1. The exothermic reaction between liquid hydrazine (N2H2) and liquid hydrogen peroxide (H2O2) is used to fuel rockets. The products of this reaction are nitrogen gas and water. A. Write the balanced chemical equation.
B. How many grams of hydrazine are needed to produce 10.0 mol nitrogen gas?

2. Aluminum reacts with chlorine to produce aluminum chloride. Determine the mole ratio necessary to convert moles of aluminum to moles of aluminum chloride.

3. How many moles of cesium xenon heptafluoride (CsXeF7) can be produced from the reaction of 12.5 mol cesium fluoride with 10.0 mol xenon hexafluoride? CsF (s) + XeF6 (s)  CsXeF7 (s)

4. Lead(II) oxide is obtained by roasting galena, lea(II) sulfide, in air.
PbS (s) + O2 9g)  PbO (s) + SO2 (g)
A. Balance the equation and determine the theoretical yield of PbO if 200.0 g PbS is heated.
B. What is the percent yield if 170.0 g PbO is obtained?

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

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explanation: