Topic: Describing Matter

• Matter

• Describing Matter– Composition

– Properties

• Anything that has mass and takes up space.

• Chemical makeup –– Water = H20

– Sugar = C6H12O6

• Physical and chemical properties

• Physical Properties

– Extensive – those that change with the size of the sample

– Intensive - those that remain the same regardless of the size of the sample.

- A characteristic of a substance that can be observed or measured without changing the substance.

- Color _________- Shape _________- Volume _________- Density __________- Texture __________- Melting point ________- Boiling point ________

- Generally things we can measure or see with our senses.

• Chemical Property

• Chemical properties are intensive

• A property that describes how a substance changes into a new substance

– Flammability– Reactivity

• Processes that involve a chemical propetyBurning

Rusting

Rotting

Baking

Back to Physical Properties

- A characteristic of a substance that can be observed or measured without changing the substance.

- color- smell- shape- volume- density- texture- melting point- boiling point

Density of Some Common Substances

Topic: Density

1. Definition of density

2. Most commonly used metric units for density

• The amount of mass in a given volume of a substance– Mass in grams – Volume in cm3

g or g

cm3 ml

solids liquids

Calculating Density

• To determine the density of a material you must find its volume and mass.

Density = Mass ÷ Volume

Here is a problem

What is the density of a cube with a volume of 12cm3 and a mass of 6.0 g?

What is the density of a cube with a volume of 12cm3 and a mass of 6.0 g?

Density = mass/volume

Density = 6.0g /12 cm3

Density = 0.5 g/cm3

0.5

12 6.0

Why is the unit g/cm3?

Because you divided mass (g) by volume (cm3)

V= 12cm3 M=6.0g