What are signs that a chemical reaction has occured

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

An engineer that designs buildings is a(n) a) civil engineer b) mechanical engineer c) chemical engineer d) aerospace engineer

Acertain substance has a solubility of 12 grams in 100 grams of water at 20°c. this means that the substance will begin to dissolve when 12 grams are present in solution when 12 grams of the substance are stirred into a beaker with 100 g of water, it will begin settling at the bottom when 12 g of the substance are dissolved in 100 grams of water, the solution will be dilute when 12 g of the substance are dissolved in 100 grams of water, the solution will be saturated