TEST BANK FOR PRINCIPLES OF CHEMISTRY A MOLECULAR APPROACH, 1ST EDITION: TRO

Principles of Chemistry: A Molecular Approach (Tro) Chapter 1 Matter, Measurement, and Problem Solving 1) Molecules can be described as A) a mixture of two or more pure substances. B) a mixture of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) a heterogeneous mixture E) a homogeneous mixture 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) Dalton's Atomic Theory states A) that all elements have several isotopes. B) that matter is composed of small indestructible particles. C) that the properties of matter are determined by the properties of atoms. D) that energy is neither created nor destroyed during a chemical reaction. E) that an atom is predominantly empty space. Answer: B Diff: 1 Page Ref: 1.2 4) The statement, "In a chemical reaction, matter is neither created nor destroyed." is called A) The Law of Conservation of Mass B) Dalton's Atomic Theory C) The Scientific Method D) The Law of Multiple Proportions E) The Law of Definite Proportions Answer: A Diff: 1 Page Ref: 1.2 5) 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