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Endothermic Reactions - Whippany Park High School

Endothermic ReactionsJean Brainard, Thanks to the AuthorsClick (No sign in required)To access a customizable version of this book, as well as otherinteractive content, visit Foundation is a non-profit organization with a mission toreduce the cost of textbook materials for the K-12 market bothin the and worldwide. Using an open-content, web-basedcollaborative model termed theFlexBook , CK-12 intends topioneer the generation and distribution of high-quality educationalcontent that will serve both as core text as well as provide anadaptive environment for learning, powered through theFlexBookPlatform.

In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products than is needed to break bonds in the reactants. The opposite is true of endothermic

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Transcription of Endothermic Reactions - Whippany Park High School

1 Endothermic ReactionsJean Brainard, Thanks to the AuthorsClick (No sign in required)To access a customizable version of this book, as well as otherinteractive content, visit Foundation is a non-profit organization with a mission toreduce the cost of textbook materials for the K-12 market bothin the and worldwide. Using an open-content, web-basedcollaborative model termed theFlexBook , CK-12 intends topioneer the generation and distribution of high-quality educationalcontent that will serve both as core text as well as provide anadaptive environment for learning, powered through theFlexBookPlatform.

2 Copyright 2014 CK-12 Foundation, names CK-12 and CK12 and associated logos and theterms FlexBook and FlexBook Platform (collectively CK-12 Marks ) are trademarks and service marks of CK-12 Foundation and are protected by federal, state, and form of reproduction of this book in any format or medium,in whole or in sections must include the referral attribution (placed in a visible location) inaddition to the following as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordancewith the Creative Commons Attribution-Non-Commercial (CC BY-NC ) License ( ), as amended and updated by Creative Com-mons from time to time (the CC License ), which is incorporatedherein by this terms can be found at : November 19, 2014 AUTHORJean Brainard, 1.

3 Endothermic ReactionsCHAPTER1 Endothermic Reactions Define Endothermic reaction. Describe the role of energy in Endothermic Reactions . Give examples of Endothermic you ever use an instant ice pack like this one? You don t have to pre-cool it in the freezer. All you need to do issqueeze the pack and it starts to get cold. How does this happen? The answer is an Endothermic chemical Is an Endothermic ReactionAll chemical Reactions involve energy. Energy is used to break bonds in reactants, and energy is released when newbonds form in products. In some chemical Reactions , called exothermic Reactions , more energy is released whennew bonds form in the products than is needed to break bonds in the reactants.

4 The opposite is true of endothermicreactions. In anendothermic reaction, it takes more energy to break bonds in the reactants than is released whennew bonds form in the Change in Endothermic ReactionsThe wordendothermicliterally means taking in heat. A constant input of energy, often in the form of heat, isneeded to keep an Endothermic reaction going. This is illustrated in Energy must be constantlyadded because not enough energy is released when the products form to break more bonds in the reactants. Thegeneral equation for an Endothermic reaction : H represents the change in + Energy ProductsIn Endothermic Reactions , the temperature of the products is typically lower than the temperature of the drop in temperature may be great enough to cause liquids to freeze.

5 That s what happens in the Endothermic re-action at this URL: .Q:Now can you guess how an instant cold pack works?A:Squeezing the cold pack breaks an inner bag of water, and the water mixes with a chemical inside the pack. Thechemical and water combine in an Endothermic reaction. The energy needed for the reaction to take place comesfrom the water, which gets colder as the reaction of the most important series of Endothermic Reactions is photosynthesis. In photosynthesis, plants make thesimple sugar glucose (C6H12O6) from carbon dioxide (CO2) and water (H2O). They also release oxygen (O2) in theprocess.

6 The Reactions of photosynthesis are summed up by this chemical equation:6 CO2+ 6 H2O C6H12O6+ 6 O2 The energy for photosynthesis comes from light. Without light energy, photosynthesis cannot occur. As you can seein , plants can get the energy they need for photosynthesis from either sunlight or artificial An Endothermic reaction is a chemical reaction in which more energy is needed to break bonds in the reactantsthan is released when new bonds form in the products. A constant input of energy, often in the form of heat, is needed to keep an Endothermic reaction going.

7 One of the most important series of Endothermic Reactions is photosynthesis. The energy needed for photo-synthesis comes from 1. Endothermic ReactionsFIGURE MoreWatch the series of slides and animations at the following URL. Then compare the energy changes in the reaction ofbaking soda with vinegar and the reaction of baking soda solution with calcium What is an Endothermic reaction?2. Why is the temperature of products likely to be lower than the temperature of reactants in an endothermicreaction?3. Describe an example of an Endothermic Christopher Auyeung.

8 Change in energy of an Endothermic reaction. CC BY-NC Left: Greg O Beirne (User:Gobeirne/Wikimedia Commons); Right: Josh Kelahan. Plants photosynthesizeusing sunlight or artificial light. Left: CC BY ; Right: CC BY


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