January 2011 Chemistry Regents #72-74

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 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 

Other Regents Exams

Questions

Base your answers to questions 72 to 74 on the information below.

Cold packs are used to treat minor injuries. Some cold packs contain NH4NO3(s) and a small packet of water at room temperature before activation. To activate this type of cold pack, the small packet must be broken to mix the water and NH4NO3(s). The temperature of this mixture decreases to approximately 2°C and remains at this temperature for 10 to 15 minutes.

72 State the direction of heat flow that occurs when the activated cold pack is applied to the body. [1]

HIGHLIGHT TO SEE THE ANSWER

Heat flows from the body to the cold pack.

from the area of higher temperature to the area of lower temperature

73 Identify both types of bonds in the NH4NO3(s). [1]

HIGHLIGHT TO SEE THE ANSWER

ionic and polar covalent

covalent and ionic

74 Identify the type of mixture formed when the NH4NO3(s) is completely dissolved in the water. [1]

HIGHLIGHT TO SEE THE ANSWER

homogeneous

solution

Next Questions

 

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

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 
Back to Regents Exams