Order Nuclear Chemistry Homework Assignment

Order Nuclear Chemistry Homework Assignment
Order 5890230
Order Nuclear Chemistry Homework Assignment
1. Coulomb’s law states that like charges repel. Which of the following
most accurately explains how the protons in the nucleus can form a stable
nucleus?
(A) ‘The positive charges attract each other when they are within a very
short distance of each other.
(B) ‘There are negative charges in the nucleus that neutralize the positive
charges.
(C) The neutrons cancel out the charges of the protons.
(D) ‘The repulsive force is very small because protons are spaced far from
other protons.
(E) The neutrons form a tight cage around the protons that keep them
from leaving the nucleus.
2. The average density of an atomic nucleus is on the order of magnitude
closest to which of the following? (The density of osmium, Os, the
heaviest known element, is 23 g cm~>. The mass of an average Zn nucleus
is approximately 1 x 10-** g and the radius of a nucleus of that mass is
approximately 5 x 10-!3 cm.)
(Ay—10- ecm
(B) 103 gcm%
(C) 10″ ecm”
QD) 21078 cm
(E) 10% gem”
Order Nuclear Chemistry Homework Assignment
Nuclear Chemistry ¢ 101
In 325 days, a 30-gram sample of °°Zr decayed until approximately 1 gram of Zr remained in the sample. The half-life of °°Zr is closest to:
(A) 11 days
(B) . 29 days
(C) 65 days
(D) 81 days
(E) 162 days
If 93.75 percent of a sample of pure radioisotope X decays in 24 days,
what is the half-life of X?
(A) 4 days
(B) 6 days
(C) 12 days
(D) 18 days
(E) 24 days
If 12.5 percent of a sample of pure radioisotope Z remains after 30 days,
what is the half-life of Z?
(A) 2.4 days
(B) 8 days
(C) 10 days
(D) 12.5 days
(E) 30 days
The half-life of radioisotope J is 2 years. If the initial amount of J present is
60 grams, approximately how much is expected to remain after 12 years?
(A) 30 grams
(B) 12 grams
(C) 5 grams
(D) 2 grams
(E) 1 gram
Which of the following particles is emitted by an atom of “°K when it
decays into an atom of