You Will Now Calculate the Densities of the 3 Cubes. Remember D = M

Name: Date:

DENSITY CONTINUED…

You will now calculate the densities of the 3 cubes. Remember D = m

VOLUME OF SOLID OBJECTS: there are 2 ways to calculate the Volume (V) of solid objects

A. Method 1: length x width x height

Using a ruler, carefully measure the dimensions of each cube. Record your findings in the table below. Measure the dimensions in centimeters (cm).
In order to find volume, multiply length(l) by width (w) by height (h)
Find the mass of the 3 cubes using the scales provided. Measure the mass in grams (g).
In order to calculate density, divide the mass by the volume. Include units!

Don’t forget to include units!

Cube 1 / Cube 2 / Cube 3
Length (l)
Width (w)
Height (h)
Volume (V) (l x w x h)
Mass (m)
Density (m/V)

Was your original prediction correct? .

What are some limitations of using this method?

B. Method 2: ‘Displacement Method’

Measure 10mL of water into a graduated cylinder
Place each cube in the water and measure how much water is ‘displaced’ by each using the following formula: Vfinal – Vinitial = Vobject
Complete the table below

Don’t forget to include units!

Cube 1 / Cube 2 / Cube 3
Volume (V)
Mass (m)
Density (m/V)

Based on your findings, what units can be used to represent the density of objects?

What conclusion can you draw about the solid equivalent of a mL?

MASS vs. WEIGHT

Recall that mass is the amount of matter in an object/sample.

Listen to the Rap on Density, Weight and Mass and complete the following sentences

Weight is

Density is

Volume of a Sphere equals

DENSITY OF LIQUIDS

Observe the bottle of salad dressing. In your own words, explain why you think the fluids are in different layers:

Immiscibility is

Fluids that are dense will on fluids that are dense.

Let’s observe this by doing an activity!

Instructions:

Measure the density of water: pour 100mL of water into a graduated cylinder. Place the plastic cup on the scale and zero the balance. Pour the water into the cup and measure the water’s mass. Use the m and V to calculate the density of water: (check your answer with the teacher)
Measure exactly 100mL of a liquid using a graduated cylinder and, using the same technique as in step 1, find the mass of each. Record your observations on sheet provided.
Pour 10mL of the liquid back into the graduated cylinder and add it to your glass column.
Repeat steps 2 and 3 for each liquid provided.
In order to find the density (g/mL) of each liquid divide the mass by 100mL. Record calculations on the observation sheet
Complete the diagram of the glass cylinder by using coloured pencils to show the layering effect. Remember to label your diagram and include the density of each liquid!
Using a piece of graph paper, plot the densities on a bar graph (this will be handed in for a mark)

Follow up questions (copy and answer the questions in your green book):

If a solid object has a mass of 25.1g and a volume of 27cm3 calculate it’s density: