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ChemistryAtoms, Molecules, and Ions2.1Multiple-Choice Questions1) According to history, the concept that all matter is composed of atoms was first proposed byA) the Greek philosopher Democritus, but not widely accepted until modern times.B) Dalton, but not widely accepted until the work of Mendeleev.C) Dalton, but not widely accepted until the work of Einstein.D) Dalton, and widely accepted within a few decades.Answer:A2)The observation that 15.0 g of hydrogen reacts with 120.0 g of oxygen to form 135.0 g of water isevidence for the law ofA) definite proportions.B) energy conservation.C) mass conservation.D) multiple proportions.Answer:C3) The observation that 4.0 g of hydrogen reacts with 32.0 g of oxygen to form a product withO:H mass ratio = 8:1, and 6.0 g of hydrogen reacts with 48.0 g of oxygen to form the same productwith O/H mass ratio = 8:1 is evidence for the law ofA) definite proportions.B) energy conservation.C) mass conservation.D) multiple proportions.Answer:A4) Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 3.2 g ofmethane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?A) 7.2 gB) 8.8 gC) 14.8 gD) 16.0 gAnswer:A
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5) Sodium metal and water react to form hydrogen and sodium hydroxide. If 5.98 g of sodium react withwater to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide, what mass of water was consumedin the reaction?A) 4.68 gB) 5.98 gC) 10.14 gD) 10.66 gAnswer:A6) A sample of pure lithium carbonate contains 18.8% lithium by mass. What is the % lithium by mass ina sample of pure lithium carbonate that has twice the mass of the first sample?A) 9.40%B) 18.8%C) 37.6%D) 75.2%Answer:B7) A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How muchcalcium is contained in 45.0 g of calcium fluoride?A) 2.56 gB) 7.70 gC) 15.0 gD) 23.1 gAnswer:D8) The observation that hydrogen and oxygen can react to form two compounds with different chemicaland physical properties, one having an O:H mass ratio = 8:1 and the other having an O:H mass ratio =16:1 is consistent with the law ofA) definite proportions.B) energy conservation.C) mass conservation.D) multiple proportions.Answer:D9) Which of the following statements isnota postulate of Dalton's atomic theory?A) Each element is characterized by the mass of its atoms.B) Atoms are composed of protons, neutrons, and electrons.C) Chemical reactions only rearrange atomic combinations.D) Elements are composed of atoms.Answer:B

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