A) Suggest any three methods for the preparation of H2 gas by selecting suitable substance given below.

Na, Zn, CaH2, H2O, Al, NaOH, HCl

If the solubility of a particular solute is 10 g 100 g H2O at 20°C, which solution concentration would represent a supersaturated aqueous solution of that solute?

List all the possible quantum-jump transitions by which the excited atom could emit a photon.

The gasification of coal is a method of producing methane by the following reaction. C (s) + 2H2 (g) → CH4 (g) ∆H=?

A cabr2 solution has a concentration of 4m. what is the concentration if 2 l of the solution are mixed with 6 l of water?

Maya's playroom is 12 m2. The length of the room is 3 m. What is the width? 4 m 8 m 15 m 36 m

One example of a decomposition reaction is the electrolysis of water. the chemical reaction can be expressed by the equation 2 h2o →2 h2 o2. the reactant (s) of this chemical reaction is/are?

When the positive ion of one compound replaces the positive ion of another compound?

A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm.

How many moles of ZnCl, will be produced from 23.0 g of Zn, assuming CuCl, is available in excess?

Glaciation in Alaska is a result of interactions between which of the following "spheres"? Check all that apply. A. biosphere B. exosphere C. geosphere D. cryosphere E. atmosphere F. hydrosphere