1. End-Quarter 1 Test Review

2. Identify which number step is the rate-determining step. Step 3

3. A system absorbs 105 kJ of heat from its surroundings while doing 29 kJ of work on the surroundings. Calculate Δ E. 76 kJ

4. 2 H 2 (g) + O 2 (g) → 2 H 2 O(g) If hydrogen is burning at a rate of 0.85 mol/s, what is the rate of consumption of oxygen? 0.43 mol/s

5. 2 Mg(s) + O 2 (g) → 2 MgO(s) Δ H = -1204 kJ How many grams of MgO are produced during an enthalpy change of -96.0 kJ? 6.43 g MgO produced

6. NH 4 + (aq) + NO 2 - (aq) → N 2 (g) + H 2 O(l) Write the rate law for this reaction. Rate = k [NH 4 + ] [NO 2 − ]

7. +726.5 kJ (reverse rxn, reverse sign)

8. NH 4 + (aq) + NO 2 - (aq) → N 2 (g) + H 2 O(l) Calculate the value of k. Include appropriate units. 2.7 x 10 -4 L/mol · s

9. Decrease (smaller negative); vaporization is an endothermic process, thus adding a positive value to the current enthalpy

10. NH 4 + (aq) + NO 2 - (aq) → N 2 (g) + H 2 O(l) What would the rate be when [NH 4 + ] is 4.00 M and [NO 2 − ] is 2.00 M? 0.0022 mol/L · s

11. When a 9.55-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 23.6 ° C to 47.4 ° C. Calculate the Δ H soln in kJ mol -1 for the process. Assume the specific heat of the solution is 4.18 J g -1 ° C -1. q cal = 10.9 kJ; Δ H soln = -45.7 kJ/mol

12. NH 4 + (aq) + NO 2 - (aq) → N 2 (g) + H 2 O(l) Using experiment #1, how long would it take in minutes until 0.050 M NO 2 - remained? 86 min

13. H 2 (g) + F 2 (g) → 2 HF(g) Δ H = -537 kJ C(s) + 2 F 2 (g) → CF 4 (g) Δ H = -680 kJ 2 C(s) + 2 H 2 (g) → C 2 H 4 (g) Δ H = +52.3 kJ Calculate the Δ H for the reaction of ethylene with F 2 : C 2 H 4 (g) + 6 F 2 (g) → 2 CF 4 (g) + HF(g) 2,390 kJ (2,381.7 kJ)

14. What happens to the probability of an elementary reactions as its molecularity increases? Explain. The probability decreases; less likely to 1) collide with 2) proper orientation and 3) sufficient energy

15. Write a balanced thermochemical equation for the formation of NH 4 NO 3 (s).

16. How many intermediates are formed in this reaction? Two

17. Which color line represents the highest temperature? purple

18. Question Answer