Which description correctly states the difference between a chemical and a physical property? A) Physical properties can only be observed in solid and liquid materials, while chemical properties can be seen in solid, liquid, and gas materials and involve temperature changes. B) Physical properties are seen when a material remains in one phase, while chemical properties are seen when materials shift from one phase to another, like from a solid to a liquid. C) Physical properties can be observed without changing into a new substance, while chemical properties are usually observable during a chemical reaction when a new substance is made. D) Physical properties are identified with the senses, like through sight and sound, while chemical properties can only be calculated with special tools, like thermometers and microscopes.

C) Physical properties can be observed without changing into a new substance, while chemical properties are usually observable during a chemical reaction when a new substance is made.

Explanation:

Physical Change                                                                                              

The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.  

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example :

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) > 2H 2O  (l)

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