A physical change is generally . It is also the basis of its antioxidant properties in fats and oils where it reduces metal-catalysed oxidation by chelating traces of metals such as iron. nH2O, iron(III) which is different from elemental iron. 30 seconds . Mixing of ash obtained by the burning of magnesium with water is a chemical change. However, even though the properties of brass are different from copper and zinc, brass is not made via a chemical reaction. (1) Rusting of iron (2) Converting liquid water into steam (3) Preparing curd from milk (4) Burning of coal 18. It turns reddish brown. (d) Burning of crackers (b)-(vi) 10. Answer: (c) It was built more than 1600 years ago When sugar dissolves in water, this is an example of a ________. For instance, a block of wood may feel rough when you run your finger across it but rubbing the wood with sandpaper smooths the surface so it no longer feels rough. Rusting is an oxidation. A piece of metal may be heated in a fire until it glows, but the metal is the same material before heating and after cooling. Used Oil Management. Answer: It is a change bacause a new is formed. This chemical change releases energy as heat. (c) Chemical changes iNCERTExxmptar] physical. Put your answers on the blank space provided before the number. Answer: Explain. It turns reddish brown. (a) Identify the gasses evolved at the anode and cathode in the above experimental set up. Question 7. Chemical world. These changes lead to the formation of new substances. Moving water can have the same effect. Step I and Step II are How is stainless steel made? will explode in the presence of hydrogen. At the end of 3 days, the iron nail has rust all over its sides, head, and tip. Q. what does is mean when there is a physical change? [NCERT Exemplar] (a) Identify the gasses evolved at the anode and cathode in the above experimental set up. The only thing I can say to you is to keep hope. ____1. Name the gas which turns lime water milky. Which of these facts is responsible for its long stability? (a). If you have questions about licensing content on this page, please contact ngimagecollection@natgeo.com for more information and to obtain a license. Give reason in support of your answer. When food spoils, it starts breaking down. Question 1. Physical changes in matter are reversible: An ice cube can melt into liquid water, and then the liquid water can be frozen back into an ice cube. Answer: Formation of clouds is a physical change. Fireworks exploding ____ 2. Oxidation is a chemical change that involves the transfer of electrons or oxygen among atoms. 3. physical The bubbles are a release of carbon dioxide gas, a product of the chemical reaction between the baking soda and vinegar.Remember that the difference between a physical reaction and chemical reaction is that a chemical reaction cannot be easily reversed, if at all.Chemical Change or Physical Change?Sometimes it is difficult to determine whether a change is physical or chemical. For example, if you leave an iron nail outside, it will change color. Shawn compared a knife head-to-head with an ESEE 6, a knife known for its excellent toughness, made in 1095 steel. Plants prepare their food by a process called photosynthesis. 3. And he also explained the whole process. Q2. So, it is a chemical change. (T or F) Millions of online shoppers do not pay state or local tax on their online purchases because the retailers lack physical presence in the state. Rusting of iron is corrosion and its a chemical change because rust is a chemical compound called hydrated iron oxide Fe2O3. Oxidation (rusting) of iron in the air is a chemical change. 14. Question 17. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. The material becomes something new and different. (ii) Write a balanced chemical equation of another example of this type of reaction. It is found in various fruits and vegetables. His father helped him and they went to see the place where common salt was collecting. Question 5. National Geographic Headquarters 1145 17th Street NW Washington, DC 20036, National Geographic Society is a 501 (c)(3) organization. Iron does not rust in dry air, however, the presence of moisture, carbon dioxide and oxygen are major factors for rusting of iron.General reaction of rust formation is: Prevention: Rusting of iron is harmful because it slowly destroys iron articles and makes them useless. 