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CHEMISTRY SOL 4 REVIEW

CHEMISTRY SOL 4 REVIEW. UNIT 9 – Molar Conversions. Calculate the following: 0.35 mol F = _________ atoms F 3.25 moles CO 2 = ________molecules 2.6 moles Cu = _______ g Cu 4.23 g NaCl = ________ moles NaCl. 2.11 x 10 23. 1.96 x 10 24. 165.23. 0.07. 2009 SOL question.

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CHEMISTRY SOL 4 REVIEW

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  1. CHEMISTRY SOL 4 REVIEW

  2. UNIT 9 – Molar Conversions • Calculate the following: • 0.35 mol F = _________ atoms F • 3.25 moles CO2 = ________molecules • 2.6 moles Cu = _______ g Cu • 4.23 g NaCl = ________ moles NaCl 2.11 x 1023 1.96 x 1024 165.23 0.07

  3. 2009 SOL question • The number of molecules in 48.0 g of oxygen gas (O2) is – • A 6.02 x 1023 • B 9.03 x 1023 • C 1.20 x 1024 • D 1.81 x 1024

  4. UNIT 9 – Molar Conversions • At STP, 1 mole of any gas occupies ______ Liters • 22.4 • What is the volume of 7.3 g of CO2 at STP? • 3.72 L • Find the density of O2 gas at STP. • 1.43 g/L

  5. 2009 SOL question • What is the volume occupied by 51 g of NH3 gas at STP? • F 0.439 L • G 22.8 L • H 67.2 L • J 91.9 L

  6. UNIT 10 - Stoichiometry • What is the mole ratio of Al:Br in the following equation? 2Al (s) + 3Br2 (l)  2AlBr3 (s) •  2:3 • How many moles of O2 are produced when 2.35 moles of CO2 break down? CO2 C + O2 • 2.35 moles

  7. UNIT 10 - Stoichiometry • LiOH + HBrLiBr + H2O If you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced? • 36.25 g • 2SO2 + O2 2SO3 What is the limiting reactant if you have 0.25 moles of each reactant? • SO2

  8. 2009 SOL question • If a student starts with 21.7 g of NH3, how many grams of hydrogen (H2) gas will be produced by the reaction? 2NH3 N2 + 3H2 3.85 g

  9. UNIT 10 - Stoichiometry • LiOH + KCl  LiCl + KOH • I began this reaction with 20 grams of LiOH and produced 31 g of LiCl. What is my percent yield? • Theoretical = 35.4 g • Percent Yield = 87.6%

  10. UNIT 11 – Gas Laws • Increasing the number of particles will ____________ the pressure of a gas. •  Increase • Increasing volume will ________ the pressure of a gas. •  Decrease • Decreasing the temperature will _______________ the pressure of a gas • Decrease

  11. UNIT 11 – Gas Laws • Draw a graph to show the relationship of volume and pressure.

  12. UNIT 11 – Gas Laws • What’s the partial pressure of oxygen in a balloon filled with O2 and N2 if the total pressure in the balloon is 810 mmHg and the partial pressure of N2 is 610 mmHg? • 200 mmHg

  13. UNIT 11 – Gas Laws • When using any of the gas laws, what unit must you use for TEMPERATURE? •  Kelvin • If we took 2.00 liters of a gas at 1.00 atm and compressed it to a pressure of 6.00 x 104atm, what would the new volume of that gas be? • P1V1 = P2V2 • 3.33 x 10-5 L

  14. UNIT 11 – Gas Laws • If a balloon initially has a volume of 0.4 liters and a temperature of 20oC, what will the volume be after it is heated to a temperature of 250oC? • V1/T1 = V2/T2 • 0.71 L

  15. UNIT 11 – Gas Laws • If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87oC, how many moles of gas do I have? • PV = nRT R = 0.0821 • n = 1.26 moles

  16. UNIT 12 - Solutions • What units do we use when measuring molarity (M)? •  moles/L • How many moles of HCl are needed to make 675 mL of a 2.0 M solution? • 1.35 moles

  17. UNIT 12 - Solutions • In terms of solubility, polar substances tend to dissolve in _______________ substances. •  Other polar • Why won’t oil and water stay mixed? •  Oil is nonpolar, water is polar  • List two ways you can speed the dissolving process. •  Stirring, Heating 

  18. UNIT 12 - Solutions • Which salt is most soluble at 10oC? •  KI • How many grams of KCl can be dissolved in 200 g of water at 80oC? • 100 g KCl

  19. UNIT 12 - Solutions • Adding salt to ice or water alters it by _____________ the freezing point. • Lowering/depressing • 2.0 L of a 0.88 M solution is diluted to 3.8 L. What is the new molarity? • M1V1 = M2V2 • 0.46 M

  20. UNIT 13 – Everything Else • How is molar heat capacity different from specific heat capacity? •  Molar heat capacity talks about raising the temp of 1 mole, specific heat is 1 gram • How many joules of heat are given off when 120 grams of water are cooled from 25oC to 10oC? The heat capacity of ice is 2.09 J/goC. • Q = mc T • Q = 3762 J

  21. UNIT 13 – Everything Else • What kind of chemical would you use to neutralize an acid spill in a lab? •  Base (Ammonia, Sodium bicarbonate) • What is the pH of a 0.1 M solution of a strong acid? •  1 • What is the pH of a 0.36 M solution of the strong base NaOH? • 13.55

  22. UNIT 13 – Everything Else • What does pH measure? • Concentration of hydrogen ions • If a substance has a pH of 3, what is its pOH? • 11

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