What volume of H2S (L) is produced at STP when 39.0 grams of Na2S react with an excess of HC1 as shown in the equation: Na2S + 2 HC1 → H2S + 2 NaCl?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.