Question : 51) Which of the following represents a pair of isotopes? A) : 1282490

 

51) Which of the following represents a pair of isotopes?

A) 14C, 14N

B) 1H, 2H

C) 32S, 32S-2

D) O2, O3

 

52) 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%

 

53) 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

54) The isotopic mass for a particular isotope of gold is 196.9665 amu. The mass number for this gold isotope ________.

A) is 79

B) is 196

C) is 197

D) cannot be determined from the information given

 

55) Three naturally occurring isotopes exist for the hypothetical element athenium. 2.50% of athenium atoms have a relative mass of 26.0 amu, 75.0% of athenium atoms have a relative mass of 27.0 amu, and 22.5% of athenium atoms have a relative mass of 28.0 amu. What is the atomic mass of athenium?

A) 26.8 amu

B) 27.0 amu

C) 28.0 amu

D) 27.2 amu

 

56) Element A exists in three isotopic forms with masses of 21.0, 25.0 and 26.0 amu respectively. Element B also exists in three isotopic forms with masses of 22.0, 24.0 and 26.0 amu respectively. It is true that ________.

A) element A has a higher atomic mass than B

B) element B has a higher atomic mass than A

C) A and B have identical atomic masses since the sums of their isotopic masses are equal

D) you need the percentages of each isotope to determine their atomic masses

 

57) What is the atomic mass of B if 19.9% of all B atoms have a mass of 10.01 amu and 80.1% have a mass of 11.01 amu?

A) 10.21 amu

B) 10.50 amu

C) 10.63 amu

D) 10.81 amu

58) On a hypothetical relative mass scale, the average mass of the atoms of element A was assigned a value of 64.00 gigs. The average mass of the atoms of element B is 36.40% that of element A, and the average mass of the atoms of element C is 6.43 times the mass of A. What is the average mass of the atoms of element C rounded to the nearest 0.01 gigs?

A) 34.98 gigs

B) 439.70 gigs

C) 87.67 gigs

D) 411.52 gigs

 

59) A hypothetical element, Rz, has two isotopes: 169Rz = 168.94 amu and 171Rz = 170.98 amu. Eleven of every fifteen atoms of Rz found in nature exist as the 169Rz isotope. What is the average atomic mass of the element Rz?

A) 169.48 amu

B) 168.95 amu

C) 170.56 amu

D) 171.01 amu

 

60) Three naturally occurring isotopes of carbon exist: The atomic mass of carbon is 12.01 amu. Which of the

three carbon isotopes is most abundant in nature?

A) carbon-12

B) carbon-13

C) carbon-14

D) all three occur with equal abundance

 

 

61) Which of the following was not a conclusion obtained from the gold foil-alpha particle scattering experiment?

A) An atom is mostly empty space.

B) An atom’s nucleus is positively charged.

C) An atom’s nucleus contains protons and neutrons.

D) Most of the mass of an atom is concentrated in its nucleus.

62) Which is a conclusion about the atom’s structure from Rutherford’s gold foil-alpha particle experiments?

A) The electrons occupy most of the total volume of an atom

B) The mass of an atom is distributed uniformly throughout the atom.

C) All alpha particles are affected the same way by the atoms in the gold foil.

D) The positive charge of the atom is uniformly distributed throughout the atom.

 

63) Which experiment led to the notion that the atom contains an extremely small, positively charged nucleus?

A) Millikan’s oil drop experiment

B) Rutherford’s gold foil experiment

C) Thomson’s cathode ray experiment

D) Dalton’s atomic experiment

 

 

 

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