what is the difference between physical change and chemical reaction?
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Chemical changes happen when chemical reactions occur. They involve the formation of new chemical elements or compounds . Physical changes do not lead to new chemical substances forming. In a physical change, a substance simply changes physical state , eg from a solid to a liquid.
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A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
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As a result of a chemical reaction, new substances with new properties are formed. In this lesson, students will learn about physical and chemical changes. Physical changes will be demonstrated with playdough and/or M&M's Candy. The chemical change will be demonstrated by making “Elephant's Toothpaste.”
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A chemical change occurs when a new substance is formed through a chemical reaction like when fruit ripens or rots. When something undergoes a "chemical reaction" and a new substance is formed as a result, we call this chemical change. In some instances, simply applying heat can cause a chemical change.
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A chemical change occurs whenever matter changes into an entirely different substance with different chemical properties. ... Because chemical changes result in different substances, they often cannot be undone. Some chemical changes can be reversed, but only by other chemical changes.
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A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible.
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When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
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A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The properties of the products are different from those of the reactants. ... If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same.
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Chemical changes and physical changes. Chemical changes happen when chemical reactions occur. They involve the formation of new chemical elements or compounds . ... In a physical change, a substance simply changes physical state , eg from a solid to a liquid.
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The physical change is the melting of the wax. The chemical change is the formation of CO2. The answer is yes. Both a physical change and a chemical change can happen at the same time.
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A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.
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Physical changes are temporary and involve the transformation in different phases of matter like from solid to liquid; liquid to gas. Whereas chemical changes are permanent as it participates in the breaking and formation of new bonds to make the new compounds.
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Change in Temperature If temperature increases, as it does in most reactions, a chemical change is likely to be occurring. This is different from the physical temperature change. During a physical temperature change, one substance, such as water is being heated.
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What is the difference between a chemical and physical change? Chemical changes involves the production of an entirely new substance through breaking and rearranging atoms. Physical changes are usually reversible and do not involve the creation of different elements or compounds.
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Yes physical and chemical changes can occur together. eg:when a candle is burnt, water vapour, carbon dioxide, and many other materials are released which is a chemical change. but the melting of wax is a physical change.
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A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
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A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.