P1 Required practical's (will come up)

Question 1

Investigate the effectiveness of different materials as thermal insulators

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
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 the steps 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

Investigating factors that may affect the thermal insulation properties of a material.

Answer 2

1. Use the kettle to boil water and then put 200 ml of this hot water into a 250 ml beaker.
2. Use a piece of cardboard, with a hole for the thermometer, as a lid for the beaker.
3. Insert the thermometer through the hole in the cardboard lid so that its bulb is in the hot water.
4. Record the temperature of the water and start the stopwatch.
5. Record the temperature of the water every 5 minutes for 20 minutes.
6. Repeat steps 1 to 5, but this time insulate the beaker by wrapping one or more layers of
   insulating material around the beaker.

The insulating material may be held in place by using
rubber bands.

Make sure that you use the same volume of water each time.

Question 3

How to work out the density of a regularly shaped object

Answer 3

1. Measure the length, width and height of each of the objects using a ruler
2. Measure the mass of each object using a balance, and record the results.
3. Calculate and record the volumes (length x width x height).
4. Calculate and record the densities (mass ÷ volume)

Question 4

How to work out the density of an irregularly shaped object

Answer 4

Measure the mass of the object using a balance
Place a beaker under the spout of a eureka can
Fill an eureka can with water just above the spout so excess water drips out into the beaker
4. When the water has stopped dripping, 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. Collect all of the water that comes out of the spout in the
measuring cylinder.
6. Measure and record the volume of the collected water; this is equal to the volume of the
object.
7. Calculate and record the density of the object using density = mass/volume
8. Repeat for some of the other objects.
Remember to refill the can each time

Question 5

How to work out the density of a liquid

Answer 5

1. Pour about 100 ml of liquid into a measuring cylinder.
2. Measure and record the volume of the liquid
3. Measure the mass of an empty beaker using a balance
4. Pour the liquid into the beaker.
5. Measure and record the mass of the beaker and liquid.
6. Take away the mass of the beaker from the mass of the beaker and liquid to get the mass of the liquid
7. Calculate the density of the liquid using density = mass/volume