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Weak, Strong and Nonelectrolytes

Weak, Strong and Nonelectrolytes. Woohoo Chemistry!!!. Agenda. -Attendance - Hand back all stuff -Hand out Cheat sheets -Review: Go over homework questions. -Solubility chart - Notes on Weak and Strong electrolytes with equations.

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Weak, Strong and Nonelectrolytes

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  1. Weak, Strong and Nonelectrolytes Woohoo Chemistry!!!

  2. Agenda -Attendance - Hand back all stuff -Hand out Cheat sheets -Review: Go over homework questions. -Solubility chart -Notes on Weak and Strong electrolytes with equations. -Demo with different types of solutions and electricity -Give Vocabulary Words -Review Videos Links -Go over the test -Question period (including go over some and hand in your questions that you created)

  3. Review: Homework questions • Vultures are a type of bird that is able to eat rotting meat because of extremely strong gastric juices. These gastric juices are actually aqueous solutions. What is an aqueous solution? • When too many restaurants open in the same neighborhood, you may hear people say that the market for restaurants is saturated. Explain what is meant by this statement and relate it to saturated solutions. • What is a saturated solution? Unsaturated solution? Supersaturated solution? • What the difference between electrolyte and nonelectrolyte? • Come up with two different questions that could be asked on an exam and the answers to those questions

  4. Solubility Chart • How do I read this thing? • Negative ion first • Positive ion second

  5. Electrolytes • Electrolyte- dissolves in water, breaks up into ions and conducts an electric current. • Nonelectrolyte- dissolves in water, does not break up into ions, therefore not conducting electricity NaCl Example in water Vs Sugar in water

  6. Strong and Weak Electrolytes • Strong Electrolyte: A substance that is completely ionized in solution. Ex. Strong acids, Strong bases and most salts. • Weak Electrolyte: A substance that only party ionizes in solution. Example Ethanol and Chloroform.

  7. Weak and Strong Electrolytes • H20 (l)  H + (aq) + OH- (aq) • NaCl (s)  Na+(aq) + Cl- (aq) • C12H22O11 (s)  C12H22O11 (aq) • HCl (l)  H + (aq) + Cl- (aq) • CH3COOH  CH3COO- (aq) + H + (aq) • CuSO4  Cu 2+ (aq) + SO42- (aq) • NH3 (g) → NH4+ (aq) not going to try this one

  8. Demo H20 (l) --> H + (aq) + OH- (aq) NaCl (s) --> Na+(aq) + Cl- (aq) C12H22O11 (s)  C12H22O11 (aq) HCl (l)  H (aq) + Cl (aq) CH3COOH  CH3COO (aq) + H (aq) CuSO4  Cu (aq) + SO4 (aq) H+ + NH3 → NH4+ • Salt (strong), Sugar C12H22O11(non elec), Copper (II) sulfate (strong), HCl (strong), ethanol(nonelectrolyte), Acetic acid and ammonium (weak).

  9. Strong Acids HCl- hydrochloric acidHBr - hydrobromic acidHI - hydroiodic acid (also known as hydriodic acid) HNO3 - nitric acidH2SO4 - sulfuric acidHClO4 - perchloricacid HClO3-chloric acid

  10. Strong Bases LiOH lithium hydroxide NaOH sodium hydroxide KOH potassium hydroxide RbOH rubidium hydroxide CsOH cesium hydroxide Ca(OH)2 calcium hydroxide Sr(OH)2 strontium hydroxide Ba(OH)2 barium hydroxide

  11. Vocabulary mixture / compound define both terms and list the key differences between a mixture and a compound. give an example of each homogeneous / heterogeneous mixtures solutions are which type of mixture? Colloids / Suspensions / Solutions / Tyndall effect aqueous solutions solute / solvent define both terms. Give at least one specific examples of solutions involving: gases dissolved in other gases; liquids dissolved in other liquids; solids dissolved in liquids. Identify the solute and solvent in each case soluble / insoluble solubility unsaturated / saturated / supersaturated how can you prepare a supersatured solution? electrolyte / nonelectrolyte (or electrolytic solution / nonelectrolytic solution) What causes the one type of solution to conduct electricity, while the other one does not? Polar / Nonpolar / Ionic Define each. What’s the difference between each? Which solutes will dissolve in which solvents?

  12. Videos Having trouble with the difference between suspensions and colloids watch some videos: • http://www.youtube.com/watch?v=Ti0QroYDta8 Colloids suspension solution • http://www.youtube.com/watch?v=AlrqitFCNLw suspension colloid demos • http://www.youtube.com/watch?v=bn1-Zgcpp_4 Colloids Strong Weak and Nonelectrolytes Video with demos if your having trouble: http://www.youtube.com/watch?v=Pxegf2KKiuc

  13. What's on the exam/ Question Period

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