4. Now, answer the following questions: To keep fat globules away some ice cream companies use it as an. (HOTS] (c) Sound is produced. Citric acid is one of the large numbers of metabolites produced by aspergillus species. Serious side effects of citric acid and sodium citrate include muscle twitching or cramping, swelling or weight gain, fatigue, mood changes, swift and fast breathing, rapid heart rate, anxious feeling, black or bloody stools, extreme diarrhoea or seizure (convulsions). Identify changes of matter as either physical or chemical change. The common salt can be obtained by the evaporation of sea water. (c) evolution of gas only (b) If iron objects are left in humid conditions for a longer time, they get covered with reddish brown ferric oxide (Fe2O3) layer. (b) change in temperature only Shawn compared a knife head-to-head with an ESEE 6, a knife known for its excellent toughness, made in 1095 steel. If no button appears, you cannot download or save the media. (b) Name the process by which salt is collected from sea water. The Rights Holder for media is the person or group credited. Ripening of a fruit is a chemical change because after ripening, a new product with different properties is formed. This indicates a [NCERT Exemplar] (f)-(ii), RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 ScienceChapter 1, NCERT Solutions for Class 10 ScienceChapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 ScienceChapter 7, NCERT Solutions for Class 10 ScienceChapter 8, NCERT Solutions for Class 10 ScienceChapter 9, NCERT Solutions for Class 10 ScienceChapter 10, NCERT Solutions for Class 10 ScienceChapter 11, NCERT Solutions for Class 10 ScienceChapter 12, NCERT Solutions for Class 10 ScienceChapter 13, NCERT Solutions for Class 10 ScienceChapter 14, NCERT Solutions for Class 10 ScienceChapter 15, NCERT Solutions for Class 10 ScienceChapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10, Air, copper sulphate, iron, vinegar, iron oxide, carbon, dioxide, iron sulphate, copper, lime water, water. When you reach out to him or her, you will need the page title, URL, and the date you accessed the resource. That means the impact could spread far beyond the agencys payday lending rule. Microsoft pleaded for its deal on the day of the Phase 2 decision last month, but now the gloves are well and truly off. (d) (i) to (iv) Answers: (d) (i) and (iii) Chemical changes, on the other hand, are not reversible: A log burned in a fire turns to ashes, but the ashes cannot be changed back It can also be prevented by galvanisation. A complete chemical equation represents the reactants, products and their physical states symbolically. (b) Are these changes chemical in nature? Stretching of rubber band is not a physical change. Question 9. Identify changes of matter as either physical or chemical change. (c) physical change that cannot be reversed This dissolution is easily identified as a physical change, because if the water is allowed to evaporate, the salt remains after all the water has evaporated, meaning it has not been permanently altered. Therefore, it is a physical change. Answer: Learn what defines a chemical reaction, indicators & examples of a chemical reaction, and physical change vs chemical change examples! This NCERT Exemplar solution covers questions on changes in the nature of the objects, the process of rusting, burning magnesium ribbon and copper sulphate reactions. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. (b) (ii) and (iii) Tags: Question 3 . (b) Physical changes which are not reversible. Many new products are formed. It will turn into steam. The molecules of the wood do not. When a firecracker explodes, giving off light and heat, and breaking the wrapper into many pieces, ________. Learn what defines a chemical reaction, indicators & examples of a chemical reaction, and physical change vs chemical change examples! Facebook Twitter Pinterest linkedin Telegram. 7. Name the gas evolved. The copper and zinc atoms are both in brass, but they do not chemically bond together. Chapter 1 of NCERT Solutions for Class 10 Science mainly deals with writing chemical equations, writing and balancing chemical equations. Chemical changes, on the other hand, are not reversible: A log burned in a fire turns to ashes, but the ashes cannot be changed back into a log.What Is a Physical Change?In a physical change, the material involved in the change is structurally the same before and after the change. Magnesium (Mg)+ Oxygen (O2) Magnesium oxide (MgO) Burning wood is one example. (d) It has not rusted after such a long period (d) All of the above This chemical change can be written in the form of word equation as follows: (a) Physical changes which are reversible. cooking an egg. Moving water can have the same effect. Study the following equation of a chemical reaction: (Board Term 1, 2015) H 2 + Cl 2 2HCl (i) Identify the type of reaction. Microsofts Activision Blizzard deal is key to the companys mobile gaming efforts. These salts are the reason for its use as a sequestering agent in industrial processes and as an anticoagulant blood preservative. A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. The formation of alloys is one example. 