Question

The gas we use in kitchen is in the form of liquid in the cylinder. When it comes out from the cylinder it becomes a gas (step –I), then it burns (step – II). Choose the correct statement from the following.
a. Only step – I is a chemical change.
b. Only step – II is a chemical change.
c. Both steps – I & II are chemical changes.
d. Both steps – I & II are physical changes.

Answer 1

Hey, ✋ there your answer is ______,

⏩ Answer :
c) Both steps - I & II are chemical changes.

⏩ Explanation :
Let's once recognize the definition of Chemical Change,
➖ Chemical Change : When one substance is combined with another substance and forms a new substance, this change of state and formation of new substance is known as chemical change.

↪Therefore, the gas in the cylinder was under high pressure and could not change it's state but when it comes out, it reacts with oxygen and changes it's state into gas form.

↪ Same, in the above ⤴ question, the gas is been transformed into fire and burns. When gas came in the contact of oxygen and any inflammable substance,it starts burning and forms fire.



✔ Hope it may helps u...!!! ☺

Answer 2

Dear Student,

◆ Answer -

(b) Only step – II is a chemical change.

● Explaination -

• When liquefied petroleum gas comes out of cylinder, it changes to gas. Here, physical property is changed but chemical compostion is same. Hence, it is only physical change.
• When natural gas burns in the air (oxygen), chemical composition of gas changes. Hence, it is chenical change.

Thanks dear. Hope this helps you...