key2 - Chemistry 1151K Test II 1 After four half-lives what...

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Chemistry 1151K Test II 1. After four half-lives, what fraction of the original radioactive isotope remains in a sample? a. none b. 1/16 c. 1/8 d. 1/4 2. Iodine-131 is useful in diagnosis of problems in the a. thyroid b. heart c. uptake of vit. B 12 d. bone 3. Archaeologists unearth a bone sample that has one-fourth the carbon-14 that would be found in a new bone sample. The half life of carbon-14 is 5730 years. How old is the bone sample? a. 1432 yrs b. 2865 yrs c. 5730 yrs d. 11,460 yrs 4. The sulfate ion is a. S 2- b. SO 4 2- c. S 2+ d. SO 4 6- 5. Aluminum reacts with fluorine to form a. AlF b. AlF 3 c. Al 3 F d. Al 2 F 3 6. Iron(II) chloride is a. Fe 2 Cl b. FeCl 2 c. Fe 2 Cl 3 d. FeClO 2 7. Which element is more electronegative than the others? a. O b. Na c Fe d. K 8. The formula for hydrogen carbonate ion (bicarbonate ion) is a. HC - b. HCO 3 - c. CO 2 2- d. HCO 3 2- 9. The ammonium ion is a. NH 2 + b. NH 3 + c. NH 4 + d. NH 2 - 10. KNO 2 is a. potassium nitride b. potassium nitrite
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This note was uploaded on 11/16/2011 for the course CHEM 1151k taught by Professor Staff during the Fall '08 term at Valdosta State University .

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key2 - Chemistry 1151K Test II 1 After four half-lives what...

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