7. On cooling, crystals of sugar got separated. An alloy is a metal made from a mixture of other metals. They look for changes in temperature or color. The big difference came in the nail chop test where the 1095 had significant deformation; a typical resharpening was unable to take the edge back. Explosion of a cracker is a chemical change Explain. Answer: Microsoft pleaded for its deal on the day of the Phase 2 decision last month, but now the gloves are well and truly off. Is this property of fluorine physical or chemical? (b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate. Give one more such change which you observe in your surroundings. Here is an oxidized copper lion statute in front of the Chicago Art Institute and the Aon Center. 2. The process of rusting, or oxidization, exemplifies a chemical reaction. Lime water is calcium hydroxide solution. Some changes to matter are physical. (c) Only (ii) Some substances can be obtained in pure state from their solution by . On cooling, beautiful blue coloured crystals got separated (Step II). 14. (b) Zinc Identify the physical change in the following list. Answer: Building blocks. This contains a complex chemical called (z). nH2O, iron(III) which is different from elemental iron. Q. Any interactives on this page can only be played while you are visiting our website. 4. (a) Lime water turns milky on passing carbon dioxide gas through it. Fireworks exploding ____ 2. 1. A change from one state (solid or liquid or gas) to another without a change in chemical composition which can be made by freezing, melting or boiling a substance. Water Softener. Give one example for each type in the form of a balanced chemical equation. Burning of LPG Chemical change because LPG on burning form CO. As a preservative, flavouring agent, and vegetable rinse it helps in the food industry. Question 13. The initial process in the processing of raw wool is (x), in which wool is cleaned. Which of the following is a physical change? SURVEY . It is then allowed to evaporate in the sun. (e)-(iii) matter has changed. Which of the following is an example of a chemical change? In this reaction, blue colour of copper sulphate solution changes to light green colour due to the formation of iron sulphate. The only thing I can say to you is to keep hope. National Geographic Headquarters 1145 17th Street NW Washington, DC 20036, National Geographic Society is a 501 (c)(3) organization. A chemical change can lead to a change in temperature. (iii) make it look beautiful. Describe two changes that are harmful. This results in the rearranging of atoms in substances to form the products of a chemical reaction, which are brand new molecules that cannot be easily reverted back to their original state.Sometimes it is difficult to tell if a chemical reaction has taken place. Give an example of a chemical reaction for each of the following situations: [NCERT Exemplar] Rahul was a student of Class VII. 10. 7. salt Count the happy and sad faces then discuss why it is a physical or a chemical change. Think about ice melting into water. In chemical weathering, the rock disintegrates or even dissolves because a chemical reaction changed the composition of the rock. [NCERT Exemplar] When these two household chemicals are mixed together, it immediately starts bubbling and foaming. Some images used in this set are licensed under the Creative Commons through Flickr.com.Click to see the original works with their full license. 4. Here you can also find the answers to practical questions that involve chemical changes around us. glucose (food) and oxygen gas. If a media asset is downloadable, a download button appears in the corner of the media viewer. Write the differences between physical and chemical changes. (a) Rusting of iron Brass is made up of about 60 percent copper and 40 percent zinc, but brass has different properties than either copper or zinc alone. Answer: Iron(Fe) + Oxygen + Water Rust (Iron oxide) Question 10. A change from one state (solid or liquid or gas) to another without a change in chemical composition which can be made by freezing, melting or boiling a substance. 3. What happens when an iron blade of a knife is dipped in a copper sulphate solution? 1. rusting of a nail 2. freezing of water 3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gas A) 2, 3, 4 B) 1, 3, 4 C) 1, 3 D) 1, 2 E) 1, 4 (a) Heat may be given out but never absorbed, Question 10. It is found in hand soap, body wash, nail polish, face cleansers, shampoos and some other cosmetics products. