Lab+and+HW


 * ​ November 26th, 2009 **

Activity 10-1B p. 432,

Purpose: To investigate the rate of conductivity through different metals

Materials: four 8 cm conduction bars (steel, brass, copper, aluminum), felt pen, ruler, wax strips or candles, matches, hot plate, brick or block of wood, stopwatch, graph paper, coloured pens or pencil crayons

Procedure: See page 432

Data: 7
 * Distance || Aluminum || Zinc || Copper || Carbon || Tin || Lead ||
 * 0.0 || \ \ \ \ \ \ \ || \ \ \ || \ \ \ \ \ || \ \ \ \ \ || \ \ || \ \ \ \ ||
 * 2.0 || 17 s. || 7 s. || 6 s. || 19 s. || 3 s. || 6 s. ||
 * 4.0 || 29 s. || 19 s. || 4 s. || 32 s. || 11 s. || 8 s. ||
 * 6.0 || 38 s. || 28 s. || 22 s. || 46 s. || 19 s. || 14 s. ||
 * 8.0 || 47 s. || 44 s. || 27.s || 1 min. || 30 s. || 41 s. ||

Analyze: 1. I could tell heat was being conducted since the wax along the bars was melting.

2.a) They all conducted, some slower than others, but they still conducted. b) Tin - Copper/Lead - Zinc - Aluminum - Carbon

Conclude and Apply: 1.


 * Reading Check, page 426**

1. Kinetic Molecular Theory- the theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions

2. Temperature- a measure of the average kinetic energy of all the particles in a sample of matter

3.Celsius, Fahrenheit, Kelvin


 * Reading Check, page 427**

1. Thermal energy

2.The higher the temperature, the more energy there is.

3. The amount of thermal energy that transfers from an area or object of higher temperature to an area/object of lower temperature


 * Reading Check, page 428**

1. Conduction

2. Higher temperature to lower temperature

3. Materials that transfer heat easily

4. Insulators

** December 1, 2009**
Chapter Review, # 20, Page 461

20. a) The albedo of a typical city would be much higher than that of a forested area. In the city, there are many surfaces that absorb heat but don't emit infrared radiation, resulting in the city keeping the heat within it's limits. In a forested area, there would be surfaces that absorb heat, of course, but most of those would emit the infrared radiation needed to keep the area cooler than a city.

b)The best choice to reduce albedo of a city plaza would be white rock as opposed to concrete or asphalt.

c)White rock should be used for the plaza because the other materials are those that absorb heat and emit the radiation that causes the atmosphere to heat up. White rock would absorb the heat