RP5 Density PCE.pptx

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• Upper Secondary (Key Stage 4)
• GCSE

Wednesday, 13 February 2019

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RP5: Density

Physics Required Practical 5: Density

• Calculating Densities

• Measure the mass and volume of objects and liquids and calculate their densities using the density equation

How do you find volume from density?

A

volume = density + mass

B

volume = density * mass

C

volume = mass - density

D

volume = mass / density

Density of a regular solid
(in the shape of a cube or cuboid)

• 1 In your table for solids, write the material from which the solid is made.

• 2 Measure and record the mass of the solid.

• 3 Measure and record the length, width, and height of the solid.

Density of an irregular solid

• 1 Measure and record the mass of the sample using an electronic balance.

• 2 Fill a measuring cylinder half-full with water. (There needs to be enough water so that when you put the solid into the water, the water will cover the solid but will not rise above the top of the measuring scale.)

• 3 With your eye level with the water’s surface, measure the volume of water and record it.

• 4 Carefully place the solid material into the container.

• 5 Measure and record the new volume of the water.

3 Methods

• Regular (solid) object

  • Measure mass (g). Measure volume (base(cm) x height(cm) x depth(cm))

  • Calculate density (g/cm3)

• Irregular (solid) object

  • Measure mass (g)

  • Half fill a measuring cylinder, note the volume (cm3). Add the object and measure the new volume (cm3). The difference between the two is the volume of the object

  • (Alternative method: Eureka can)

  • Calculate density (g/cm3)

• Liquid

  • Put known volume of water in measuring cylinder (volume, cm3)

  • Measure mass (g)

  • Calculate density (g/cm3)

Density of a regular solid
(in the shape of a cube or cuboid)

• 1 Find the mass of the object by placing it on an electronic balance

• 2 Record the mass of the solid (in grams)

• 3 Measure and record the length (in cm), width (in cm), and height (in cm)of the solid.

• 4 Find the volume using: Vol = l x w x h

• 5 Calculate the density of the object using:

Density of an irregular solid (method 1)

• 1 Measure and record the mass (in grams) of the sample using an electronic balance.

• 2 Fill a measuring cylinder half-full with water. (There needs to be enough water so that when you put the solid into the water, the water will cover the solid but will not rise above the top of the measuring scale.)

• 3 With your eye level with the water’s surface, measure the volume of water and record it.

• 4 Carefully place the solid material into the container.

• 5 Measure and record the new volume of the water (in cm3)

• 6 Calculate the density using:

Density of an irregular solid (method 2)

• 1 Measure and record the mass (in grams) of the sample using an electronic balance.

• 2 Completely fill a displacement can (‘Eureka can’) with water and allow it to overflow.

• 3 Position a measuring cylinder under the spout of the Eureka can.

• 4 Carefully place the irregular object into the Eureka can, and wait until no more water drips out.

• 5 Measure and record the volume of the water (in cm3) displaced into the measuring cylinder (this is the same volume as the object).

• 6 Calculate the density using:

Density of a liquid

• 1 Place an empty measuring cylinder on an electronic balance.

• 2 Press ‘Zero’ on the electronic balance

• 3 Pour the liquid into the measuring cylinder, making sure it does not go above the top of the cylinder’s measuring scale.

• 4 Measure and record the mass (in grams) of the liquid by reading the display of the electronic balance

• 5 Measure and record the volume of liquid in the cylinder by reading off the scale on the measuring cylinder

Density of a liquid

• 1 In your table for liquids, write the type of liquid whose density you are measuring.

• 2 Measure and record the mass of an empty measuring cylinder.

• 3 Pour the liquid into the measuring cylinder, making sure it does not go above the top of the cylinder’s measuring scale.

• 4 Measure and record the mass of the cylinder with the liquid in it.

• 5 Measure and record the volume of liquid in the cylinder.

RP Exam Q

Exam Q

3 Methods

• Regular (solid) object

  • Measure mass (g). Measure volume (base(cm) x height(cm) x depth(cm))

  • Calculate density (g/cm3)

• Irregular (solid) object

  • Measure mass (g)

  • Half fill a measuring cylinder, note the volume (cm3). Add the object and measure the new volume (cm3). The difference between the two is the volume of the object

  • (Alternative method: Eureka can)

  • Calculate density (g/cm3)

• Liquid

  • Put known volume of water in measuring cylinder (volume, cm3)

  • Measure mass (g)

  • Calculate density (g/cm3)

Density of a regular solid
(in the shape of a cube or cuboid)

• 1 Find the mass of the object by placing it on an electronic balance

• 2 Record the mass of the solid (in grams)

• 3 Measure and record the length (in cm), width (in cm), and height (in cm)of the solid.

• 4 Find the volume using: Vol = l x w x h

• 5 Calculate the density of the object using:

Density of an irregular solid (method 1)

• 1 Measure and record the mass (in grams) of the sample using an electronic balance.

• 2 Fill a measuring cylinder half-full with water. (There needs to be enough water so that when you put the solid into the water, the water will cover the solid but will not rise above the top of the measuring scale.)

• 3 With your eye level with the water’s surface, measure the volume of water and record it.

• 4 Carefully place the solid material into the container.

• 5 Measure and record the new volume of the water (in cm3)

• 6 Calculate the density using:

Density of an irregular solid (method 2)

• 1 Measure and record the mass (in grams) of the sample using an electronic balance.

• 2 Completely fill a displacement can (‘Eureka can’) with water and allow it to overflow.

• 3 Position a measuring cylinder under the spout of the Eureka can.

• 4 Carefully place the irregular object into the Eureka can, and wait until no more water drips out.

• 5 Measure and record the volume of the water (in cm3) displaced into the measuring cylinder (this is the same volume as the object).

• 6 Calculate the density using:

Density of a liquid

• 1 Place an empty measuring cylinder on an electronic balance.

• 2 Press ‘Zero’ on the electronic balance

• 3 Pour the liquid into the measuring cylinder, making sure it does not go above the top of the cylinder’s measuring scale.

• 4 Measure and record the mass (in grams) of the liquid by reading the display of the electronic balance

• 5 Measure and record the volume of liquid in the cylinder by reading off the scale on the measuring cylinder

Worksheet - density