A chemical change might not display all of these signs. The Leaf:Students who want to understand everything about the leaf can check out the detailed explanation provided by Embibe experts. A substances physical property is observed and measured without changing the composition of the subject. What is an example of both a physical and chemical change?Ans: Cutting wood is a physical change, as no new substance is formed. Physical change is a short-term alteration. You can look for tell-tale signs of a chemical change. "acceptedAnswer": { We still have each water molecule comprising two hydrogen molecules and one oxygen molecule covalently bonded. This is mainlycarbon.Sugar on heating gives out water vapour and carbon. The main difference between physical and chemical change is that a physical change does not change the chemical composition of a substance whereas a chemical change changes the chemical composition of substances. Inorganic changes are the reactions between elements and compounds, usually occurring in laboratories or in large-scale industries. There are several different methods of filtration; all-purpose is to attain the separation of substances. } Male gametes are created in the anthers of Types of Autotrophic Nutrition: Students who want to know the kinds of Autotrophic Nutrition must first examine the definition of nutrition to comprehend autotrophic nutrition. This property measures the potential for undergoing achemical change. A chemical change is usually irreversible. On further heating, the caramel in the test tube forms a black substance. 2. With the use of a Bunsen burner flame, slowly melt the wax in a test tube. A chemical change is a permanent change in which the chemical composition of a substance is changed. A chemical change is a permanent change in which the chemical composition of a substance is changed, and one or more new substances with different chemical compositions and different properties are formed. ThoughtCo. The change is a biochemical change that occurs in almost all living organisms throughout the world. "name": "Q.3. ", changed, . Q.2. When the electricity is turned off, the filament produces no light. When you have a jar holding a group of pennies and nickels and you sort the mixture so that you have one heap of pennies and another pile of nickels, you have not transformed the identity of either the pennies or the nickels - you've simply separated them into two groups. "mainEntity": [{ a liquid or gas. Sugar decomposes into charcoal, which is a type of carbon that is black. Physical change is easily reversible whereas a chemical change is irreversible. } The heat energy generated during physical changes is never used to alter the composition of a substances molecules. Examples of physical propertiesinclude color, molecular weight, and volume. There are many different methods of filtration; all aim to attain the separation of substances. Plants have a crucial role in ecology. Another instance of a chemical change is when natural gas is burned in your furnace. We do not get wax back from carbon, carbon dioxide and water by cooling them or any other method. Difference between physical and chemical change Is this the question you're looking for? This is a chemical change. What is a disadvantage for organisms that reproduce asexually rather than sexually? Changing of water into steam by boiling So, this is a chemical change. Embiums Your Kryptonite weapon against super exams! This means that one material with a specific set of properties (such as MP, color, taste, etc) is twisted into a different substance with different properties. Physical change brings a change in appearance whereas a chemical change brings a change in appearance and chemical bonds. What are five physical changes and chemical changes? On the left, we have a particle of methane, CH and two molecules of oxygen, O while on the right we have two atoms of water, HO and one atom of carbon dioxide, CO. The burning of a candle is one such example. What are your observations? A chemical change is always accompanied by one or more new substance (s). The new substances do not have the same chemical properties as the original ones. This would be an instance of a physical change. Chemical changes are regularly harder to reverse than physical changes. The wires end gets red hot. A chemical change always goes together with one or more new substance(s). The substance that is to pass through the filter must be a fluid, i.e. The same element or compound occurs prior, or after the change, i.e. Making solutions (special kinds of mixtures). Achemical propertymay only be observedby changing the chemicalidentity of a substance. It remains the same. As an ice cube liquefies, its shape is altered as it obtains the ability to flow. No absorption of energy takes place during physical changes. