Ch_03 Chapter review

Consider the following data set: Sample 1 2 3 4 5 Diluted Unknown (25% dilution) Diluted Unknown (50% dilution) Undiluted Unknown Absorbance at 470 nm 0.032 0.058 0.090 0.114 0.140 0.072 0.138 0.210 Concentration 1.00 x 10-³ M 2.00 x 10-³ M 3.00 x 10-³ M 4.00 x 10-³ M 5.00 x 10-³ M 1. Using MS Excel, plot a calibration curve for samples 1 to 5 (Attach a printed copy of the graph). Determine the molar absorptivity. 2. Calculate the concentration of the diluted and undiluted unknown using the linear regression equation produced from #1. 3. Back-calculate the concentration of the undiluted unknown using the calculated concentration of the 25% and 50% diluted unknown from #2. 4. Explain any significant difference that you see between the concentration of the undiluted unknown that is back-calculated from the absorbance of the 25% and 50% diluted unknown, and the concentration that is directly calculated from the absorbance of the undiluted unknown. 77

Based on a grade 11 chemistry student, answer the following question based on the provided information in the provided information: Do you think Mary died due to an overdose of medication? Use evidence from your calculations to support your reasoning. Mary's weight is 50 kg.

Please answer fast i give you upvote.

Create an illustration showing the preparation of two-fold serial dilution follows the ratio of the final dilutions as shown in the table above.

What would be an appropriate shelf-life, t90, for this drug (in days) in this solution?

When something cannot be directly obeserved, it can be represented by a Group of answer choices Model Graph Hypothesis Theory

Carbon dioxide concentration (parts per million) Examine the graph and answer the following questions. Part A Atmospheric Carbon Dioxide What was the average rate of increase in carbon doxide concentration between 1900 and 19407 410 400 Express you answer in parts per million per year to two significant figures. 300 380 a ? 370 360 ppm/year 350 340 Submit Bequest Anawer 330 320 310 Part 8 Complete previous parts) 300 290 - 1860 1880 1900 1920 1940 1960 1980 2000 2020 Provide Feedback Next> Year

1) Which of the diet sodas have the highest concentration of caffeine? Which standard best reflects this concentration?

Assessment Chemistry x Copy of spread of ista X E The Spread of Islam- x oncourseconnect.com/assessment/1651879/5287e2a3-0d0b-e2c0-c15c-3e68a37149b4 N hbox (004) aarolamex Clase D TPSS Bookmarks CHEMISTRY BENCHMARK TEST 01 CHEMSTRY1IARON JAMES ID 12390724) Aluminum (Al) reacts with chlorine (Cl,) gas to form aluminum chloride. Given the position of aluminum in the periodic table, what charge should the aluminum ion have in this compound? -5 +1 +3 + (P O A O B O D Save/Exit 1 4 5 6 8 9 10 US ASUS

Topic: Pricing the Prescription 1. Solve the Professional fee and Mark up %2. What is the dispensing price using the % mark up and minimum fee method.  Ingredients   Phenacetin 5.00g Aspirin 4.00g Caffeine citrate 1.00g  Sig. One tablet for three time a day Professional Fee= 25.00 php Mark Up %= 30% Phenacetin= 152.55php/1.2kg  Aspirin= 65.00php/kilo  Caffeine Citrate= 25.95php/1.2kg

• Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·

How do I do a rice chart?

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

Suspect #1: George Norman Suspect #2: Becky Baker George Norman recently Becky Baker is a world famous chef. She had just finished baking a cake at the time of the crime. The recipe called for baking soda. The formula for baking soda (sodium bicarbonate) is had an accident where he cut himself with a Alaia knife. He cleaned the wound with rubbing alcohol. The formula for rubbing alcohol Bak ing Seda NaHCOз. (isopropanol) is C3H80. Suspect # 3: Liz Lemon Suspect #4: Ben Linus Liz Lemon just had her nails Ben Linus had been walking done, and she still has traces of nail polish remover on her hands. Nail around in the rain for about an hour before the crime polish remover he was suspected contains acetone. Acetone of occurred. He The formula for Polish was dripping wet with water acetone is C3H60. renover at the time. The formula for water is H2o.

