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Date: March 8, 2010 Objective: We will learn how to calculate the concentrations of solutions.

Learn how to calculate concentrations of solutions and gain knowledge about DNA structure, replication, and information storage. Practice examples included.

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Date: March 8, 2010 Objective: We will learn how to calculate the concentrations of solutions.

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  1. Date: March 8, 2010 • Objective: We will learn how to calculate the concentrations of solutions. • Do Now: • Think of a solution. What is the solute and what is the solvent? • What is a hydrogen bond? (should be in your notes)

  2. Mini-Test Friday Worth a Major Grade

  3. DNA

  4. DNA • Deoxyribonucleic Acid • Discovered by Watson and Crick • Location: in chromosomes in the nucleus • Shape: a double helix • Has 3 parts: • 1) base (A, T, G, or C) • 2) sugar molecule • 3) phosphate group

  5. 1 nucleotide

  6. How DNA Stores Info • Humans have 46 chromosomes per cell • A only pairs with T • G only pairs with C • The sequence is the genetic code

  7. DNA Replication

  8. Concentration

  9. Concentration • Measures the amount of solute in a given amount of solvent or solution • Units: gmol L L

  10. Molarity • The number of moles of solute in one liter of solution • Units: (moles of solute) (L of solution) • Example: • You have 3.50L of solution that contains 90.0 grams of sodium chloride, NaCl. What is the molarity of the solution?

  11. Example • You have 0.8L of a 0.5M HCl solution. How many moles of HCl does this solution contain?

  12. Molality • The number of moles of solute per kg of solvent • Units: (moles of solute) (kg of solvent) • Example: • A solution was prepared by dissolving 17.1 g of sucrose (table sugar, C12H22O11) in 125g of water. Find the molal concentration of this solution.

  13. Example • A solution of iodine, I2, in carbon tetrachloride, CCl4, is used when iodine is needed for certain chemical tests. How much iodine must be added to prepare a 0.480 m solution of iodine in CCl4 if 100.0g of CCl4 is used?

  14. Exit Slip • 1) What is the molarity of a solution of 14.0g of NH4Br in enough H2O to make 150mL of solution? • 2) A solution is prepared by dissolving 17.1 grams of sucrose, C12H22O11 ,in 275g of H2O. What is the molality of the solution?

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