Calculate the entropy change for the reaction: Fe2O3(s) + 2Al(s) -> Al2O3(s) + 2Fe(s) Entropy data: Fe2O3(s): 90 J/K mol Al(s): 28.3 J/K mol Al2O3(s): 51 J/K mol Fe(s): 27.2 J/K mol

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br