The following data were obtained for the concentration vs. time for a certain chemical reaction. Values were measured at 1.0 s intervals, beginning at 0.00 and ending at 20.0 s. Concentrations in mM are:
10.00, 6.91, 4.98, 4.32, 3.55, 3.21, 2.61

2.50, 2.22, 1.91, 1.80, 1.65, 1.52, 1.36
1.42, 1.23, 1.20, 1.13, 1.09, 1.00, 0.92
a) Plot concentration, c, vs. time, t, ln c vs. t, and 1/c vs. t.
b) Decide whether the data best fit zero-order, first-order or second-order kinetics and calculate the rate constant (with units (!!!)).

A simple random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Construct the 98% confidence interval estimate of the population mean.

2 0 1 2 3 2 1 0 1 4

1 3 2 0 1 1 2 3 1 2

1 0 0 5 0 2 2 1 0 2

A) 1.0 cars < μ < 2.0 cars

B) 0.9 cars < μ < 2.1 cars

C) 1.3 cars < μ < 1.7 cars

D) 1.5 cars < μ < 2.0 cars

The fill amount of bottles of a soft drink is normally​ distributed, with a mean of 1.0 liter and a standard deviation of 0.06 liter. Suppose you select a random sample of 25

bottles.

a. What is the probability that the sample mean will be between 0.99 and1.0 liter​?

b. What is the probability that the sample mean will be below 0.98 liter?

c. What is the probability that the sample mean will be greater than 1.01 ​liters?

d. The probability is 90​% that the sample mean amount of soft drink will be at least how​ much?

e. The probability is 90​% that the sample mean amount of soft drink will be between which two values​ (symmetrically distributed around the​ mean)

3.19 A gas with adiabatic exponent γ is compressed adiabatically from an initial state (Pi, Vi) to final state (Pf, Vf). (a) Show that the work done in this process is

W=((ViPi)/y-1)*[(Vi/Vf)^(y-1) -1]

(b) Evaluate the result numerically for one mole of helium gas initially
at P = 1.0 atm and T = 300 K compressed to half its initial volume.
(c) Compute the work done in an isothermal compression from the same
initial point to half the initial volume. Explain the difference between
the numerical results for work done in adiabatic and isothermal
compression.

The following sample data have been collected from a paired sample from two populations. The claim is that the first population mean will be at least as large as the mean of the second population. This claim will be assumed to be true unless the data strongly suggest otherwise.

Population Data

1. State the appropriate null and alternative hypotheses.
2. Based on the sample data, what should you conclude about the null hypothesis? Test using α = 0.10.

The single most important use of the element gold is for wires that join integrated circuits to the conducting pads that then connect microelectronic chips with external circuitry. A typical application uses gold wires 1.0 milmil (0.001 inch) in diameter and 45 milmil long. Although the current under normal conditions is much less, such a wire will fuse (that is, melt and interrupt the current) when the current exceeds some 660 mAmA.

A) Find the current density in the wire when this maximum current is flowing.

B) Find the electric field in the wire when this maximum current is flowing.

C) Find the voltage between the ends of the wire when this maximum current is flowing.

Write a DTD for this XML document such that the corrected version of the example is a valid XML document

<?xml version="1.0"?>

<computers>

<item type = "Laptop" code = "Dell437">

   <make>

   <brand>Dell Inspiration</Brand>

   <supplier id = "Dell"/>

   </make>

   <spec>

   <cpu speed = "900"/>

   <harddisk size = "12" units = "GB"/>

   </Spec>

   <price n = "950" units = "USD"/>

</item>

<item type = "Desktop" code = "Apple1679">

   <make>

   <brand>Apple iMac</brand>

   <supplier id = "Apple"/>

   <make>

   <spec>

   <cpu speed = "1100"/>

   <harddisk size = "16" units = "GB"/>

   </spec>

   <price n = "790" units = "USD"/>

</item>

</computers>

PLEASE SHOW WORKING AND FORMULA STEP BY STEP. DO NOT USE EXCEL

A surface water sample of 50 ml was taken to determine the concentration of an organic pollutant in the sample. An organic solvent was used as extracting solvent. On analysis of both phases by GC-MS, the pollutant concentration (mass/vol based) in the organic phase was 5 times that found in the aqueous phase. If after the second extraction (each using 50ml fresh organic solvent) the concentration of pollutant in the organic phase was 18 ppm (mass basis), determine the initial mass of pollutant in the water sample before any extractions were carried out. The density of solvent used is 0.65 g/ml & of water is 1.0 g/ml.

A filtration component consists of a rectangular channel having dimensions H = 10 cm, W = 50 cm, and L = 100 cm, containing carbon pellets of diameter 5 mm, is modelled using the Ergun equation. Develop the pressure drop versus mass flowrate (for ?̇ in the range of 1 – 50 kg/s) characteristic for the following porosities (due to packing arrangement): ? = 0.5, 0.7, and 0.9. The fluid properties may be taken to be ρ = 1000 kg/m3 , μ = 1.0 × 10-3 Pa⸱s. What is the pressure drop when ?̇ = 50 kg/s? Is it better to operate three filters in series or in parallel? Why?