Physical and Chemical Changes and Properties

(C.4ABD)

Physical Change

A physical change to matter will not alter the composition or identity of a substance. A chemical change to matter will always result in the formation of a new substance.

Chemical Change

A chemical change to matter will always result in the formation of a new substance.

Precipitation Gas Formation Color Change Temperature Change

Physical Properties

The physical properties of matter include properties that describe the substance, such as color, smell, boiling point, density or others.

Chemical Properties

Solubility Explosion Specific Heat

Extensive Property

Extensive properties are properties of matter that are dependent on the amount of a substance present, such as mass, number of particles, or energy. Mass - A measurement of the amount of matter in a object

(grams). Weight - A measurement of the gravitational force of

attraction of the earth acting on an object. Volume - A measurement of the amount of space a

substance occupies. Length

Intensive Property Intensive properties are physical properties of matter that are not

dependent on the amount of a substance present such as density, ductility, and boiling point. Color Odor 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. Conductivity - The ability of a substance to allow the flow of

energy or electricity. 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 at atmospheric pressure.

Boiling Point - The temperature at which the vapor pressure of a liquid is equal to the pressure on the liquid (generally atmospheric pressure).

Density - The mass of a substance divided by its volume

All matter on Earth can be classified as either a pure substance or a mixture.

Pure Substance

A pure substance consists of a single substance with its own definite composition and properties.

Mixture

A mixture consists of a combination of two or more pure substances with variable composition and properties.

Questions

What are the differences between physical and chemical changes?

What are the differences between physical and chemical properties?

What are the differences between extensive properties and intensive properties?

What distinguishes a pure substance from a mixture?

Chemical or Physical Together

Odor Burning Taste Flammability Ability to Rust Ability to Tarnish Hardness Texture Color

As A Group

Number of Protons Melting Point Number of Electrons Boiling Point State of Matter Specific Heat Transparency Ability to react with Acid

Alone

Density Atomic Number Alters the substance Does not alter the substance Chemical Formula Solubility Atomic Mass

Give Your Own Definition

Physical Property:

Chemical Property:

2 Which of the following is an example of a chemical change?

A Ice cracking B Sugar dissolving C Milk souring D Lead melting

5 Which of these changes in rocks is a physical change?

A Acid rain damaging marbleB Iron in rock combining with oxygen to form hematiteC Carbonic acid weathering limestoneD An ice wedge shattering a slab of shale