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Do Now:

1) 5.2 x 10³ = _____________ Standard form?	4) 1000 mg = __________ g
2) 0.0043 = ______________	5) 160 cm = ___________ mm
3) 8.5 x 10^–2= _____________ Standard form?	6) 14 km = ____________ m

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is the amount of matter in a specific volume.
is measured in g/cm³ or g/mL
can be used to help identify an unknown substance

Today’s Objective:

What is Density?

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Density Formula

** Formula can be found on ESRT pg 1 **

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LAB #1 DENSITY

1. What is the density of on object with a mass of 120g and a volume of 7mL?

2. What is the volume of 22O grams of on object with a density of 55g/cm³ ?

Think- Solve- Share

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** Density of an object remains the same no

matter how many pieces it’s broken in to! **

* The density of an object DOES NOT

change if you change its mass!*

Therefore, we can find an object's density to help identify various materials.

Ex. The density of 20.0g of aluminum = 2.7 g/cm³

The density of 99.0g of aluminum = 2.7 g/cm³

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Temperature

Density

How Does Temperature Affect Density?

As temperature increases density decreases.

Increase Heat

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How Does Pressure Affect Density?

Pressure

Density

As pressure increases density increases.

Increase Pressure

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What is Buoyancy?

Buoyancy is the tendency of an

object to float in a liquid.

This explains why an object sinks or floats.

Less dense materials float

on more dense materials.

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Explain why the soldiers land where they do when they are placed into this beaker of water

Do Not Copy

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Practice Problems

1. What is the density of on object with a mass of 420g and a volume of 70mL?

2. What is the volume of 52O grams of on object with a density of 65g/cm³ ?

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3. A block of wood has a mass of 180 grams. It is 10.0cm long, 6.0cm wide, and 4.0cm thick. What is its volume and density?

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Now Try These . . .

Solve the following (don’t forget units):

M= 34.1g

V= 78.5 mL

M= 27 g

D= .76 g/cm³

Density = ____________

Volume = ____________

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V= 25 mL

D= 2.5 g/L

Mass = ____________

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Example: Compare the density of H₂O (water) to the density of an ice cube.

THINK – If an ice cube floats in H₂O because it has a density:

a) Equal to the density of water

b) Greater than the density of water

c) Less than the density of water

d) None of the above

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THINK:

Why does a steel ship float in water?

Densities in grams / cm3

D (water) = 1.0 g / cm3

D (wood) = 0.8 g / cm3

D (steel) = 7.8 g / cm3

D (lead) 11.3 g / cm3

D (air) .0012 g / cm3

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Accepted Values

Densities in grams / cm3

D (Aluminum) = 2.71 g / cm3

D (steel) = 7.86 g / cm3

D (Copper) 8.96 g / cm3

D (Brass) 8.73g / cm3

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Answer:

A ship has a steel shell that is hollow inside. The volume is mostly air. The ship and air together have a density less than water.

Density Worksheet