91) How many moles and how many atoms of zinc are in a sample weighing 34.9 g? A) 0.533 mol, 8.85 ×

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91) How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

A) 0.533 mol, 8.85 × atoms

B) 0.533 mol, 3.21 × atoms

C) 1.87 mol, 3.10 × atoms

D) 1.87 mol, 1.13 × atoms

92) Which statement about nuclear reactions is true?

A) New elements are never produced in a nuclear reaction.

B) Nuclear reactions involve valence electrons.

C) The rate of a nuclear reaction is affected by catalysts.

D) Tremendous amounts of energy are involved in nuclear reactions.

93) The term “nucleons” refers to the number of ________ in the atom.

A) neutrons

B) protons

C) protons and neutrons

D) protons, neutrons, and electrons

94) The number of nucleons in an atom or ion is the same as the

A) atomic number.

B) charge on the atom or ion.

C) mass number.

D) none of these

95) The number of nucleons in a U2+ nucleus is

A) 92.

B) 144.

C) 236.

D) 328.

96) The number of neutrons in Fe2+ is

A) 26.

B) 29.

C) 53.

D) 55.

97) “Isotopes” are atoms with the same number of ________ but different number of ________.

A) electrons, protons

B) neutrons, protons

C) protons, electrons

D) protons, neutrons

98) Which of the following statements is not correct when balancing a nuclear equation?

I.The mass numbers must be conserved on both sides of the reaction arrow.

II.The ionic charges must be conserved on both sides of the reaction arrow.

III.The atomic numbers must be conserved on both sides of the reaction arrow.

IV.The elements must be the same on both sides of the reaction arrow.

A) II only

B) II and III

C) I and III

D) II and IV

99) An alpha particle is

A) H+.

B) H+.

C) H+.

D) He2+.

100) When a substance decays by alpha radiation, the mass number of the nucleus ________ and the atomic number ________.

A) increases by 4, increases by 2

B) reduces by 4, reduces by 2

C) increases by 2, increases by 4

D) reduces by 2, reduces by 4

 

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