Suppose that a corpse was discovered in a motel room at 11:42 PM and its temperature was 80° Fahrenheit. The temperature of the room is kept constant at 68° Fahrenheit. The temperature of the corpse dropped to 75° Fahrenheit 2 hours later. Find the time of death

A Chemistry 20 student uses a thermometer and a hot plate and measures the boiling point of ethyl alcohol to be 74.3 ºC. Then, she looks in a reference book and finds that the actual boiling point of ethyl alcohol is 78.4 ºC. What is her percent error?

Complete the following table. Be sure each of your answer entries has the correct number of significant digits. a raw carrot food a baked potato an ounce of breakfast corn flakes cal energy content when eaten 3.00 × 10 0 4 kcal 0 220. 0 kJ 460. |x10 X Ś

A student experimentally measured the density of gold as 19.98g/cm^3. A handbook reports a value of 19.32g/cm^3. Calculate the percent error in the student’s measurement.

Calculate the amount of heat needed to boil 126. g of water (H₂O), beginning from a temperature of 99.3 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. Ú ☐ x10 X

Complete the following table. Be sure each of your answer entries has the correct number of significant digits. energy content when eaten food 口0 cal kcal kJ a slice of cooked bacon 3.60 x 10 a small apple 125. a slice of apple 1.69 x 10

An electric current of 481.0 mA transports 530. uC of charge. Calculate the time this took. Be sure your answer has the correct unit symbol and 3 significant digits. 0 x10 X H 8 S

A student calibrated a 10-mL graduated cylinder using water. The empty graduated cylinder weighed 24.378 grams. When it was filled with 9.89 mL of deionized water, it weighed 33.826 grams. The temperature of the water was 21.8oC. What is the density of water, based on these measurements?

A catalytic converter contains between 3.00 and 7.00 g of Pt. The current price of platinumis $26.89 per ounce. What is the range in cost of Pt in one catalytic converter?

15