PHYSICAL PROPERTIES Chapter 3 2 IDENTIFYING PHYSICAL PROPERTIES

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PHYSICAL PROPERTIES Chapter 3 - 2

PHYSICAL PROPERTIES Chapter 3 - 2

IDENTIFYING PHYSICAL PROPERTIES • A physical property of matter can be observed or measured

IDENTIFYING PHYSICAL PROPERTIES • A physical property of matter can be observed or measured without changing the substance into a new substance. • Examples: color, texture, odor, magnetic or electrical conductivity, strength, and flexibility.

Examples of Physical Properties • Thermal conductivity: rate it transfers heat. • Ductility: ability

Examples of Physical Properties • Thermal conductivity: rate it transfers heat. • Ductility: ability to be pulled into a wire. • State: the physical form. • Malleability: can be pounded or rolled into shapes. • Solubility: will it dissolve into another substance. • Density: mass per unit of volume.

DENSITY • Density is the amount of matter in a given volume. • It

DENSITY • Density is the amount of matter in a given volume. • It is useful for identifying substances. • Density can tell you if an object will sink or float. • Liquids with different densities can form layers.

CHEMICAL PROPERTIES • Chemical properties describe a substance based on its ability to change

CHEMICAL PROPERTIES • Chemical properties describe a substance based on its ability to change into a new substance with different properties. • Examples include flammability, reactivity with acid, and reactivity with oxygen.

PHYSICAL CHANGES • A change that affects the physical properties of a substance is

PHYSICAL CHANGES • A change that affects the physical properties of a substance is a physical change. • No new substances are formed.

REVERSIBILITY • Because physical changes do not change the identity of a substance, they

REVERSIBILITY • Because physical changes do not change the identity of a substance, they are sometimes easy to undo. • Examples: cutting paper, boiling water, and melting gold.

THE END Chapter 3 - 2

THE END Chapter 3 - 2

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