Anew statue of the town founder is erected in the park. at the unveiling, the statue is a orange-brown copper. after a year, the statue looks blue-green. has a physical or chemical change taken place?

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

1.aluminum chloride (alcl3), and sodium hydroxide (naoh) can react to form aluminum hydroxide (al(oh)3) and sodium chloride (nacl).    you have 13.4 g of aluminum chloride and 10.0 g of sodium hydroxide. answer the following questions: •what is the balanced equation for this reaction? •if you use all 13.4 g of aluminum chloride, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •if you use all 10.0 g of sodium hydroxide, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •how many grams of aluminum hydroxide will actually be made?     which reagent is limiting? explain your answer.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?