Laura

[Os(CO)5] and [Re(CO)5]- are isoelectronic complexes. which has:

1) the highest CO IR stretching frequency

2) the shortest carbon-oxygen bond

3) the shortest metal-carbon bond

Does [Os(CO)5] have the highest CO stretching frequency?

Any help would be great, thank you.

Is it [Cu(tu)3]SO4 or is that wrong?

i really need help please and thank you.

What is the function of thiourea that causes it to dissolve copper powder? I tried to look it up but cant find any information about it really.

if anyone could help me it would be appreciated.

I did an experiment reacting copper(II) sulfate pentahydrate with thiourea to form tris(thiourea)copper(I) sulfate.

So for the equation I have CuSO4.5H20 + CS(NH2)2 = [Cu(NH2CSNH2)3]SO4

I'm not sure if this is right, should there be more side products, such as water? etc.

any help would be great, thanks.

1000 ml ?

Any help would be appreciated, thank you.

this is what I have calculated:

25% = 0.25

0.25 x 50 cm^3 = 12.5g sodium methoxide

so then 12.5g of sodium methoxide would be dissolved in 37.5 cm^3 of methanol?

any help would be great, thanks, just want to know if i'm calculating it correctly.

1) The part of the cylinder x^2 + y^2 = 4 that lies between the planes z = 1 and z = 4.

2) The part of the plane z = x + 2 that lies inside the cylinder x^2 + y^2 = 1.

Im not sure what to do, if anyone could help me out I'd appreciate it.

∫ (from -1 to 1) ∫ (from 0 to sqrt(1-y^2)) sqrt(x^2 + y^2) dxdy

I'm not really sure how to change to polar coordinates, is 0<r<1?

Any help would be appreciated.

∫ (from -1 to 1) ∫ (from 0 to sqrt(1-y^2)) sqrt(x^2 + y^2) dxdy

Is x=sqrt(1-y^2) equal to x^2 + y^2=1? so that's a circle with radius 1?

So does that mean 0≤r≤1

If anyone could help I would appreciate it.

∫ (from -1 to 1) ∫ (from 0 to sqrt(1-y^2)) sqrt(x^2 + y^2) dxdy

Is x=sqrt(1-y^2) equal to x^2 + y^2=1?

I'm not sure how to change to polar coordinates... if anyone could help me out, I'd be grateful.

Let S be the lower hemisphere of radius a > 0 centred at the origin and let F(x,y,z) = (y, -x, 2).

Any help would be great, thank you.

Students enter a library on the average of two every three minutes. The waiting time until the first

student arrives can be modelled by an exponential random variable.

(a) Find the probability that it takes less than 3 minutes for the first student to arrive.

(b) Find the probability that it takes more than 5 minutes for the first student to arrive.

(c) Find the probability that it takes more than 2 but less than 6 minutes for the first student to

arrive.

If anyone could help me out, i'd be grateful.

(1) (Linear Transformation): x(u, v) = au + bv, y(u,v) = cu + dv

(4) (Rotation by an angle θ): x(u, v) = u cosθ - v sinθ, y(u,v) = u sinθ + v cosθ.

I am lost, if anyone could help i'd appreciate it.

An allegedly psychic animal's feeding behaviour is used to predict outcomes of eight soccer matches.

If we neglect the possibility of a draw and assume that the animal is picking the winner at random,

(a) what is the probability of correctly predicting the outcomes of all eight matches?

(b) what is the probability of correctly predicting the outcomes of less than eight matches?

(c) what is the probability of correctly predicting the outcomes of exactly 5 matches?

(d) what is the most likely number of match outcomes that will be correctly predicted by the animal?

Any help would be great, thank you.

(a) What is the probability that the sample contains no smoker? three or more smokers?

(b) Find the expected number of smokers and the standard deviation.

If anyone could help, it would be great, thanks.

and also how to integrate ∫ ∫ xe^x dxdy.

Both are double integrals, any help would be great, thank you.

Show that a geometric series

∑ ar^n where n=0

(b) converges to a/1-r , if |r| < 1 .

and

(d) diverges to -infinity, if r ≥ 1 and a < 0.

Any help would be thank you.

Find the limit of the sequence (n^2 - 4 / n+5) where n ≥ 1 .

If anyone could help me out it would be great, thank you.