1.1 (i)
Contents
Demonstration 1
Finding the density of air. Using a crop sprayer, pump it up to increase the pressure; use a balance to find the mass of the crop sprayer. Release the compressed air in the crop spryer through a beehive into a water filled measuring cylinder. Measure the new mass of the crop sprayer.
Resources
Analysis
Use p=m/V to find the density.
Equipment
1x crop sprayer, 1x beehive, 1x pipes, 1x large measuring cylinder, 1x large water basin & scales
Safety
pressurised container, do not over pressurise.
Demonstration 2
Finding the density of air. A reinforces spherical glass flask is used, it's mass found. Evacuate on a set of scales to find the evacuated mass. Let water into the evacuated flask.
Resources
Analysis
Find the mass by taking the difference in mass when it is open to the atmosphere and when it has been evacuated. When water is let in and the p;ressures have equalised, pour the water into measuring cylinders to find the volume of the air displaced. Use p=m/V to find the desity.
Equipment
1x spherical glass flask, 1x vacuum pump, 1x large basin of water, 1x large measuring cylinder, 1x scales
Safety
Evacuated glass container - perform behind safety screen. Check for cracks in vessel before starting. Everyone in the room to wear goggles.
Class Experiment 1
An investiagtion into the desity of a solid.
Resources
Analysis
Equipment
Safety
Class Experiment 2
An investiagtion into the desity of a solid.
Resources
Analysis
Equipment
Safety
Class Experiment 3
An investiagtion into the desity of a solid.
Resources
Analysis
Equipment
Safety
Class Experiment 4
Finding the density of a regular solid (there is a box of different types materials).
Resources
Uncertainty of density calculations, Finding the density of a ball bearing using a metre rule, Finding the density of a ball bearing using a displacement can
Analysis
Calculating the density of different solids. Then doing a full uncertainty analysis of the measurements (example of calculations in the above ppp). Remember to rotate the solid when taking repeat measurements.
Equipment
Vernier Calipers, scales, blocks of different materials.
