2 got methane reacts wih 12.M of oxygen to produce 8.8 of carbon dioxide? A) 7.2 B 8) 8.8 u C) 14.8 B D) 16.0 B 8) The current model of the atom in which essentially all of an atom's mass is contained in a very small nucteus, whereas most ot an atom's volume is due to the space in which the atom's electrons move was established by A) Millikan's oil drop experiment C) Thomson's cathode ray tube experiment B) Rutherford's gold foil experiment. D) None of these 9) The mass number of an atom is equal to the number of A) electrons B) neutrons C) protons D) protons plus neutrons 10) Which of the following two atoms are isotopes? 40 24 12 40 12 13 80 41 Ar and Ca B) C and C 18 20 17 35 2.2 SHORT ANSWER QUESTIONS (Fill in the blank, TRUE or FALSE and dimensional analysis calculations) Questions 11 and 12 Complete the sentences in questions 11 and 12 using one of the following definite proportions energy conservation multiple proportions mass conservation 11) The observation that 4.0 g of hydrogen reacts with 32.0 g of oxygen to form a product with O:H mass ratio 8:1, and 6.0 g of hydrogen reacts with 48.0 g of oxygen to form the same product with O/H mass ratio 8:1 is evidence for the law Page 1
