physical and chemical changes and properties (c.4abd)
Post on 16-Dec-2015
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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.
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
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
2 Which of the following is an example of a chemical change?
A Ice cracking B Sugar dissolving C Milk souring D Lead melting
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