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. magnesium oxide. All rights reserved, Sarah Appleton, National Geographic Society. Other changes are chemical. A complete chemical equation represents the reactants, products and their physical states symbolically. 5. How can you prevent them? View Answer. [NCERT Exemplar] Energy is in the formation of curd from milk. Which of the following is a chemical change? ____1. How ozone layer acts as a protective shield? That water can then be refrozen. 6.Rusting is a double decomposition reaction. The experiment in the diagram shows that both oxygen and water are needed for rusting to happen. In all these activities, we saw that in each change, one or more new substances are formed. You cannot download interactives. Souring of milk is a chemical change because original substances present in milk lose their nature and identity and form new chemical substances. Identify the chemical change in the following list. 8. To help determine whether there has been a reaction, chemists consider the basic indicators that a reaction has occurred, such as a change in temperature, a change in color, the development of an odor, the formation of a precipitate, or the formation of a gas.In a chemical alteration, the temperature change occurs as a result of the breaking or formation of chemical bonds. The table salt dissociated, but the atoms recombine into the same arrangement once the water is removed.Another example of a change that is difficult to identify as either physical or chemical is when two or more metals are mixed together when molten to form an alloy; an alloy is a metal that has different properties from the metals that were mixed together to make it. 4. However, they do not chemically bond together. (b) chemical and physical changes respectively Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. (b) It weighs about 6000 kg 9. physical, chemical [NCERT Exemplar] The HSC section Rust is chemically the hydrated ferric oxide [Fe 2 O 3.xH 2 O]. Evaporation of petrol Physical change as no new chemical substance is formed, energy absorbed. Matter is capable of undergoing changes, which are classified as either physical or chemical. Answer: Raw wool contains an oily substance, called (y). Question 1. When iron nails are dipped in copper sulphate solution, then the colour of the solution changes to green. Which one of the following is a chemical change? Building blocks. He requested his father that he want to see the process of obtaining salt from sea. This is called rusting of iron. You cannot download interactives. Chemical change A change that occurs when one or more substances change into entirely new substances with different properties Determine how much faster this will cook the potato. In order to prevent rusting, keep lawn trimmings and other unnecessary materials away from the in-ground pole. Prevention Fruits can be preserved by keeping them at low temperature and by using some specific preservatives. The two methods to prevent rusting are. Citric acid is used as a water softener in detergents, because of its an organic acid, chelating, and buffering properties. (a) Rahuls cycle was kept in the open for a longer time. This contains a complex chemical called (z). (c) Explosion of a firework produces heat, light, sound and unpleasant gases. Refresh the page or contact the site owner to request access. There are two components to its use as a flavouring the first is due to its acidity, which has little aftertaste; the second to its ability to enhance other flavours. It is very important for the students to solve and study with the help of the NCERT Solutions to get knowledge of the type of questions asked from the chapter, Chemical reactions and equations. Thus, rust and iron are not the same substance. However, table salt is an ionic compound. [NCERT Exemplar] A chemical change can lead to a change in temperature. True Is the following a physical or chemical change? Answer: The chemical properties of citric acid as a weak organic acid make it a strong softener for water. One way of shortening the time to bake a potato is to put a stainless steel nail through the potato and put it in the oven. If rust begins to form on any of the parts, carefully sand that area and paint it with outdoor gloss paint. Ca (OH)2 + CO2 [HOTS] The rusting of iron is a slow oxidation process. Melting and boiling are both examples of ________ changes. Sometimes the sour candy is covered with white powder which is citric acid. This chemical change releases energy as heat.A color change can be part of a chemical reaction. Report question . Chapter 1 of NCERT Solutions for Class 10 Science mainly deals with writing chemical equations, writing and balancing chemical equations. Question 15. Physical changes are reversible and do not produce a new substance. Q3. The rusting of iron is a slow oxidation process. matter has decomposed. 