Wednesday

September 28, 2016
Total # Posts: 19

**chem**

In the formation of sulfur hexaflouride, does the reaction at constant pressure or volume proceed more spontaneously? I've done the calcs to show that at constant volume, it is slightly more spontaneous, but I can't seem to find a good reason why... it might have ...

*January 28, 2008*

**Chem**

In thermodynaics, what is the relationship between enthalpy (H) and heat (q) - [at constant pressure]?

*January 27, 2008*

**Physical Chemistry**

In terms of bomb calorimetry, can one assume the temperature of the water surrounding the cmopartment is equal to the temperature within the compartment? If not, how would one determine T for the reaction occuring inside the compartment?

*January 26, 2008*

**French**

Can the words "les hommes du maison" be translated to both "the men of the house" and "the men from the house" or just one of them?

*January 5, 2008*

**drwls & Damon - maths**

hey guys, i follow you up to the point of intergrating the final line. How would I intergrate [x^-2.e^-x] dx thx

*December 29, 2007*

**Mathematics**

Solve the following differential equation, i.e. solve for y: dy/dx - y/x = 1/x + y + 1 I have this so far, 1. dy/dx= (y + 1 + xy + x)/x 2. x dy = (y + 1 + xy + x)dx 3. Integrate both sides... xy + c = xy + x + .5x^2y + .5x^2 + k where c and k are constants 4. c = x + .5x^2 (y...

*December 29, 2007*

**French**

What is the main linguistical difference between the phrases; 1. Je m'en vais and 2. J'y vais

*December 14, 2007*

**maths**

how would i solve the differential equation dx/dt=-kx^2 i.e. solve for x as a function of t. I've been told to rearrange the equation to yield dx/x^2=-k dt but what can and should I do now?

*December 14, 2007*

**Math**

d/dx x^2+3x = 2x+3

*December 5, 2007*

**Mathematics**

Solve d/dx x(ln(x)-1) I had: =d/dx xln(x) - d/dx 1 =d/dx ln(x)^x =x^(-x-1) [and this is wrong] Can someone show me the correct answer and working please?

*December 5, 2007*

**Mathematics**

Differentiate ln(x)-1 I have d/dx lnx-1 = d/dx(ln x)- d/dx1 = d/dx(ln x) = 1/x Could you tell me if this is right or not? If not, please suggest the right working out.

*December 4, 2007*

**Reposted: Maths - Trig**

I've been told that sin(c+h)=sin(c)xcos(h)+cos(c)xsin(h) but how? please explain

*December 2, 2007*

**Maths-Trig**

How does sin(c+h)=sin(c)xcos(h)+cos(c)xsin(h) please explain

*December 1, 2007*

**Physics - Electricity**

Can you please check my answers. 1) What carries energy through wire? electrons 2) What happens to some of the energy when it moves through the wire? becomes lost due to the movement of energy requiring some kinetic energy 3) If a resistance is large, why does the wire heat up...

*November 24, 2007*

**Maths-Logs**

when writing log b to base a, (log-a(subscript)-b), can a be less than 0?

*November 23, 2007*

**Sport - Football**

In FLAG FOOTBALL, how many players are allowed on the field at one time and what are their positions' names? Please help, I'm in Australia and Football just ain't as big as it is in some other countries.

*November 21, 2007*

**math**

diameter= sqr[(6^2+(-2)^2)+(4^2+0^2)] therefore, radius= (sqr[(6^2+(-2)^2)+(4^2+0^2)])/2 = ?

*November 10, 2007*

**math**

see my other response

*November 10, 2007*

**CHEM**

HOCl forms from OCl- + H+ and vice versa. the anion is hypocholrite (OCl-). Given the attaching proton is positively charged and out of O and Cl, O is more nucleophilic (Cl has the highest electronegativity), the H will attach to the O atom making the oxygen the cetral atom. I...

*November 10, 2007*

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