SOLVED

31) When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers. Which law does this refer to? A) Law of Definite Proportions B) Law of the Conservation of Mass C) Law of Modern Atomic Theory D) Law of Multiple Proportions E) First Law of Thermodynamics 32) Which of the following is an example of the law of multiple proportions? A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37. B) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C. C) Two different samples of table salt are found to have the same ratio of sodium to chlorine. D) The atomic mass of bromine is found to be 79.90 amu. 33) Which of the following statements is FALSE according to Dalton’s Atomic Theory? A) Atoms combine in simple whole number ratios to form compounds. B) All atoms of chlorine have identical properties that distinguish them from other elements. C) One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide. D) Atoms of sodium do not change into another element during chemical reaction with chlorine. E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. 34) Identify the description of an atom. A) neutrons and electrons in nucleus; protons in orbitals B) neutrons in nucleus; protons and electrons in orbitals C) protons and neutrons in nucleus; electrons in orbitals D) protons and electrons in nucleus; neutrons in orbitals E) electrons in nucleus; protons and neutrons in orbitals 35) Identify the charges of the protons, neutrons, and electrons. A) protons +1, neutrons 0, electrons -1 B) protons 0, neutrons -1, electrons +1 C) protons -1, neutrons 0, electrons +1 D) protons 0, neutrons +1, electrons -1 E) protons +1, neutrons -1, electrons 0 36) The mass number is equal to A) the sum of the number of the electrons and protons. B) the sum of the number of the neutrons and electrons. C) the sum of the number of protons, neutrons, and electrons. D) the sum of the number of protons and neutrons. 37) What does “X” represent in the following symbol?  X A) mercury B) chlorine C) scandium D) bromine E) selenium 38) What does “X” represent in the following symbol? X A) silicon B) sulfur C) zinc D) ruthenium E) nickel 39) Determine the number of protons, neutrons and electrons in the following. X A) p+ = 18n° = 18e- = 22 B) p+ = 18n° = 22e- = 18 C) p+ = 22n° = 18e- = 18 D) p+ = 18n° = 22e- = 40 E) p+ = 40 n° = 22e- = 18 40) Determine the number of protons, neutrons and electrons in the following. X A) p+ = 12n° = 25e- = 12 B) p+ = 12n° = 12e- = 13 C) p+ = 12n° = 13e- = 12 D) p+ = 25n° = 12e- = 13 E