TEST BANK FOR CHEMISTRY A MOLECULAR APPROACH TRO 3RD EDITION

Chemistry: A Molecular Approach, 3e (Tro) Chapter 1 Matter, Measurement, and Problem Solving Multiple Choice Questions 1) Molecules can be described as A) mixtures of two or more pure substances. B) mixtures of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) heterogeneous mixtures. E) homogeneous mixtures. Answer: C Diff: 1 Page Ref: 1.1 2) Give the composition of water. A) two hydrogen atoms and two oxygen atoms B) one hydrogen atom and one oxygen atom C) two hydrogen atoms and one oxygen atom D) one hydrogen atom and two oxygen atoms Answer: C Diff: 1 Page Ref: 1.1 3) Give the composition of hydrogen peroxide. A) two hydrogen atoms and two oxygen atoms B) one hydrogen atom and one oxygen atom C) two hydrogen atoms and one oxygen atom D) one hydrogen atom and two oxygen atoms Answer: A Diff: 1 Page Ref: 1.1 4) Which of the following represents a hypothesis? A) Sodium reacts with water to form sodium hydroxide and hydrogen gas. B) Nitrogen gas is a fairly inert substance. C) Nickel has a silvery sheen. D) When a substance combusts, it combines with air. E) When wood burns, heat is given off. Answer: D Diff: 1 Page Ref: 1.2 5) Which of the following represents a valid hypothesis? A) Neon does not react with oxygen. B) Sodium metal reacts violently with water. C) Lead is soft and malleable.