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1.) A bag of ice containing 325 g of ice at 0 degrees C was placed on a patient’s sore thigh muscles. When the ice bag was removed, all the ice had melted, and the liquid water in the bag had a temperature of 18 degrees C. Normal body temperature is 37 degrees C.
Density of ice at 0 degrees C = 0.917 g/mL.
Density of liquid water at 18 degrees C = 1.0 g/mL
What was the final volume of liquid water in the ice bag?
Determine how many kilojoules of heat were absorbed by the ice.
2.) The half-life of an unknown element is 50 years. You find a rock that has 1/16th of this original parent element in it, and 15/16th of the daughter (decay) element in it.
How old is this rock?
3.) Often during surgery or when patient’s have a cardiac arrest or stroke, the body temperature is lowered because it slows everything down and reduces the amount of oxygen needed by the body. Various methods are used to lower patient’s body temperatures in this way, including IV drip of cooled saline solutions, cool water blanket wraps, or cooling caps worn on the head. A patient with a total blood volume of 5,800 mL is cooled from an initial body temperature 39.2 °C to 33.7 °C.
Average density of human blood: 1.06 g/mL
Density of water: 1.0 g/mL
How many kilojoules of heat were lost from the patient during this cooling procedure?
4.) Major intermolecular forces include the following: ionic, dipole-dipole attractions, hydrogen bonds, and dispersion forces. Indicate what type of intermolecular force occurs between particles of the compounds listed below.
NF3
H2O
LiCl
OBr2
HBr
IBr

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