Why is a Roman numeral needed for iron compounds but not for compounds containing magnesium?

Total mass of H2O2 in 20 grams of an aqueous H2O2 solution

Which statement best describes the organelles in a cell? A. All organelles are involved directly with communication between cells. B. Organelles must work together and their activities must be coordinated. C.

Which is the correct measure of density? mass/volume mass x volume weight/volume volume/weight

Suppose an atom has a mass number of 23. which statement is true beyond any doubt? A. the atom has an odd number of neutrons. B. the atomic number is less then 11. C. the atom is not an isotope. D.

Under which circumstances are kp and kc equal for the reaction aa (g) + bb (g) ⇌cc (g) + dd (g) ?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure