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Which of the following must be the same before and after a chemical reaction?
A) The sum of the masses of all substances involved.

B) The number of molecules of all substances involved.

C) The number of atoms of each type involved.

D) Both (a) and (c) must be the same.

Respuesta :

mariahmendez
I believe the answer would be The sum of the masses of all substances involved and the number of atoms of each type involved. 

So D. both a and c
adefioyelaoye

The following must be the same before and after a chemical reaction include:

  • The sum of the masses of all substances involved.
  • The number of atoms of each type involved.

What is a Chemical reaction?

This is the process in which reactants combine with one another to form products through rearrangement of their structures.

Option D was chosen as the factors which must be  the same before and after a chemical reaction are mentioned above.

Read more about Chemical reaction here https://brainly.com/question/11231920

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