Which equation is balanced? Na+F2→2NaF 2Mg+O2→2MgO Al+3F2→AlF3 2Al+3O2→Al2O3

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Based on the equation and the information in the table, what is the enthalpy of the reaction?

What metric units would you use to measure the thickness of a key