Is mixing crushed chalk with water a chemical or physical change?

Answer 1

Definitely chemical. I can tell because when I do it, it lets off a sulfur smell, indicating that hydrogen sulfide has been released. I've run the same test with other acids and come up with similar results, only the residue left behind after evaporation is different. The hydrogen must be bonding with the sulfur inside the chalk and creating that strong smell (more noticeable if you use a odorless acid). Did you know that pure elemental sulfur is odorless? The true chemical you smell is hydrogen sulfide, not plain sulfur.

Answer 2

A chemical change, because the hydronium ions transfer their protons to the carbonate. thereby the protoned carbonate molecules fall apart in a molecule of water and a molecule of carbon dioxide

Answer 3

Mixing crushed chalk with water is a physical change. This is because the chalk particles are simply dispersed throughout the water, but no new substances are formed. The mixture can be easily separated back into its original components of chalk and water.

Answer 4

It would be a physical change. Anytime you have a "mix" it will be physical because chemicals need to be compounded to form a chemical change.

Answer 5

This is a physical change.

Answer 6

This is a physical change.

Answer 7

physical :)

Answer 8

physical