CHEM 104 (CHEM104)

CHEM 104 Experiment 5: Buffers - Portage Learning 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 s...

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...

CHEM 104 Experiment 3 Titrations and Titration Curves - Portage Learning Purpose: The purpose of this to perform titration analyses, including neutralization titrations, which occur between an acid and a base. Procedure: After gathering the necessary supplies, it was decided that we would perform reactions between the following solutions: strong acid/strong base, weak acid/strong base and strong acid/weak base. Standardization titration of NaOH: Used a strong acid/weak base. We determine the mo...

CHEM 104 Experiment 2 Equilibrium Reactions - Portage Learning 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...

CHEM 104 Experiment 1 Kinetics - Portage Learning Title: Kinetics Purpose: The purpose of the first reaction was to vary the concentrations to observe the relationship of concentration and rate of the reaction. The purpose of the second experiment was also to vary the concentrations of hydrogen peroxide and iodine and determine how the rate was affected based on the concentrations. Order of reaction was also discussed and determined in the first and second reactions. The purpose of the third ex...

Chem 104 Unit EXAM QUESTIONS AND ANSWERS 2023 Science - ANS A way of learning about the natural world Describe the Nature of Science - ANS Began when people became skeptical Revising ideas Scientific Method - ANS A series of steps followed to solve problems including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions. 1.3 Technology - ANS Is Applied Science Can be helpful and harmful *fossil fuels have helped us and also hurt us. The...

Chem 104 Exam 1 Practice Questions With Answers metalloids - ANS semiconductors are _______ A) metalloids. B) halogens C) transition elements. D) metals. E) nonmetals. O3 - ANS Which of the following is an element and a molecule? A) Air B) He C) CO2 D) C E) O3 fluorine - ANS The ionization energy of chlorine is lower than the ionization energy of ________. A) calcium B) sodium C) hydrogen D) fluorine E) lithium sugar - ANS Choose the pure substance from the list below. ...

CHEM 104 Final Exam Questions And Verified Correct Answers What can serve as the solvent in a solution? liquid, solid, gas, or all of the above. - ANS all of the above a homogeneous mixture consists of 12% ethanol, 28% methanol, and 60% water. what is the solvent? water, methanol, ethanol, or ethanol + methanol - ANS water in a solution, the solute is: - ANS the substance that is dissolved example of colloid: grape juice, homogenized milk, blood, or kool-aid. - ANS homogenized ...

Chem 104 Exam Questions With Answers From a thermochemical standpoint, the formation of a chemical bond is _____________. - ANS Exothermic The lattice energy of an ionic compound can be calculated using the __________ _____________ ___________ - ANS Born-Haber cycle Atoms of different electronegativity form ________ __________ bonds - ANS Polar covalent ______________ is defined as "the ability to attract electrons to itself in a chemical bond" - ANS Electronegativity Di...