True Or False Water Contracts On Freezing Class 11 Chemistry CBSE

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AnswerQuestion Answers for Class 12Class 12 BiologyClass 12 ChemistryClass 12 EnglishClass 12 MathsClass 12 PhysicsClass 12 Social ScienceClass 12 Business StudiesClass 12 EconomicsQuestion Answers for Class 11Class 11 EconomicsClass 11 Computer ScienceClass 11 BiologyClass 11 ChemistryClass 11 EnglishClass 11 MathsClass 11 PhysicsClass 11 Social ScienceClass 11 AccountancyClass 11 Business StudiesQuestion Answers for Class 10Class 10 ScienceClass 10 EnglishClass 10 MathsClass 10 Social ScienceClass 10 General KnowledgeQuestion Answers for Class 9Class 9 General KnowledgeClass 9 ScienceClass 9 EnglishClass 9 MathsClass 9 Social ScienceQuestion Answers for Class 8Class 8 ScienceClass 8 EnglishClass 8 MathsClass 8 Social ScienceQuestion Answers for Class 7Class 7 ScienceClass 7 EnglishClass 7 MathsClass 7 Social ScienceQuestion Answers for Class 6Class 6 ScienceClass 6 EnglishClass 6 MathsClass 6 Social ScienceQuestion Answers for Class 5Class 5 ScienceClass 5 EnglishClass 5 MathsClass 5 Social ScienceQuestion Answers for Class 4Class 4 ScienceClass 4 EnglishClass 4 MathsTrue or False.Water contracts on freezing.AnswerVerified571.2k+ viewsHint: When water freezes, formation of ice takes place. It changes from liquid to solid state. Water crystallizes into hexagonal structure. It begins to take a more stable and definite shape.Complete step by step answer:The normal behavior observed in any substance is that they usually expand when heated as their density decreases and contracts on cooling as their density is maximum. But water is an exception. Water has a special property which is known as anomalous expansion of water. Because of this property, water when it freezes, its density becomes maximum value upto \[{{4}^{{}^\circ }}C\]. After that when the temperature of water changes from \[{{4}^{{}^\circ }}C\text{ to }{{\text{0}}^{{}^\circ }}\text{C}\] the density of water decreases and hence water starts to expand. When water freezes, its molecules form a hexagonal structure and therefore its size expands. Water molecules contain two hydrogen atoms and one oxygen atom. Water molecules are held together by intermolecular force of attraction. In liquid state water molecules can freely move around the container. They do not have any specific arrangement. There is a force of attraction between the hydrogen atom of one water molecule and oxygen atom of another water molecule. Although this force is not that strong compared to O-O attraction.When the water begins to freeze into ice, the water molecules are held by H-O bonds. This bond is not as tight as an O-O bond. As the H-O force of attraction is present in ice, its size expands. Therefore, the statement saying water contracts on freezing is a false statement.Additional information:There are other substances which can expand upon freezing. They are:- Bismuth- Gallium- Acetic acidNote: - The anomalous expansion property of water helps to preserve the lives of aquatic plants and animals in cold climate. - The way this property protects marine life is that during cooling of water, it becomes very dense at \[{{4}^{{}^\circ }}C\]. Due to maximum density the water at the top layer reaches the bottom and the lightest water at the bottom of the water body comes to the top. This lightest layer at the top is the first one to get frozen. After the top layer is completely frozen, it will not allow the cold of the winter to reach the bottom. This is because water and ice are insulators. Hence protecting the aquatic lives.Recently Updated PagesMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for SuccessMaster Class 11 Maths: Engaging Questions & Answers for SuccessMaster Class 11 Biology: Engaging Questions & Answers for SuccessMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for SuccessMaster Class 11 Maths: Engaging Questions & Answers for SuccessMaster Class 11 Biology: Engaging Questions & Answers for Success

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