CHAPTER 1: BASIC CONCEPTS ABOUT MATTER MULTIPLE CHOICE 1) Which of the following is a property of both gases and liquids? a) definite shape c) definite volume b) indefinite shape d) indefinite volume ANS: B DIF: Easy KEY: Chemistry | general chemistry | phases NOT: Section 1.2 2) In which of the following pairs of properties are both properties chemical properties? a) freezes at 10 C and nonflammable b) decomposes at 500 C and reacts with bromine c) poor conductor of heat and is reddish brown in color d) has a low density and is very hard ANS: B DIF: Moderate KEY: Chemistry | general chemistry | general concepts | properties |chemical NOT: Section 1.3 3) When a substance undergoes a chemical change it is always true that a) it liquifies b) it changes from a solid to a gas c) it is converted to a new kind of matter with a different composition d) the temperature of the substance increases ANS: C DIF: Moderate KEY: Chemistry | general chemistry | general concepts | chemical change NOT: Section 1.4 4) The description “two substances present, two phases present” is correct for a) heterogeneous mixtures c) elements b) homogeneous mixtures d) compounds ANS: A DIF: Moderate KEY: Chemistry | general chemistry | general concepts | mixtures NOT: Section 1.5 5) Which of the following statements about heterogeneous and homogeneous mixtures is correct ? a) It is possible to have heterogeneous mixtures in which all the components are liquids. b) A homogeneous mixture contains visibly different parts, or phases. c) All of the phases in a heterogeneous mixture must be in the same state. d) No two phases in a heterogeneous mixture can be in the same state. ANS: A DIF: Moderate KEY: Chemistry | general chemistry | mixtures NOT: Section 1.5 6) Which of the following statements is correct ? a) Elements, but not compounds, are pure substances. b) Compounds, but not elements, are pure substances. c) Both elements and compounds are pure substances. d) Neither elements nor compounds are pure substances. ANS: C DIF: Moderate KEY: Chemistry | general chemistry | general concepts | pure substances NOT: Section 1.6 7) An element is a substance that a) can be broken down into simpler substances by physical means. b) cannot be broken down into simpler substances by physical means. c) can be broken down into simpler substances by chemical means. d) cannot be broken down into simpler substances by chemical or physical means. ANS: D DIF: Easy KEY: Chemistry | general chemistry | general concepts | element NOT: Section 1.6 8) A pure substance F is found to change upon heating into two new pure substances M and Y. Both M and Y may be decomposed by chemical means. From this we may conclude that: a) F is an element, M and Y are compounds. b) F is a compound, M and Y are elements. c) F, M and Y are all elements. d) F, M and Y are all compounds. ANS: D DIF: Difficult KEY: Chemistry | general chemistry | general concepts | compound; element; mixtures NOT: Section 1.5| Section 1.6 9) Which of the following statements concerning the known elements is correct ? a) No new elements have been identified within the last 40 years. b) Most elements occur naturally. c) 108 elements are known at present d) Scientists have synthesized all possible non -natural elements. ANS: B DIF: Easy KEY: Chemistry | general chemistry | elements NOT: Section 1.7 10) The most abundant elements in the universe and the Earth's crust are, respectively, a) oxygen and iron. c) helium and carbon. b) hydrogen and helium. d) hydrogen and oxygen. ANS: D DIF: Moderate KEY: Chemistry | general chemistry | general concepts | element NOT: Section 1.7 11) In which of the following sequences of elements does each of the elements have a two -letter chemical symbol? a) barium, iron, nitrogen c) silicon, zinc, hydrogen b) selenium, nickel, strontium d) iodine, xenon, titantium ANS: B DIF: Easy KEY: Chemistry | general chemistry | general concepts | element |nomenclature NOT: Section 1.8 12) In which of the following sequences of elements does each of the elements have a one -letter chemical symbol? a) indium, carbon, silver c) antimony, boron, nitrogen b) iodine, boron, tungsten d) nitrogen, germanium, bromine ANS: B DIF: Easy KEY: Chemistry | general chemistry | general concepts |element NOT: Section 1.8 13) Which one of the following statements about atoms is incorrect ? a) An atom is the smallest “piece” of an element that can exist and still have the properties of the element. b) Free isolated atoms are rarely encountered in nature. c) Atoms may be decomposed using chemical change. d) Only one kind of atom may be present in a homoatomic molecule. ANS: C DIF: Moderate KEY: Chemistry | general chemistry | atoms NOT: Section 1.9 14) Which one of the following statements about heteroatomic molecules is correct ? a) No two atoms in a heteroatomic molecule may be the same. b) Upon chemical subdivision, heteroatomic molecules always yield two or more kinds of atoms. c) Heteroatomic molecules maintain the properties of their constituent elements. d) Molecules of certain elements are heteroatomic. ANS: B DIF: Moderate KEY: Chemistry | general chemistry | molecules NOT: Section 1.9 15) Which of the following pairings of chemical formulas and "molecular descriptions" is incorrect ? a) LiCN and "triatomic" c) N2 and "homoatomic" b) KCl and "heteroatomic" d) SiO 2 and "diatomic" ANS: D DIF: Moderate KEY: Chemistry | general chemistry | molecules NOT: Section 1.9 16) In which of the following pairs of chemical formulas do both formulas represent compounds? a) O2 and O 3 c) HCN and N 2 b) CO 2 and O 2 d) N2O4 and NO 2 ANS: D DIF: Easy KEY: Chemistry | general chemistry | chemical formulas NOT: Section 1.10 17) Which of the following is a correct description for a sample of ice cubes in water? a) one phase present, one substance present b) one phase present, two substances present c) two phases present, one substance present d) two phases present, two substances present ANS: C DIF: Moderate KEY: Chemistry | general chemistry | general concepts | compound; element; mixtures NOT: Section 1.5 18) Consider the chemical formulas CoI 2 and COI 2. It is true that they a) contain identical kinds of atoms b) identify the same compound c) contain different kinds and numbers of atoms d) can be described by none of the above ANS: C DIF: Moderate KEY: Chemistry | general chemistry | chemical formulas NOT: Section 1.10 19) In which of the following pairs of chemical formulas do the two members of the pair contain the same number of elements as well as the same number of atoms? a) Cs and CS c) CoCl 2 and CoCl 3 b) CoBr 2 and COBr 2 d) NH 4Br and NiSO 4 ANS: D DIF: Moderate KEY: Chemistry | general chemistry | chemical formulas NOT: Section 1.10 20) The total number of atoms present in one formula unit of Co 2(SO 4)3 is a) 14 c) 16 b) 15 d) 17 ANS: D DIF: Moderate KEY: Chemistry | general chemistry | chemical formulas NOT: Section 1.10 21) Which of the following is a property of both the liquid state and the solid state? a) a definite shape b) an indefinite volume c) an indefinite shape and a definite volume d) more than one correct response e) no correct response ANS: E DIF: Easy KEY: Chemistry | general chemistry | phases NOT: Section 1.2 22) In which of the following pairs of properties are both properties physical properties? a) melts at 73 C, decomposes upon heating b) good reflector of light, blue in color c) has a high density, is very hard d) more than one correct response e) no correct response ANS: D DIF: Moderate KEY: Chemistry | general chemistry | general concepts | properties NOT: Section 1.3
