Choose the best answer to fill in the blanks of the passage.  Some answers may be used more than once, some may not be used. 1)__________________________ allows the determination of a quantity of a product or reactant in a chemical reaction equation on the basis of a given quantity of a different product or reactant.  In such a calculation, a mass can be converted to a(n) 2)_________________ by division by the molecular weight of the compound, then the ratio to a different compound involved in the reaction determined using the coefficients of the reaction equation.  However, in some cases one reagent may be a(n) 3)________________, such that there will not be enough of this material for the other reagents to completely react.  In such a case, the other reagents will be 4)______________________, and there will be some left over once the reaction is complete.

For each group of elements, give the preferred ionization (charge) state when ionized.  Some answers may be used more than once, some may not be used.

The complete combustion of methane has a reaction enthalpy of -861.3 kJ/mol, according to the following equation: CH4(g)  +  2 O2(g)  –>  CO2(g)  +  2 H2O(l)     ΔHrxn = -861.3 kJ/mol Calculate the enthalpy for the combustion of grams of methane.  Give your answer in kJ, and be careful of the sign and significant figures.

Covalent bonds are usually formed between a _____________ and a ____________.

Classify the following reaction equation.  Choose all categories that apply. 2 Ca(s)  +  O2(g)  –>  2 CaO(s)

For the following reaction equation, which statments are true?  Choose all that apply. 4 A(aq)  +  3 B(s) –>  C(g)

Match each reactant and product in the following reaction equation to the correct coefficient so that the equation balances.  Some coefficients may be used more than once, some not at all. ____ C4H10 + ____ O2 –> ____ CO2 + ____ H2O

For the following reaction, calculate how many moles of FeCl3 are produced if grams of Cl2 are reacted with sufficient Fe. 2 Fe(s) + 3 Cl2(g) –> 2 FeCl3(s)

Which of the statements are true of the following reaction?  Choose all that apply. H2SO4(aq)  +  2 KOH(aq)  –>  K2SO4(aq)  +  2 H2O(aq)

A(n) _____________________ mixture would be expected to show uniform composition regardless of the position or volume of material sampled, a(n) _____________________ mixture would be expected to show varying composition depending on how and where it was sampled.