ilockitdown

Calculate the activity ratios and activity of H4SiO4 of the water in

logarithmic scale; [K+]/[H+], [Na+]/[H+], and [H4SiO4].

Assume that the activity coefficient is 1 (you do not need to worry about the

activity coefficients of dissolved species).

Note: SiO2 dissolves in water to form H4SiO4, but the content of Si in water is

commonly expressed as SiO2

Table (charge in brackets)

HCO3 (-) = 103

SO4 (2-) = 42

Cl (-) = 16

NO3 (-) = 2.3

Ca (2+) = 30

Mg (2+) = 7.8

Na (+) = 9.9

K (+) = 3.0

SiO2 = 5.9

pH = 7.2

Concentrations are in ppm

How does K(1,2) = K = (P2-P1)/(T1-T2) turn into T(1,2) = ((P1*T2)-(P2*T1))/(P1-P2)

where K(1,2) is the K value from the first and 2nd measurements. P1 and P2 are the certain powers applied. ANd T is temperatures. other useful equations to manipulate this are P1 = K(T1-Tinitial) and P2 = K(T2-Tinitial) and P2-P1 = K(T2 - T1)

PLz show the steps, I don not understand how the manipulation of K(1,2) = K = (P2-P1)/(T1-T2) becomes T(1,2) = ((P1*T2)-(P2*T1))/(P1-P2)

Which is most responsible for ocean tides?

a. gravity from the moon whose force on the near side of the Earth is larger than its force on the far side of the Earth.

b. gravity from the moon and the sun, which add up at Spring Tides and subtract at Neap Tides

c. tilt of the Earth's axis.

d. none of the other responses is correct.

e. the rotation of the Earth about its axis

The initial frequencies for alleles in a small population are 20 homozygous dominant (AA), 30

heterozygous (Aa) and 10 homozygous recessive (aa). If all of the recessive individuals were

selected against and died, what would be the new allele frequencies and the number of

homozygous individuals (AA) in the next generation?

A) The frequency of A is 0.7, the frequency of a is 0.3 and 49% are homozygous in the next

generation

B) The frequency of A is 0.7, the frequency of a is 0.3 and 42% are homozygous in the next

generation

C) The frequency of A is 0.7, the frequency of a is 0.3 and 21% are homozygous in the next

generation

D) The frequency of A is 0.49, the frequency of a is 0.09 and 49% are homozygous in the next

generation

E) The frequency of A is 0.49, the frequency of a is 0.09 and 42% are homozygous in the next

generation

Could some1 do it step by step for me please? because I really don't know how to calculate this

I made a website dedicated to what happened between us, could you plz give advice?

http://ihatejade.com/?id=ymalyz3eciyggo3uz2ntfxb51...

Analyze the following rational function f(x)=2[(x^2-9)/((1-x)(x+2))]

In particular find the signs and the asymptotes of the function f, fill the blanks and state the critical numbers

a. The function f has the vertical asymptotes x= and x=

b. The function f has a horizontal asymptote: y=

c. The value of f at x= 0 is:

d. f(x)= 0 if x= and x=

Some fish population is described by the following discrete-time dynamical system:

N t+1 = (7-h) N t – 7 (N t)2

a) Find the non -zero equilibrium population N*(h) if it exists

b) Find the equilibrium harvest function P(h)=h N*(h)

c)Find the harvesting effort h0 which maximizes P(h) and the maximum equilibrium

harvest P(h0).

d) Find all the values of h for which N* (h) is stable

plz show step by step if possible

Fill the blanks and explain. The function: y=f(x) = (x^2)(e^-x)

has a local maximum for x=

has a local minimum for x=

sgn f” _______________________

the expression 4x^2 + 12 is underneath the square root