Do Now Homework: water cycle worksheet

Phase Changes Day 1 What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

Standard/ Objective Standard: PS 3.1c The motion of particles helps to explain the phases/states of matter as well as changes from one phase to another.  The phase in which matter exists depends on the attractive forces among its particles. Objective: SWBAT describe and list the changes that occur between the liquid and gas states.

Flow of the Day Do Now 5 min Notes 8 min Guided practice 8 min Independent practice 8 min Journal 8 min Exit Slip 5 min

Characteristics of Phase Changes States of matter are also referred to as phases. Phase Change: the reversible physical change that occurs when a substance changes from one state of matter to another

Description of Phase Change PHASE CHANGES Description of Phase Change Term for Phase Change Heat Movement During Phase Change Solid to liquid Melting Heat goes into the solid as it melts. Liquid to solid Freezing Heat leaves the liquid as it freezes.

Description of Phase Change PHASE CHANGES Description of Phase Change Term for Phase Change Heat Movement During Phase Change Liquid to gas Vaporization, which includes boiling and evaporation Heat goes into the liquid as it vaporizes. Gas to liquid Condensation Heat leaves the gas as it condenses.

Description of Phase Change Term for Phase Change Heat Movement During Phase Change Solid to Gas Sublimation Heat goes into the solid as it sublimates. Gas to solid Deposition Heat leaves the gas as it deposits.

Guided Practice Fill out the diagram on your worksheet using the notes we just took. We will go over the answers as a class when you have finished.

Phase Change graphic Deposition Condensation Sublimation Vaporization Freezing Melting

Independent Practice Make flashcards for each phase change On one side of the card: Write the name of the phase change (i.e. deposition) On the other side of the card: Write the definition of the word Draw a picture that helps you remember the word

Journal What did you learn today? Why is it important?

Exit Slip Hat What is the phase change from solid to liquid called? What is the phase change from a liquid to a solid called?

Do Now Homework: States of matter worksheet

Phase Changes Day 2 What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

Standard/ Objective Standard: PS 3.1c The motion of particles helps to explain the phases/states of matter as well as changes from one phase to another.  The phase in which matter exists depends on the attractive forces among its particles. Objective: SWBAT explain that the motion of particles is the reason that matter can change from one phase to another

ENERGY AND CHANGES OF STATE The energy of a substance is related to the motion of its particles. If energy is ADDED to a substance its particles move faster. If energy is REMOVED, its particles move slower.

The temperature of a substance is a measure of the speed of its particles and therefore is a measure of its energy. Steam has a higher temperature than liquid water, so particles in steam have more energy. Solid to Liquid - the particles in the liquid have ______________________________________ Steam to a liquid - the particles in the liquid have ______________________________________ Liquid to a solid - the particles in the solid have ______________________________________ More energy than the particles in the solid Less energy than the particles in the gas Less energy than the particles in the liquid

Endothermic vs. Exothermic If energy is being added then the molecules are absorbing energy. This is called an ENDOTHERMIC PROCESS. If energy is being taken away then the molecules are losing energy. This is an EXOTHERMIC PROCESS.

Which are endothermic and which are exothemic? Liquid to a solid - freezing Gas to a liquid -condensation Solid to a liquid - melting Solid to a gas – sublimation Liquid to a gas - vaporization

Endothermic Exothermic

Journal Why is energy important in phase changes? Use the words for endothermic and exothermic in your answer.

Exit Slip Standard

Do Now Make a list and draw a picture of the six simple machines! Homework: Oobleck packet: Writing about physical properties. If you don’t have the packet, this is the assignment: Describe what your favorite food is to someone without telling them what it is (use words that have to do with the five senses-sight, touch, hearing, smell and taste). Study for Quiz Friday

Phase Changes Day 3 What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

Standard/ Objective Standard: PS 4.2c - During a phase change, heat energy is absorbed or released. Energy is absorbed when a solid changes to a liquid and when a liquid changes to a gas. Energy is released when a gas changes to a liquid and when a liquid changes to a solid. Objective: SWBAT describe the role of thermal energy on phase change.

Flow of the Day Do Now 5 min Intro to new material 5 min Guided Practice 15 min Exit slip 5 min Journal 8 min

Average Kinetic Energy = Temperature Temperature is a measurement of the average kinetic energy of the particles within a substance. Meaning that temperature measures movement of particles. Temperature is proportional to the average kinetic energy of the molecules of a substance. That means if you double the Kelvin temperature of a substance, you double the average kinetic energy of its molecules. When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. A change in average kinetic energy is not directly proportional to a change in average speed.

Using Temperature to Indicate Phase Change Whenever there is a plateau there is a phase change. This means that there is two phases of the substance at the same time. http://www.youtube.com/watch?v=WY6mcPaw8_k&feature=related

Water Phase Change Graph D 100 gas C Temperature º C. liquid B Pass out the Water Phase Change Graph blank to all students. As we work through the phase changes, please add to your graph. This is a graph that shows the energy and temperature changes as water turns from a solid, ice, to a liquid, water, and finally to a gas, water vapor. As we make additions on the board, you will make the additions to your paper. Mark the letters A, B, C, D and E. (click) First, we show that the molecules of water in the solid form are tightly packed and in a regular pattern forming crystals. We’ll take a closer look at the actual pattern later. Draw the crystal lattice here showing that water is a solid below zero degrees Celcius. (click) Next we show water molecules in the liquid state here between zero and 100 degrees Celcius. Draw the molecules a bit farther apart and without a crystal structure. (click) And here we have water in the gas state with the molecules farther apart A solid Heat (thermal energy)

Water Phase Change Graph D 100 gas C Temperature º C. liquid B As water changes from solid to liquid to gas, what is happening to the energy of the molecules? (increasing) (click) What is happening to the temperature? (increasing) A solid Heat (thermal energy)

Water Phase Change Graph D condensing 100 boiling C Temperature º C. B freezing When the ice reaches zero degrees what starts happening? (melting from solid ice to liquid water) (click) If we were moving in the opposite direction, with decreasing energy and temperature, from liquid water to solid ice, what would that be called? (Freezing) (click) As the liquid water reaches 100 degrees, what happens? (change from liquid to gas, boiling) (click) If we were moving in the opposite direction, with decreasing energy and temperature, from water vapor to liquid water, what would that be called? (condensation, condensing) (click) Answer the questions of the bottom of your paper. melting A Heat (thermal energy) http://mutuslab.cs.uwindsor.ca/schurko/animations/waterphases/status_water.htm

-Heat change in Potential Energy -Particles get farther apart Between B and C -Heat change in Potential Energy -Particles get farther apart -Temp. stays same -MELTING Between D and E -Heat change in Potential Energy -Particles get farther apart -Temp. stay same -Boiling Between A and B -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -Solid Between E and F -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -Gas Between C and D -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -liquid D E B C A

Journal Describe how the phases change in the water cycle.

Exit Slip Standard: PS 4.2c - During a phase change, heat energy is absorbed or released. Energy is absorbed when a solid changes to a liquid and when a liquid changes to a gas. Energy is released when a gas changes to a liquid and when a liquid changes to a solid. Objective: SWBAT describe the role of thermal energy on phase change.