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Ch 18 Section 2 Properties of Matter Physical Properties Characteristic of a material that you can observe without changing the identity of the substances that make up the material. Ex: color, shape, size, density, melting point, and boiling point. Behavior Attraction to a magnet is a physical property of the substance iron. The way substances behave in different situations can help classify a substance. Using physical properties to separate Separate into size Separate into the how substance reacts to situations. Ex: does the substance react to a magnet. Physical change A change in size, shape, or state of matter. A physical change does not change the substance itself Distillation The process for separating substances in a mixture by evaporating a liquid and recondensing its vapor. Chemical property A characteristic of a substance that indicates whether it can undergo a certain chemical change. Chemical Change A change of one substance to another. Ex: Burning and rusting are chemical changes. Determination of Chemical Reaction Clues such as heat, cooling, or the formation of bubbles or solids in a liquid are helpful indicators that a reaction is taking place. However, the only sure proof is that a new substance is produced. Using Chemical Change to Separate Many metals are separated from their ores and then purified using chemical changes. Weathering of the earth Chemical and physical change: Physical- rocks splitting, sand dunes shifting, water forming canyons. Chemical- acid rain changing the rock into new substances. Law of conservation of Mass The mass of all substances that are present before a chemical change equals the mass of all the substances that remain after the change. What happens when log is burned?