CHEM 121 Study guides, Class notes & Summaries

Title: Quantitative and Qualitative Analysis Purpose: The purpose of this experiment is to learn how to measure the amount of a substance that is present in a chemical compound. A metal carbonate will be analyzed to determine how much CO2 and moles of CO2 are lost. Another experiment will also look into how much water a hydrate loses and determine what type of hydrate it is. Paper chromatography will be used to determine the identity of chemical substances. Lastly, SEM/EDX will be used to d...

Title: Organic Synthesis Purpose: In this lab, three carbon based organic compounds were synthesized to determine their true purity. The experiments were done to learn about how to use these compounds’ melting points and infrared spectroscopy to determine their percent yield. Procedure: Experiment 1: Making Acetylsalicylic Acid (aspirin) 1. Obtain a flask. 2. Weigh 2 grams of salicylic acid. 3. Put the 2 grams of salicylic acid into the flask. 4. Put 5 mL of acetic anhydride into a gr...

CHEM 121 STRUCTURAL CHEMISTRY WITH APPLICATION TO CHEMISTRY OF THE ELEMENTS EXPERIMENT 3 OVERVIEW UNIVERSITY OF BRITISH COLUMBIA

Chem 121 Lab Exam With Complete Solutions Define a monomer. - Correct Answer molecules that bond to form polymers. Define a polymer. - Correct Answer macromolecules that are made of many monomers. A cation has a smaller radius than its neutral atom because it loses valence electrons. - Correct Answer True Which has a larger radius; Al- or Al 3+? - Correct Answer Al- Sodium polyacrylate - Correct Answer Absorbs 100-1000 times it mass in water, used in diapers, medical bandages, ...

CHEM 121L FINAL Exam With Correct Answers SAFETY IN THE LAB: 1. Splash proof safety goggles must be worn when working in the First Year Chemistry Laboratory because: (Select all that apply:) - The number of students working in the lab increases the chances of collision and subsequently chemical splashes - User inexperience increases the chance of splashes and chemical spills - They provide maximum protection from chemicals spilled or splashed in the eyes - They provide protection from fly...

Show the determination of the charge on the ion formed by the Mg12 atom. Mg has a +2 charge S 2S 2P 3S also you can just look at the periodic table and see that it is in collumn 2 on the left side and would know that it has a +2 charge because the 2 columns on the left are + this is day 1 chem 101 knowledge 12 2 2 6 2 Mg (metal = lose electrons) 1s 2s 2p 3s lose 2e → Mg 12 2 2 6 2 +2 Ques 10 / 10 pts tion 2

In the reaction of gaseous N O to yield NO gas and O gas as shown below the following data table is obtained: 2 N O (g) → 4 NO (g) + O (g) 2 5 2 2 2 5 2 2 Your Answer: Data Table #2 Time (sec) [N O ] [O ] 0 0.300 M 0 300 0.272 M 0.014 M 600 0.224 M 0.038 M 900 0.204 M 0.048 M 1200 0.186 M 0.057 M 1800 0.156 M 0.072 M

Experiment # 9 Inorganic Synthesis Purpose: Inorganic Synthesis of three compounds: Alum, Calcium carbonate, and Zinc Iodide. Procedure: Alum Place 1g of scrap aluminum into a flask. Using a graduated cylinder, measure out and add 50 ml of potassium hydroxide. Note reaction. Place under hood and heat on a hot plate. Note color of solution. Cool flask in a large beaker of water. Measure 30 ml of sulfuric acid and add to flask. Note precipitation formation. Heat solution until precipitatio...

Experiment # 6 Measuring Kc and Shifting Chemical Equilibria Purpose: To study the equilibrium reaction by 1) determination of the equilibrium constant, Kc. 2) Shift equilibrium, Le Chatelier’s principal. Procedure: A. Measuring Equilibrium Constant 1) Mix 10ml each of acetic acid and n-propyl alcohol in a small flask. Place 1 ml sample of mixture into a beaker using a pipette. Add 25ml of water and several drops of phenolpthalein. Titrate NaOH into beaker. Note color changes and stop ...

Title: Bonding Type by Solubility, Distillation, and Spectroscopy Purpose: In this lab, we will study the bonds that form between molecules. We learn about the Infrared Spectra and physical properties of molecules to determine what kinds of intramolecular bonds are present within the molecules and what kinds of inter-molecular bonds are present between the molecules. Procedure: There are several different types of bonds – Hydrogen bonds, Polar bonds, and Nonpolar substances that form ver...

Experiment # 5 Bonding Type by Solubility, Distillation, and IR Spectroscopy Purpose: Different methods to identify inter and intramolecular bonding types. Procedure: A. Solubility 1) Place sample of KCl into a test tube filled with water. Take note of any layers separating the water with the added material. Mix the materials together in the test tube. Note if the mixture is homogenous or remains separated. 2) Repeat the process each for pentane, n-propyl chloride, ethyl alcohol, n-butyl...

Experiment # 4 Reaction Chemistry Purpose: Review chemistry reactions and their properties Procedure: I. A. Double Displacement reactions 1) Fill one test tube with AgNO3 and another tube with HCl. Carefully pour one solution into the other tube back and forth to mix solutions. Note the color change. 2) Repeat the previous steps with one tube of Pb(NO3)2 and KI. B. Acid-Base (Double Displacement) Reaction 1) Take one test tube of HCl and one tube of NaOH and measure each solution. Mix t...