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.

Which of the following orbital sublevels are possible?  Choose all that apply.

A certain railcar can hold up to gallons of material.  An operator would like to load this railcar with material A, which has a density of lbs/gal.  How many pounds of material A will the railcar be able to hold?  Be sure to express your answer to the correct number of significant digits.

Which subatomic particle — descriptor pairs are accurate?  Choose all that apply.