In certain reactions a change of smell is observed give two examples from daily life of the same

A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed.

It results when a substance combines with another to form a new substance (synthesis or either decomposes to form more substances). The oxidation reaction is a chemical change example that causes a chemical reaction.

They are generally irreversible except by further chemical reactions. Chemical change examples include chemical reaction which develops the dye in the colour and creates a chemical change in the hair. There are three types of chemical changes namely organic, inorganic and biochemical change.

Chemical Change Examples

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Chemical changes happen around us all the time and not just in a chemistry lab. Some chemical change examples in our everyday life are mentioned below.

Burning of paper and log of wood
Digestion of food
Boiling an egg
Chemical battery usage
Electroplating a metal
Baking a cake
Milk going sour
Various metabolic reactions that take place in the cells
Rotting of fruits
Decomposition of waste
The explosion of fireworks
The reaction between salts and acids.
Rusting of iron
Lighting a matchstick

Organic Compounds are complex compounds of carbon in which one or more atoms are covalently linked to atoms of other elements. Some examples of chemical change involving organic compounds are stated below.

This is a clear example of a combustion reaction. Natural gas comprehends methane gas. When methane reacts with oxygen in the atmosphere it produces water and carbon dioxide. Hence, it is an example of chemical change.

It involves a series of changes. Fruits consist of ethylene. There is an increase in ethylene production when fruit gets damaged or when it is plucked. This results in the production of new enzymes which in turn reacts with the chemical present on the fruit. So, the fruit may witness several changes. Some changes are mentioned below.

The fruit becomes more juicy and soft.
Due to the breakdown of chlorophyll, the outer skin of fruit changes its colour.
Aroma emits from ripe fruit.

The reactions of compounds and elements that do not involve carbon atoms are the chemical changes involving inorganic compounds. Some examples of chemical change that involves inorganic compounds are mentioned below.

It is an irreversible process. Steel is formed by the addition of several other elements in definite quantities to iron, the basic element being carbon. This results in the formation of new substances, thus considering it has a chemical change. The properties of the newly formed substances are different from that of iron.

Firework consists of metal nitrates thus constituting burning compounds. When a firework is lit, combustion takes place leading to the formation of a new substance with the emission of light and heat. Thus, it can be considered a chemical change.

It deals with the chemistry of the activity and the growth of living organisms. An example of biochemical changes is mentioned below.

Photosynthesis is a process that is mainly used by plants to convert light energy into chemical energy. It is a chemical process that occurs in plants. In this process, plants convert water and carbon dioxide into sugars and oxygen.

1. Milk turns sour due to

(a) Conversion of lactose in lactic acid (b) Increased chemical changes (c) Conversion of lactic acid into lactose

(d) Both A and B

Ans: (d)

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.

A chemical transition, also known as a chemical reaction, is a process that transforms one or more substances into one or more new and different substances. A chemical transformation, in other words, is a chemical reaction involving the rearrangement of atoms.

Chemical transition conditions: colour change, precipitate formation, gas formation, smell change, change in temperature.

Wood burning is a chemical change when new materials are created that cannot be removed (e.g. carbon dioxide). For example, if a fireplace burns wood, there is no longer wood but ash. Certain examples include candle burning, iron rusting, cake baking, etc.

Chemical change requires a molecular level change to stop it from being reversed because it creates a new substance. Souring milk is a reverse process and new molecules are produced. Another example of chemical change — creating new air, bubbles, and colour changes like rust formation.

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All are chemical changes
A and B represent chemical changes
B is a physical change
A and B are physical changes

Chemistry happens in the world around you, not just in a lab. Matter interacts to form new products through a process called a chemical reaction or chemical change. Every time you cook or clean, it's chemistry in action. Your body lives and grows thanks to chemical reactions. There are reactions when you take medications, light a match, and draw a breath. These examples of chemical reactions from everyday life are a small sampling of the hundreds of thousands of reactions you experience as you go about your day.

Chemical reactions are common in daily life, but you may not recognize them.
Look for signs of a reaction. Chemical reactions often involve color changes, temperature changes, gas production, or precipitant formation.
Simple examples of everyday reactions include digestion, combustion, and cooking.

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Plants apply a chemical reaction called photosynthesis to convert carbon dioxide and water into food (glucose) and oxygen. It's one of the most common everyday chemical reactions and also one of the most important because this is how plants produce food for themselves and animals and convert carbon dioxide into oxygen. The equation for the reaction is:

6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

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Aerobic cellular respiration is the opposite process of photosynthesis in that energy molecules are combined with the oxygen we breathe to release the energy needed by our cells plus carbon dioxide and water. Energy used by cells is chemical energy in the form of ATP, or adenosine triphosphate.

Here is the overall equation for aerobic cellular respiration:

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy (36 ATPs)

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Anaerobic respiration is a set of chemical reactions that allows cells to gain energy from complex molecules without oxygen. Your muscle cells perform anaerobic respiration whenever you exhaust the oxygen being delivered to them, such as during intense or prolonged exercise. Anaerobic respiration by yeast and bacteria is harnessed for fermentation to produce ethanol, carbon dioxide, and other chemicals that make cheese, wine, beer, yogurt, bread, and many other common products.

The overall chemical equation for one form of anaerobic respiration is:

C6H12O6 → 2C2H5OH + 2CO2 + energy

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Every time you strike a match, burn a candle, build a fire, or light a grill, you see the combustion reaction. Combustion combines energetic molecules with oxygen to produce carbon dioxide and water.

For example, the equation for the combustion reaction of propane, found in gas grills and some fireplaces, is:

C3H8 + 5O2 → 4H2O + 3CO2 + energy

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Over time, iron develops a red, flaky coating called rust. This is an example of an oxidation reaction. Other everyday examples include formation of verdigris on copper and tarnishing of silver.

Here is the chemical equation for the rusting of iron:

Fe + O2 + H2O → Fe2O3. XH2O

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Thousands of chemical reactions take place during digestion. As soon as you put food in your mouth, an enzyme in your saliva called amylase starts to break down sugars and other carbohydrates into simpler forms your body can absorb. Hydrochloric acid in your stomach reacts with food to further break it down, while enzymes cleave proteins and fats so they can be absorbed into your bloodstream through the walls of the intestines.

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Whenever you combine an acid (e.g., vinegar, lemon juice, sulfuric acid, or muriatic acid) with a base (e.g., baking soda, soap, ammonia, or acetone), you are performing an acid-base reaction. These reactions neutralize the acid and base to yield salt and water.

Sodium chloride isn't the only salt that can be formed. For example, here is the chemical equation for an acid-base reaction that produces potassium chloride, a common table salt substitute:

HCl + KOH → KCl + H2O

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Soaps and detergents clean by way of chemical reactions. Soap emulsifies grime, which means oily stains bind to the soap so they can be lifted away with water. Detergents act as surfactants, lowering the surface tension of water so it can interact with oils, isolate them, and rinse them away.

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Cooking uses heat to cause chemical changes in food. For example, when you hard boil an egg, the hydrogen sulfide produced by heating the egg white can react with iron from the egg yolk to form a grayish-green ring around the yolk. When you brown meat or baked goods, the Maillard reaction between amino acids and sugars produces a brown color and a desirable flavor.