30 seconds . We should eat freshly cut apple because if we leave the apple after cutting, it starts turn to brownish due to the oxidation of the essential nutrients present in it and its food value decreases. The ice will melt and become water. Just as fast as the housing market went crazy, things can change in different ways. Give twaexamples for each of the following cases: That is why brass represents a physical change instead of a chemical one. Although both are acids, they are not identical. Question 16. Put your answers on the blank space provided before the number. 1996 - 2022 National Geographic Society. Answer: (i) Combination reaction. Express the change in the form of equation. People are going to be stuck and not be able to move, change their life or take new opportunities because of the lack of affordable housing and depressed wages. which type of path do planets follow around the sun? When you observe the formation of fog on a cool, humid day, what type of event are you observing? Answer: Rusting of iron causes a great loss over a period of time. Write a happy face ( ) if it is a physical change and a sad face if it is a chemical change. It has different properties than either copper or zinc alone. With the change in soil and climatic condition, the citric acid amount in vegetables and fruits also varies. Which of the following is a physical change? SURVEY . So, it is a chemical change. ultraviolet) may be given off or absorbed. (iv) make it dust free. What colour of flame is observed when magnesium ribbon burnt in air. After few months, he found that the cycle chain and even the handle gets rusted. (a) (i) and (ii) what type of change has occurred when a nail rusts. [NCERT Exemplar] Chemical world. Develop and use models to describe the nature of matter; demonstrate how they provide a simple way to to account for the conservation of mass, changes of state, physical change, chemical change, mixtures, and their separation. Is souring of milk a physical change or a chemical change? Report question . (a) Sea water is collected in shallow pits. Production by fermentation resulted in drastic lowering and stabilisation of the price of citric acid. Count the happy and sad faces then discuss why it is a physical or a chemical change. Answer: At the end of 3 days, the iron nail has rust all over its sides, head, and tip. New substance is formed. Citric acid is used as a water softener in detergents, because of its an organic acid, chelating, and buffering properties. Facebook Twitter Pinterest linkedin Telegram. For information on user permissions, please read our Terms of Service. It is found in hand soap, body wash, nail polish, face cleansers, shampoos and some other cosmetics products. Q 28. (b) Salt is obtained from sea water by the process of evaporation. which of these is an example of a chemical change that happens inside you body? As, the water evaporates, the salt solution becomes supersaturated (concentrated). 2. Answer: 6. During a(n) ________ change, the original substances are converted to new substances with different properties. No chemical bonds are formed. Explain why you consider them harmful? Which of the following is a physical change? Q 28. For example, if you leave an iron nail outside, it will change color. Metals like chromium and nickel are mixed (alloyed) with iron to make stainless steel. Water Softener. (a) Beating of aluminium metal to make aluminium foil Question 3. In chemical weathering, the rock disintegrates or even dissolves because a chemical reaction changed the composition of the rock. When rainwater goes back on the earth, no new product is formed. Can we call photosynthesis is a chemical change? Question 14. The three most common states of matter are solid, liquid, and gas.Texture is how something feels. Name the metal which is used for galvanising iron. Similarly, when a material changes phase, it only changes physically; the substance is still the same. Tutorials. Question 10. [HOTS] The following physical data may be u View Answer. (a) physical change that can be reversed It is found in hand soap, body wash, nail polish, face cleansers, shampoos and some other cosmetics products. The process of digestion is a chemical change. Melting of ice is also a change where solid changes into liquid state. Which is the chemical change in the following list? Answer: (a) How is common salt obtained from sea water? (b): Formation of crystals is a physical change rest others are chemical change. answer choices . It is great for general disinfection and cleaning because citric acid kills bacteria, mould and mildew. 