Nuclear chemistry exam

what is the total number of grams of 32-gram sample of 32P remaining after 71.5 days of decay

a. 1.0g

which nuclear emission has no charge and no mass

a. gamma ray

what is the half-life of a radioisotope if 25.0 grams of an original 200.-gram sample of the isotope remain unchanged after 11.46 days

b. 3.82d

an original sample of the radioisotope fluorine-21 has a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21.

b. 4.16s

which particle has the greatest mass

b. an alpha particle

which particle has the least mass

b. beta particle

in which type of reaction do two light nuclei combine to produce a heavier nucleus?

b. fusion

which statement best best describes what happens in a fission reaction?

b. heavy nuclei split into lighter nuclei

which phrase describes a risk associated with producing energy in a nuelcar power plant?

b. production of wastes needing long-term storage

what fraction of s Sr-90 sample remains unchanged after 87.3 years

c. 1/8

a sample of 131I decays to 1.0 gram in 40 days. what was the mass of the original sample.

c. 32g

what radioisotope has the fastest rate of decay?

c. 37Ca

given the nuclear equation representing a nuclear reaction: the particle represented by x is

c. 9/4Be

which balance equation represents nuclear fusion

d. 2/1H +2/1H --> 4/2He

which list of nuclear emissions is arranged in order from the least penetrating power to the greatest penetrating power

d. alpha, beta, gamma ray

SA. 2/1 H+2/1H--->3/2 He

fusion

which radioactive isotope is used in geological dating

uranium-238

SA. state evidence from the passage that the gamma radiation has greater penetrating power than alpha or beta radiation

when comparing the gamma radiation penetrating power to alpha or beta it is much greater. gamma radiation has no mass, no charge, and a high penetrating power. alpha has a mass of 4 +2 charge and a low penetrating power. lastly beta has a mass of 1/2000, which is very small, a charge of -1 is too high tand they are too big to pass through the gamma mass which is none

SA. complete the nuclear equation below for the decay of Cs-137 by writing a notation for the missing product

137/56Ba

SA. determine the time required for a sample of cesium-137 to decay until only 1/8 of the original sample remains unchanged

90.6 years would be required for a sample of the cesium-137 to decay until 48 of its original sample remains unchanged