What is plasma? What is required for a gas to become a plasma?

PHASE CHANGES: Matter has the ability to move from one phase to another.

WATERWATER

SOLID: Ice LIQUID: Water GAS: Water Vapor

HEAT ENERGY HEAT ENERGY needs to be added or removed to change the phase of matter

Solid Gas

PHASE CHANGES Phase changes are REVERSIBLE physical changes that occur when a substance changes from one phase of matter to another.

What form is Blistex in? Is Blistex a solid, liquid, or a gas? A. SOLID B. LIQUID C. GAS

What does this mean??

MELTING When a substance changes from a solid to liquid. Example: an ice cube turning into water when taken out of the freezer. Heat needs to be added for this phase change (heat IN/ADDED). Atoms start Atoms end solidliquid

Snowmaking?! How do ski resorts make snow?! –Discuss this with your neighbor

FREEZING When a substance changes from a liquid to solid. Example: water turning into ice when placed in the freezer. Heat needs to be removed for this phase change (heat OUT/REMOVED). Atoms start Atoms end liquidsolid

BOILING/EVAPORATION When a substance changes from a liquid to gas. Example: water heated on the stove turning into water vapor. Boiling happens throughout the liquid. Evaporation is only at the surface. Heat needs to be added for this phase change (heat IN/ADDED). Atoms start Atoms end liquidgas Evaporation at top Boiling throughout

CONDENSATION When a substance changes from a gas to liquid. Example: water droplets forming on the cooler mirror during a hot shower. Heat needs to be removed for this phase change (heat OUT/REMOVED). Atoms start Atoms end gasliquid

Critical Thinking Question Mr. Albano just took a hot shower. He is in a HUGE RUSH to get to school because he woke up late. Mr. A’s hair has to be perfect before he leaves, but his bathroom mirror is completely fogged up!! What can he do to clear the mirror?!

SUBLIMATION When a substance changes from a solid to gas (SKIPS LIQUID STEP!). Example: Dry ice (solid CO 2 ) changing back to a “fog” (gas CO 2 ). Heat needs to be added for this phase change (heat IN/ADDED). Atoms start Atoms end solidgas

DEPOSITION When a substance changes from a gas to solid (SKIPS LIQUID STEP!). Example: when frost forms on a window (water vapor comes in contact with cold window). Heat needs to be removed for this phase change (heat OUT/REMOVED). Atoms start Atoms end gassolid

What ’ s the Matter? Plasma Grapes! Bill Nye (first 3:14) They Might Be Giants Preventing Frog-sicles