1213+Calorimetry

Some zinc was heated for several minutes in a boiling water bath. After that, the zinc was added to water in Styrofoam cup. The students were given the challenge to heat the water by more than 5˚C using the hot zinc.

DATA:

The table shown below contains all of the measurements made by the students.

Ali ||= 14.75 ||= pellets ||= 103.0 ||= 100 ||= 17.0 ||= 19.0 ||=  || Ali ||= 46.43 ||= pellets ||= 100 ||= 50 ||= 18 ||= 24.5 ||=  ||
 * = Group Members ||= Amount of Zinc (g) ||= Type of Zinc ||= Temperature of Zinc in Boiling Water (˚C) ||= Amount of Water (mL) ||= Initial Water Temp (˚C) ||= Final Water Temp (˚C) ||= Special Observations ||
 * = Adam and Eve ||= 4.342 ||= powder ||= 101.5 ||= 25 ||= 14.0 ||= 19.5 ||= The zinc was hard to pour into the water and some was spilled on the table. ||
 * = Spencer Suki
 * = Spencer Suki
 * = Shannon & Kimmy ||= 31.878 ||= pellets ||= 98 ||= 50 ||= 18 ||= 24.5 ||=  ||
 * = Sho & Alex ||= 24.853 ||= Pellets ||= 111 ||= 100 ||= 18.0 ||= 20.0 ||=  ||
 * = Sho & Alex ||= 51.371 ||= powder ||= 107 ||= 50 ||= 18.0 ||= 30.0 ||=  ||
 * = Tian and Nick ||= 34.4 ||= Pellets ||= 105.0 ||= 40.0 ||= 18.5 ||= 26.0 ||=  ||
 * = Sam and Elena ||= 27.428 ||= Pellets ||= 100 ||= 30.0 ||= 17.5 ||= 23.0 ||=  ||
 * = Shane and Kevin ||= 39.86 ||= Powder ||= 102 ||= 50.0 ||= 17.0 ||= 22.0 ||=  ||
 * = Jun Hao and Annie ||= 30.365 ||= Pellets ||= 110 ||= 59 ||= 0 ||= 10 ||=  ||

RESULTS: The results of this lab can also be used to calculate the specific heat of the zinc metal.
 * = Group Members ||= Temperature Change of Water (˚C) ||= Amount of Heat Entering Water (J) ||= Temperature Change of Zinc (˚C) ||= Specific Heat Capacity of Zinc (J/g-˚C) ||
 * = Spencer Suki Ali ||=  ||=   ||=   ||=   ||
 * = Shannon Kimmy ||=  ||=   ||=   ||=   ||
 * = Sho Alex ||=  ||=   ||=   ||=   ||
 * = Tian Nick ||= 7.5 ||= 1250 ||= -79 ||= 0.46 ||
 * = Sam Elena ||= 5.5 ||= 690 ||= -77 ||= 0.33 ||
 * = Shane Kevin ||=  ||=   ||=   ||=   ||
 * = Jun Hao Annie ||=  ||=   ||=   ||=   ||

The students will compare their results to the actual, published specific heat capacity of zinc.

Students will write two paragraphs related to this lab. 1. This lab involved three examples of thermal equilibrium. How does thermal equilibrium happen? Describe how heat flows from a hot object to a cold object. Why does the temperature in thermal equilibrium stay constant? 2. Explain two reasons why it is difficult to measure the specific heat of zinc precisely.