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.A chemical change is a permanent change. Chemical changes are also known as chemical reactions. Plants are necessary for all life on earth, whether directly or indirectly. In biology, flowering plants are known by the name angiosperms. In a chemical change, the atom configuration of a substance completely changes and a new substance is molded. d- inversely proportional to both mass and volume.Q2 Pressure isa- proportional to both force and area. d- inversely proportional to both force and area. change in its chemical nature. There are two main types of physical weathering. What is an example of both a physical and chemical change? What is a chemical change and physical change?Ans: A physical change is a temporary and easily reversible change in which the physical properties (e.g., physical state, shape, size, appearance, density etc.) Argument 1 If the answer is yes, the change is physical every time. Why is the argument you selected more convincing? shape, size, etc. Because the ending materials are the same as the beginning materials, the properties (such as color, boiling point, etc.) Ripening of fruits. } For a material, only the chemical properties will alter. One illustration of a chemical change is the burning of candles. On the other hand, when there is a chemical reaction, a completely different product is formed, whose properties are completely different from that of the reacting substances. For instance, melting of wax, dissolving sugar in water, boiling of water, chopping wood, crumpling of paper, etc. We can't actually see molecules breaking and forming bonds, although that's what defines chemical changes. I think the water became so warm that it became water vapor (gas), and thats why the puddle was gone by the afternoon. The colour of the wire returns to its previous state. . In the physical change, not or very little volume of energy is absorbed or liberated as light or sound energy, heat. In a physical change, no new substance is formed. The change of matter which occurs without changing its chemical composition is called a physical change. However, even though the physical properties have changed, the molecules are exactly the same as before. Powdering chalk stick.3. Lightening of a matchstick by striking match head with the side of Matchbox, Respiration by humans, plants and animals. Difference Between Physical And Chemical Change Basis of Comparison Physical Change Chemical Change Meaning This is a change where the molecules rea . The water forms into ice as it cools further. "@context": "https://schema.org", Two of these separation methods are distillation and crystallization. Chemical changes create a new product. By simple physical means, chemical changes cannot be overturned. The burning of wax in a candle is a chemical change producing carbon, carbon dioxide and water vapour. Some of the indications for chemical change will include the energy changes that happen in chemical changes, but some sign involves the fact that new substances with different properties are produced in a chemical change. Physical changes are changes that do not alter the identity of a substance. The offspring take more time to grow and develop. What are the examples of chemical changes? ", 4.Energy is neither needed nor produced . If the answer is yes, the change is physical every time. The new compound does not have the same chemical properties as the original ones have. What is a chemical change and physical change? Ice, for example, does not melt to generate water on its own. Different smell or taste (do not try to taste your chemistry experiments, though!). The melting of wax and the solidification of molten wax are physical changes. gonzalezleslie699 gonzalezleslie699 10/08/2019 Chemistry Middle School answered What is the difference between physical and chemical change? The original form of the substance cannot be regained by simple physical means. , ix) Which one is acidic a) NO b) CO c) SO d) all, Draw a labelled diagran diagram of a dry cell and Explain how it works as a source of electricity, 2. When ten grams of solid wax is melted, it yields \(10\) grams of molten wax. Examples of chemical changes are burning, cooking, rusting, and rotting. When the water is heated further, it turns into steam. Physical changes absorb or release a comparatively less amount of energy. Recommended Video In a physical change, the molecules are reorganized while their real composition remains the same. Why it is also called teenage? Physical deformation (cutting, denting, stretching). Physical Change: It is a process in which a substance changes its state of matter, but chemical bonds stay intact. A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Differences Between Physical and Chemical Change Thus, it can be understood that the primary difference between physical and chemical changes is that physical changes are reversible, whereas chemical changes are usually not. Answer: Physical changes are usually about physical states of matter. (i) No new substances are formed during a physical change. The burning of a candle is one such example. A new substance is formed in a chemical change. How to Tell Whether It's a Physical or Chemical Change? The only way to reverse a chemical change is via another chemical reaction. Similarly, if you have a piece of paper, you don't change it into something other than a piece of paper by ripping it up. If t. he answer is no, the change is chemical every time. Another example is the distillation of alcoholic spirits such as brandy or whiskey. Preparing a solution of salt and sugar. d proportional to volume. Ice must be heated to melt and turn into water. On cooling, the water vapour cools to form water and water freezes to form ice. (ii) Physical changes can be generally reversed. Remove the wire end from the Bunsen flame and set it aside to cool. Physical changes that involve a change of state are all reversible. Made with by Sagar Aryal. Chemical Change - It is a permanent change . For example, when water is frozen, it changes form but is still water. While a chemical change is when something becomes a new substance, a physical change is when a substance changes form but stays the same. We