Introduction to Chemistry Laboratory_2023

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Table 1: Standard Curve for Bradford Method. Absorbance measured at 595 nm Concentration of BSA Stock solution is 200 ug/mL Amount of protein in tube (ug) O ug Volume of Volume of BSA Absorbance Bradford reagent 3000 µl 3000 µl 3000 µl 3000 µl 3000 µl 3000 µl Cuvette no. Standard 0.00 O ul 30 µl 60 μl 90 μl 120 µl 150 µl В 0.1435 1 0.2968 2 0.402 3 0.5038 4 0.587

Question 35

Prelab1 Please help with 1-3

Table 1. Data on EDTA Standardization Weight of CaCO3 (g): 0.2003g Trial Volume of EDTA (mL) Molarity of EDTA (M) 1 8.60 2 8.50 8.55 Average Molarity of EDTA (M)

Please find standard de

MRI machines primarily work using ____.a. The nuclei of carbons in fatty acid chainsb. The nuclei of oxygen atoms from water molecules in the bodyc. The nuclei of hydrogen atoms from water molecules in the bodyd. The nuclei of radioactive isotopes injected into the body

15. Why are safety data sheets important? SELECT ALL

Lab Data / Calculations Identity of Unknown Mass (g) of Unknown and weighing paper Mass (g) of weighing paper following transfer Mass (g) of Unknown A used Initial mass (g) of Mg used (approximate) Mass (g) of filter paper (before use) Mass (g) of dried filter paper and isolated Cu Show Transcribed Text Initial mass (g) of Mg used (approximate) Mass (g) of filter paper (before use) Mass (g) of dried filter paper and isolated Cu Mass (g) of recovered Cu metal %by weight of Cu in Unknown A A Edit Answer 3,35 Edit 2.25 Edit Try 1: X 1.0972 Try 2:11 55 Info 1040 0.48 Edit 0.32 Edit 0.42 Edit 0.48 Edit 0.32 Edit 0.42 Edit Try 1:01 55 Info 1080 Try 1: X 20.83 Try 2:9.091 5 5 Info 1090 PD NG 3 View HI Try Try Try Ent Tole Hidi For mar enti grat Hidi

1. The concentration of NaOH from the best three of your trials. 2. The average concentration of 3 of your trials (only use 3 trials) 3. The standard deviation of your 3 trials [If you have a calculator with stats on it, you can use that/bring it to class, but for the lab report you will have to write out your calculations.] 4. Your PPT.

Data Collection Kinetic Data Collection Time, t (s) Volume of added base (mL) First addition 40 0.50 Second addition 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Fifth addition 278 2.49 Sixth addition 334 3.01 Seventh additlon 389 3.48 Calculations Concentration of NaOH stock solution: 0.01 M Concentration of t-BuCl stock solution: 0.2 M Volume of t-BuCl solution: 10 mL stock stock solution added to 25 mL acetone Table view List view Kinetic Data Volume of Moles of Amount of t-Bucl (mol) [-Buc] In[-BuC Time, t (s) added base added base (mL) (mol) First addition 40 0.50 Second additlon 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Flfth additlon 278 2.49 Sixth additlon 334 3.01 Seventh addition 389 3.48 Use the data in the table above to plot In[t-BuC]]; vs time (s). Include labelled axis, a title, and a linear trendline. Upload your plot here.

What are the advantages of a microscale lab?

There is one incorrect answer here. Can you help me figure out which one?

20,18,2,4,15,15,10 Using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.  Construct the 80% confidence interval. Round your answer to one decimal place.

LabQuest 17 DATA TABLE Trial 1 2 3 4 5 6 Concentration (mol/L) 0.080 0.16 0.24 0.32 0.40 Unknown number Absorbance (no units) 0.2711 0.437 1.480 1.932 2.171 0.3 DATA ANALYSIS 1. Describe an alternate method for determining the molar concentration of your unknown sample of copper (II) sulfate solution, using the standard data.

Please do question 5 for me and please don’t return in it just write one sentence for each box

28-31. Supply the missing value. n 1.55 1.65 1.70 1.80 ??? 1.62 Conc. 10% 15% 25% 35% 22% ??? 28-29.a. 1.66       c. 1.70b. 1.68       d. 1.72 30-31.a. 14.24     c. 16.24b. 15.24     d.17.24

I am not asking for help in writing this report.  Could you solve the calculation parts for the steps on the last page? like 13, 14, 15, 17, 18, and 19. This experiment is based on this video: https://www.youtube.com/watch?v=SVvGtcFhdls

C12H13O3 (find structure )

Which of the following is incorrect: a. General steps in quantitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a inverse proportionality between a measured property and the concentration or amount of substance.

Which of the following is incorrect: a. General steps in quantitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a inverse proportionality between a measured property and the concentration or amount of substance. Please fill in the spaces one of the following characters (a or b or c or d or e) Answer:

3. What should be worn in a laboratory at all times to decrease the likelihood of eye injury? What should be done if a chemical gets in the eye?

LIMIT TEST (IMPURITIES - BIOLOGICAL) Instructions: Note the color change of each of the samples by writing blue or pink accordingly. Then give inference whether the sample is contaminated or not contaminated upon observation. Answer the highlighted numbers.     BLANK  (Sterile distilled water) Reference Sugar Solution Sample A Sample B REPLICATE 1 BLUE BLUE PINK PINK REPLICATE 2 BLUE PINK BLUE PINK REPLICATE 3 BLUE PINK PINK PINK INFERENCE NOT CONTAMINATED CONTAMINATED 1 2   1. 2. 3. Which of the two samples is relatively clean of biological impurities? 4. Given the result in limit test as an analyst, what will be the final conclusion to this? Write whether rejected or accepted for each sample.  (see attached photo)

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Anna is excited about conducting her lab today. She takes out her lab sheet and reads over the lab. She gathers all of the lab materials. She follows each lab procedure step-by-step until she has completed the procedure and recorded all of the data she collected. Afterward, Anna takes two of the substances and mixes them together to see what will happen. Which lab safety rule did Anna break? a. Follow all written and verbal instructions. If you do not understand something, ask the teacher first. b. Monitor experiments at all times. c. Wear goggles any time chemicals, heat, or glassware are used. d. Only perform experiments that your teacher tells you to perform. Never do anything that is not in the procedures.   PLEASE ANSWER THE QUESTION.

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Procedure 1. A crime situation is presented to you. You need to solve the crime by using your senses and given information. 2. Fill in the investigation report correctly. CRIME SCENE A man is found dead in a vac ant lot near his work place. In the crime scene, the SO cO collected different pieces of evidence including two pieces of cloth tainted with unknown stains. The police are hoping that through these pieces of evidence they could find the culprit criminal. or Cloth A Cloth B Pieces of evidence Data and Result Crime: Date: Piece of collected evidence:_ OBSERVATIONS: Cloth A Cloth B Final Findings: Questions 1. Which of the cloth A and cloth B can be used as possible source of evidence in the crime? Why? 2. Which property of matter did you use in making your observation?

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 30. Indicator used in the assay of diluted Phosphoric acid. a. thymolphthalein d. methylene blue methyl orange b. phenolphthalein e. C. methyl red 31. Materials to be sampled include the following, except: a. Records C. Final products Raw materials b. Intermediate products d. 32.Color of methyl orange in acidic medium a. Yellow C. Blue b. Colorless d. Pink 4

What is a lab report

Clinical __________________ is defined as a quantitative relationship between dose and effect that provide a way to interpret the measurement of concentrations of drugs in biological fluids.