The student's lab manual says to mix some of his CaCl2 solution with an aqueous solution of sodium carbonate (Na2CO3). i. What evidence of a chemical reaction would he expect to see? Explain your answer.

ii. Write a balanced chemical equation to show the reaction. Include state symbols.

iii. What kind of reaction is this?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.