Phase Changes and Heating Curve of Water

Temperature Temperature – the measure of particles moving Higher temperature = Fast moving particles Lower temperature = Slow moving particles

Thermal Energy Thermal Energy – TOTAL energy of all particles (KE + PE) ALL matter has thermal energy

Heat Heat – the amount of thermal energy that is transferred to an object or area EX: Cooking an egg (Hot stove  frying pan  egg

States of Matter 4 States of Matter Solid Liquid Gas Plasma

Phase Properties Phase Atoms Packed Energy Solid Closest Little Liquid Moderate Gas Far A Lot

Phase Changes As heat is added or taken, matter can change its state or phase

Phase Changes Changes States Involved Melting Solid → Liquid Freezing Liquid → Solid Vaporization Liquid → Gas Condensation Gas → Liquid Sublimation Solid → Gas Deposition Gas → Solid

Phase Changes

Heat Transmission Review Endothermic – Heat goes INTO an object or reaction. Example: Vinegar and Baking Soda is a chemical reaction that gets COLDER when mixed. Heat In. Exothermic – Heat is RELEASED from an object or reaction. Example: A Combustion Reaction is heat being released from a chemical reaction; Flaming Bubbles! Heat Out.

Heating Curve of Water Water is matter that can go through ALL the different phase changes

Heating Curve of Water There is NO temperature change during a Change of Phase!

What is the phase change called from B to C? Which letters represent a gas? What is the phase change called from D to E? Which letters represent a solid? What is the phase change called from E to D? What is the phase change called from C to B? What is the temperature change when a phase change occurs?

What is the phase change called from B to C? melting Which letters represent a gas? E- F What is the phase change called from D to E? Boiling Which letters represent a solid? A-B What is the phase change called from E to D? Condensation What is the phase change called from C to B? Freezing What is the temperature change when a phase change occurs? There is no change