labs

__Conduction in Action__

 * Purpose:** How can you investigate the rate of conductivity through different metals?

Procedure: See p.432

Materials: (What we used) -Six 8 cm conduction bars (steel, brass, aluminum ect.) -Felt pen -Ruler -Candles -Matches/Lighter -Metal tongs -Stopwatch

Table and Data: Analyze: 1. How could you tell the heat was being conducted along the metal bars? The bars were cold before the experiment, and afterwards, you could feel the heat radiating off of them, even at the other extremity of the bar. Also, the wax melted during the experiment due to high temperature. 2. a) Did all of the metals conduct heat equally well? No, not all of the metals conducted heat equally well. b) If not, rate the metals in order of best to worst thermal conductor (Will be rated in the order of how fast the wax at 8cm melted.) Lead, Zinc, Aluminum, Copper, Tin, Carbon.
 * ~  ||~   ||~   ||~ Time (s) ||~   ||~   ||~   ||
 * Distance (cm) || Aluminum || Tin || Copper || Lead || Zinc || Carbon ||
 * 0.0 || 0 || 0 || 0 || 0 || 0 || 0 ||
 * 2.0 || 12 || 4 || 18 || 9 || 15 || 25 ||
 * 4.0 || 19 || 14 || 20 || 16 || 18 || 30 ||
 * 6.0 || 29 || 44 || 25 || 28 || 28 || 40 ||
 * 8.0 || 38 || 52 || 45 || 34 || 37 || 64 ||

Conclude and Apply 1. Use the kinetic molecular theory to explain how thermal energy was transferred along the metal bars. The heat of the open flame sped up the particles of the metal closest to it, and those in turn sped up the particles around them until the bar started to fall apart in the tongs. 2. Which of the metals would you use to stir a hot mixture? Explain. I would use carbon, because carbon would be the least likely to melt in the hot mixture, as some of the other metals did in the experiment.