Experimental Procedure: 250 mL of the copper solution was made by creating 100 mL of the solution, reacting CuO with HNO3, and then diluting to the mark of 250 mL. Using this stock solution, different concentrations were made and placed in the sprectrometer for observation. The absorbances and transmittances were recorded for use when identifying the amount of the color-absorbing copper ions later. A graph was plotted of Absorbance v. Molar Concentration easily see the results of the experiment. Pre-Lab Questions: 1.
Use your line graph from Part II to interpolate, or estimate, atomic radius of Tin (Sn).Â (1 point) Answer: By using the given line to interpolate the atomic radius of tin, it can be found that its radius is around 149pm. 5. Tinâ€™s actual atomic radius is 140 pm.Â . Use the math equation below to determine the percent error of your estimated value. (2 points) Percent error = × 100 This equation means that you subtract to find the difference between the actual value (given in this problem) and the experimental value (estimated from the graph).
Explain the difference in these two readings. 8. In the legend beneath Figure 2, the authors give an equation indicating that diastolic blood pressure is DBP = 25.8 + 0.13x. If the value of x is postnatal age of 30 hours, what is the value for Yˆ for neonates ≤ 1,000 grams? Show your calculations.
Name: Robert Christopher Date: 16/2/2011 ID: 0670000687 COMPARISON OF ARTERY AND VEIN Raw Data Table 1: Below are the results of the experiment completed through cutting down the vein and artery into a ring-like shape. A 10g-50g of mass is used to suspend the artery and vein; and measured it with a 1-meter ruler standing 90˚ on the table to distinguish how long it stretches with a specific mass weight. Average Length ± 0.05g/mm | Mass ± 0.05mm/g | Artery | Vein | | Trail 1 | Trial 2 | Average | Trial 1 | Trial 2 | Average | 0g | 393 | 377 | 385 | 370 | 374 | 372 | 10g | 392 | 376 | 384 | 368 | 372 | 370 | 20g | 391 | 375 | 383 | 366 | 370 | 368 | 30g | 390 | 374 | 382 | 364 | 368 | 366 | 40g | 389 | 373 | 381 | 362 | 366 | 364 | 50g | 388 | 372 | 38 | 360 | 364 | 362 | Data Presentation Table 2: Below are the results of the artery and vein’s length difference in mm. These results were known when the average results from the two trials were calculated. The results can be calculated with the following formula: "trial 1 + trial 2; then divide the result by 2 to get the average mean results”.
* Place a weighing paper on the balance. Press down on the bar again, waiting untill the scale zeros out, showing “g” for grams to the far right of the display screen on the balance. * Place the specified amount of chemical on the weighing paper, on top of the pan. * Record the number on the scale; this is the weight of the chemical in grams. 3.
BMI=25.96 this is what I came up with as my BMI figure in the Kg/Meters. “One Kilogram equal 2.2 Lbs and 1 inch equal .0254 meters”. To convert your height by to inch 1 foot =12 inches: 5 foot *12 inches = 60 inches that is how you come up with the inches. Pounds to Kilograms: 132.50 lbs/2.2 =60.227 kgs which basically means 132.50 is equivalent to 60.227 kilograms. To figure out if your over weight do the formula just like I did above and if you are: •
The method used to convert the measurement in inches to a decimal was to take the recording of the number plus the fraction out of 8 and add it to the nearest tenth of the smallest division. For the Vernier Caliper, we recorded the reading by finding a mark on the sliding scale that lined up with any mark on the fixed scale. Then the lines that line up with the number on the fixed scale is recorded based on the intervals between two of the numbers. For the micrometer, the number of millimeters on the frame is first read. If the next mark is visible, we add 0.5 mm.
LAB REPORT 4 Testing Forces by Reaching Equilibrium ABSTRACT: This lab measures the equilibrium of three weights and four weights on a line to determine if adding all the horizontal forces and vertical forces summed to together equal zero. We found that once we were able to determine the vertical and horizontal forces together they did in fact equal zero, if we determined the forces to be the weight in kilograms times 9.8 for the gravity constant on earth. We also found systematic errors of about 0.325 in our force sensor when measuring the force downward from .150 kilograms to 0.350 kilograms. The errors were in this range. We also worked with a pulley system in which we discovered that we could reduce the force load by one half by using a pulley system with two parallel lines holding weight.
Purpose: To find the percent of phosphorus in known compound MgNH4PO4*6H2O using gravimetric analysis. Procedure: 1. Weigh by difference to the nearest hundreth gram .75 of your unknown sample, using weighing paper. Using solualbe Expert plant food label percentate 30% P2O5. 2.
Step 1) Identify the legs and the hypotenuse of the right triangle. | The legs have length '14' and 48 are the legs. The hypotenuse is X. See Picture | The hypotenuse is red in the diagram below: Steps 2 and 3 | Step 2) Substitute values into the formula (remember 'c' is the hypotenuse) | A2 + B2 = C2 142 + 482 = x2 | Step 3) Solve for the unknown | | Problem 2) Use the Pythagorean theorem to calculate the value of X. Round your answer to the nearest tenth.