Copper metal can be recovered by burning copper (II) sulfide (Cus) in oxygen according to the reaction below:

CuS(s) + O2(g) → Cu(q) + SO2(g)

If this process is 81.1 % efficient
what mass (in kilograms) of copper will be made when 296.1 kilograms of copper (II) sulfide are reacted?

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.

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

What does the symbol (–hfus) indicate in a phase change?