Explain forensic scientists in analyzing crime scenes

Reference no: EM13185986

1)The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood.
Luminol has a molecular weight of 177 g/mol

Question: Before investigating the scene, the technician must dilute the luminol solution to a concentration of 5.00×10?2
M . The diluted solution is then placed in a spray bottle for application on the desired surfaces.
How many moles of luminol are present in 2.00 L of the diluted spray?

2) A student placed 20.0
g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 40.0-mLsample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mL of the final solution?
Express your answer numerically in grams.

Reference no: EM13185986

Questions Cloud

Compute the van der waals correction terms to pressure : Calculate the van der waals correction terms to pressure and volume for Cl2 at STP. The values of the van der waals constants a and b are 6.49L^2-atm/mol^2 and 0.0562 L/mol,

Estimate the relative error in the calculated surface area : The circumference of a sphere was measured to be 73000 cm with a possible error of 050000 cm. Use linear approximation to estimate the maximum error in the calculated surface area. Estimate the relative error in the calculated surface area.

How many trees should be planted to maximize the total yield : An orchard contains 50 peach trees with each tree yielding an average of 58 peaches. For each 4 additional trees planted, the average yield per tree decreases by 12 peaches. How many trees should be planted to maximize the total yield of the orcha..

Determine the the appropriate discount rate : Jethro has been promised a payment of $1000, which is to be paid exactly 8 years from now. He is completely certain that the payment will in fact be made. Jethro believes that the appropriate discount rate is 5% per year, and that this will contin..

Explain forensic scientists in analyzing crime scenes : The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood.

Find the length of the wall of the classroom : the aera of a rectangular wall in a classroom is 126 square feet. it lenght is 3 feet shorter than three times its width. find the length of the wall of the classroom.

What is the maximum probability of failure : Your insurance stipulates at least one system must be working 9989 times out of 10000. In order to achieve that level with two independent systems, what is the maximum probability of failure allowed for a single system?

What is jeff expected earnings from the concert : The local weather station (which we'll assume is accurate in giving forecasts) predicts that the chance of rain is 25 percent for the day of the concert. What is Jeff's expected earnings from the concert?

Define the haber-bosch process : The Haber-Bosch process is a very important industrial process. In the Haber-Bosch process, hydrogen gas reacts with nitrogen gas to produce ammonia according to the equation 3H2(g)+N2(g)--->2NH3(g)

User Account

All Pages