Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
Zing Substances. For ionizing substances, such as NaCl , 1mosm is 1mmole times the number of ions formed when each molecule dissociates. One mmole of NaCl is 58 mg, but when it dissociates, it yields 1 mmole of Na+ (23mg) and 1mmole of Cl ( 35mg). Therefore , 58 mg of NaCl is 2 mOsm of NaCl is put into a beaker and distilled water added to make 1 liter, the osmolarity is 2mOsm/l. A) How many mosm solute will 1 gram of NaCl yield?
Contents Abstract – Page 2 Summary of Results – Page 3 Focus Question – Page 5,6 What if… - Page 6 Confidence Report – Page 7,8 Abstract Summary of Results Observations of Reactions – Trials 1 , 2 & 3 | Dissolving Barium Iodide and Zinc Sulfate in deionized water | As the substances dissolve the water becomes cloudy and acquired a white tint. | Centrifuging up the solution obtained in previous reaction | The precipitate and the liquid seperated, and there was more precipitate in one of the test tubes. The precipitate was a thick white color, not transparent. | Heating the Precipitate in a boiling tube containing 2 boiling chips | The mixture began producing a large amount of bubbles, as we continued heating it only white powder remained. | Observations of Chemicals | Zinc Sulfate | Powder of a white solid | Barium Iodide | Powder of a white solid.
Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color. Solid Zinc Iodide: A very white powdery substance that had several clumps within it. It was also very dry in nature. Mass Table Substance Amount of Mass Measured for Actual Mass Granular Zinc 2.0 grams 1.9 grams Iodine Crystals 2.0 grams 2.1 grams Observation of Reaction Shown below and Included within the lab notes on pages 12 and on page 14. Placing Acetic Acid in Zinc and Iodine test tube After placing the Acetic Acid in a normally unreactive test tube containing Zinc and Iodine, the solution changed to a more orange and then to a more red-brown color.
Which pairs will react from an ionic compound? Chlorine and oxygen Nitrogen and Lithium b. Which pairs will react from a molecular compound? Flour nine and Argon c. Which pairs will not react to form a compound? Aluminium and potassium 7) A certain particle was found to contain sixteen protons and eighteen electrons.
Purpose: To investigate the physical and chemical properties of pure chemical substances. Observations and Experimental Data: Data Table 1: Solubility or Reaction Substance Name Color Odor Effect of Heat Cold H2O Hot H2O Litmus Test Dilute HCl Dilute NaOH Mg Silver odorless nothing bubbles bubbles No color change Bubble,fizz Slightly frothy cloudy No apparent change Cu Copper Odorless Turns darker black No apparent change No apparent change Lighter blue Holes in copper ball bubbles Dark spots on copper Zn Silver Odorless Liquid Solid Solid Lighter blue Bubbles fizzes No apparent change MgO white odorless Dark grey Cloudy Cloudy Lighter blue Fizzed bubbled Cloudy no bubbles CuCO3 green odorless pops Cloudy green h2o dissolved Turns dark green pops Blue-from pink Fizzed dissolved Turns blue Cu(NO3)2 blue odorless Melts boils Light green liquid Dissolved boils Blue-from pink Dissolved green liquid Blue bubbles NaCl white odorless crackesl Grain in h2o no bubbles Stays granular Lighter blue No apparent reaction bubbles Questions: A. Did you observe any chemical changes in this experiment? Yes. B.
Then you put the remaining liquid (neutral component mixture) through the suction filtration funnel to isolate the crystals. After 10-15 minutes, the crystals will be dry and you can weigh them and find their melting point. How is the neutral component of your 3-compound mixture isolated from the final methylene chloride solution? 16 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... Name the four active ingredients that we will be testing for in the TLC of Analgesics lab: Ibuprophen Caffeine Acetaminophen Acetylsalicylic acid What solvent system will you be using to dissolve the common analgesics (power) in preparation for TLC spotting? Methylene chloride: ethanol (1:1 solution) What solvent system will you be using to "develop" your TLC plates in the TLC of Analgesics lab?
Name: Daniel Voskresenskiy Post-Lab Report Lab Name: 68th & Zinc - Lab #6 Course: CHEM106 LB SEC: 052 Date: March 18, 2013 Lab Partner: Justin Nus Observations of Reactants (Table 1) Chemical 0.17 M Acetic Acid Buffer 10 Unknown Zinc Compound Physical Appearance Aqueous; clear; colorless Aqueous; clear; colorless; not viscous Fine; Powdery; White; Solid Chemical Zinc Iodide (ZnI2) Calmagite NaEDTA Physical Appearance Solid; powder; fine; white Aqueous; brown/red; not viscous; opaque Fine; Powdery; White; Solid Procedure - Preparing a Solution of EDTA Before titration, a titrant must successfully be made - the substance that will react with zinc ion. Purpose: To find out how much zinc is a sample of zinc iodide we will react zinc
Table of Contents/Labs Lab # | Title | Page | | Informal Lab Report Procedures & Grading Rubric | 2-4 | 1 | How Many Drops Of Water Can Fit On A Penny? | 5-6 | 2 | Is The Potassium Chloride Mixture Homogeneous or Heterogeneous? | 7 | 3 | What Are The Densities Of Pre- And Post-1982 Pennies? | 8 | 4 | Which Type Of Glassware Is Most Accurate? | 9 | 5 | What Is The Relative Abundance Of Pre- And Post-1982 Pennies In A Sample of 1982 Pennies?
Experiment 6: Physical & Chemical Properties Title and Identifiers: Heating of chemical properties 01/23/15 Purpose / Objective: • To investigate the chemical properties of pure chemical substances • To investigate the physical properties of pure chemical substances Procedural Outline: • Matches • Beaker, 100 mL, glass • Burner-fuel • Goggles-Safety • Stirring rod - Glass • Test Tube(5), 13 x 100 mm in Bubble Bag • Test-tube-clamp-holder • Test-tube-cleaning-brush • Well-Plate-24 • Well-Plate-96 • Litmus Paper, Blue • Litmus paper, Red • Copper (II) Carbonate in Vial, 1/2 Full • Copper (II) Nitrate Crystals in Vial • Copper Metal