Question

1. What is the basic difference between physical and chemical changes?​

Answer 1

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Physical change :

# During a physical change , no new substance is formed

# A physical change is temporary

# A physical change is reversible

# Very little heat or light energy absorbed or given out in a physical change

Chemical change :

# During a chemical change , new substances are formed

# A chemical change is permanent

# A chemical change is generally irreversible

# A large amount of heat or light energy is absorbed or given out in a chemical change

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Answer 2

Physical change :

• During a physical change , no new substance is formed

• A physical change is temporary

• A physical change is reversible

• Very little heat or light energy absorbed or given out in a physical change

●Physical change refers to a change in which the molecules are rearranged but their I internal composition remains same.

●Tearing of paper, melting/freezing of water, cutting of tress etc.

●It is reversible.

●It can be recovered.

●No new product is formed in it.

Chemical change :

• During a chemical change , new substances are formed

• A chemical change is permanent

• A chemical change is generally irreversible

• A large amount of heat or light energy is absorbed or given out in a chemical change

●Chemical change is a process in which substance transforms into a new substance, having different chemical composition.

●Burning of paper/wood/paper, rusting of iron,etc.

●It is irreversible.

●It cannot be recovered.

●New product is formed in it.