Grab binders, handouts & Returned Work Begin the Do Now What is a phase change? What 2 phase changes did we observe during the Phase Changes Lab? Describe what you think happens to the particle motion of a solid as it melts to form a liquid?

Recap 6 Types of Phase Changes (s)  (l) = melting (l)  (s) = freezing (l)  (g) = evaporation (boiling) (g)  (l) = condensation (s)  (g) = sublimation (g)  (s) = deposition - Phase Change Lab (Heat Curves)

Heat Curves *Track temperature change during phase changes

Energy & Phase Changes: Key Point #1 Key Point 1: Temperature (T)= the measurement of the Kinetic Energy of a substance *Adding heat increases the KE thus increases the temperature

Key Point #2 Key Point 2: - As temperature increases the particles’ energy increases As temperature decreases, what happens to the particles’ energy? What happens to particle motion as energy increases? When energy decreases?

While you watch… Jot down what you observe happening to the particle motion… - What is the particle motion initially? - What is happening to the particle motion as the temperature changes? When the particles changed phase, notice how the temperature remained constant

Key Point #3 Key Point 3: - During phase changes, the energy is used to change the phase - NO change in energy - NO temperature change

Key Point #4 Key Point 1: - Heat increases the Kinetic Energy of the particles - Once the particles have enough energy, they use that energy to change phase - The energy is used to break any bonds or attractive forces between particles

Heat Curves *Track temperature change during phase changes

Phase Diagrams

BOOM! Person to the left of whoever is picking out a question holds the bag and the answer key Have only 30 sec to answer the question Keep questions you get correct (worth 1 point each) Return questions you get incorrect or don’t know back in the BOOM! Bag If you draw a BOOM! card you must return all of your questions PLUS the BOOM! card back to the bag Person with most questions (points) left after 10 minutes wins!

Exit Ticket #5 Complete Exit Ticket 5 to the best of your abilities on your own & without notes.

Phase Diagrams *Track Pressure & Temperature change during phase changes

Phase Diagrams *Track Pressure & Temperature change during phase changes