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V = l × w × h

If the cube has a

Height of 2cm

Length of 2cm

Width of 2 cm

What is it’s volume?

8 cm3

Same Space Different amount of items

The formula for density is

Density = Mass/Volume

The particle theory states that the particles of a substance spread out as they gain energy when heated.

(i) drying of wood (seasoning of wood)

(ii) hot air balloons

(iii) salt water being easier to float in

Define Mass

Define Volume

Define Density

Mass is the amount of matter in a substance

Volume is a measurement of the amount of space occupied by the substance.

Chapter 8 Density

Official 1 kilogram mass

Define Density

Relationship between mass, volume and density

Practice Problems

Density is the amount of mass in a certain unit volume of a substance.

1. A piece of metal has a mass of 8.1 g and a volume of 3.0 cm3. What is the density of the metal? Look at the densities of the solids in Table 8.1. What type of metal do you think was described in this problem?

Find the density of a 10 g mass of a substance that has a

volume of 2.0 cm3.

• Write the formula for density. D = m/V

• In place of m for mass, write 10 g. D = 10 g/V

• In place of V for volume, write 2.0 cm3.

D = 10 g/2.0 cm3

• Carry out the division.

That is, divide 10 by 2.0. D = 5.0 g/cm3

Density Chapter 8

Relationship between the states of matter and density:

The effect of temperature on the three states of matter.

3. You collect 1000 mL of a gas in a balloon. If the gas in the balloon has a mass of 2.0 g, what is the density of the gas? Use Table 8.1 to identify the gas.

2. Imagine that you poured a liquid into a measuring spoon that holds 2.5 mL. When you measured the mass of the liquid, you discovered that its mass was 3.15 g. What is the density of the liquid? Was this liquid water? Explain how you could check if the liquid was water.

Examples of density changes in everyday life.

The density of substances naturally changes or Can be intentionally changed.

(i) hot air balloons

(ii) warm vs. cool tire pressure

(iii) water in its three states

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