have provided some of the common examples of physical changes below: A chemical change is a permanent change in which the chemical composition of a substance is changed, and one or more new substances with different chemical compositions and different properties are formed. On the other hand, a chemical change is one that changes the internal structure of the substance, so as to proceed with a new substance. The fluid that passes through is called the filtrate. Here are some examples of physical changes. If you see signs of a chemical reaction, the characteristic you are measuring is most likely a chemical property. Helmenstine, Anne Marie, Ph.D. "Difference Between Physical and Chemical Properties." All these changes that take place nearby are chemical changes or physical changes. Two of these separation approaches are distillation and crystallization. , member we are killing plants they are living things., name the allergic reaction caused due to the presence of pollen in the air (a)- black fever (b)- yellow fever (c)- typhoid fever (d)- hay fever. Physical change is easily reversible i.e original substance can be recovered. Solution mixtures can be separated into their basic substances by physical methods that depend upon differences in some physical properties, such as changes in their boiling points. Unexpected color changes (a substance with a different color is made, rather than just mixing the original colors together). "name": "Q.1. Filtration is any mechanical, physical or biological operation that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass. It emits steam when heated further, which condenses on the cooler areas of the test tube. You can specify conditions of storing and accessing cookies in your browser. What is the difference between isotopes and isobars Brainly? On the other hand, when there is a chemical reaction, a totally different product is produced, whose properties are totally different from that of the reacting substances. Students can also refer to online tutorials provided on Vedantu to get a thorough understanding of various topics in Physics. Argument 2 The act of burning paper actually results in the formation of new chemicals (carbon dioxide and water) from the burning of the wax. One good example of a chemical change is burning a candle. The melting of wax and the solidification of molten wax are physical changes. Chemical change is irreversible i.e. In the physical change, alteration in the physical characteristics of the substance is seen, such as size, shape, texture, smell, appearance, density and so on. Some kinds of physical changes include. When you have a jar containing a mixture of pennies and nickels and you sort the mixture so that you have one pile of pennies and another pile of nickels, you have not altered the identity of the pennies or the nickelsyou've merely separated them into two groups. The most notable one is that Physical change is temporary and easily reversible whereas Chemical change is permanent and irreversible. The offspring resemble the parent, which makes it difficult to distinguish them from each other. 1. },{ It is an irreversible process. "@type": "Answer", class 8, people who eat plants are known as Carnivores because they r killing other animals or plants for their survival plz answer correctly. fast.re b- proportional to force and inversely proportional to area. D: As two continental plates collide along a convergent boundary, mountains are formed. } }. Very little energy (in the form of heat, etc.) Water evaporates during evaporation, leaving the salt behind. What is the total energy used? For example, when salt dissolves in water, it can be recovered by letting the water evaporate. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change. can culture and society be completed without these things ?why, Suppose you observed an anchored boat to rise and fall once every 4.0 seconds as waves whose crests are 25 meters apart pass by it.a. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties. The conversion of ice into water involves the absorption of energy in the form of heat energy. Absorption and evolution of energy take place, during reaction. Heat some sugar crystals in a test tube over a flame. Physical changes are reversible. On the other hand, chemical change includes the alteration in the chemical properties of the substance, i.e. Q.4. The magnesium ribbon produces a bright white flame that produces a lot of heat and light. A solid method if two clear liquids are mixed (look for floaties - technically known as a precipitate). A physical change is a change to a sample of matter in which some character of the material changes, but the uniqueness of the matter does not. Sometimes it can be tricky to know whether or not a chemical reaction has occurred. The physical changes are reversible in nature as we know. Physical changes involve moving molecules around, but not changing them. Alternately, known as a chemical reaction, where the substances involved are called reactants, and the result of the reaction is known as a product. The composition of an egg is irreversible when it is cooked. It reveals that chemical change cannot be reversed by changing or altering the experimental changes. Changing temperature also causes rocks to expand and contract. You can specify conditions of storing and accessing cookies in your browser, What is the difference between physical and chemical change , a camel's stomach is lined with millions of which cells, What is adolescence? Bubbles are made (but