Hello Chemistry Students:

• Pick up your notebooks and take our your laptops.

Properties of Matter

C.4.A: Chemical and Physical PropertiesC.4.B: Intensive versus Extensive

Properties of Matter

Matter is anything that has mass and volume.

Properties are characteristics that enable us to distinguish one kind of matter from another.

Physical Properties A physical property is a characteristic of a substance

that can be observed or measured without changing the identity of the substance.

Examples : Odor Color Density - The mass of a substance divided by its

volume Luster - How shiny a substance is. Malleability - The ability of a substance to be beaten

into thin sheets. Ductility - The ability of a substance to be drawn into

thin wires.

Hardness - How easily a substance can be scratched.

Melting/Freezing Point - The temperature at which the solid and liquid phases of a substance are in equilibrium.

Boiling Point - The temperature at which the vapor pressure of a liquid is equal to the pressure on the liquid

Conductivity - The ability of a substance to allow the flow of energy or electricity.

More examples of physical properties

Chemical Properties

Chemical property describes the ability of a substance to combine with or change into one or more other substances.

Examples:Reactivity – The ability of a substance to

undergo a chemical reaction Ionization – The ability of a substance to

exhibit a positive or negative charge.Combustibility – The ability for a

substance to burn

Let classify some!

Identify the following as an example of a physical or chemical property1. Helium does not react with any other

element. Chemical property

2. Diamond dust can be used to cut or grind most other materials

Physical Property3. Potassium metal is kept submerged in oil

to prevent contact with oxygen or water. Chemical Property

Let’s think about?

Two cheese cubes of the same cheese type, on is large.

What properties do these cheese cube have in common? What would be different?

Intensive Properties

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount.

Examples of intensive properties▪ Temperature▪ Color▪ Hardness▪ melting point▪ boiling point▪ pressure▪ density

Extensive Properties

An extensive property is a property that depends on the amount of matter in a sample.

Examples of extensive properties▪ Mass▪ Volume▪ Length

Lets Look @ the properties of “gold” and see if our pennies are real?

GOLD Gold is a soft metal Gold is both malleable and ductile. Gold is a heavy metal (density 19.3

g cm-3) Melting point of 1947.52 °F