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105af04_sample_e1

105af04_sample_e1 - Sept 16 2004 Chem104a 1 1(20 pts 1a(3...

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Sept. 16, 2004 Chem104a 1 1. (20 pts.) 1a. (3 pts.) You are an alien on another planet in another galaxy, and you are a scientist. The laws of Gay-Lussac and Avogadro are known. You find that when volumes are combined for some alien gaseous elements, you get the following results. A and B are two alien elements that combine to form a compound. (A x B B y ) is a new compound whose composition is unknown. The volumes used in the reaction are given below the equation. For the gases 2A s + B t Î 3(A x B B y ) 2 vol 1 vol 3 vol What are the correct formulas for A, B and (AB) based on this information. A: ______________ B: ________________ AB: ________________ A 2 B A 3 B B 3 1b. (5 pts.) Absolute zero on the Celsius scale is –273.15 ° C. This defines the Kelvin scale. In the English system the absolute zero scale is the Rankin scale. What is absolute zero in Fahrenheit units for the Rankin scale? F = 9 5 C + 32 F = 9 5 273.15 ( ) + 32 F = − 459.67 Answer: ________________ 1c. (6 pts.) Give the names for the following compounds: (NH 4 ) 2 Cr 2 O 7 __Ammonium dichromate__ Ca(ClO 4 ) 2 ____Calcium perchlorate____________ H 2 S ___hydrogen sulfide______________ 1d. (6 pts.) Write the correct formula for the following compounds or ions:
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Sept. 16, 2004 Chem104a 2 hydrogen sulfate ion __________________________ HSO 4 - Chromate ion ______________________ CrO 4 2- Calcium phosphate __________________ Ca 3 (PO 4 ) 2 II. (6 pts.) ( Zumdahl, p 76 #34) a.
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