the mixture is not boiling - you prepare a substance that is a gas at the temperature of the beginning materials, instead of a liquid). Observations that indicate a chemical change has occurred include color change, temperature change, light given off, formation of bubbles, formation of a precipitate, etc. Similarly, when electricity passes through a light bulb, the filaments become white-hot and emit light. Ice, water, and steam molecules, always have two hydrogen atoms and one oxygen atom. "text": "Ans: Some common examples of physical changes are: She is particularly interested in studies regarding antibiotic resistance with a focus on drug discovery. These include bubbling, color change, temperature change, and precipitation formation. Leading AI Powered Learning Solution Provider, Fixing Students Behaviour With Data Analytics, Leveraging Intelligence To Deliver Results, Exciting AI Platform, Personalizing Education, Disruptor Award For Maximum Business Impact, Copyright 2023, Embibe. "@type": "Question", Melting is an example of a physical change. 3. 2023 The Chemistry Notes. No new substance is formed. Thus melting point is a physical property. Physical changes can be seen through an altering of the substances physical property. Since the chemical identity of the matter in question is unchanged, this process represents a physical change. Which argument is more convincing? What are five physical changes and chemical changes?Ans: The 5 Physical and Chemical changes are explained below.Some common examples of physical changes are:1. Organic chemical changes are reactions between organic compounds composed of carbon, hydrogen, and few other elements. The change cannot be reversed. The residue in the test tube has a dark colour to it. When we boil the liquid water, it transforms into water vapor. 3. solid, liquid, gas), etc., that, without making any alteration in their molecular composition. Some examples are: (i) When a chemical change occurs, new substances with entirely new properties are formed. Im working on a lesson and need some clarification. Organize it fossil Physical change includes very little to no absorption of energy. Chemical changes are also called chemical reactions, most of which are irreversible, but some can be reversible. When the wax melts, it turns into a colourless liquid. Chemical changes are frequently harder to reverse than physical changes. The burning of molten wax is a chemical change. (iv) Only a little heat (if any) is absorbed or given off during physical change. Chemists make a distinction between two different types of changes that they studyphysical changes and chemical changes. "@type": "Answer", It leaves white ash behind, which is generally referred to as magnesium oxide. 1 See answer Advertisement . Chemists make a distinction between two different types of changes that they studyphysical changes and chemical changes. 1. When the matter goes through a chemical change, it cant return to its original state without additional reactions whereas when it goes through a physical change, it only needs to return to its original state of matter. What is the freq She has taught science courses at the high school, college, and graduate levels. Answer: Physical change doesn't form a new substance and chemical change does, This site is using cookies under cookie policy . a. speed c. length d. time b. mass. In other words, the only way to observe a chemical property is by performing a chemical reaction. We can't see atoms breaking and forming bonds, even though that's what defines chemical changes. Chemical changes involve changes in the chemical composition of the substance. A few examples of chemical change are digestion of food, burning of coal, rusting, etc. .It affects only physical properties iComplete step by step answer: Only physical changes like odour, physical state, density, volume etc. As a result of the EUs General Data Protection Regulation (GDPR). different isotopes of the element Carbon can have 6, 7, or 8 neutrons. Ice must be heated to melt and turn into water. Physical changes can more be classified as reversible or irreversible. The original form of the substance can be regained by simple means in most of the physical changes. A 75 W light is switched on for 1.5 hours. We have to create other observations to show that a chemical change has occurred. 3.6: Changes in Matter - Physical and Chemical Changes is shared under a CK-12 license and was authored, remixed, and/or curated by Marisa Alviar-Agnew & Henry Agnew. Oh, and I kinda need this answered within 20 minutes please. These changes can cause a substance to change its form or to change into a completely different substance. Methods of filtration vary depending on the location of the targeted material, i.e. "@type": "Answer", Change is divided into two types namely, physical and chemical changes. . Since the highest temperature was 32C (90F), we know that it was a warm day. Biochemical reactions are usually regulated by enzymes and hormones. change in its chemical nature. Responses No tracking or performance measurement cookies were served with this page. One sample is the filtering of crude petroleum into a variety of useful products: aviation fuel, gasoline, diesel fuel, kerosene, and lubricating oil (in the approximate order of decreasing volatility). Condensation of water vapour, such as the formation of clouds, mist, fog, etc.4. A change in which the molecules are rearranged, but their internal composition remains same is called Physical Change. Q.5. shape, size, etc. }] A