Zinc reacts with hydrochloric acid according to the equation:  Zn + 2HCl -> ZnCl2 + H2       How many moles of H2 are produced from 20.0 g of Zn?

Which of the following would be considered a base under the Arrhenius definition?

Silver sulphide and hydrogen combine to form silver and hydrogen sulphide.  3.0 g of H2 and 100 g of Ag2S are used to produce 85.0 g of Ag. The equation for the reaction is:  Ag2S + H2 -> 2Ag + H2S a)    What is the actual yield of silver (Ag)? b)    Which reactant is the limiting reagent? Support your answer with calculations.  c)    What is the theoretical yield of silver?

One mole of sodium atoms contains:

Potassium reacts with chlorine based on the following reaction:  2K + Cl2 -> 2KCl If 6 moles of K is reacted with 2 moles of Cl2, which reactant is the limiting reagent?

How many moles of Cu are needed to react with 4 mol of AgNO3 based on the following equation?  Cu + 2AgNO3 -> Cu(NO3)2 +2Ag

Which of the following is not considered a major component of the troposphere?

Match the term with the correct statement by writing the appropriate number in each box.  Each term is worth 1 mark.

What volume of a 10 mol/L H2SO4 solution is needed to make 1 L of 1.0 mol/L solution of H2SO4?

The following is the equation for the electrolysis of water:  2H2O -> 2H2 + O2 The number of moles of H2, produced by the electrolysis of 4 moles of water is: