August 2010 Chemistry Regents #61-63

Highlight to reveal answers and explanations

 

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

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 

Other Regents Exams

Questions

 

Base your answers to questions 61 through 63 on the information below.

61 Convert the boiling point of hydrogen chloride at standard pressure to Kelvins. [1]

HIGHLIGHT TO SEE THE ANSWER

NOTE= Kelvin is always positive.  This Equation is found on the back of the Reference Tables

K= 273 + (-84.9)= 188.1K

62 Explain, in terms of molecular polarity, why hydrogen chloride is more soluble than methane in water at 20.C and standard pressure. [1]

HIGHLIGHT TO SEE THE ANSWER

IN TERMS OF "molecular polarity"- use polar and nonpolar in answer

Molecules of CH4 are nonpolar, but molecules of HCl and H2O are both polar.

Hydrogen chloride and water are both polar.

63 Explain, in terms of intermolecular forces, why ammonia has a higher boiling point than the other compounds in the table. [1]

HIGHLIGHT TO SEE THE ANSWER

IN TERMS OF "intermolecular forces"- use strong or weak in answer

Ammonia has stronger intermolecular forces than either methane or hydrogen chloride.

Ammonia has hydrogen bonding.

 

on to the next questions

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

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 
Back to Regents Exams