January 2009 Chemistry Regents #59-61

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Questions

Base your answers to questions 59 through 61 on the information below.

Carbon forms molecular compounds with some elements from Group 16. Two of these compounds are carbon dioxide, CO2, and carbon disulfide, CS2.

Carbon dioxide is a colorless, odorless gas at room temperature. At standard temperature and pressure, CO2(s) changes directly to CO2(g).

Carbon disulfide is formed by a direct reaction of carbon and sulfur. At room temperature, CS2 is a colorless liquid with an offensive odor. Carbon disulfide vapors are flammable.

59 Identify one physical property and one chemical property of CS2. [1]

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Physical property:

Chemical property:

liquid at room temperature

CS2 can be decomposed into C and S.

colorless

flammable
odor  

boiling point above room temperature

 

 

60 State what happens to the potential energy of CO2 molecules during this phase change of CO2. [1]

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PE increases

61 Compare the intermolecular forces in CO2 and CS2 at room temperature. [1]

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Carbon disulfide has stronger intermolecular forces than carbon dioxide.

CO2 has weaker intermolecular forces

on to Questions 62-64

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-66 Questions 67-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-79 Questions 80-81

 
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