January 2009 Chemistry Regents #56-58

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 54-55 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

 

Other Regents Exams

Questions

Base your answers to questions 56 through 58 on the information below.

The compounds NH4Br(s) and NH3(g) are soluble in water. Solubility data for NH4Br(s) in water are listed in the table below.

56 On the grid in your answer booklet, plot the data from the data table. Circle and connect the points. [1]

Link TO SEE THE ANSWER

57 Determine the total mass of NH4Br(s) that must be dissolved in 200. grams of H2O at 60.C to produce a saturated solution. [1]

HIGHLIGHT TO SEE THE ANSWER

210.g

at 60.C, 100g of water hold 105g NH4Br, so 210g will dissolve in 200g of water

58 Compare the solubilities of NH4Br(s) and NH3(g), each in 100. grams of H2O, as temperature increases at standard pressure. Your response must include both NH4Br(s) and NH3(g). [1]

HIGHLIGHT TO SEE THE ANSWER

As temperature increases, the solubility of NH4Br(s) in H2O increases and the solubility of NH3(g) in H2O decreases.

NH4Br becomes more soluble and NH3 becomes less soluble.

on to Questions 59-61

 

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

 
Back to Regents Exams