Homework Statement
I was asked to calculate the pH of .40M solution of NH4ClO4
but I wasn't given a Ka for it.
Homework Equations
The Attempt at a Solution
I dissciated NH4ClO4 into:
NH4(plus) and ClO4(minus)
but I"m stuck there. What am I doing wrong?
Homework Statement
What's the 39th derivative of cosx?
Homework Equations
1st dy/dx: -sin x
2nd: -cosx
3rd: sinx
4th; cosx
The Attempt at a Solution
So it repeats every 4
so I used 39/4 and for a remainder of 3 so is is the 3rd one down?
I got sin x but I don't know...
Homework Statement
is( X^2 )y + (Y^2)x = 6, then the second derivative at the point (1,3) is ?
Homework Equations
The Attempt at a Solution
I don't see how this is possible, when I plug in 1 and 3 it comes out as 9 = 6 which isn't true. Can someone tell me if this is wrong? or...
Homework Statement
A piece of iron weighing 85.65 grams was burned in air. The mass of the iron oxide produced was 118.37g.
1. Use the law of conservation of mass to calculuate the mass of oxygen that reacted with iron.
2. use the molar mass of oxygen to calculate the number of moles...
Homework Statement
Radiation with the wavelength 5.0x 10^-6 Meters belongs to what region of the spectrum ?
Homework Equations
None really.
The Attempt at a Solution
I don't really know how to read the spectrum too well, but it looks like Infared, am I right?
Homework Statement
A carbon-Oxegen double bond in certain organic molecules absorbs radiation that has a frequency of 6.0 x 10^13 s^-1
A. What is the wavelength of this radiation?
B. What is the energy of this radiation per photon? per mole of photons?
Homework Equations
The Attempt at a...
1. Homework Statement [/b]
A cyclist is riding on a path modeled by f(x)= 0.08x where f and f(x) are measured in miles. Find the rate of change in elevation when x = 2
Homework Equations
(f(∆x + x ) - f(x))/∆x
∆x\stackrel{lim}{\rightarrow} 0
The Attempt at a Solution
I...
Homework Statement
Tan^{2}X - 1 = 0
Homework Equations
The Attempt at a Solution
I added 1 to both sides, then I took the square root of both sides giving me:
tan x = \pm1
which gives me answers at pi/4, 3pi/4, 5pi/4 and so on.
Do I just write pi/4 + 2kpi as my answer?
Homework Statement
Sin ^{4}X - cos^{4}X
Homework Equations
The Attempt at a Solution
I'm just checking if I can switch the sin and cos at the beginning to make:
-Cos^{4}X + Sin^{4}X
Then multiply by -1 to basically switch the the Sin and Cos around?
I'm supposed to...
Homework Statement
2sin(2x) - \sqrt{3} = 0
Find the value of the variable.
Homework Equations
Sin(2x) = 2SinxCosx
The Attempt at a Solution
I subtracted root3 and then divided everything by 2 which leaves me with
sin (2x) = \sqrt{3}/2
then I used the double angle identity to change...
Homework Statement
(n/(n-1)) x (1/n) x (n/(n+1)) = 5/k for positive integers n and k, what is the value of k>
Homework Equations
The Attempt at a Solution
I multiplied the left side out to be (n/(n^2-1) and set it equal to 5/k
I got stuck right there.
Homework Statement
In a Mixture of peanuts and cashews, the ratio by weight of peanuts to cashews is 5 to 2. how many pounds of cashews will there be in 4 pounds of this mixture?
Homework Equations
The Attempt at a Solution
I used 5/2 as seven pounds in the original ratio...
Homework Statement
How many significant figures in each?:
-214
-81.60
-7.03
-.03
-0.0086
-3236
-8700
I don't quite understand this (I'm self studying, need a little help :) )
If got them all right then can someone explain the concept of significant figures?
I hate knowing only...
Homework Statement
Dimensions: These derivations are not correct ( as stated by the book)
I'm just reading my textbook at the moment and I saw this example ( So I don't have work for it myself by the book shows all the steps).
***√[L]/[L/T^2] =√[T^2]
Homework Equations
The...
Homework Statement
Would 85 uV (Micro) be 8.5 x 10^-5 V ?
And would 600ps be 6x 10^-10 S ?
Ehhh I havent slept in weeks, I just can't focus.
Homework Statement
Homework Equations
The Attempt at a Solution
I used the fact that 1u = 1x 10 ^-6 and then I used 1V/1000000uV x (85 uV)...