Presentation on theme: "SC.7.P.11.4 Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperature."— Presentation transcript:
SC.7.P.11.4 Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperature. (Also assesses SC.7.P.11.1.) Also Assesses SC.7.P.11.1 Recognize that adding heat to or removing heat from a system may result in a temperature change and possibly a change of state.
1- Anna pours herself some room-temperature soda from a bottle and adds four ice cubes. In a few minutes the ice cubes are smaller and the soda is much colder. Which of the following best explains the change in temperature of the soda? a. Heat flowed from the soda to the ice cube and caused it to partially melt. b. Coldness flowed from the ice cube to the soda, making the soda colder. c. The cold water from the melting ice went into the soda, replacing the warmer water that was in the soda. d. The water from the melting ice makes the soda more dilute, and the lower concentration makes the temperature lower. 2-Jeffery brings a book from air-conditioned apartment to a balcony on a hot summer day. How will the cool book interact with the outside air? a. Heat from the book will move to the air. b. Heart from the air will move to the book. c. Coolness from the book will move to the air. d. Coolness from the air will move to the book.
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* Whenever the temperature of an object or substance changes, heat is being transferred. It travels only in one direction (Hot to Cold) and by three different methods. Heat is transferred from warmer areas to cooler areas by conduction, convection, and radiation. 4 Crust forming on the surface of lava is an example of a change of state by transferring heat from the hot lava to the cooler air surrounding the lava.
* Think-Pair-Share!! * Discuss examples of each type of heat transfer with a partner for 90 seconds! 5
Conduction: Heat transferred by touching 6 Convection: Heat transferred by the motion of a substance Radiation: Heat transferred as waves through space
7 Energy is the ability to do work or cause change. All states of matter contain energy. A state is the form in which matter exists. When heat is added to a system, the temperature of substances in the system increases. When heat is removed from the system, temperature decreases. If enough heat is added to or removed from a system, substances in the system will change state. Whenever the temperature of an object or substance changes, heat is being transferred. It travels only in one direction and by three different methods. Heat is transferred from warmer areas to cooler areas by conduction, convection, and radiation. Conduction: Heat transferred by touching Convection: Heat transferred by the motion of a substance Radiation: Heat transferred as waves through space Where Does Heat Transfer on This Beach? List 4 examples! 1-Where Does Heat Transfer on This Beach? Answer the question using three examples: One for conduction, one for convection and one for radiation. 2-Explain the Law of Conservation of Energy with two examples from the picture. 3-Describe how heat will flow in the following system: “A piece of iron is heating until it glows “red hot” and placed several centimeters below a beaker of cold water”
1. Federico removes a metal spoon from a freezer and places it into a beaker of water that is at room temperature. Which of the following will occur? A.Heat will flow from the water to the spoon. B.Heat will flow from the spoon to the water. C.The temperature of the spoon will decrease. D.The water and the spoon will exchange heat at the same rate. 2. Beth takes a sip of very hot soup and decides to put an ice cube in her bowl. Which best describes what happens next? A.The cold from the ice evaporates in the air. B.Heat is destroyed as the ice melts. C.Heat from the soup flows into the ice cube. D.Cold from the ice cube flows into the soup. 3. Car engines generate a lot of heat. In a water-cooled engine, a water pump prevents the engine from burning up by circulating liquid coolant through the engine. That liquid is then pumped to the radiator. A fan then causes air to flow through the radiator. Which best describes the flow of heat through this system? A.The fan blows cool air through the engine, and heat leaves the engine in one continuous movement. B.The coolness from the water pump's liquid coolant flows into the hot radiator, cooling the system. C.Heat from the engine is transferred to the liquid coolant, which transfers to the radiator and then to the air. D.Heat is transferred to the air flowing through the radiator. It is then dissipated into the atmosphere. 9