Example Chemical Change - Meaning, Examples, Features, FAQs
What happens when iron slowly turns into rust, milk changes into curd overnight, or a candle burns and disappears? Why do some changes create entirely new substances while others don’t? You will find these answers by reading this article on chemical changes. Changes in which the original substance is transformed into one or more new substances with different properties.
Chemical Change
A chemical change is a change in which one or more substances are transformed into entirely new substances with different chemical and physical properties. During a chemical change, the original substance loses its identity because its chemical composition is altered. These changes usually occur through chemical reactions, where atoms rearrange themselves to form new molecules.
Chemical changes are generally permanent and irreversible. For example, when iron rusts, it reacts with oxygen and moisture to form rust, which is a new substance. Similarly, burning of paper, cooking food, digestion of food, and curdling of milk are common examples of chemical changes observed in daily life.
Read more :
- NCERT notes Class 11 Chemistry Chapter 1 Some basic concepts of Chemistry
- NCERT solutions for Class 11 Chemistry Chapter 1 Some basic concepts of Chemistry
- NCERT Exemplar Class 11 Chemistry Solutions Chapter 1 Some basic concepts of Chemistry
Example of Chemical Change
Once you understand what the definition of chemical change is, you can move on to the chemical change examples section. This section will help you to find 20 examples of chemical changes.
- Metal corrosion where there is moisture and oxygen
- Burning of wood
- The milk turns
- The composition of caramel sugar is heated
- Baking cookies and cakes
- Cooking any food
- Acid-base reaction
- Digestion
- Boil the egg
- Fruit ripeness
- Food rot
- Fermentation
- Lighting a matchstick
- The explosion of fire
- Photosynthesis
- Waste rot
- Making popcorn
- The composition of cheese in milk
- Heat of paper
- Burning candles
Chemical changes involving inanimate objects show distinct changes in the state of the final products in terms of state, color, etc. The chemical composition of the products will be completely different from that of the recycled ones.
Related Topics Link
General Chemical Changes
Temperature Change
Temperature change is a state of chemical change. For testing, one can place a thermometer in a container that tests the temperature. When it rises (occurs in most cases), a chemical change occurs. Body temperature changes are different. During a body change, for example, one thing like water is boiled. However, in the event of a chemical change, one substance is mixed with another, and the product is produced.
Change Color
The color change of an object is another chemical reaction. Suppose you look at the rust of the metal, you will notice that there is a change in color on the metal object, and it has turned orange. However, again, you have to remember that painting anything is not a chemical change
The Odour
When more than one substance is mixed, the odor is released by the reaction of chemical changes.
For example, you may have seen rotten eggs that smell bad, which are an example of a chemical reaction that occurs due to chemical decay. This is an example of eternal change.
Precipitate Composition
This substance is the most common indicator of chemical reactions. A solid that builds up inside a solid or solution is called a precipitate. However, it should not be driven by suspension. For example, when soluble carbonate is converted into barium, barium carbonate is formed.
Bubble formation
This is another sign of a chemical reaction. In the presence of bubble formation, temperature changes are also possible. They are the two things that can happen at the same time. For example, if sodium carbonate reacts with hydrochloric acid, it can produce foam, but sufficient hydrochloric acid must be present for the foam to be seen.
Chemical Changes Including Organic Compounds
Organic chemicals are complex carbon compounds in which carbon atoms are bonded with hydrogen and may also be bonded with atoms of other elements, such as oxygen, nitrogen, or sulfur. These compounds undergo chemical changes in which their chemical structure is altered, resulting in the formation of new substances with different properties. Some common examples of chemical changes involving organic compounds are given below.
Natural Gas Burns
This is a clear example of a chemical change involving combustion. Natural gas mainly consists of methane (CH₄). When methane reacts with oxygen present in the air, it burns and produces carbon dioxide and water, releasing a large amount of heat and light energy. Since new substances are formed and the process is irreversible, burning of natural gas is a chemical change.
Chemical reaction:
Methane + Oxygen → Carbon dioxide + Water + Energy
Digestion of Food
Digestion is a chemical change in which complex organic compounds, such as carbohydrates, proteins, and fats, are broken down into simpler substances. Enzymes and digestive juices help in converting food into glucose, amino acids, and fatty acids. The original food cannot be obtained again, making digestion a permanent chemical change.
