Which statement describes one of the main differences between a physical and a chemical change? a chemical change involves reactants and products, whereas a physical change involves only reactants. a physical change is a change of state, whereas in a chemical change the substance keeps the same form. a physical change brings about a different form of the same substance, whereas a chemical change forms a different substance. a chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.

Answer : The correct option is, A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

Explanation :

Physical change : It is a change in which the actual composition of the molecule remains same when the molecules are rearranged.

Chemical change : It is a change in which the actual composition of the molecule are changed completely when the molecules are rearranged.

Therefore, the correct answer is, A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).