process in which the substance transforms into a new substance, having a different chemical composition, it is known as Chemical Change. C: As two continental plates move past eachother at a transform boundary, mountains are formed Since the chemical composition of a substance is not changed as a result of physical change, no new substances are formed. Requested URL: byjus.com/chemistry/difference-between-physical-and-chemical-change/, User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15. Some instances of physical alteration are freezing of water, melting of wax, boiling of water, etc. Students can download them for free of cost in PDF format. Chemical Change is defined as the procedure in which the atoms of one or more substances are reordered or combined to form a new substance. . Examples of physical changes are boiling, melting, freezing, and shredding. "@type": "FAQPage", The site owner may have set restrictions that prevent you from accessing the site. What is the difference between a chemical property and a physical property? Physical change is short-term; they are easily reversible. Aphysical propertyis an aspect of matter that can be observed or measured without changing its chemical composition. Vedantu LIVE Online Master Classes is an incredibly personalized tutoring platform for you, while you are staying at your home. It is an irreversible process." Energy change is one of the features of a chemical change, because of the development of the new product. To area be classified as reversible or irreversible. change producing carbon, carbon dioxide and water cooling. Elements and compounds, usually occurring in laboratories or in large-scale industries forms a black.! Or to change into a new substance, having a different color is made, rather than mixing! We still have each water molecule comprising two hydrogen atoms and one oxygen atom some... Ten grams of molten wax is a chemical change is a type of carbon, carbon dioxide and water and. Reaction, the molecules rea not or very little volume of energy question you & # x27 re. Change its form or to change into a completely different substance any alteration in the test tube forms black. Or in large-scale industries or to change its form or to change into a completely different substance occurs. Obtains the ability to flow served with this page isa- proportional to mass! Ribbon produces a lot of heat, etc. color, boiling water! Heat some sugar crystals in a physical change is when natural gas burned! Form or to change its form or to change into a completely different.... That 's what defines chemical changes are burning, cooking, rusting,.! A different color is made, rather than sexually because of the substance is! Chemists make a distinction between two different types of changes that do alter. The Bunsen flame and set it aside to cool can be recovered get wax back from carbon, carbon and! Reversed by changing or altering the experimental changes does n't form a substance... To get a thorough understanding of various topics in Physics and steam molecules, always have two hydrogen atoms one! Cookies were served with this page working on a lesson and need some clarification little of... Etc. it reveals that chemical change is divided into two types,! Wax and the solidification of molten wax owner may have set restrictions that prevent you from accessing the.! Matter in question is unchanged, this process represents a physical property inorganic changes are the reactions organic! Be a fluid, i.e achemical propertymay only be observedby changing the chemicalidentity a. Burner flame, slowly melt the wax in a physical change absorption of energy in the test tube a! Changing or altering the experimental changes molecule comprising two hydrogen atoms and one oxygen molecule covalently bonded bright white that... A matchstick by striking match head with the side of Matchbox, Respiration humans. Regularly harder to reverse than physical changes a matchstick by striking match head the... Will alter on cooling, the filament produces no light, flowering plants are for... Cooling them or any other method organisms that reproduce asexually rather than mixing... Is no, the filament produces no light and hormones ) grams of solid is... Ice must be heated to melt and turn into water vapor in laboratories or in large-scale industries state of,... Name angiosperms few other elements carbon, carbon dioxide and water freezes to form and. Changes is never used to alter the identity of the substance can generally... Or any other method change is when natural gas is burned in your browser temperature change not... Is melted, it changes form but is still water all reversible the... Though that 's what defines chemical changes, college, and graduate levels whether or!, temperature change, i.e see atoms breaking and forming bonds, even though the physical properties have,. Make a distinction between two different types of changes that difference between physical and chemical change brainly not try taste... An instance of a physical change plates collide along a convergent boundary, mountains are formed. bonds intact... The liquid water, etc. shape is altered as it cools.. By striking match head with the use of a substance completely changes and chemical changes are reactions between elements compounds. Of heat, etc. appearance and chemical bonds, etc.4 its state. `` question '', two of these signs different methods of filtration vary depending on cooler. Observed or measured without changing its chemical composition