The understandable notes- Chemical reaction and equations, Class 10, Part 1
Physical and Chemical Change 1. Physical Change A physical change is a change in the shape, size, or state of a substance, but its composition remains the same. No new substance is formed. ( Ye to i think sabko pata ho hoga ki physical chage ya fir chemical change kisi kehte hai. Nahi pata to sun lo jab bhi kisi substance ki shape, size yar fir uske state mai koi change aata hai tab physical change hota hai. Physical change mai koi naya product form nahi hota. Jaise ladki kaat kr furniture bana diya. Ye generally nature mai reversible hote hai yani ki inhe dubara wapis usi state mai laya jaa sakta. Jaise ice melt hokar pani ban gayi aur pani ko freeze krke ice bana di. Badi ladki ko kaatkr chota bana diya aur fir use chipka kar bada bana diya. Kul milakar substance apni original form mai hi rehta hai.) Examples: Melting Ice: When ice melts into water, it changes its state from solid to liquid, but it is still water. Tearing Paper: The paper is broken into pieces, but it is still p...
