A new 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?

Chemical changes do not form new compounds do not decompose the old compounds form new compounds change the appearance of the old compounds

What is a mechanical advantage?

What is the greatest amount of ammonia (NH3) in moles that can be made with 4.7 mol N2 and 6.9 mol H2? Which reactant is limiting? How many moles of excess reactant will be left after the reaction?

What units of measurement do scientists use?

A student is instructed to make 0.250 liter of a 0.200 m aqueous solution of ca (no3) 2. what is a correct numerical setup for calculating the total number of moles of ca (no3) 2 needed to make 0.250 liter of the 0.200 m calcium nitrate solution?

What is the element 3O2 name

Why sulphur used for food preservation?

How would a solution that is labeled 5.0 molar be similar to one labeled 5.0 molal?

Calculate the percentage by mass of nitrogen in ptcl2 (nh3) 2.

Below are the structures of three fatty acids, palmitic acid, stearic acid, and oleic acid. what combination of these fatty acids could you use to make a fat that is liquid at room temperature?