Chem 104 experiment Study guides, Class notes & Summaries

Experiment #: 5 Title: Buffers Purpose: The purpose of this lab is to determine how buffers affect the pH of a solution in order to observe how a buffer is resistant to pH changes. Additionally, we determined how enzymes activity is affected by pH. Procedure: Part 1: Determine pH of sodium acetate in water & buffer 1. 2 pH electrodes are place in 2 separate beakers, one filled with tap water & one is filled with a pH 7 buffer (both have an approximate pH of 7) 2. A scoop of sodium aceta...

Experiment #: 4 Title: Molarity of Vitamin C Purpose: The purpose of this lab is to determine a better understand of solutions and concentrations relating to vitamins, specifically vitamin C or ascorbic acid. In order to do so, we measured the vitamin C in a few different fruits to determine the concertation of vitamin c in each. Procedure: Part 1: Determining the vitamin c concentration of iodine 1. Iodine was placed in a buret. 2. A solution was made from the commercial vitamin C by w...

CHEM 104 Experiment 4: Molarity of Vitamin C - Portage Learning Purpose: The purpose of this lab is to determine a better understand of solutions and concentrations relating to vitamins, specifically vitamin C or ascorbic acid. In order to do so, we measured the vitamin C in a few different fruits to determine the concertation of vitamin c in each. Procedure: Part 1: Determining the vitamin c concentration of iodine 1. Iodine was placed in a buret. 2. A solution was made from the commercial vit...

Experiment #: 2 Title: Equilibrium Reactions Purpose: The purpose of this experiment is to evaluate and study the equilibrium by measuring the equilibrium constant. Procedure: We performed 2 different experiments: o Determination of the equilibrium constant Kc o Study of LeChatelier’s principle Experiment #1: acetic acid vs. propyl alcohol 1. Summary: After gathering supplies, we created a solution of acetic acid and propyl alcohol in a small flask. At various time intervals, we then...

Experiment #: 7 Title: Organic Synthesis Purpose: The purpose of this lab was to determine the process of synthesizing various carboncontaining organic products including aspirin, urea, & salicylic acid. In doing so, we were also able to calculate the percent yield in each of these experiments. Procedure: Part 1: Synthesis of aspirin 1. Placed 2.0 g of salicylic acid & placed it in a flask 2. 5.0 mL of acetic anhydride was then added to the flask & mixed 3. 5 drops of sulfuric acid was a...

Experiment #: 6 Title: Electrochemistry Purpose: The purpose of this lab was to study how redox reactions occur & to determine how conductivity can occur between metals & how we can predict if it will react or not. Procedure: Consider: Cu2+ + 2e- -> Cu(s) = reduction Fe(s) -> Fe2+ + 2e- = oxidation Part 1: 1. Utilizing a lightbulb device, we tested the conductive of the following items: a. Metal cylinder  good conductor (bright light) b. Water  poor conductor (no light) c...

Experiment #: 8 Title: Urinalysis Purpose: The purpose of this lab is to carry out several experiments to evaluate the chemical makeup of a simulated urine sample. Procedure: Part 1: Chloride (Cl- ) 1. Prepare a mixture of AgNO3(silver nitrate) & Cl- solutions 2. These are both colorless solutions 3. Combine the solutions & note how they turn cloudy & form a white precipitate Part 2: Phosphate (PO3 -3) 1. Prepare a mixture of PO4 & (NH4)2MoO3 (Ammonium dimolybdate) solutions 2. Add ...

CHEM 104 MODULE 1- MODULE 6 EXAM 2022/2023 100%CORRECT QUESTIONS AND ANSWERS - PORTAGE LEARNING. Portage Learning CHEM 104 Module 1 Exam: Question 1 In the reaction of gaseous N2O5 to yield NO2 gas and O2 gas as shown below, the following data table is obtained: → 4 NO2 (g) + O2 (g) 1. Using the [O2 ] data from the table, show the calculation of the instantaneous rate early in the reaction (0 secs to 300 sec). 2. Using the [O2 ] data from the table, show the calculation of the instan...

CHEM 104 MODULE 1- MODULE 6 EXAM 2022/2023 100%CORRECT QUESTIONS AND ANSWERS - PORTAGE LEARNING. Portage Learning CHEM 104 Module 1 Exam: Question 1 In the reaction of gaseous N2O5 to yield NO2 gas and O2 gas as shown below, the following data table is obtained: → 4 NO2 (g) + O2 (g) 1. Using the [O2 ] data from the table, show the calculation of the instantaneous rate early in the reaction (0 secs to 300 sec). 2. Using the [O2 ] data from the table, show the calculation of the instan...

CHEM 104 MODULE 1- MODULE 6 EXAM 2022/2023 100%CORRECT QUESTIONS AND ANSWERS - PORTAGE LEARNING. Portage Learning CHEM 104 Module 1 Exam: Question 1 In the reaction of gaseous N2O5 to yield NO2 gas and O2 gas as shown below, the following data table is obtained: → 4 NO2 (g) + O2 (g) 1. Using the [O2 ] data from the table, show the calculation of the instantaneous rate early in the reaction (0 secs to 300 sec). 2. Using the [O2 ] data from the table, show the calculation of the instan...