CHEM 101L

CHEM 101L STUDY GUIDE QUESTIONS AND ANSWERS Q1, Density: The volume marking at the sealed bottom of a buret segment is 38.60 mL, and has markings for every 0.1 mL. When water is added, the bottom of the meniscus sits about halfway between the line for 18.3 mL and the next mark up. What volume of water is contained in the buret segment? 38.60mL-18.25mL= 20.35mL Q1, Density: When calculating the displacement volume of the thermometer, the volume reading on the buret is 28.47 mL without the ...

CHEM 101L- EXP. 6 QUESTIONS AND ANSWERS Experiment 6 In this lab, the temperature of three different reactions will be recorded and graphed. The graph will be used to extrapolate the maximum temperature of those reactions , and those temperatures will in turn be used to calculate their enthalpy change. Enthalpy is the total heat content of a system. Negative enthalpy changes indicate an exothermic reaction, as the heat content of the system escapes to its surroundings. Positive enthalpy c...

CHEM 101L QUESTIONS AND ANSWERS Convert measured quantities (mass, volume, etc.) to chemically-relevant quantities (moles, concentration, etc.) as needed in an experiment. M=m/v(L) M1V1=M2V2 Understand how to convert from a mathematical equation to a graph of a linear function and how to use regression data to find terms and constants in the equation. Define and distinguish between random and systematic errors and how they may affect precision and accuracy of experimental results. - Sy...

CHEM 101L FINAL QUESTIONS AND ANSWERS hanging on the side of a bench near the door A small vial of flammable liquid spills and ignites in the hood. Your TA asks you to bring the fire extinguisher while he moves students back from the hood, so you look for the fire extinguisher ____________________. proceed to the safety shower located just inside the door to the hallway, remove both the lab coat and shirt, and rinse your skin for 15 minutes. While carrying a vial of an organic liquid fro...

CHEM 101L-EXP.8 QUESTIONS AND ANSWERS Describe the electronic processes associated with absorption or emission of radiation. Which process is associated with an electron moving to a higher energy level? - gain energy by absorbing light to jump to another level. - When it wants to go back to its natural state it releases a photon - Emission = Higher to lower - Absorption = Lower to higher How the energy level of an electron related to the energy of a photon? They are limited by orbit...

CHEM 101L- EXP. 7 QUESTIONS AND ANSWERS Define Beer's Law verbally and be able to describe the usefulness of this concept in making measurements of chemical species and properties. - tells us how much there is of something - relates absorbency to concentration - defines how strongly the solution being studied absorbs light at a particular wavelength. - This is unique for each different chemical at each different wavelength. - The quantity of light absorbed by a substance dissolved ...

CHEM 101L FINAL QUESTIONS AND ANSWERS Beer's law gives the mathematical relationship between solution concentration and absorbance. According to Beer's law, the experimentally determined values of absorbance (A) are given by multiplying: (Select all that apply) A. ε, the molar extinction coefficient (also called molar absorptivity). B. l, the path length of the cuvette. Cterm-58hoice 3 of 4:C. c, the concentration of the solution. Choice 4 of 4:D. t, the amount of time in the lig...

CHEM 101L SAFETY QUIZ QUESTIONS AND ANSWERS When you read the label on a chemical container, what are the three most important pieces of information? Name, concentration, and hazard warning How many times should you read the information of a chemical container before you open the container? Twice Is it important to be exact when preparing a chemical reaction? Explain Yes, chemicals react differently with different amounts. It may produce unwanted results. What should you do with le...

CHEM 101L QUESTIONS AND ANSWERS Apparel Attire: long well fitting cotton or wool clothing; closed leather shoes, no jewelry, no make up application, no contacts PPE Always wear googles, wear gloves except when leaving the lab and working with electronics/labtop Chemical Safety- -1-label -2-spill -3-acid or water Bunsen Burner Safety- -1-step one? -2-flame goes out? smell gass? -3-chipped glass? -4-how to heat flammable chemicals? Thermometer safety -1-shake it? -2-temp range ...

CHEM 101L EXAM FINAL QUESTIONS AND ANSWERS When should you wear gloves in the laboratory setting? They must be worn at all times when handling glassware and chemicals When should you not wear gloves in the lab setting? gloves must be removed before leaving the lab gloves should be removed when touching computer, or other personal items. gloves should be removed when leaving lab What should you do with loose/long hair/clothing? tie back securely constrained under a lab coat W...