Chemistry

1. what is the minimum protection from alpha particles?
a. lead
b. paper
c. soft tissue
d. wood
5. when the ratio of neutron-to-proton dictates that a neutron must break down it will form
a. a helium nucleus
b. an alpha particle
c. a proton and an electron
d. two protons
6. what determines the type of decay if a nucleus falls outside band of stability? a. the ratio of alpha particles to beta particles
b. the ratio of beta particles to alpha particles
c. the ratio of neutrons to protons
d. the ratio of protons to electrons
7. a positron is emitted when
a. an alpha particle forms
b. a beta particle forms
c. proton converts to a neutron
d. neutron coverts to a proton
8. how does an atom with too few neutrons relative to protons undergo radioactive decay?
a. by converting a proton to a neutron
b. by converting a neutron ton a proton
c. by emitting an alpha particle
d. by emitting a beta particle
9. how much of the original sample would remain after two half-lives have past? a. there would be nothing of the original left
b. there would be 1/2 of the original sample remaining
c. there would be 1/4 of the original sample remaining
d. there would 1/8 of the original sample remaining
11. a reaction where a heavier nucleus splits into smaller nuclei is called
a. a chemical reaction
b. background radiation
c. fission
d. fusion
12. and are used as moderators to capture neutrons in a nuclear reactor.
a. cadmium and other metal
b. carbon and water
c. liquid sodium and water
d. plutonium and neptunium
13. for a person working in a place where they might be exposed to radiation a is routinely used to check their exposure.
a. film badge
b. geiger counter
c. moderating rod
d. scintillation counter
14. radioisotopes are used to do all of the following except
a. analyze matter
b. diagnose medical problems
c. improve the flavor of food
d. treat diseases