Practicals

Question 1

Thermal insulation

Answer 1

1. Use the kettle to boil water and then put 80 ml of this hot water into a 100 ml beaker.
2. Place the small 100 ml beaker inside the large beaker
3. Use a piece of cardboard, with a hole for the thermometer, as a lid for the large beaker.
4. Insert the thermometer through the hole in the cardboard lid so that its bulb is in the hot water.
5. Record the temperature of the water and start the stopwatch.
6. Record the temperature of the water every 5 minutes for 20 minutes.
7. Repeat steps 1 to 6, but this time fill the space between the small and the large beaker with an
   insulating material. Make sure that you use the same volume of water each time.

Question 2

Density

Answer 2

1. Measure the mass of one of the irregular shaped objects using a top pan balance
2. Work out the average and record your result in a table
3. Place a displacement can on smooth surface. Put an empty beaker under the spout and fill the can to the top with water
4. When water has stopped dripping out the spout, place a measuring cylinder under the spout.
5. Tie the object to a piece of cotton and very carefully lower it into the displacement can so that it is completely submerged.
6. Collect all of the water that comes out of the spout in the measuring cylinder.
7. Measure and record the volume of the collected water(this is equal to the volume of the
   object)
8. Calculate and record the density of the object.(m/v)
9. Repeat for some of the other objects. Remember to refill the can each time