Question

1)
mention any two difference between physical and chemical changes give one example of each ?

2)
list any two properties for each of the following case of matter which makes them suitable to be used as utensils for cooking food wires for Electrical connections?

Answer 1

here is your answer

1> Physical change refers to a change in which the molecules are rearranged but their internal composition remains same.Chemical Change is a process in which the substance transforms into a new substance, having different chemical Example of paper, melting/freezing of water, cutting of trees, etc.Burning of wood/trees/paper, rusting of iron, setting of curd, etc.

Answer 2

Answer:

Explanation:

1. Physical Change :  In a physical change, no new substancis formed.  The processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Chemical Change :A chemical change is always accompanied by one or more new substance(s). Ex. rusting, burning of paper,digestion of food.

2.Metals are used as utensils for cooking food because :-

(1) They are good conductors of heat  

(2) They can be easily beaten into thin sheets , or in other words they are malleable.

Eg: Aluminium  

Metals are used  as wires for electrical connection because :-

(1) They are good conductors of electricity

(2) They can be easily drawn into thin wires ( ductility)

Eg : copper