Question

SHORT-ANSWER QUESTIONS : Answer in 10-15 words :


1. LPG is stored in a cylinder as a liquid. When you burn it in the stove, it is in the gaseous form. What kind of changes occur during the use of LPG ?

2. Distinguish between physical and chemical changes.

3. Write the worded chemical reaction that occurs during rusting.

4. Describe tinning of iron sheets.

5. Iron rusts, whereas stainless steel which contains large quantity of iron does not. Explain.​

Answer 1

Answer:

Burning of LPG involves both physical and chemical changes because when LPG comes out of cylinder and is converted from liquid to gaseous state it is a physical change.When the gas burns in air it is a chemical change.Similarly ,burning of candle is a physical as well as a chemical change because solid wax changes to liquid form and its form can be regained hence it is a physical change but burning of wax is a chemical change.