### Energy Changes and Rates Consider the reaction:?C2H4 (g) + 3O2(g) ?2CO2(g) + 2H2O(g)

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1. Consider the reaction:?C2H4 (g) + 3O2(g) ?2CO2(g) + 2H2O(g)

At certain conditions 0.26 moles of O2 is consumed in 3.0 minutes. What is the rate of production of CO2 in g/s?

1. Consider the reaction:?C2H5OH (l) + 3O2(g) ?2CO2(g) + 3H2O(g)

At certain conditions 13.44 L of CO2 is produced in 180.0 s at STP.?What is the rate of consumption of C2H5OH in g/min ? (Note 22.4 L/mol) (3 marks)

1. Given the reaction: Al(s) + 3Cl2 (g) ?2 AlCl3(s)?It is found that chlorine is consumed at a rate of 0.2485 g/s. Calculate the total mass of AlCl3 produced if this rate is maintained for 3.00 minutes.

2. Given the reaction: 2 H2(g) + O2 (g) ?2 H2O (l) , explain why this reaction is very slow at room temperature.

3. Given the reaction: N2(g) + 3 H2(g) ?2 NH3(g)?If the rate of formation of NH3 is 8.0 x 10-3 mol/s, calculate the rate of consumption of H2 in mol/s.

4. Given the reaction: Sn(s) + 2 HCl(aq) ??H2(g) + SnCl2(aq)?Give 4 methods by which the rate of this reaction could be increased

5. Consider the following reaction: Zn(s) + 2HCl (aq) ?ZnCl2 (aq) + H2(g)

a) What bonds are broken, and what bonds are formed?

b) Describe the reaction in terms of fast and slow steps.

c) Explain why increasing the concentration of HCl would increase the rate of this reaction

d) Describe a method for quantitatively assessing the rate of this reaction empirically (experimentally).

1. Write the following equation in complete ionic form:

Zn(s) + 2HCl(aq) ?H2(g) + ZnCl2(aq)

1. Write the same equation in net-ionic form:

2. Using a table of standard enthalpies of formation (there are many available on the internet free of charge if you Google it; Wikipedia has a generally reliable one), determine the enthalpies of the following reactions. Express your answer in kJ/mol. Show all of your work. (4 marks each).

a) C3H8(g) + 5 O2(g) ?3 CO2(g) + 4 H2O(g)

b) HCl(aq) + Ca(OH)2(aq) ?CaCl2(aq) + H2O(l)

c) Zn(s) + 2HCl(aq) ?H2(g) + ZnCl2(aq)

1. Use the following given enthalpies to find the enthalpy of reaction for the unknown reaction.

a) GIVEN:?Fe2O3(s) + 3 CO(g) ?2 Fe(s) + 3 CO2(g)

CO(g) + 1?2 O2(g) ?CO2(g) ...Find ?H for

4Fe(s) +3O2(g)?2Fe2O3

?H = 26.7 kJ ?H = 283.0 kJ

1. Describe, in terms of fusion reactions occurring in stars and other astronomical phenomena, the origin of every element naturally occurring in the universe (you may need to do a little research; the answer does not need to be longer than a couple of sentences).

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