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Investigation 8

Investigation 8 - Justin Benson CHM 113 Lab TA Jeanette...

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Justin Benson CHM 113 Lab TA: Jeanette Nangreave Investigation 8: How Hot Is The Water? Introduction: In Chemistry, all physical and chemical changes can be proven through changes in energy. The frist law of thermodynamics states that energy is neither created nor destroyed and is therefore constant. This law along with thermochemistry was used to discover the temperature of hot water using a thermometer that only read up to 40 o C and to calculate the amount of heat(J) transferred. Because of this limitation, the first law of thermodynamics was applied to find the initial temperature( o C) of the hot water. By applying the principles and laws of thermochemistry as well as basic algebra, the amount of heat(J) transferred was calculated. Experimental: Materials - Coffeepot - 40 o C Thermometer - Styrofoam cups and lids - Stirrers - Scale in grams - Tap Water - Samples of aluminum Procedure 1. The cool substance (aluminum or tap water) was massed first (g) and the initial temperature was taken. 2. Then the hot water from the coffee pot was poured into a Styrofoam cup and massed (g) . 3. Then the cool substance was added to the hot water and left to stand for 1 minute. The final temperature( o C) was taken and recorded. 4. The formula, q = mC∆T was used to find the amount of heat(J) that was gained by the cooler substance.
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