1) rusting of a nail 2) tearing a piece of paper 3) cooking an egg 4) Citric acid is used in a number of other fields, in addition to its use in cleaning products, such as personal care, forestry, dairy, pharmaceutical, and electroplating. Inmanyconsumergoods,inthefoodandbeveragesectors,citricacidisused. Answer: A brown coloured deposit is found on the surface of the iron nail. We get a citric acid powder which is white. Which of the following is a physical change? Gold metal is formed from gold chloride in solution. Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. This chemical change releases energy as heat. General Chemistry; Organic Chemistry; An example of this is rusting. The turning of lime water into milky is a standard test of carbon dioxide. 6.Rusting is a double decomposition reaction. 9. (1) Rusting of iron (2) Converting liquid water into steam (3) Preparing curd from milk (4) Burning of coal 18. Matter is capable of undergoing changes, which are classified as either physical or chemical. Here is an oxidized copper lion statute in front of the Chicago Art Institute and the Aon Center. (c) What values are shown by Rahuls father? Decaying of fruits causes health hazards. The two kinds of changes are very different from each other.Physical changes can be reversed. matter has decomposed. "The holding will call into question many other regulations that protect consumers with respect to credit cards, bank accounts, mortgage loans, debt collection, credit reports, and identity theft," tweeted Chris Peterson, a former enforcement attorney at the CFPB who is now a law 7. Burning wood is one example. Investigate whether mass is unchanged when chemical and physical changes take place. That is because its chemical bonds are broken and the atoms get rearranged. (NCERT Examplar] Answer: (i) Combination reaction. tinsmith).Blacksmiths produce objects such as gates, grilles, railings, light fixtures, furniture, sculpture, tools, agricultural implements, decorative and religious items, cooking utensils, and Burning of a candle, lightning of a bulb, preparation of food by green plants, volcanic eruption, evaporation of petrol, burning of LPG. Here you can also find the answers to practical questions that involve chemical changes around us. She or he will best know the preferred format. Waves that bang against a rock or smash rocks together are other examples of physical weathering, so is freezing water that pushes a crack open as it expands. 1. Investigate whether mass is unchanged when chemical and physical changes take place. Improves skin tone and skin growth reducing wrinkles, acne scars etc. When rust spots appear on the body of a car, they show that a(n) ________ change is taking place at that site. Answer: The molecules of the water do not change. In a chemical change, the products are quite different from the reactants. Answer: It cannot be reversed by any method. When iron rusts, it produces a characteristic flaky red-brown solid, commonly called iron rust. The shape, texture, and temperature of the material can change though. Waves that bang against a rock or smash rocks together are other examples of physical weathering, so is freezing water that pushes a crack open as it expands. Iron does not rust in dry air, however, the presence of moisture, carbon dioxide and oxygen are major factors for rusting of iron.General reaction of rust formation is: Prevention: Formal theory. Question 10. Activity 3 Q1. Preparation of food by green plants Chemical change, energy absorbed. Formal theory. Answer: Within our bodies, food is digested due to chemical reaction. Answer: Importance of NCERT Exemplar for Class 7 Science Chapter 6 Physical and Chemical Changes. Rusting (corrosion) of iron and methods of prevention. "The holding will call into question many other regulations that protect consumers with respect to credit cards, bank accounts, mortgage loans, debt collection, credit reports, and identity theft," tweeted Chris Peterson, a former enforcement attorney at the CFPB who is now a law Question 10. Atoms can be combined with other atoms. True LEAVES OF GRASS By Walt Whitman Come, said my soul, Such verses for my Body let us write, (for we are one,) That should I after return, Or, long, long hence, in other spheres, There to some group of mates the chants resuming, (Tallying Earths soil, trees, winds, tumultuous waves,) Ever with pleasd smile I may keep on, Ever and ever yet the verses owningas, first, I Zinc metal is used for galvanising iron. Question 4. A change in the texture of a substance is a change in the way it feels.
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