January 2011 Chemistry Regents #72-74

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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 2C 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]

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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]

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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

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