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5/14/12

5/14/12. Turn in your exam reviews. Ch 15 Questions. Draw the structure of a water molecule. Is water polar or nonpolar? WTDB a hydrogen bond and a normal bond? How many hydrogen bonds can one hydrogen make? What is the shape of water?

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5/14/12

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  1. 5/14/12 Turn in your exam reviews.

  2. Ch 15 Questions • Draw the structure of a water molecule. • Is water polar or nonpolar? • WTDB a hydrogen bond and a normal bond? • How many hydrogen bonds can one hydrogen make? • What is the shape of water? • How does hydrogen bonding affect surface tension, vapor pressure, and boiling point?

  3. Why does ice float in water? • What is a surfactant? • WTDB solution, solvent, and a solute? • What type of solution conducts electricity? • What kind of solution will dissolve a polar solute? • Why is water called the universal solvent? • WTDB a strong and weak electrolyte? • What is a hydrate?

  4. What is an anhydrous substance? • WTDB a suspension and a colloid? • What is the Tyndall effect? • Write out the formula for: Magnesium Sulfate Pentahydrate Nitrous Acid Calcium Hydroxide

  5. Ch 16 • What factors affect the rate of dissolving? • What are the three level of solubility in a substance that can be dissolved? • What do you call something that can not be dissolved? • What is the unit for solubility of a solute? • What factors affect the solubility of a gas? • What is the main way to calculate concentration?

  6. What is the formula for molarity? • If you put 0.2 moles of solute into a solution with a volume of 500 mL – what is the molarity? • A 1.0 M solution with a volume of 200 mL – how many moles of solute are in the solution? • What is the concentration/dilution formula? • If you want to dilute an 50 mL of 8M solution of acid to a safer level at .5M what does its new volume need to be?

  7. 12. What are the two percent solutions? • If you get 500 mL of rubbing alcohol that is 80% by volume. How many mL are alcohol and how much water? • If you put 40 grams of NaCl into an aqueous solution with final volume of 300 mL. A) what is the solvent? B) what is the molarity? C) what is the percent by mass? 15. How can a solute affect a solution?

  8. Ch 17 • WTDB heat and temperature? • What is the general formula for heat? • How does heat transfer? • What are the two types of thermo reactions? • Besides temperature difference where can heat energy come from? • WTDB heat capacity and specific heat capacity?

  9. What are the two types of calorimeters? • If one object gains 500 J then how much did the other object change? • If you add 1,000 J of energy to 50 grams of water (c = 4.18 J/g.C) – what is the temperature change? • Write the net ionic equation for hydrochloric acid dissociating in water with a ΔH = -500 kJ A) Is this exothermic? B) How much heat is released with 2.5 moles? C) How much heat is absorbed in the reverse?

  10. 11. What are the names of the state changes? • Which are endothermic? Exothermic? • If you have 50 g of ice at -10 degrees and 100 grams of water at 0 degrees – what is going to happen? • Does temperature change during a state change? • How are heat of fusion and solidification related?

  11. Ch 19 • What makes something an acid or base by Arrhenius’s definition? • Be able to name Arrhenius acids and bases. • What is the name of the reaction between acids and bases? Products? • How do you calculate pH and pOH? • What do you get when you add the pH and pOH of a substance together?

  12. 6. A substance 0.9M has [H] of 3.5 x 10^-5 M when it dissociates in water: A) what is pH B) what is pOH C) [OH] D) acid, base, neutral E) K 7. WTDB a strong and a weak acid?

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