i need to design the experiment for 5th and 6th grade students, the experiment also should exciting the student , please do copy and paste from the internet. with all of these parts: purpose, introduction, procedure, data collection, results and conclusion and should be the safe experiment.

2) The ferrous ion-orthophenanthroline complex can be used to analyze for Fe(II) by using the absorption of this complex at 508 nm. A group of samples is known to contain between 0.1 and 0.2 g of Fe. A known sample containing 100 mg of Fe per liter was treated according to protocol, and the absorbance on a filter photometer was set to 0. The absorbance of a second standard containing 200 mg Fe per liter was then determined to be 0.795. What is the concentration of the unknown, which was then found to have an absorbance of 0.650?

Use average atomic masses to calculate the number of moles of the element present in each of the following samples.

(a) 66.76 g of fluorine atoms


(b) 405.0 mg of mercury

(c) 84.04 g of silicon

(d) 48.65 g of platinum

(e) 2426 g of magnesium

(f) 47.77 g of molybdenum

A solution contains 0.1 m total carbonate (H2CO3 + HCO3- + CO32-).

a. If the pH is 6, find the concentration of each carbonate species present.

b. If the solution contains also 10-4 m Ca2+, is it saturated, unsaturated, or supersaturated with respect to CaCO3?

1) Ringer's injection contain 0.86% of sodium chloride, 0.03% of potassium chloride, and 0.033% of calcium chloride dihydrate. Calculate the sodium, potassium, calcium, and chloride content in mEq/L.

2). If a liter of an intravenous fluid contains 5% dextrose and 34 mEq sodium (as NaCl), calculate the percent strength of sodium chloride in the solution.

3). A flavored potassium chloride packet contains 1.5 g of potassium chloride. Hoe many milliequivalents of potassium chloride are represented in each packet?

4). How many milliequivalents of Li+ are provided by a daily dose of our 300 mg tablets of lithium carbonate (Li2CO2- MW 74).

34). A physician wishes to administer 1,200,000 units of penicillin G potassium every 4 hours. If 1 unit of penicillin G potassium (C16H17KN2O4S- mw. 372) equals 0.6 mcg, how many milliequivalents of K+ will the patient receive in a 24-hours period?

36). How many milligrams of magnesium sulfate (MgSO4. 120) should be added to an intravenous solution to provide 5 mEq of Mg2+ per liter? 41). A normal 70kg (154Ib) adult has 80 to 100g of sodium. It is primarily distributed in the extracellular fluid. Body retention of 1 g additional of sodium results in excess body water accumulation of approximately 310 mL. If a person retains 100mEq of extra sodium, how many milliliters of additional water could be expected to be retained?

44). The usual adult dose of calcium for elevating serium calcium is 7 to 14 mEq. How many milliliters of a calcium gluceptate injection, ech milliliter of which provides 18 mg of element calcium, would provide the recommended dosage range?

46) Calculate the milliequivalents of chloride per liter of the folllowing parenteral fluid: Sodium Chloride 516mg Potassium Chloride 89.4mg Calcium Chloride, anhyd 27.8 mg Magnesium chloride, anhyd 14.2 mg Sodium lactate, anhyd. 560mg Water for injection ad. 100mL

48). GOLYTELY, a colon lavage preparation, conatins the following mixture of dry powder in each packet to prepare one gallon of solution: Sodium sulfate 21.5g Sodium chloride 5.53g Potassium chloride 2.82g Sodium bicarbonate 6.36g Polyethylene glycol (3350) 227.1g

52). A solution contains 322 mg of Na+ ions per liter. How many milliosmoles are represented in the solution?

54). Calculate the osmolarity, in milliosmoles per liter, of a parenteral solution containing 2 mEq/mL of potassium acetate (KC2H3O2- mw 98).

57). A hospital medication order calls for the administration of 100g of mannitol to a patient as an osmotic diuretic over a 24-hours period. Calculate. a) how many milliliters of a 15% w/v mannitol injection should be administered per hour and b0 how many milliosmoles of mannnitol (mw 182) would be represented in the prescribed dosage.

protein molecules are polypetide chains are made up of amino acids in their phisologically functoning or native state these chains fold in a unique manner such that the nonpolar groups of the amino acids are usually burired in the interior region of the proteins where there is little or no contact with water. when a protein denatures the chain unfolds so that these non polar groups are exposed to water. a useful estimate of the changes of the thermodynamic quantities as a result of denturation is to consider the transfer of hydrocarbon such as methane from an invert solvent to the aqueous enviroment:

a) CH₄ => CH₄ ​(g)

b) CH₄​=> CH₄ (aq)

if the values of delta H and delta G are approximately 2.0 kJ/ mol and -14.5 kj/mol respectively for (a) and -13.5 kJ / mol and 26.5 kJ/mol , respectively for b) calulate the values of delta H and delta G for the transfer of 1 mole of CH₄

​according to the equation

CH₄ =>CH₄ (aq)

comment on your results assume T = 298 k

The following questions refer to the following system: 500.0 mL of 0.020 M Mn(NO₃)₂ are mixed with 1.0 L of 1.0 M Na₂C₂O₄. The oxalate ion, C₂O₄, acts as a ligand to form a complex ion with the Mn²⁺ ion with a coordination number of two.

Ascorbic acid( C6H8O6) is a diprotic acid. (ka1=6.8*10^-5, ka2=2.7*10^-12)

What is the pH of a solution that contains 4.4 mg of acid per milliliter of solution?

Starting with 7.2 g of salicylic acid, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume salicylic acid is the limiting reagent and a one to one stoichiometry. Use the molecular weights that you have already calculated. Give two significant digits.

A sample of THAM primary standard base weighed 0.9180 grams. After dissolving in 100ml deionized water and adding four drops of brom-cresol-green indicator, an HCl solution was added gradually until a definite color change was observed. At this point, 28.20 ml of HCL solution had been drained from the buret. Using the equation for the overall reaction, calculate the molarity of the HCl

Q1. A compound was characterized using UV-visible absorption spectroscopy. The absorbance spectrum of a 1.00 x 10–4 mol/L solution in a 1.00 cm path length cell peaked at the wavelength of 345 nm to a value of 1.32.

(1) What was used as a reference? Specify the cell and its contents.

(2) What is the transmittance at that wavelength?

(3) What is the molar absorptivity at that wavelength?

Q2. Answer the following questions regarding quantitative analysis using UV-visible spectroscopy. Assume that the spectrometer gives you the raw intensity spectrum of the transmitted light as a function of the wavelength only, and the light source is stable.

(1) You are given a water-soluble compound. Explain how you can obtain the spectrum of specific absorption coefficient ε(λ) = Abs/(bc), where Abs is the absorbance spectrum, b is the path length, c is the mass concentration (wt% or g/mL).

(2) Let us assume that you have obtained specific absorption coefficient εa(λ) and εb(λ) for two water-soluble compounds a and b having different colors. You are given a mixture that consists of the two compounds and a third transparent compound. How can you find the concentrations of and b (ca and cb, respectively) when the total concentration of the mixture in water is c (c > ca + cb). Explain the procedure.

Determine the pH of an HF solution of each of the following concentrations.

Part A: .280 M

PartB : 4.5*10^-2 M

Part C: 2*10^-2

Part D

In which cases can you not make the simplifying assumption that x is small?

In which cases can you not make the simplifying assumption that x is small?

Given the following sequence: LHYEAIAKAWNDAF

a. Classify each amino acid into polar, non-polar, & charged (at pH 7.0)–put a letter above each to show if polar (p), non-polar (n), or charged (c).

b.What are the ionizable groups?

c.What is the order of the pKaʼs going from low to high pH

d.What is the isoelectric point (pl) of this peptide?

e.At the pHʼs of 3, 6, & 9, what is the charge state?

f.What type of secondary structure would this peptide take and why?

g.How long would it be?

h.How many hydrogen bonds, at maximum

Hello,

In an experiment to determine the concentration of glucose in a sample, we are supposed to make a glucose assay with glucose solutions of known concentration. The absorbance for each solution of known concentration will be plotted, so that we can use the line of absorbance rates to later find the concentration of our unknown sample. We need to make our own dilutions for the assay.

We are given a stock glucose solution of 10mg/mL (1000mg/dL). My group wants to make solutions with concentrations 0mg/dL; 100mg/dL; 200mg/dL; 300mg/dL; 400mg/dL; and 500mg/dL. We are unsure of the best way to make the dilutions.

Would we make a 100mg/dL dilution be adding 1 part of stock and 9 parts deionized water? And a 200mg/dL dilution by adding 2 part stock and 8 parts deionized water; 300mg/dL as 3 parts stock and 7 parts deionized water, and so on? I'm unsure of how to do this.

Thank you!