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pH = 3.  What is the [OH-] concentration?

Given the following reaction: Ca  +  2 H2O  –>  Ca(OH)2  +  H2 How many moles of water are needed to react completely with 120 grams of Ca?

Given the following equation: 3 H2(g)  +  N2(g)    2 NH3(g)  +  heat

Given the reaction at equilibrium: 2 SO2(g)  +  O2(g)    2 SO3(g) + heat Which of the following changes would cause an increase in SO3 gas?

Element A has a molar mass of 12.50 g/mol.  Element B has a molar mass of 15.25 g/mol.  They make a compound, AB2. Please calculate the % by mass for Element A and the % by mass for Element B. Type in your work below.

Given 22889 Ra  –>  22890 Th  +  ____.  What type of nuclear radiation is demonstrated?

Consider the following system at equilibrium: N2(g)  +  3H2(g)    2NH3(g)  +  heat Which of the following changes would shift the equilibrium to the left? Please select all correct answers (there is more than one correct answer): increase the temperature removing some NH3 increasing the volume decreasing the volume decrease the temperature adding some NH3 removing some H2 adding some N2  

40 grams of ammonium chloride is dissolved in 100 grams of water at 10 degrees Celsius.  The solution is:

Please type in the proper name for the following molecule:  FeSO4

A sample of an element reveals that it has the following isotopes:  X-35, X-36, and X-37.  What is it’s average atomic mass?