Activity 1

Supply the missing information in the table. (Given in Blue). Answers in scientific notation should be in this sample format >>> 1.0 x 10-14

You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.

What is Donnan's theory? What is its importance in biophysical chemistry?

What is the answer of this?

Please help me graph this on a graph like this .

In the following sub-questions, use your book and notes to generate an argument for each model of light. Remember, on the first day of class we discussed that argumentation requires: ● a claim (which I've given), • evidence (which you should look up in the form of data or scientific principles) and reasoning that connects the evidence to the claim (which you should generate from your understanding so far).

Please answer the rest. This is using up another one of my questions

What variable will you change in this experiment? This is also called the Independent variable. How will you change it? What variable will you measure in this experiment to determine the effect of the variable you changed? This is also called the Dependent variable. How will you measure it? What variables will you keep the same in this experiment?

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

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

for number 10, do we have to match the color of the solution, like if it was red we make it read or should we match it with the color absorbed  by the solution, such as green- red, orange- blue, and so on?

Describe the sources you should focus on when doing research to support your position.

• 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. ·

hello can you plz help me plzzz

Catra wanted to determine the concentration of copper(II) chloride at an unknown concentration .She began by trying to determine the value of epsilon (ε) using beers law for copper(II) chloride. Catra remembered in lab when they wanted to solve for epsilon they would test the absorbance for three different concentrations of a known solution and then graph it. Catra got frustrated and asked Shera what to do next to determine epsilon. What should Shera tell Catra?

Is this correct for the diaper dissection lab

Sea X Assignments: ANATO X Gi 0220907135028396%20(1).pdf 2 CD Page view Human Anatomy X A Read aloud *20220907135028396 X TAdd text Draw 4 You prepare four solutions: Solution 1: Reactants + enzyme at #0 (about 100°F) and pH 7 Chemistry Check your recall lab. x V Highlight UNIT 2 65 3 Decompression sickness (also known as the bends) is a condition that affects divers and others operating under pressurized conditions. It occurs when gases such as nitrogen (N₂) come out of solution in the blood. This can lead to symptoms including joint pain, shortness of breath, and paralysis. Severe cases may result in death. a What type of molecule (ionic, polar covalent, nonpolar covalent) is nitrogen gas? b The liquid medium of blood is water. What type of compound (ionic, polar covalent, nonpolar covalent) is water? c What happens when molecules such as nitrogen gas mix with water? How does this explain the problems we see with decompression sickness?

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.

please highlight the correct answer

_4. Preservatives that are usually found in cured meats, bacon, ham, corned beef and hot dogs. A. Benzoates C. Sorbates В. Nitrates D. Acids 5. A type of additive that stabilizes foods through moisture control. A. Emulsifiers C. Humectants B. Flavor Enhancer D. Antioxidants 6. Additives that are usually powders added to baking mixtures which react chemically to release carbon dioxide. A. Raising Agents B. Thickeners C. Humectants D. Antioxidants

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