PHYS_102_lab_5

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True or false and why is false 1   There are 2 major classes of keratins: alpha keratins (found in mammals) and beta keratins (found in feathers and scales of birds and reptiles) 2  One estimate of mobility within a crystal is the B-factor that reflects spreading or blurring of electron density   3 In NMR, the longitudinal relaxation time (T1) reflects the rate at which magnetization returns to the longitudinal axis after a pulse

From the ff reactions thermal data 2 Fe (5) 2 Fe 0 (n 가을 02 (9) = re203 (1) +// 02 197 = Tez 03 (1) Fe 21 Fe (s) + 2H+ (a=17 = H* (a=1) Ξ 02 (9) H₂ H₂197 + calculate the Fe 0 (s) + : = H₂0 (1) Ho of 2H¹ ca=1) Z (a=1) the reaction at 25 ue. + H₂(a) H₂D + Fe 2+ AH (cal) - 196, 500 cal - - 47, 900 21, 000 (9=1) 0 GS, 320 cal CGI (al

If an analytical method relies on a measurable property of an analyte that can be correlated with the amount of the said analyte, what type of analytical method is it?   Oxidative methods   Instrumental methods   Blank Correction methods   Classical methods

just 2 please

H J K L Enter V B N M Shift Chapter 2 An Introduction to the Chemistry of Life 37 SELF-QUIZ: TESTING YOUR KNOWLEDGE 1. Each atom has a nucleus made up of р. 24. 2. In atoms, the number of protons is usually equal to the number of 3. The atomic number of an atom is equal to the number of 7. Proteins and carbohydrates consist primarily of carbon, hydrogen, and oxygen; these two molecules are types of and neutrons. -compounds. p. 31. 8. On the pH scale, a pH of is neutral; a solution with a pH less than this is this is 9. Chemicals like bicarbonate that resist pH change are called р. 25. and a solution with a pH greater than р. 32, in the nucleus. p. 26. 4 An alternative form of an atom is called an differs in the number of neutrons in the nucleus. p. 26. 5. A bond formed between two atoms that share electrons is called it p. 33. 10. When water molecules dissociate, they form and ions. p. 32. bond. p. 28. bonds form between oppositely charged atoms of a(n) polar covalent bonds of…

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Why HPLC is an important   technique in the fields of chemistry . explain with different reasons?

The quenching of tryptophan fluorescence by dissolved O₂ gas was monitored by measuring the emission lifetimes at 348 nm in aqueous solutions. [0₂]/(10-² mol dm-³) T/(10-⁹ s) 0 2.3 5.5 8 10.8 2.6 1.5 0.92 0.71 0.57 A. 0.95 E-2 M B. 4.3 E-2 M C. 1.8 E-2 M D. 3.0 E-2 M E. None of the choices From the data above, predict the value of [0₂] required to decrease the intensity of tryptophan emission to 50% of the unquenched value.

Please don't use Ai solution

Just part b!!!

3. The value of "f" for the initiator efficiency in the equation below is usually between 0.3 and 0.8. Explain why it is less than unity. R₁ = 2fk [1] Where f= Initiator efficiency R₁ = Rate of initiation [I] = Initiator concentration

Consider the reaction : A+B 2 AB. A calibration plot was constructed using x as the concentration for AB in M and y as the absorbance value of AB, it provided the linear equation : y=25x+0.0008. Determine the concentration of AB in M if the absorbance value is 1.22. Round and report your value to the THIRD decimal place. Numeric value only, no unit. No new data to sa IMG 0915.jpeg e to search PrtScn Home

Describe an electrochemical sensor assay method for rapid bacterial detection and identification.What are the principles and mechanisms involved?

5. The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the percent relative error if the total volume of titrant is a. 50.00 mL b. 10.00 mL 6. From the Gaussian (normal) error curve, what is the probability that a result from a population lies between 0 and +1 σ of the mean? What is the probability of a result occurring that is between +1 σ and +2σ of the mean?

None

I need the answer for this question as Sage Math Code. It's a linear algebra

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is beta hCG testing a analytic technique? why or why not?

The raw data is plotted in figure A. Then I transformed the absorbance data to make figures B and C.  A line (instead of a curve) on each plot would predict what reaction order for the rate law?

Define the following terms: Molecular ion Fragment ion Abundance/Relative Intensity Mass to charge ratio (m/z)

In the HQS-Mg fluorescence part of Lab 6, a calibration curve is made of fluorescence intensity vs. MgCl2 concentration (M). The standard solutions for the calibration curve were made by mixing a small amount of 0.01 M MgCl2 with some HQS solution. Calculate the concentration of MgCl2 (M) in each of the following standards. Report your concentrations to 3 sig figs. Fluorescence Volume of 0.01 M Volume of 1 mM Concentration of MgCl2 (M) Intensity MgCl2 (mL) HQS (mL) 0.031250902 0.8 100 0.049490754 0.8 50 0.059803507 2 100 0.085834029 3.6 100 Hint: The total volume of each solution is volume of 0.01 M MgCl2 + volume of 1 mM HQS.

3 g of activated charcoal was added to 2 L of a solution containing organic dye X. The initial concentration of the dye was 1000 ppm and the concentration after removal of the activated charcoal was 400 ppm. Calculate how many mg of organic dye X are adsorbed on the activated charcoal. Calculate the ability of activated charcoal to adsorb dye X (expressed in a weight to weight ratio).

10 Find the transition time of 20g naphthalene with the surrounding temperature as 30oC.Let the boiling tube has mass 25 g, diameter 2.5 cm and thickness 0.15cm. How much time does 30g of ice takes to melt at a surrounding temperature of -50C. (We are using a boiling tube having mass= 20g, radius=1.5cm, thickness=0.2cm.) In the above experiment, let the surrounding temperature is changed to 0oC. What will be the change in the transition time for ice? Repeat the experiment for different surrounding temperatures and study the variation of melting point of ice. Calculate the melting point of wax having a mass 30g. Let we are using a boiling tube of mass 25g, having a thickness 0.5 cm and radius 1.5 cm.( Choose surrounding temperature as 40oC)

What are the advantages and disadvantages of using external standards in instrumental analysis?