Chapter 8 Lesson 3 SPI’S Before we get started… let’s review: What have we learned in our previous lessons in Chapter 8? Lesson 1: What is matter Lesson 2: The Difference between Physical and Chemical properties Work with a partner: Take a few minutes to look at the photos and captions in chapter 8 Lesson 3. See if you can figure out the main idea of this lesson. RAISE YOUR HAND IF YOU THINK YOU KNOW THE MAIN IDEA OF LESSON 3. IN THIS LESSON THE MAIN IDEA IS… HOW MATTER CHANGES STATE HAVE YOU EVER WONDERED? Where water goes when it’s boiled in a pot on the stove? Who Can Tell Me… What happens to a frozen ice pop that is left in the sun? These are both examples of how matter changes state. QUICK… WHAT IS THE MAIN IDEA OF THIS LESSON? JUST MAKING SURE YOU’RE PAYING ATTENTON HOW MATTER CHANGES STATE! Let’s read “Why It Matters…”on P. 306 to learn more about how matter changes state. VOCABULARY Learning a few new words… Take Out Your Science Journal VOCABULARY condensation – change of state from a gas to a liquid as energy is removed. VOCABULARY deposition – change of state from a gas to a solid as energy is removed. VOCABULARY evaporation – a slow or a gradual change from a liquid to a gas. VOCABULARY melting – change of state from a solid to a liquid as energy is added. VOCABULARY sublimation – change of state from a solid to a gas as energy is added. VOCABULARY thermal expansion – increase in size of a substance due to a change in temperature. VOCABULARY Vaporization (vay-pore-uh-zay-tion) – change of state from a liquid to a gas as energy is added. Who can tell me what we’re learning in this lesson? Think man, think!!! How Matter Change State IF you don’t have it yet, you’ll get it… Let’s read “Changes of State” on P. 308 Question (Infer) Why doesn’t a glass of water freeze solid when ice cubes are added to it? Answer (Infer) The water has enough energy to melt the ice cubes. Question (Cause and Effect) When the water on your skin evaporates, it makes your skin feel cool. Explain what is happening in terms of state changes and energy. Answer (Cause and Effect) Thermal energy from your body is added to the water, causing it to evaporate. Your body feels cool because it is losing thermal energy. Apply What You’re Learning Let’s say a scientist observes that water at the surface of a small pond is frozen. A thermometer indicates that the temperature at the bottom of the pond is 4 degrees Celsius. Can she conclude the pond is frozen all the way to the bottom? Explain. Apply What You’re Learning We know that water freezes at 0 degrees Celsius. Since the water at the bottom of the pond is 4 degrees Celsius, it is warmer than the freezing point of water. So, the water at the bottom of the pool is liquid. Skipping a step (How does that happen?) Sometimes, matter can skip the liquid state!! What’s up with that? Let’s read PP. 310 and 311 to find out how matter Can sometimes Skip the liquid state. While your classmate is reading, listen for the vocab. words “sublimation” and “deposition”. Use context clues to better understand their meanings. Sublimation: A solid changes directly to a gas without passing through the liquid state. Who can give an example of sublimation? Who can give an example of sublimation? Dry Ice Deposition: The opposite of sublimation. It is the change of state from gas to solid. Who can give me an example of deposition? Who Can Give An Example of Deposition: Frost The main idea of this lesson is to learn what? How Matter Changes State. Time to strut your stuff: (You can use your books) On a sheet of paper, answer questions 1-5 on P. 313. Remember to use complete sentences and correct punctuation. There will be a test over Chapter 8, so study, study, study!!! Okay, one last time… What was the main idea of lesson 3? On the count of 3 let’s all say it… 1…2…3… HOW MATTER CHANGES STATE!!! Way to go, champs!!!
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