TEST BANK FOR CHEMISTRY: STRUCTURE AND DYNAMICS, 5TH EDITION, JAMES N. SPENCER, GEORGE M. BODNER, LYMAN H. RICKARD
Chapter 1: Elements & Compounds Introduction 1. Which of the following correctly describes one of the differences between compounds and mixtures? (a) Compounds contain more than one element but mixtures do not. (b) Compounds have a constant composition but mixtures do not. (c) It is easier to separate the elements in a compound than it is to separate the elements in a mixture. (d) All of these statements are true. (e) None of these statements are true. Answer: (b) 2. Which of the following postulates of Dalton's atomic theory is/are still valid today? (I) Matter consists of particles called atoms. (II) Atoms are indestructible and indivisible. (III) All atoms of an element are identical. (IV) Atoms of different elements differ in mass. (V) When the atoms of different elements combine to form compounds they combine in simple whole number ratios. (a) All of these statements are still valid today. (b) I and II are still valid, but not III, IV and V. (c) I, II and III are still valid, but not IV and V. (d) I, IV and V are still valid, but not II and III. (e) II and III are still valid, but not I, IV and V. Answer: (d) 3. Calculate the number of protons in the average potassium atom if the atomic weight of potassium is 39 amu and the atomic number of this element is 19. (a) 19 (b) 20 (c) 39 (d) 58 (e) The number of protons is impossible to determine from this information. Answer: (a) 1-2
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