The student's lab manual says to mix some of his cacl2 solution with an aqueous solution of sodium carbonate (Na2CO3).

1) what evidence of a chemical reaction would he expect to see?

2) A balanced chemical equation to show the reaction.

3) What kind of reaction is this?

What is the question

C. 1s22s22p63s23p43d104s24p5

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).