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Final Jeopardy

Final Jeopardy. Subterm 2 Gases* Solutions* Equilibrium* Acids & Bases* Thermochemistry* Nuclear Chemistry*. Gases 100. Pressure decreases. According to Boyle’s Law, as volume increases what does pressure do? (increase, decrease or no change). Gases 200. Directly related.

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Final Jeopardy

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  1. Final Jeopardy Subterm 2 Gases* Solutions* Equilibrium* Acids & Bases* Thermochemistry* Nuclear Chemistry*

  2. Gases 100 Pressure decreases According to Boyle’s Law, as volume increases what does pressure do? (increase, decrease or no change)

  3. Gases 200 Directly related According to Charles’ Law, how are temperature and volume related– inversely or directly?

  4. Gases 300 Temperature, Volume and Pressure The combined gas laws incorporates what three properties of a gas?

  5. Gases 400 V = (1.66 mol) (0.0821 L·atm/mol·K)(413 K) (2.39 atm) V = 23.6 L What volume would 50.0 g of ethane, C2H6, occupy at 140 ºC under a pressure of 1820 torr? (R = 0.0821 L-atm/moles-K)

  6. Gases 500 Under the same conditions of temperature and pressure, how many times faster will hydrogen effuse compared to carbon dioxide?

  7. Solutions 100 What three operations makes a substance dissolve faster in a solvent? Heating Agitation/stirring Smaller surface area/particle size

  8. Solutions 200 If the solubility of a particular solute is 10g/100g H2O at 20C, what solution concentrations would represent a supersaturated aqueous solution of that solute? 5g/100g H20 20g/200g H20 25g/300g H20 55g/500g H20

  9. Solutions 300 What is the molarity of a solution that contains 6 moles of solute in 2 liters of solution? 6mol/2L = 3M

  10. Solutions 400 What mass of sucrose, C12H22O11, is needed to make 500.0 mL of a 0.200M solution? 0.200M = x/0.500L X = 0.1mol x (342g/mol) = 34.2 g

  11. Solutions 500 To 205 mL of a 0.75M solution of KI, a student adds enough water to make 1.5 L of a more dilute KI solution. What is the morality of the new solution? M1V1 = M2V2 M2 = 0.10 M

  12. Equilibrium 100 What is the expression for Keq for this reaction? 2H2O(g)  2H2(g) + O2(g)

  13. Equilibrium 200 Calculate the equilibrium constant for the production of MgO when the equilibrium concentrations are 0.030M of Mg, 0.020M for O2, and 2.0 M for MgO?

  14. Equilibrium 300 In an endothermic reaction at equilibrium, what is the effect of lowering the temperature? The system will shift toward to reactants (to the left) and more reactants will be made.

  15. Equilibrium 400 What is the effect of adding more hydrogen gas in the following equilibrium reaction? C2H2(g) + H2(g)  C2H4(g) More products will be made (the system will shift right)

  16. Equilibrium 500 How does a decrease in pressure affect the following reaction? C2H2(g) + H2(g)  C2H4(g) The system will shift towards the left (or the reactants)

  17. Thermo 100 What does entropy measure? The amount of chaos (disorder) in a system

  18. Thermo 200 • How much energy is needed to heat 164.5 g ice at -27.6oC to 0.00oC? 9,490 J

  19. Thermo 300 What physical state of carbon dioxide has the highest entropy (solid, liquid, or gas)? GAS

  20. Thermo 400 • How much heat is absorbed by a 15.5 g piece of gold as it is heated from 4.5°C to 177.4°C? (the specific heat of gold is 0.129 J/g°C) • q = mct • q = (15.5g)(0.129 J/g°C)(172.9 °C) • q = 346 J

  21. Thermo 500 Calculate the H for this reaction:C2H4(g) + H2(g)  C2H6(g) (H f for C2H4(g) = 52.5 kJ/mol; Hf for C2H6(g) = -84.7 kJ/mol)

  22. Acids & Bases 100 When an acid reacts with a base, what two types of compounds are formed? Salt and Water

  23. Acids & Bases 200 If the [H+] in a solution is 1 x 10-1 mol/L, what is the [OH-]? 1x10-13mol/L

  24. Acids & Bases 300 If the pH is 4, what is the concentration of hydrogen ion? 1x10-4M

  25. Acids & Bases 400 What is an acid according to Arrhenius? Gives off hydrogen ions in solution

  26. Acids & Bases 500 • What does a buffer do? A buffer helps keep the pH of a solution stable

  27. Nuclear 100 • 1. The half-life of radon-222 is four days. After how many days is the amount of radon-222 one-eighth of its original amount? 12 days

  28. Nuclear 200 • 1. What particle is needed to complete this nuclear reaction?

  29. Nuclear 300 What particle is needed to complete this reaction?

  30. Nuclear 400 A piece of wood found in an ancient burial mound contains only one-fourth as much carbon-14 as a piece of wood cut from a living tree growing nearby. If the half-life (t1/2) for carbon-14 is 5730 years, what is the approximate age of the ancient wood? 11,500 years

  31. Nuclear 500 • Nitrogen-13 decays to carbon-13 with a half-life of 10.0 minutes. Assume that you are given a starting mass of 2.00 grams of nitrogen-13. How many grams of nitrogen-13 will remain after 42.7 minutes? 0.104 grams

  32. Final Jeopardy is next • Teams, place your bets • You may bet between 0 pts - max points you have. • Each team will need to write down their final answer and bring it up for the judges to score. • You have as much time as you need (within reason)

  33. Final Jeopardy • How much energy is needed to heat a 42.3 g sample of ice at –35.7°C to steam at 112.0°C? 132 kJ

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