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1.  Which of the following concerning an alpha particle is false?

(a) has a mass of 4 amu

(b) has a 1+ charge

(c) is a helium nucleus

(d) contains 2 neutrons

 

2. Electromagnetic radiation includes

(a) beta particles and gamma rays

(b) gamma rays and X-rays

(c) alpha particles and X-rays

(d) gamma rays and alpha particles

 

 3. Iodine-131 ( ) is used as a radioactive tracer in thyroid gland studies.  Iodine-131 ( ) emits a beta particle and a gamma ray to form:

 

(a) xenon-131 ( )

(b) tellurium-131 ( )

(c) antimony-127 ( )

(d) cesium-135 ( )

 

4.  The product of the alpha decay of uranium-235 ( ) is:

(a) uranium-234 ( )

(b) radium-226 ( )

(c) plutonium-239 ( )

(d) thorium-231 ( )

 

5. After 28 days a 4.0 g  sample of phosphorous-32 ( ) ( contains only 1.0 g of phosphorus-32.  What is the half-life of phosphorus-32?

(a) 16 days

(b) 14 days

(c) 9.3 days

(d) 7 days

 

6. In nuclear fission

(a) atoms break into fragments when struck by neutrons

(b) a chain reaction does not occur

(c) energy is released mostly as light rather than heat

(d) all of these

 

7. A reaction in which two light nuclei combine to form a heavier nucleus is terms:

(a) fission

(b) a chemical reaction

(c) background radiation

(d) fusion

8. Radioisotopes have unstable nuclei because:

(a) neutrons entering the nuclei cause fission

(b) they have abnormal neutron / proton ratios

(c) valence shell electrons are easily ionized

(d) they all have high atomic numbers

 

9. The unit of radiation that measures the rate of radioisotope decay is the

(a) roentgen

(b) curie

(c) rad

(d) rem

 

10. Ionizing radiation is

(a) equally damaging to all cells

(b) only produced in nuclear reactors

(c) most damaging to fast-dividing cells

(d) only produced in chain-reactions

 

11. Carbon-carbon bonds in alkanes are

(a) composed of two electrons

(b) nonpolar

(c) free to rotate

(d) all of these

 

12. Which of the following is a structural isomer of pentane?

(a) 2-methylpentane

(b) 2-methylhexane

(c) 3-ethylpentane

(d) 2-methylbutane

 

13. An unsaturated straight chain hydrocarbon with seven carbons is

(a) 3-heptane

(b) 2-heptene

(c) 2-methylhexane

(d) 3-octene

 

14. A carbon-carbon double bond contains

(a) a sigma bond

(b) a pi bond

(c) two pi bonds

(d) both (a) and (b)


15. Which compound has the highest boiling point

(a) hexane

(b) decane

(c) heptane

(d) butane

 

16. The carbon-carbon sigma bond in the simplest alkyne ethyne (C2H2)

(a) consists of overlapping sp hybrid orbitals

(b) consists of overlapping sp2 hybrid orbitals

(c) consists of overlapping sp3  hybrid orbitals

(d) none of these

 

17. Which of the following is the general formula for a ketone?

(a)

(b)

(c)

(d)

 


 

18. Which of the following is the general formula for an alcohol?

(a)

(b)

(c)

(d)

 

 

19. The compound hexenal is an

(a) alkane

(b) alchohol

(c) aldehyde

(d) aromatic

 

20. Identify the correct statement

(a) The benzene molecule is a flat (planar) structure

(b) Benzene is a saturated hydrocarbon

(c) The benzene molecule can be in the “boat” or “chair” configuration

(d) Benzene is also classified as an alkene

 

21. (a) Name the following compound

  

  

(b)  Draw the structural formula (showing all carbons, bonds, and hydrogens) of

3,4-dimethyl-1-hexene.

  

22. Briefly explain carbon-14 dating.  In your explanation, you may find it helpful to refer to the following equations (if necessary, feel free to use the back of this sheet for your answer):