0 / 5,000                         What is your question?   photo 0 / 2 Images Ask an Expert Submit your question Answers in as fast as 30 minutes* Questions are typically answered in as fast as 30 minutes* Like you, we deeply value honesty and integrity. Learn about our honor code. *Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. Get 24/7Homework Help! Ask a homework question in 30 subjects...and growing! Subject matter experts are on standby 24/7. Get a detailed solution in as fast as 30 minutes.* Recently asked questions     About FAQ Honor Code Code of Conduct Sitemap Careers Become an Ambassador Refer a Friend Contact Bartleby Contact Research (Essays) High School Textbooks Literature Guides Concept Explainers by Subject Essay Help

* The data in the table below were obtained during a photometric determination of glucose in blood serum. A serum sample gave a transmittance of 0.45. Find the glucose concentration in the blood serum. * Glucose 0.0 2.0 4.0 6.0 8.0 10.0 concentration, mM Absorbance 0.002 0.15 0.294 0.434 0.5704 0.704

2) Which of the diet sodas have the lowest concentration of aspartame? Which standard best reflects this concentration?

Please answer as much as I can

solve for the line equation and R2 given the table below

A serial dilution was performed using 5 successive test tubes. What is the dilution in the 3rd tube? 1ml Original inoculum Dilutions 1:2 1:10 1:100 1 ml 1 ml 9 ml of diluent in each tube 1 ml 1 ml

Subparts 4-6

Chemicals usually have both physical and health hazard. Identify the following if it b hazard. Health Hazard Mutagen Physical Hazard Barbeque have this benzo (a] pyrene that can cause cancer Physical Hazard Fire Toxins Physical Hazard Chemical burn Physical Hazard Explosives Large amount of smoke being inhaled Physical Hazard Spill of caustic soda in your skin Physical Hazard Health Hazerd Dlog

5

Olympic athletes are tested to see whether or not they are using illegal performance-enhancing drugs. Suppose that urine samples are taken and analyzed, and the rate of false positive results is 1%. Suppose also that it is too expensive to refine the method to reduce the rate of false positive results.We certainly do not want to accuse innocent people of using illegal drugs. What can you do to reduce the rate of false accusations even though the test always has a false positive rate of 1%?

Pre market notification is required for cosmetics sold in Canada. Group of answer choices True False

I need answer within 20 minutes please please with my best wishes

Question: Calculate the percent of sodium hypochlorite in the original bleach bottle using your average result. Solution A Average titration volume dispensed: 41.19mL (N22S2O3 5H20) Actual Mass of Na2S203 5H2O : 6.811g Concentration of Na2S2O3 5H2O solution: 0.0549M

Chemistry Hello! Can you please explain why these answers are wrong? Thank you.

Which branch of chemistry would be the most relevant to a learner that plans on becoming a nutritionist? A physical chemistry B C D biochemistry inorganic chemistry nuclear chemistry

I need help with my homework

Glucose levels are routinely monitored in patients suffering from diabetes. The glucose concentrations in a patient with mildly elevated glucose levels were determined in different months by a spectrophotometric analytical method. What is the mode of the glucose concentration on Month 2? Time Glucose Concentration (mg/mL) 1108, 1122, 1075, 1099, 1115, Month 1 1083, 1100 Month2 992, 975, 1022, 1001, 991 Month 3 788, 805, 779, 822, 800 Month 4 799, 745, 750, 774, 777, 800, 758 992 mg/L 996 mg/L 101 mg/L O None of these

What is primary-standard grade classification of chemicals and give three examples.

1. What are fibers and where are they found? How could forensic scientists use fibers to solve a crime?   2. Define the word probative. What is the probative value of a fiber in a forensic investigation?     3. Describe steps you would take from collecting a fiber(s) at a crime scene to performing an analysis to determine its identity.     4.  Which of the 6 fiber types you observed are natural? Which are man-made?     5.  Are fibers classified or individualized? Why?

Purification table formula: A=Elc Absorption is 1.471 E= 27,000 (GFP) l= 1 cm 1.417=27,000 M^-1 (1 cm) (c) Given 5.44810^-5 M is the concentration convert the concentration units Molarity (mol/l) to mg molar mass of GFP is 27,000 g