60. Fossil fuels like coal contain primarily hydrocarbons, but they also contain a small amount of other elements, like sul- fur. What products result from the combustion of hydrocar- bons? What products result from the combustion of sulfur?

Consider a double replacement reaction between Zinc (ll) chloride and sodium hydroxide: ZnCl2+NaOH ==> Complete the chemical equation by: 1. Rewriting it to include electrically-neutral ionic product formulas for each formula. To clarify instead of just writing the product formulas rewrite the entire equation. Concerning the "electrically neutral" part, you are reminded that if for example, Na + Cl2 ==> were your reactants, you would not predict NaCl2 as a chemical product because that is not an electrically neutral compound formula. The Na would have a +1 charge and, the Cl would have a -1 charge, 2 (-1) charges would give an overall -2 charge which would not produce an overall 0 charge. 2. Balance it. 3. Add subscripts (aq, I, s, or g) to show how the reactants combine and which product will precipitate to be collected as a solid. 4. Provide subscripts for both reactants and both products.

Paraffin wax vapor reacts with oxygen gas to form carbon dioxide gas and water vapor. Paraffin wax is a mixture of hydrocarbons having a general chemical formula of CnH2n+2 where n is at least 16. Assume that for this wax n=30 1. Write the symbolic form of this chemical reaction. 2. Classify this chemical reaction and write the general form of this type of reaction. 3. If the wax is a solid at room temperature, why does the reaction state that it is a gas? 4. Explain why the reaction stopped after the glass was placed over the candle. 5. Explain what was on the inside surface of the glass and where it came from.

Which reactant is limiting in a propane fire? O a) propane O b) charcoal O c) oxygen O d) water 99+ C F5 F6 F7 F8 F9 F10 F11 F12 & * 5 6 7 9. T Y U 团

2 C2H4  +  6 O2  -->  4 CO2  + 4 H2O From the above reaction, how many moles of O2 are required for the complete combustion of 44.88 g of C2H4? a. 1.3 ×102  mol b. 3.00 mol c. 4.8 mol d. 11.25 mol

Write a balanced equation for the complete combustion of butane, C¸H10. Phases are optional. equation:

1. Is hydroxide a reactant or product in this reaction2. How many water molecules are in the final balanced equation3. Is water a reactant or product in this reaction4. What is the co-efficient for ReO4-