What is subshell and why do we use it if we have main shells already

Hard water often contains dissolved Ca2 + and Mg2 + ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution is 5.

Which of the following pressures is equal to 303,900 pa? 3.0 atm 303.9 atm 303,900 atm 3.00 mm Hg

For which of the following equilibria does Keq = [O2]? a. O2 (l) O2 (g) b. 2O3 (g) 3O2 (g) c. 2H2O (l) 2H2 (g) + O2 (g) d. 2Hg (s) + O2 (g) 2HgO (s) e. C (s) + O2 (g) CO2 (g)

How do everyday activities like driving a car and using electricity lead to global warming

The impact of fossil fuel combustion on the global carbon cycle

What is in a banana? give me specifics?!

Addition of an excess of lead (II) nitrate to a 50.0mL solution of magnesium chloride caused a formation of 7.35g of lead (II) chloride precipitate. What was the molar concentration of chloride ions in the solution (in mol/L) ?

2.70 L of a gas has a pressure of 0.63 atm. What is the volume of the gas at 105 kPa?

Which statements describe Rutherford's model of the atom? Select all that apply.

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. what volume of h2 is produced when 7.20 g of al reacts at stp?