11/28/11 Test Corrections Catalyst 1. How did you prepare for the test? 2. What grade do you think you earned on the test? Why? Test Corrections and Analysis Please follow the directions on the worksheet. Do NOT write on the worksheet! Complete in your notebook. 31L

11/28/11 Phase Changes Catalyst 1. How does something change from a liquid to a solid? What about from a liquid to a gas? Brainpop Video and Quiz Watch the video and we will do the quiz together. 32L

11/28/11 Phase Changes Learning Target #5 (Reminder) LT #5: I can describe the motion of particles in a solid, liquid, and gas (including phase changes). 32R

11/28/11 Phase Changes Definitions Physical 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 water Chemical change: a change in matter that produces one or more new substances. Examples = rust, burning a substance 32R

11/28/11 Phase Changes Physical or Chemical Change? 1. Drying wet clothes Physical 2. Cutting snowflakes out of paper Physical 3. Lighting a match Chemical 4. Rust Chemical 5. Boiling water Physical 6. Breaking down water into hydrogen and oxygen Chemical 32L

11/28/11 Phase Changes Independent Reading and Notes p. 96 Read “Changes Between a Solid and Liquid.” Answer the following questions 1. 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? 32R

11/30/11 Phase Changes Catalyst 1. What happens when the particles of a solid vibrate so fast they break free? The solid melts into a liquid. 32L continued

11/30/11 Phase Changes Independent Reading and Notes p. 96 Read “Changes Between a Liquid and Gas.” Answer the following questions 1. 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? 32R continued

11/30/11 Phase Changes Independent Reading and Notes p. 96 Read “Changes Between a Solid and Gas.” Answer the following questions 1. 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? 32R continued

11/30/11 Phase Changes States of Matter Comparison Chart Fill out the chart with a partner. Do NOT write on the worksheet. Complete it in your notebook. You will have 10 minutes to work. 32L continued

12/1/11 Phase Changes Catalyst 1. What is the opposite of vaporization (boiling/evaporation)? Condensation 2. 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

12/1/11 Phase Changes Key Definition Deposition = the change from a gas to a solid. The opposite of sublimation! Our final phase change!! 32R continued

12/1/11 Phase Changes Interpreting Phase Change Graphs Turn 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. 32R continued

12/1/11 Phase Changes Interpreting Phase Change Graphs: Answers 1. 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. 32R continued

12/1/11 Phase Changes Interpreting Phase Change Graphs: Answers 5. Water molecules in segment E have more thermal energy because they are at a higher temperature. 32R continued

12/1/11 Phase Changes Phase Change Practice 1. Create an example of a phase change. Question: “What happens when the particles of a solid break free?” Answer: Melting 2. 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)! 32L continued

12/1/11 Phase Changes Self-Assess on LT #5 LT #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. 32L

--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 You will correct the quiz together afterwards.

Quiz Grading Put the number correct over = = = = = 1

12/1/11 Compounds Catalyst 1. 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. 33L

12/1/11 Compounds Key Definitions Review: Molecule = 2 or more atoms bonded together Compound = 2 or more elements bonded together New: Chemical bond = when atoms combine, a force of attraction between 2 atoms, holds atoms together in molecules and compounds 33R

12/1/11 Compounds Class Reading p Answer 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 = CO 2 for carbon dioxide with 1 carbon and 2 oxygen atoms and CO for carbon monoxide with 1 carbon and 1 oxygen atom 33R

12/1/11 Compounds Class Reading p Answer 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. 33R

12/1/11 Compounds Class Reading p Answer 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. 33R

12/1/11 Compounds Class Reading p Answer 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. 33R

12/1/11 Compounds Class Reading p Answer 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. 33R

12/1/11 Compounds Heterogeneous or Homogeneous? Choose whether the example is heterogeneous or homogeneous. Raise your hand for your answer: Iced tea Homogeneous Sand and water Heterogeneous Coffee Homogeneous Air Homogeneous Salad Heterogeneous 33L