Is color change a physical or chemical change?

Why is copper so widely sought on the world and new york mercantile exchange

In the first recrystallization, after the solid has been dissolved in warm acetone, the solution is allowed to cool slowly to room temperature. In an older procedure the warm solution was placed directly into an ice bath.

Which statement is true at STP? (The atomic mass of Zn is 65.39 u.)

Which of the following is true about an ionic compound? A. it is salt. B. It is held together by ionic bonds. C. It is composed of anions and cations. D. all of the above

Which term refers to the number of molecules or atoms that participate as reactants in an elementary step in a chemical reaction? molecularity particulates reactants submolecular

What chemical molecules are required for cellular respiration?

A 2-column table with 3 rows. Column 1 is labeled Substance with entries upper O subscript 2, upper N subscript 2, upper C upper O subscript 2. Column 2 is labeled Molar mass with entries 32.00 grams per mole, 28.02 grams per mole, and, 44.

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.