Hydrogen can be produced by heating

Hydrogen gas can be produced by the reaction of aluminium with a concentrated solution of:

Hydrogen gas can be produced by the reaction of Aluminium with a concentrated solution of

A portable hydrogen generator utilizes the reaction between calcium hydride and water to produce hydrogen. What mass of hydrogen can be produced by 70 g cartridge of calcium hydride?

Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a conentrated solution of hydrogen peroxide be obtanied ?

Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a conentrated solution of hydrogen peroxide be obtanied ?

The amount of heat produced in a heating element depends on "________"