C__DOCUME~1_MICHAE~1_LOCALS~1_Temp_plugtmp-2_PP2

C__DOCUME~1_MICHAE~1_LOCALS~1_Temp_plugtmp-2_PP2 - Chem003...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem003 – Fall 2006 GWU 1 Practice Problems for Exam 2 1. How many neutrons are there in the potassium-40 isotope? A. 59 B. 40 C. 21 D. 19 2. The isotope 31 15 P is also called A. phosphorus-15 B. phosphorus-16 C. phosphorus-31 D. phosphorus-46 3. The following nuclear reaction is an example of 88 226 Ra 2 4 He + 86 222 Rn A. alpha decay B. beta decay C. gamma decay D. DKNY 4. An alpha particle is the same as a A. helium-3 nucleus B. helium-4 nucleus C. helium-5 nucleus D. proton 5. Thorium-234 undergoes beta decay: 90 234 Th 1 0 e + Q . What element is Q? A. 234 91 Pa B. 234 89 Ac C. 233 90 Th D. 233 91 Th 6. 222 86 Rn decays by emission of an alpha particle. The product of this decay is A. 226 88 Ra B. 218 84 Po C. 218 88 Ra D. 220 86 Rn 7. 214 83 Bi decays by beta emission. The product is A. 214 84 Bi B. 214 84 Po C. 210 82 Pb D. 212 79 Au 8. The process of beta emission can be envisioned as the A. conversion of a proton to a neutron and electron. The electron is emitted. B. conversion of a neutron to a proton and electron. The electron is emitted. C. conversion of a neutron to a proton and electron. The proton is emitted. D. conversion of a proton to a neutron and electron. The proton is emitted. 9. The atomic number increases by 1 unit during what type of radioactive decay? A. alpha B. beta C. gamma D. none of these 10. After three half-lives, what fraction of the original radioactive isotope remains in a sample? A. none B. 1/16 C. 1/8 D. 1/4 11. Nitrogen-13 has a half-life of 10 minutes. How much of a 16 mg sample would remain after 40 minutes? A. 0.5 mg B. 1 mg C. 2 mg D. 4 mg 12. The amount of a radioactive isotope that remains after two half-lives have passed is A. 98% B. 75% C. 50% D. 25%
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chem003 – Fall 2006 GWU 2 13. Plants incorporate carbon as long they live. Once a plant dies, it takes how many years for 99.9% of the carbon-14 to decay (half-life of C-14 is 5730 years)? A. 573 yrs B. 2865 yrs C. 5730 yrs D. 57300 yrs 14. Carbon-14 dating of ancient objects is particularly effective because C-14 A. has the shortest half-life B. is continuously produced in the upper atmosphere and its ratio to c-12 in living systems and the environment is constant C. is a stable isotope and is therefore particularly easy to work with D. decays by a simple fission reaction 15. Phosphorus-30 decays by positron emission. The product is A. silicon-30 B. phosphorus-29 C. sulfur-30 D. sulfur-29 16. Positron emission tomography (PET) is a A. therapy for cancer using positrons B. diagnostic technique for monitoring dynamic processes in the body, such as brain activity C. device for containing a nuclear fusion reaction D. mechanism for transmutation of elements 17. Nuclear fission is a process by which the nucleus of an atom A. splits into two or more fragments spontaneously B. is induced to split into two or more fragments by some external source C. combines with another nucleus to produce a larger nucleus D. loses a proton with the release of a large amount of energy
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 13

C__DOCUME~1_MICHAE~1_LOCALS~1_Temp_plugtmp-2_PP2 - Chem003...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online