Question

1)what is chemical reactions? how we prove chemical reaction?
what are the characteristic of chemical reaction. Define them6 ?

Answer 1

Definition of chemical reaction: a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor. Change of color (for example, silver to reddish-brown when iron rusts). Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.Chemical Change vs. Physical Change - Chemistry LibreTexts

· Common Physical Changes. Texture. Color. Temperature. Shape. Change of State.
· Physical Properties. Luster. Malleability. Ability to be drawn into a thin wire. Density. Viscosity.
· Common Chemical Changes. Change in Temperature. Change in Color. Noticeable Odor. Formation of a Precipitate. Formation of Bubbles.
· Outside Links.

Answer 2

The following can indicate that achemical change has taken place, although this evidence is not conclusive: Change of odor. Change of color (for example, silver to reddish-brown when iron rusts). Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.


Characteristics of Chemical Reactions. In its simplest form, achemical reaction is the process that results in the change of one set of substances into another. Chemical reactions are either spontaneous, which means they require no energy input, or they are nonspontaneous, which means they need a catalyst