Experiments on density

DENSITY

Activity

Investigation : Determining the density of liquids: Density is a very important property because it helps us to identify diﬀerent materials. Every material, depending on the elements that make it up, and the arrangement of its atoms, will have a diﬀerent density. The equation for density is:

Density = Mass/Volume

Apparatus: Laboratory mass balance, 10 ml and 100 ml graduated cylinders, thread, distilled water, two diﬀerent liquids.

Method: Determine the density of the distilled water and two liquids as follows:

• Measure and record the mass of a 10 ml graduated cyclinder.
• Pour an amount of distilled water into the cylinder.
• Measure and record the combined mass of the water and cylinder.
• Record the volume of distilled water in the cylinder.
• Empty, clean and dry the graduated cylinder.
• Repeat the above steps for the other two liquids you have.

Write your conclusion in tabular form

Density of irregular solids

Investigation : Determining the density of irregular solids:

Apparatus: Laboratory mass balance, 10 ml and 100 ml graduated cylinders, thread, distilled water, two diﬀerent solids

Method: Determine the density of irregular solids as follows:

• Measure and record the mass of one of the irregular solids.
• Tie a piece of thread around the solid.
• Pour some water into a 100 ml graduated cylinder and record the volume.
• Gently lower the solid into the water, keeping hold of the thread. Record the combined volume of the solid and the water.
• Determine the volume of the solid by subtracting the combined volume from the original volume of the water only. 6. Repeat these steps for the second object.

Write your conclusion in tabular form