Supplemental Instruction Tiffany SiaCHEM 115a [email protected] Reisler www.usc.edu/siWeek 7 (10/1-10/5)Ever wonder why we feel nauseous? While the vomiting reflex is well understood, nausea has beeen a little harder to graspat. Well, scientists studying rats may have come up with the answer! Last week, a study published in the Journal of Neuroscience showed that taking away serotonin in a rat’s insular cortex, a site of taste and illness input to the brain, stopped a “disgust reaction” in rats (they don’t vomit) when tasing something that made them sick in the past, whereas activating serotonin caused it. Interesting, is it not? Naming: 1. In (1) ________________ compounds:a. Metal (___________________) is named first. Base name of (____________________) comes next + the suffix __________.b. We must indicate the ________________ of the cation if it can vary. 2. In (2) __________________ compounds: a. ________________ + name of 1st element + _______________ + name of second element + the suffix __________. 3. Name the following molecules! Or, write out the chemical formula!a. NaNCS – b. CuC2O4 – c. Iron (III) sulfite - d. Hydrosulfuric acid – e. Sn(CN)4 – f. P4O10 – g. Mn2O4 – Oxidation Numbers: Review the rules. 4. Write out the oxidation numbers for the atoms in the following compounds, and name them, too!a. Mn2O7b. WCrO4c. SiO2d. NaClOMolarity & Dilutions5. Calculate the molarity of a solution that contains 3.6 g of HCl in 200 mL of solution.Supplemental Instruction Tiffany SiaCHEM 115a [email protected] Reisler www.usc.edu/sia. What would the new concentration be if you added 500 mL of water to the original solution?6. Find the [Cl-] in a solution prepared by mixing 259. mL of a 0.357 M solution of AlCl3 with 241. mL of a 0.456 M solution of KCl. Acid Base Reactions7. How much 3.0 M NaOH would you need to add to neutralize the HCl solution from part A?8. You have 0.313 g of an unknown acid with 2 acidic protons, H2A. The acid requires 36.04 mL of 0.509 M NaOH to completely neutralize the acid. Find (A) the molar mass of the acid, and (B), the identity of A. Precipitation Problems 9. Magnesium nitrate and magnesium chloride are dissolved completely in water. Next, silver nitrate is added to the solution until precipitate formation is complete. The laboratory techs found the mass of the precipitate formed to be 0.641 g. (MM AgCl = 143.55 g/mol)a. Give the balanced molecular equation for the reaction of magnesium chloride with silver nitrate. b. Give the net ionic equation.c. How many moles of magnesium chloride were present in the original mixture?Supplemental Instruction Tiffany SiaCHEM 115a [email protected] Reisler
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