1. Why do li ne spectra for substances differ? Could line spectra be used to "fingerprint"...
What is an absorption line spectrum and why do stars have absorption line spectra?
3. Why do He and H produce different line spectra? Is the same fundamental process is responsible for emission of photons in both elements? 4. When observing the various metal salts, you probably noticed that any red bands always appear at approximately the same scale reading. The same is true for other colors too. Why?
can you answer the three questions please 1 - The spectra show could be attributed to: a) 5 solutions of the same substance with different concentrations (6) 5 solutions of different substances with the same concentration c) A single solution containing 5 different species d) Absorption spectra of 5 different atomic species 2. The lowest electronic transition energy in Cdl complex which exhibits intense yellow color: a) . b) d-c* cd- d d ) n- e) TC-TE charge transfer Compared...
1.What are trans fats and how do they differ from other kinds of fats? 2. What are the major sources of artificial trans fats in our diet today? What was the first manufactured food product to contain artificial trans fats? Why did the popularity of products containing artificial trans fats grow in the 1950s-1980s? Why did Canada and other countries recently ban these substances, and why does one of doctors interviewed in that occasion call them “a real tragic story...
1. Explain the difference between an intron and an exon. 2. Why do the two possible PCR products differ in size by 300 base pairs? 3. Explain how agarose electrophoresis separates DNA fragments. Why does a smaller DNA fragment move faster than a larger one? 4. What kind of controls are run in this experiment? Why are they important? Could others be used?
What is the minimum number of samples that could make a standard line on the calibration curve and why do we use many samples
23. How do genomic and cDNA libraries differ? Which can be screened with antibodies and why? 24. How are oligonucleotides, once important as probes for screening libraries, used today? 25. What is the difference between cloning and PCR? 26. Why did scientists push for the human genome to be sequenced?
The Balanced Scorecard 1. Why might measures used in a balanced scorecard differ from company to company? 2. Why does the balanced scorecard include financial performance measures as well as measures of how well internal business processes are doing? 3. If you were at a company and were being reviewed on an annual basis for promotions, increases in salary, etc - would you prefer to be evaluated with a balanced scorecard approach? Some other assessment method? Why?
(1) (a) Find the equation of the line, Li, which passes through the points A : (4,y,z) = (0, -5, -3) and B : (x, y, z)=(3, 1,0). (b) Find the equation of the line, Ly, which passes through the points C:(x, y, z)=(-1, -3,2) and D: (x,y,z) = (4,3,6). (c) Show that L and Ly are not parallel lines. (d) Write the parametric equations for L, and L2, and then show that the lines Li and L2 do not...
which of the following pairs of substances could be used to construct a single redox electrode O Cals) 。Pt(s) Br (aq) O Pi2+(aq) 1 points Savecd QUESTION 4 Saved Examine the following half-reactions and select the strongest reducing agent among the species listed: Hgos) + H2O) 2 Hg) 20H (aq) E = 0.0977 V, Zn(OH)2(s) + 2e- Zn(s) + 20H-(aq)E" =-1.25V, Ag2O(s) + H20() + 2e- Ag(s) + 20H-(aq)E" = 0.342 V, B(OH)3(aq) + 7H+(aq) + 8e- zt BH4-(aq) +...