Question

. write two differences between chemical change and physical change. Give two examples for each.​

Answer 1

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions

Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Explanation:

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Answer 2

Answer:

PHYSICAL CHANGE

• Physical changes are those changes, where there is no change in the mass of the substance and even the internal properties of the molecules remain same. Such changes are temporary. These changes involves the transformation in different phases of matter like from solid to liquid; liquid to gas or vice versa.
• No new substance is formed, that means the molecules and atoms are arranged in the same way in products as were in reactants.
• Physical changes are generally reversible.

CHEMICAL CHANGE

• Chemical changes are those changes, where there is the formation of the new substance and such changes are permanent. There are the breaking and formation of new bonds to make the new compounds.
• Chemical changes always produce new substances, the atoms and molecules rearrange themselves and form a new compound.
• Chemical changes are irreversible or some time reversible also.

Examples of Chemical Change

• Burning of paper and log of wood.
• Digestion of food.
• Boiling an egg.
• Chemical battery usage.
• Electroplating a metal.

Examples of physical change

• Crushing a can.
• Melting an ice cube.
• Boiling water.
• Mixing sand and water.
• Breaking a glass.

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