Physical & Chemical Changes

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Presentation transcript:

Physical & Chemical Changes 7-5.10

Physical Changes Chemical Changes Do NOT change the composition of a substance, only the physical properties No new matter is formed Forms 1 or more new substances with new chemical and physical properties New matter is formed

Physical Changes Changes in the state of matter Change in size or shape

Change in the state of matter 3 states of matter: solid, liquid, gas Melting Solid to a liquid Freezing Liquid to Solid Evaporating Liquid to Gas Condensation Gas to Liquid Sublimation Solid to gas OR gas to solid

Change in size or shape Cutting Tearing Stretching Wrinkling Dissolving

Chemical Changes Change in color Change in temperature Formation of a precipitate Formation of a gas

Change in color Apple turning brown Iron rusting Clothes when bleached Marshmallows turning black when burned

Change in temperature When substances combine and temperature increases or decreases Ex: Wood burns to ash or gases & temperature increases

Formation of a precipitate When solutions (liquids) are combined, they form a solid substance (precipitate)

Formation of a Gas When solid or liquid substances combine, they may form gas bubbles Ex: Baking soda & vinegar Alka seltzer & water

Review When NEW matter is formed Dissolving Sublimation Change in color Ice melting Wood burning Gases being formed Precipitate

STUDY GUIDE Physical properties Chemical properties Physical changes Chemical changes Sublimation Precipitate Atoms Compounds Balanced/unbalanced Acid Base Density Metal Nonmetal Reactant Product Yield/make Periods Family/Group Subscripts coefficients