Classify each of the following as a physical or chemical change. Give reasons.
a. Drying of a shirt in the sun.
b. Rising of hot air over a radiator.
c. Buring of kerosene in a lantern.
d. Change in the colour of black tea on adding lemon juice in it.
Answers
a. Its a physical change because drying of shirt does not produce any new material.
b. Rising of hot air over a radiator is also a physical change because hot air will lift up and cold air will sink down.
c. Burning of Kerosine is also a chemical change because new thing is produced / substance produced.
d. Yes, its a chemical change when lemon acid reacts with tea to change its colour and can not be reversed back ( means its irreversible )
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Answer:
a. Its a physical change because drying of shirt does not produce any new material.
b. Rising of hot air over a radiator is also a physical change because hot air will lift up and cold air will sink down.
c. Burning of Kerosine is also a chemical change because new thing is produced / substance produced.
d. Yes, its a chemical change when lemon acid reacts with tea to change its colour and can not be reversed back ( means its irreversible )
Explanation:
What is a physical change?
In a physical change, the material involved in the change is structurally the same before and after the trade. kinds of a few physical changes are texture, shape, temperature, and a change inside the nation of count. A alternate in the texture of a substance is a exchange in the way it feels. as an example, a block of wooden may additionally feel tough whilst you run your finger across it however rubbing the timber with sandpaper smooths the floor so it no longer feels hard. The timber itself has not changed during sanding to come to be a brand new fabric, most effective the feel of the floor changed. a chunk of metal can be heated in a fireplace until it glows, however the metallic is the identical material earlier than heating and after cooling. further, when a fabric changes section, it handiest changes physically; the substance remains the equal. think about ice melting into water, after which water being heated up and becoming steam. The chemical structure of water is the identical whether it's far a stable (ice), liquid, or gasoline (steam).
What's a Chemical change?
A chemical alternate happens whilst the composition of a substance is modified, which calls for the breaking and forming of chemical bonds at some stage in a chemical response. This consequences in the rearranging of atoms in substances to shape the products of a chemical reaction, which might be brand new molecules that can not be easily reverted returned to their unique country.
Classify each of the following as a physical or chemical change. Give reasons.
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