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taking place is when we burn wood in a fire, either in our homes or to cook food. See also: Question 10: Classify the following into elements, compounds, and mixtures.Īctivity solution Science class 9 Chapter 2 Is Matter Around Us Pure. What examples of chemical reactions are there in indigenous practices. G) Burning of a candle: Here wax reacts with oxygen and forms carbon dioxide with the release of heat as energy. The freeing of water involves only the physical change of states. Frying of foods in oil is the chemical change that change the taste of the food.Į) Digestion of food: Digestion of food involves the chemical breakdown of food into simple carbohydrates, fats, and amino acids.į) Freezing of water: Water freezes at 0☌. When yeast is added to dough, it begins to feed on starches - producing sugars, alcohol and carbon dioxide as byproducts. So, this is an example of only physical change.ĭ) The cooking of food: In cooking, many complex food particles are broken into smaller particles. So rusting is a chemical change.Ĭ) Mixing of iron filings and sand: Here mixing does not lead to any chemical reaction. The only way to reverse a chemical change is via another chemical reaction. Many physical changes are reversible, if sufficient energy is supplied. Examples of physical changes are boiling, melting, freezing, and shredding. Sample answer: If you lower the temperature of pure, liquid water to 0 C, the liquid will. During this process, water acts as a catalyst. Examples of chemical changes are burning, cooking, rusting, and rotting. The bread has undergone a chemical change, similar to burning. These are chemical processes.ī) Rusting of iron: In rusting, iron reacts with oxygen and forms its oxide. The metal grill getting hot is a physical change, the charcoal reacting with oxygen (which produces the heat) is a chemical change. From the way that your body digests food to a match burning when you strike it, chemical reactions can be found everywhere. Mixing baking soda and vinegar to produce carbon dioxide gas. Cooking isn’t the only place you see chemical changes. Digesting sugar with the amylase in saliva. A) Growth of a plant: Growth of the plant include the formation of new compounds. Mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH) Cooking an egg.
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