Question

what is physical and chemical change​

Answer 1

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• ᴘʜʏsɪᴄᴀʟ ᴄʜᴀɴɢᴇs ᴏɴʟʏ ᴄʜᴀɴɢᴇ ᴛʜᴇ ᴀᴘᴘᴇᴀʀᴀɴᴄᴇ ᴏғ ᴀ sᴜʙsᴛᴀɴᴄᴇ, ɴᴏᴛ ɪᴛs ᴄʜᴇᴍɪᴄᴀʟ ᴄᴏᴍᴘᴏsɪᴛɪᴏɴ. ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇs ᴄᴀᴜsᴇ ᴀ sᴜʙsᴛᴀɴᴄᴇ ᴛᴏ ᴄʜᴀɴɢᴇ ɪɴᴛᴏ ᴀɴ ᴇɴᴛɪʀᴇʟʏ sᴜʙsᴛᴀɴᴄᴇ ᴡɪᴛʜ ᴀ ɴᴇᴡ ᴄʜᴇᴍɪᴄᴀʟ ғᴏʀᴍᴜʟᴀ. ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇs ᴀʀᴇ ᴀʟsᴏ ᴋɴᴏᴡɴ ᴀs ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴs.

Answer 2

Explanation:

Physical changes are limited to changes that result in a difference in display without changing the composition. Some common changes (but not limited to) are:

Texture

Color

Temperature

Shape

Change of State (Boiling Point and Melting Point are significant factors in determining this change.)

Physical properties include many other aspects of a substance. The following are (but not limited to) physical properties.

Luster

Malleability

Ability to be drawn into a thin wire

Density

Viscosity

Solubility

Mass

Volume

Any change in these physical properties is referred to as a physical change. For further information, please refer to Properties of Matter.

Chemical changes, on the other hand, are quite different. A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs. The following are indicators of chemical changes:

Change in Temperature

Change in Color

Noticeable Odor (after reaction has begun)

Formation of a Precipitate

Formation of Bubbles

Note: When two or more reactants are mixed and a change in temperature, color, etc. is noticed, a chemical reaction is probably occurring. These are not definite indicators; a chemical reaction may not be occurring. A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical. This is because the composition of the car has not changed. Proceed with caution.

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