Thursday

July 24, 2014

July 24, 2014

Total # Posts: 126

**Dr. Bob**

DISCUSSION: This experiment was conducted to determine the iron content in a breakfast cereal. The results indicate 39% iron in a sample of Kix cereal. This value is slightly lower than the 43% listed on the cereal box. The difference may be attributed to the spectrometer not ...

**Dr. Bob**

It is still placed into the methods part

**Dr. Bob**

and the 0.077 was set to that because that was the lowest number I could get on spectrometer... thats why in the discussion part it said that is why there might be some error.

**Dr. Bob**

Okay so the five volumetric flasks came from solutions that the professor told us to get the wavelength for the highest point of absorbance for asked how I got the highest point of absorbance earlier

**For DrBob**

First the cuvet had to be filled with distilled water and was placed into the spectrometer and set closest to zero, the spectrometer was set for about .077, and then the volumetric flask with the solution of iron-phenanthroline was tested in the cuvet at 510.3 nm for the wavel...

**For DrBob**

After testing the five solutions in the volumetic flasks, the next step was to take the iron phenanthroline solution in the volumetric flask when it was ready to be inserted into an Ocean Optics USB2000+ Miniature Fiber Optic Spectrometer.

**For DrBob**

Five volumetric flasks labeled 100-500 mL were filled with sodium acetate, hydroxylamine hydrochloride, and phenanthroline and distilled water and filled to the mark on the volumetric flask. These solutions were placed one after another into the cuvet to test the wavelength an...

**For DrBob**

The 250 mL volumetric flask was filled with 10 mL of sodium acetate by a graduated cylinder, 1 mL of hydroxylamine hydrochloride by a micro liter pipette and 10 mL phenanthroline by a graduated cylinder. Then the volumetric flask was not to the mark so, the next step was to di...

**For DrBob**

Obtaining a 100 mL flask, it was place under the funnel and the liquid of cereal and hydrochloric acid was filtered out into the flask and a stopper was put on the top. The 100 mL volumetric flask with the colorless iron solution was fitted with a rubber stopper. First, transf...

**For DrBob**

The starting materials for this lab were: a crucible, breakfast cereal (Kix), bun cent burner, 100 mL beaker, hot plate, 100 mL volumetric flask and stopper, a funnel and filter paper. First off by taking the breakfast cereal crushed up and placing it into the crucible, lettin...

**For DrBob**

Methods and Materials: The starting materials for this lab were: a crucible, breakfast cereal (Kix), bun cent burner, 100 mL beaker, hot plate, 100 mL volumetric flask and stopper, a funnel and filter paper. First off by taking the breakfast cereal crushed up and placing it in...

**Dr. Bob**

Can I send you my methods part again I wrote some more in there then you can see if I did it right Please :)

**Dr. Bob**

So should it also be introduced into to the methods part to since I had to do that as part of my methods. And you want me to put the equations into my discussion part of the lab report of each run the equations are y=mx+b or should I put that in the result part

**Dr. Bob**

and phenanthroline and distilled water all this was put into those flasks before my iron solution the professor wanted us to do this so we could see the wavelength on the spectrometer

**Dr. Bob**

Okay so I got the 39% from 5 runs on the spectrometer from volumetric flasks from 100-500 mL filled just sodium acetate,hydroxylamine hydrochloride

**Dr. Bob**

And here is the discussion part of the lab how would I put like a concluding sentence to this. DISCUSSION: This experiment was conducted to determine the iron content in a breakfast cereal. The results indicate 39% iron in a sample of Kix cereal. This value is slightly lower t...

**Dr. Bob**

Okay so I read your part on the discussion... and I added it to my discussion it just seems like I need more my professor said that the discussion part is supposed to repeat everything talked about in the previous sections like the intro,methods ect. It just sounds so incomple...

**Dr. Bob**

I need to know what else would I put into my discussion part of my lab report

**Dr.Bob**

I had to take cereal crush it up and place it in a crucible and cook it tell it was black ash. Then I took that burnt ceral and placed it into a beaker with HCL and water and boiled it tell the cereal was like a liquid cause coming out of the crucible it was in a circle compou...

**For DrBob**

I had to take cereal crush it up and place it in a crucible and cook it tell it was black ash. Then I took that burnt ceral and placed it into a beaker with HCL and water and boiled it tell the cereal was like a liquid cause coming out of the crucible it was in a circle compou...

**For DrBob**

Hey DrBob, I posted an answer to you question on my lab report just to let you know what the y= and r^2 is

**Calculus**

26. Find all points of inflection. f(x) = (5x-3)^(1/3) Note: I have gotten f''(x) = (-50/9)(5x-3)^(-5/3) I would like to know how to figure out the zeros.

**Calculus**

22. Divide the expression before differentiating. F(x) = (8x^3 - 1)/ (2x - 1) Would the way to solve this problem be... F(x) = [(8x^3) / (2x - 1)] - [(1)/(2x - 1)] = [(4x^2)/(1)] - [(1) / (2x - 1)] = (4x^2) - (2x-1)^-1 F'(x) = (8x + 1)

**History**

What do the 35 stars and their arrangement and the 13 strips mean on the 7th Cavalry Guidon Flag that Custer used in the battle of little big horn Thank you for using the Jiskha Homework Help Forum. On the first site you can see the flag: http://www.anyflag.com/history/cavguid...

**math**

an ultralight plane had been flying for 40 min when a change of wind direction doubled its ground speed. the entire trip of 160miles took 2h. how far did the plane travel during the first 40 min? Let V be the initial ground speed and 2V be the final ground speed, in miles per ...

**calculus**

a 20 ft ladder is leaning against a wall. The bottom is being pulled out at a constant rate of 2.5 ft/sec. Will the top of the ladder clide sown thr wall at a constant rate? What will the rate be? In relation to time? It is not constant. Use pythagorus: x^2 + y^2 = l^2, where ...