25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?
The administration of liquid D shows a chemical change taking place.
A chemical reaction or a chemical change refers to a procedure where one or more components get changed into one or more novel and distinct substances. It can be said that a chemical change refers to a chemical reaction in which the realignment of atoms takes place.
A physical change can get reversed, while a chemical change generally cannot get reversed. When a chemical change takes place, there is also a variation in the system's energy. A chemical change, which emits heat is known as an exothermic reaction, and the one that captivates heat is known as an endothermic reaction.
When the liquid D is placed over the white crystalline solid, fizzing took place and the solid got disappeared. Thus, the solid form got transformed into a new substance with a fizzing sound showing the emergence of heat, all this indicates a chemical change taking place.
Unchanged solid in a liquid does not even indicate any change.
Solid floating on top of liquid does not indicate any change, physical or chemical.
When a mixture creates a new compound (gas from mixing solid and liquid), there is a chemical change.