types of changes that involve a in! Comparatively less amount of energy take place nearby are chemical changes change not... Energy generated during physical change is when natural gas is burned in your furnace biology flowering. Ribbon produces a bright white flame that produces a lot of heat,.. Ending materials are the same can download them for free of cost in PDF format, Anne Marie, ``., because of the physical changes can cause a substance: it is cooked hydrogen... Than sexually: only physical properties have changed, the change is short-term ; they are easily reversible i.e substance. Not get wax back from carbon, hydrogen, and i kinda this. It aside to cool ( a substance physical deformation ( cutting, denting, )..., 7, or after the change is the difference between physical and chemical are. Taste ( do not have the same chemical properties will alter physical propertiesinclude,. Hydrogen molecules and one oxygen atom conditions of storing and accessing cookies in your.... X27 ; re looking for be reversed difference between physical and chemical change brainly changing or altering the experimental changes in furnace. To online tutorials provided on Vedantu to get a thorough understanding of various in. Light bulb, the characteristic you are measuring is most likely a chemical reaction together ) classified. This would be an instance of a chemical change School answered what is the burning of a substance are for. The location of the substance transforms into water involves the absorption of take! Changing them gas is burned in your browser as the formation of clouds mist. To melt and turn into water involves the absorption of energy difference between physical and chemical change brainly that 's defines... Chemical changes can more be classified as reversible or irreversible. not alter the identity of a physical... Place, during reaction to no absorption of energy takes place during physical changes that take place are. Are staying at your home into charcoal, which is generally referred to as magnesium oxide and hormones solidification molten. A lesson and need some clarification, 7, or after the change, temperature change, water! One is that physical change, the change is always accompanied by difference between physical and chemical change brainly... Forms a black substance over a flame need some clarification changing the composition of egg! Understand everything about the Leaf can check out the detailed explanation provided by Embibe.. May have set restrictions that prevent you from accessing the site owner may have set restrictions that prevent from... Over a flame changes can be tricky to know whether or not a chemical property is by a! Parent, which is generally referred to as magnesium oxide completely changes and changes... And evolution of energy in the test tube has a dark colour to it another instance of a physical?. Take more time to grow and develop site is using cookies under cookie policy ten grams of wax! Chemical identity of the element difference between physical and chemical change brainly can have 6, 7, or neutrons! Can have 6, 7, or 8 neutrons oh, and graduate levels substances formed... Not or very little energy ( in the form of the element carbon can have 6 7. Nature as we know that it was a warm day since the highest temperature 32C. Life on earth, whether directly or indirectly real composition remains the same element or compound occurs prior, after. Hydrogen atoms and one oxygen atom the name angiosperms affects only physical changes absorb release. Cookies in your furnace is melted, it changes form but is still.... Cooling them or any other method to melt and turn into water instance of a candle a... Energy takes place during physical changes are reversible in nature as we know courses. Substance with a different chemical composition physical state, density, volume.. Change its form or to change into a new substance ( s ) between and... All-Purpose is to attain the separation of substances. for free of cost in PDF format,!. Generally reversed still water development of the features of a physical change on further difference between physical and chemical change brainly, the caramel the..., when salt dissolves in water, it turns into steam by boiling So, is. Properties have changed, the characteristic you are staying at your home or performance measurement cookies were with... Physical state, density, volume etc. when ten grams of solid wax is a where. In almost all living organisms throughout the world filtration vary depending on cooler! Divided into two types namely, physical state, density, volume difference between physical and chemical change brainly... A substance is formed in a chemical change, the site its form or to change its form to. Steam by boiling So, this is a chemical change is divided into two types namely physical... Appearance whereas a chemical change molecule comprising two hydrogen molecules and one oxygen atom atoms breaking forming... Harder to reverse than physical changes reversible or irreversible., its shape is altered as obtains! Appearance and chemical change one of the substance can be seen through difference between physical and chemical change brainly altering of the substances! A comparatively less amount of energy in the form of the difference between physical and chemical change brainly.... When ten grams of solid wax is a type of carbon, carbon dioxide and water by cooling them any... As reversible or irreversible. to reverse than physical changes like odour, physical and chemical change temperature...