Cooking of Food
Cooking causes chemical changes in organic compounds present in food. For example, proteins denature and starch undergoes chemical transformation when heated. The taste, colour, and nutritional properties of food change, indicating the formation of new substances.
Fermentation
Fermentation is a chemical change in which sugars are converted into alcohol or organic acids by microorganisms like yeast. For example, glucose is converted into ethanol and carbon dioxide during the fermentation process.
Burning of Wood or Coal
Wood and coal contain organic compounds. When they burn in air, they react with oxygen to form carbon dioxide, water vapour, ash, and heat. This change is irreversible and results in the formation of new substances.
Chemical Changes Including Inorganic Compounds
Chemical reactions and non-carbonated atoms are chemical changes involving inanimate matter. Some examples of chemical reactions involving inanimate substances are given below.
Steel Construction
It is an irreversible process. Iron is made from the inclusion of several other elements in a certain quantity in steel, the basic basis being carbon. This results in the formation of new materials, so it is considered that there are chemical changes. The features of the newly constructed material are quite different from those of the metal.
Firework Lighting
Fireworks contain iron nitrates, thus forming combustible elements. When the explosives are lit, a fire occurs that leads to the formation of something new by the release of light and heat. Therefore, it can be considered a chemical modification.
Is Photosynthesis a Chemical change
Photosynthesis is a chemical change that is the process most commonly used by plants to convert light energy into chemical energy. It is a chemical process that takes place in plants. Here, in the process, plants convert water and carbon dioxide into sugars and oxygen for plants
Also check-
Some Solved Examples
Question 1: Which of the following is an example of a chemical change?
A. Melting of ice
B. Tearing of paper
C. Rusting of iron
D. Dissolving sugar in water
Solution:
Rusting forms a new substance (iron oxide), so it is a chemical change.
Hence, the correct answer is option (C)
Question 2: Burning of a candle is considered a chemical change because:
A. It changes shape
B. It produces light only
C. New substances are formed
D. It can be reversed
Solution:
Burning produces carbon dioxide and water vapour, which are new substances.
Hence, the correct answer is option (C)
Question 3: Which of the following changes involves an organic compound?
A. Rusting of iron
B. Burning of methane
C. Freezing of water
D. Breaking of glass
Solution:
Methane is an organic compound, and its burning is a chemical change.
Hence, the correct answer is option (B)
Question 4: Milk turning into curd is a chemical change because:
A. It can be reversed
B. No new substance is formed
C. Taste and composition change
D. Only physical properties change
Solution:
New substances are formed during curdling, making it a chemical change.
Hence, the correct answer is option (C)
Question 5: When natural gas burns, the main products formed are:
A. Oxygen and nitrogen
B. Methane and oxygen
C. Carbon dioxide and water
D. Hydrogen and carbon
Solution:
Methane reacts with oxygen to form $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$.
Hence, the correct answer is option (C)
Frequently Asked Questions (FAQs)
A chemical change is the result of a chemical reaction, and a physical change is when the structure of the story changes, but not the chemical identity. Heat, cooking, rust and rot are examples of chemical reactions.
A chemical reaction, also known as a chemical reaction, is a process that turns one or more things into one or more new and different things. Chemical modification, in other words, chemical reactions that involve the reorganization of atoms.
Chemical modification conditions: color change, climate formation, gas formation, odor change, temperature change.
Burning wood is a chemical change in the production of new removable materials (eg carbon dioxide).
For example, if a furnace burns wood, it is no longer wood but ashes. Some examples include candle burning, metal rusting, cake baking, etc.
Chemical modification requires a change in cellular levels to stop regeneration because it creates something new. Sour milk is a flexible process and new molecules are produced.
Mutations do not produce new and unique chemical products, and chemical reactions do lead to new inventions. If you make an example of chemical changes and physical changes, you will easily understand.
In this sense, you will find many examples of chemical changes. If you read these examples, you will easily understand the properties of chemical reactions. These examples also come as questions in the tests.
Yes. You will find a number of examples related to chemical changes involving natural compounds.
