what what is difference between chemical change , physical change and reversible change and irreversible change?

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reversible changes are those which can be reversed.eg. an ice can be turned into water by evaoupration also the formed water can be converted in ice by freezing this is reversible change      &irreversible changes are those which can not be reversedeg.if we burn a paper it converts into ash. but   that ash can't be converted  into paper.  that is it can not gain  its initial  state this is called irreversible change        &physical changes are those in which state of substance  is changed that eg. ice is converted in water it is changing it's state from solid to liquid so it is physical change.         :&chemical change is a change in which  chemical composition of a substance  is changedeg.the chemical composition of paper & it's ash is different  so it is a chemical changehope you understood my answer thank you.☺

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The type of change where a new kind of substance is formed is known as a chemical change and vice versa for physical change.The type of change which can be easily reversed by simple techniques is known as reversible change and vice versa for irreversible change

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khud dhund

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chemical change:- It is a type of change after which new substance is formed. It is mostly irreversible change.physical change:- It is type of change after which chemical properties of material doesn't not change.

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Chemical change is that in which a chemical change and it never reversed for example burning of wood it convert into ashPhysical in which physical property change it can be reversed

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chemical change is also known as irreversible change because during this type of change the chemical properties of the substance changes which is not reversible at all .physical change is also known as reversible change because in this type of change only shape and size of the substance change and not the chemical properties.

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chemical change is permanent and physical change is not permanent ex: firewood , ice

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Chemical Change:
A chemical change refers to a process in which one or more substances undergo a transformation and form new substances with different chemical compositions. It involves the breaking and forming of chemical bonds, resulting in the creation of new substances. Here are some key characteristics of chemical changes:

1. Formation of new substances: During a chemical change, the original substances are converted into entirely new substances with different properties.

2. Irreversibility: Chemical changes are typically irreversible, meaning it is difficult or impossible to revert the substances back to their original form.

3. Energy changes: Chemical reactions often involve the absorption or release of energy in the form of heat, light, or sound.

4. Change in chemical properties: Chemical changes result in the alteration of chemical properties such as reactivity, flammability, toxicity, and acidity.

Examples of chemical changes include the combustion of wood, rusting of iron, digestion of food in our bodies, and baking a cake.

Physical Change:
A physical change refers to a transformation that alters the physical properties of a substance without changing its chemical composition. The substance remains the same at the molecular level. Here are some key characteristics of physical changes:

1. No new substances formed: Unlike chemical changes, physical changes do not result in the formation of new substances.

2. Reversibility: Physical changes are often reversible, meaning the original substance can be restored without altering its chemical composition.

3. No energy changes: Physical changes usually do not involve the absorption or release of energy. However, energy may be required to initiate the change, such as heating or cooling.

4. Change in physical properties: Physical changes affect the physical properties of a substance, such as shape, size, state (solid, liquid, gas), density, color, and texture.

Examples of physical changes include melting an ice cube, boiling water, dissolving salt in water, crushing a can, and cutting paper.

Reversible Change:
A reversible change refers to a process that can be undone, and the original substance can be recovered without any alteration in its chemical composition. Reversible changes can occur in both physical and chemical processes. Key characteristics of reversible changes include:

1. Undoing the change: In reversible changes, it is possible to reverse the process and restore the original substance.

2. No formation of new substances: Reversible changes do not involve the creation of new substances.

Examples of reversible changes include melting and freezing of ice, evaporation and condensation of water, and dissolving and crystallization of salt.

Irreversible Change:
An irreversible change refers to a process that cannot be undone, and it is not possible to recover the original substance without altering its chemical composition. Irreversible changes can occur in both physical and chemical processes. Key characteristics of irreversible changes include:

1. Permanence: Irreversible changes cannot be reversed or undone.

2. Formation of new substances: Irreversible changes often involve the creation of new substances with different properties.

Examples of irreversible changes include burning of paper, digestion of food, decomposition of organic matter, and cooking an egg.

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