11/28/11

Test CorrectionsCatalyst1. How did you prepare for the test?2. What grade do you think you earned on the test? Why? Test Corrections and AnalysisPlease follow the directions on the worksheet. Do NOT write on the worksheet! Complete in your notebook.

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11/28/11

Phase ChangesCatalyst1. How does something change from a liquid to a solid? What about from a liquid to a gas?Brainpop Video and QuizWatch the video and we will do the quiz together.

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11/28/11

Phase ChangesLearning Target #5 (Reminder)LT #5: I can describe the motion of particles in a solid, liquid, and gas (including phase changes).

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11/28/11

Phase ChangesDefinitionsPhysical change: any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance. Examples = melting an ice cube, dissolving sugar in waterChemical change: a change in matter that produces one or more new substances. Examples = rust, burning a substance

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11/28/11Phase ChangesPhysical or Chemical Change?1. Drying wet clothesPhysical2. Cutting snowflakes out of paperPhysical3. Lighting a matchChemical4. RustChemical5. Boiling waterPhysical6. Breaking down water into hydrogen and oxygenChemical 32L

11/28/11Phase ChangesIndependent Reading and Notes p. 96Read “Changes Between a Solid and Liquid.” Answer the following questions1. What is melting? A melting point?2. What happens when a substance melts?3. What is freezing? 4. What happens when a substance freezes?5. What happens to the particles of a liquid as they lose more and more energy?

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11/30/11

Phase ChangesCatalyst1. What happens when the particles of a solid vibrate so fast they break free?The solid melts into a liquid.

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11/30/11

Phase ChangesIndependent Reading and Notes p. 96Read “Changes Between a Liquid and Gas.” Answer the following questions1. What is vaporization?2. When does vaporization take place?3. What are the 2 types of vaporization?4. What is evaporation?5. What is boiling? Boiling point?6. What is condensation? 7. What happens during condensation?

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11/30/11

Phase ChangesIndependent Reading and Notes p. 96Read “Changes Between a Solid and Gas.” Answer the following questions1. What is sublimation?2. What happens during sublimation?3. What physical state is skipped during the sublimation of a substance?4. How is dry ice an example of sublimation?

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11/30/11

Phase ChangesStates of Matter Comparison ChartFill out the chart with a partner. Do NOT write on the worksheet. Complete it in your notebook. You will have 10 minutes to work.

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12/1/11

Phase ChangesCatalyst1. What is the opposite of vaporization (boiling/evaporation)?Condensation2. What is sublimation?The change from a solid directly into a gas.3. If a solid changes into a liquid, which phase change is this?Melting*Review States of Matter Comparison Chart (Word doc)* 32L continued

12/1/11Phase ChangesKey DefinitionDeposition = the change from a gas to a solid. The opposite of sublimation!

Our final phase change!!

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12/1/11Phase ChangesInterpreting Phase Change GraphsTurn to p. 100 and copy down the Changes of States for Water graph at the top of the page. Answer questions #1-5 in your notebook.Hints:*The horizontal portions of the line represent phase changes. Look at the temperature (y-axis) at which this happens!*The slanted portions of the line represent a change in temperature.

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12/1/11Phase ChangesInterpreting Phase Change Graphs: Answers1. Temperature (◦C) is on the y-axis and time (minutes) is on the x-axis. 2. The temperature is rising from 0◦C to 100◦C.3. Segment B is 0◦C and the melting point of water. Segment D is 100◦C and the boiling point of water.4. Segment B is melting, or a change from a solid to a liquid. Segment D is vaporization, or a change from a liquid to a gas.

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Phase ChangesInterpreting Phase Change Graphs: Answers5. Water molecules in segment E have more thermal energy because they are at a higher temperature.

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12/1/11Phase ChangesPhase Change Practice1. Create an example of a phase change.Question: “What happens when the particles of a solid break free?”Answer: Melting2. You will ask your question to a partner and they will ask you their question. Then, switch partners!3. You will have 7 minutes to walk around the room and quiz each other. Quiz, quiz, switch (partners)!

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12/1/11

Phase ChangesSelf-Assess on LT #5LT #5: I can describe the motion of particles in a solid, liquid, and gas (including phase changes).Rate yourself on a 3, 2, 1 scale. Write it down and hold up your fingers as well.

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--You will now take a quiz on the states of matter and phase changes. Surprise! Good luck. --You will have about 20 minutes to complete the quiz.--Do NOT write on the quiz. Please use a separate sheet of paper.--If you are done early, please complete the following book work:Read Section 1 on p. 58-67. --You will correct the quiz together afterwards.

Quiz GradingPut the number correct over 20. 16-20 = 512-15 = 48-11 = 34-7 = 20-3 = 1

12/1/11

CompoundsCatalyst1. What is the difference between a chemical and physical property? *Review! Look back in your notes! A physical property (luster, density, melting point) can be observed without changing it into another substance while a chemical property (reactivity, flammability or ability to be burned) describes its ability to change into different substances.

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12/1/11CompoundsKey DefinitionsReview:Molecule = 2 or more atoms bonded togetherCompound = 2 or more elements bonded togetherNew:Chemical bond = when atoms combine, a force of attraction between 2 atoms, holds atoms together in molecules and compounds

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12/1/11CompoundsClass Reading p. 64-65Answer the following questions:1. What is a chemical formula?A chemical formula represents a compound and shows the elements in the compound as well as the ratio of atoms. *Example = CO2 for carbon dioxide with 1 carbon and 2 oxygen atoms and CO for carbon monoxide with 1 carbon and 1 oxygen atom

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12/1/11CompoundsClass Reading p. 64-65Answer the following questions:2. When elements chemically combine, what do they form?When elements are chemically combined, they form compounds having properties that are *different* from those of the uncombined elements.

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12/1/11CompoundsClass Reading p. 64-65Answer the following questions:3. Define mixture. What is true about the properties of each substance in a mixture?A mixture is made of 2 substances that are together but not chemically combined. Each substance in a mixture *keeps its individual properties.* There is also no set ratio for the substances in a mixture.

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12/1/11CompoundsClass Reading p. 64-65Answer the following questions:4. What is the difference between a heterogeneous and homogeneous mixture?In a heterogeneous mixture, you can see the different parts. In a homogeneous mixture, you can’t see the different parts because they are so evenly mixed.

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12/1/11CompoundsClass Reading p. 64-65Answer the following questions:5. What is a solution? What is it an example of?A solution can be a mixture of liquids, solids, or gases. It is an example of a homogeneous mixture because you can’t see the different parts.

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12/1/11CompoundsHeterogeneous or Homogeneous?Choose whether the example is heterogeneous or homogeneous. Raise your hand for your answer:Iced teaHomogeneousSand and waterHeterogeneousCoffeeHomogeneousAirHomogeneousSaladHeterogeneous

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