CHEMICAL INTERACTIONS INVESTIGATION 7: PHASE CHANGE.

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Presentation transcript:

CHEMICAL INTERACTIONS INVESTIGATION 7: PHASE CHANGE

KEY CONCEPTS MATTER EXISTS ON EARTH IN 3 COMMON PHASES (STATES): SOLID, LIQUID, AND GAS. MELTING IS A CHANGE OF STATE CAUSED BY HEAT. DISSOLVING IS AN INTERACITON BETWEEN 2 SUBSTANCES IN WHICH 2 SUBSTANCE BREAKS APART AND GOES INTO ANOTHER SUBSTANCE.

KEY CONCEPTS MELTING IS A CHANGE OF STATE CAUSED BY HEAT. IN SOLIDS, PARTICLES ARE HELD IN PLACE AND MOVE ONLY BY VIBRATING. IN LIQUIDS, PARTICLES ARE HELD CLOSE, BUT ARE ABLE TO MOVE AROUND AND OVER ONE ANOTHER.

KEY CONCEPTS CHANGE OF STATE IS THE RESULT OF CHANGE OF ENERGY IN THE PARTICLES IN A SAMPLE OF MATTER. AS HEAT IS TRANSFERRED, KINETIC ENERGY INCREASES, MOVING PARTICLES MORE.

KEY CONCEPTS MELTING IS A CHANGE OF STATE CAUSED BY HEAT. CHANGE OF STATE IS DUE TO A CHANGE OF ENERGY IN THE PARTICLES OF MATTER DURING PHASE CHANGE, PARTICLES DO NOT CHANGE; RELATIONSHIPS BETWEEN PARTICLES DO CHANGE. THE TEMPERATURES AT WHICH PHASE CHANGES OCCUR ARE DIFFERENT FOR DIFFERENT SUBSTANCES

KEY CONCEPTS CHANGE OF STATE IS THE RESLUT OF CHANGE OF ENERGY IN PARTICLES THE PROCESSES OF PHASE CHANGE ARE EVAPORATION, CONDENSATION, MELTING, FREEZING, SUBLIMATION AND DEPOSITION.

KEY CONCEPT SUBLIMATION = SOLID  GAS LIKE DRY ICE GOING TO VAPOR. DEPOSITION = GAS  SOLID LIKE FROST FORMING. -HEAT OF FUSION = ENERGY NEEDED TO MELT SOMETHING. DURING PHASE CHANGE, PARTICLES DO NOT CHANGE; RELATIONSHIPS BETWEEN PARTICLES DO CHANGE. KINETIC ENERGY TRANSFERS, EVENTUALLY CHANGING THE STATE OF THE PARTICLES.