what is the simple definition of chemical change?
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Chemistry. a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.
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Physical changes do not alter the nature of the substance, they simply alter the form. Pure substances, such as compounds, can be separated through chemical changes. Chemical changes change the chemical composition of a substance and can only occur through a chemical reaction.
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A change in size or shape is a physical change. 22. A chemical change means a new substance with new properties was formed. ... When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change.
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A chemical change must occur. Chemical bonds are made or broken in order to create a new molecule. One example of a chemical reaction is the rusting of a steel garbage can. That rusting happens because the iron (Fe) in the metal combines with oxygen (O2) in the atmosphere.
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Chemical reactions are also known as chemical changes. There are many different ways to spot a chemical change. Five different signs include odor, temperature change, precipitate formation, production of gas bubbles, and a color change.
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Chemical change is when water is transformed into hydrogen gas and oxygen gas. ... While chemical change is when you have a substance that gets transformed into 1 or more different substances. So melting the ice will make it go back to water, melting iron will make it liquid iron … Thus, melting is a physical change.
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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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A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. ... Contrast this with a chemical change, in which chemical bonds are broken or formed so that the starting and ending materials are chemically different. Most chemical changes are irreversible.
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Which is an example of a chemical change? Ans: A chemical transition is the result of a chemical reaction, whereas a physical change is when the structure of matter changes, but not the chemical identity. Burning, cooking, rusting, and rotting are examples of chemical changes.
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A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
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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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Color. The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring.
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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. ... This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.
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Some example of physical change is freezing of water, melting of wax, boiling of water, etc. ... In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s). Physical change is easily reversible i.e original substance can be recovered.
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At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical - for example, iron rusts and iron oxide is formed. ... Chemical reaction is a process of changing from one chemical state to another and chemical change is a change in the state of a material.
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In a chemical change, a new substance is made, like when you burn a candle. In a physical change, no new substance is made, like when water turns to ice.
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An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. So much energy is released that the hydrogen gas released spontaneously burns in the air.