lpg (liquejied petroleum gas) is used as fuel in kitchen it exists as a liquid in a cylinder . when it comes out of the cylinder it becomes a gas change (a) it is burnt to produce heat energy (change 1 ) change A is a physical change and change B is a chemical 2) change A is a chemical change and change B is a physical change 3)both changes AandB are physical change 4) both change A and B are chemical changes
Answers
Answer:
Answer is 1) Change A is a physical change and change B is a chemical change
Explanation:
Change A is a physical change because when the lpg present in the form of a liquid in the cylinder changes into a gas an alternation occurs only in the state of the substance i.e. physical properties of a substance which doesn't affect the chemical composition of lpg nor it's nature and the main thing is that no new substance is formed during this change. While when the lpg , now in the gas form reacts with oxygen , many gases such as acetylene ,propane etc. are formed as well as their nature and chemical composition is entirely different from lpg and here is a combustion reaction occurred and every chemical reaction is a chemical change . And yes when lpg burns then the gases formed cannot be reversed to obtain the original substance i.e. lpg and hence is also an irreversible change . Therefore Change A is a physical change while Change B is a chemical change
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