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Which statement about an atom is false?


A) The nucleus is the center region of an atom.
B) The space occupied by the electrons is primarily empty.
C) The nucleus accounts for a small portion of the mass of an atom.
D) The volume occupied by electrons is referred to as an electron cloud.

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An isotope of which element is used as the standard for the relative mass scale for atoms?


A) carbon
B) oxygen
C) hydrogen
D) helium

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Which statement concerning the molecules depicted is incorrect? Which statement concerning the molecules depicted is incorrect? A) The molecules in box I represent a pure substance. B) The molecules in box III represent a mixture of elements. C) The molecules in box II represent a compound composed of two different elements. D) The molecules in box IV represents two different compounds and an element.


A) The molecules in box I represent a pure substance.
B) The molecules in box III represent a mixture of elements.
C) The molecules in box II represent a compound composed of two different elements.
D) The molecules in box IV represents two different compounds and an element.

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How many atoms of each element are present in 3 formula units of (NH4) 2HAsO4?


A) 10 N atoms, 18 H atoms, 5 As atoms, 18 O atoms
B) 6 N atoms, 9 H atoms, 3 As atoms, 12 O atoms
C) 5 N atoms, 45 H atoms, 4 As atoms, 18 O atoms
D) 6 N atoms, 27 H atoms, 3 As atoms, 12 O atoms

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Which of the following statements is not a part of atomic theory?


A) Chemical change involves a union, separation, or rearrangement of atoms.
B) A pure substance will have a varying relative number of atom types.
C) All matter is made up of atoms.
D) Atoms are considered indestructible during chemical change.

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B

Which of the following properties for the most abundant isotope of an element would not be possessed by the second most abundant isotope of the same element?


A) boiling point is 2403 °C
B) atomic number is 31
C) isotopic mass is 69.92 amu
D) reacts with chlorine to give the compound XCl3

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In which of the following compounds does one molecule of the compound contain 3 elements and 8 atoms?


A) NaHCO3
B) C2H7N
C) H3AsO4
D) POCl3

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Place in the blank the letter of the correct response in each horizontal row of choices. -________ Mass number of an isotope containing 45 protons and 58 neutrons


A) 13
B) 45
C) 58
D) 103

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Determine the relative mass for the hypothetical elements Zp and Wq given the following information: The element Xu has an atomic mass of 24.00 jigs. The element Wq is three times lighter than Xu. The element Zp is two and a half times heavier than a Xu.

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Wq atomic mass is 8.000 jigs Zp atomic mass is 60.00 jigs

For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons


A) For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons A) B) C) D)
B) For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons A) B) C) D)
C) For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons A) B) C) D)
D) For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons A) B) C) D)

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In which of the following pairs of formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?


A) Co and CO
B) NaHCO3 and NaHSO4
C) SO3 and SO2
D) Cl2CO and C2HCl

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Fill in the blanks in the following sentences using words from the following response list: Fill in the blanks in the following sentences using words from the following response list: Items in the response list may be used more than once or need not be used at all. -The mass number for an atom equals the sum of the __________ and __________ in the atom's nucleus. Items in the response list may be used more than once or need not be used at all. -The mass number for an atom equals the sum of the __________ and __________ in the atom's nucleus.

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What is the atomic number of an isobar of What is the atomic number of an isobar of In which there is an equal number of all three types of subatomic particles present? A) 8 B) 9 C) 10 D) 11 In which there is an equal number of all three types of subatomic particles present?


A) 8
B) 9
C) 10
D) 11

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B

Fill in the blanks in the following sentences using words from the following response list: Fill in the blanks in the following sentences using words from the following response list: Items in the response list may be used more than once or need not be used at all. -The mass of a __________ (a neutral species) is many times greater than the mass of an electron and is approximately the same as the mass of a __________. Items in the response list may be used more than once or need not be used at all. -The mass of a __________ (a neutral species) is many times greater than the mass of an electron and is approximately the same as the mass of a __________.

Correct Answer

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What is the total number of hydrogen atoms present in 6 formula units of Mg(C2H3O2) 2?


A) 12
B) 6
C) 36
D) 24

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The diameters and masses of atoms are, respectively, on the order of ________.


A) 10-11 m and 10-11 g
B) 10-23 m and 10-10 g
C) 10-24 m and 10-10 g
D) 10-10 m and 10-23 g

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Place in the blank the letter of the correct response in each horizontal row of choices. -________ Number of elements in the compound Al2SO4


A) 3
B) 4
C) 5
D) 7

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Which formula is correct for a molecule with 4 P atoms, and 10 O atoms?


A) 3 P4O10
B) 2(P2O3) 2
C) P4O10
D) 3 P3O6

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Chlorine, which exists in nature in two isotopic forms, has an atomic mass of 35.5 amu. This means that ________.


A) all chlorine atoms have masses of 35.5 amu
B) 35.5 amu is the upper limit for the mass of a chlorine atom
C) 35Cl and 37Cl each constitute approximately 50% of all chlorine atoms
D) 35Cl constitutes 75% of full chlorine atoms, 37Cl represents 25%

Correct Answer

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Which one of the following statements about molecules is correct?


A) Some compounds have molecules as their basic structural unit.
B) For a molecular compound, the atom is the limit of chemical subdivision.
C) For a molecular compound, the atom is the limit of physical subdivision.
D) Molecules of compounds may be either heteroatomic or homoatomic.

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