Tuesday
July 29, 2014

Posts by C


Total # Posts: 331

business math
If the Powershooter 1800 is marked up 58.50 what is the cost and the percent markup cost?

Statistics
A procedure in regression analysis where Predictor or Independent Variables are coded as 1 or 0 (representing categories) and can be used to produce ANOVA Tables under the General Linear Model is known as…?

Chemistry
A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

all
I rarely do my homework. No matter how hard I try to focus and actually get things done, I just can't do it unless it's something I really want to/like to do. And even if I actually put my work right in front of me and turn off my phone, computer, tv, etc. and sit in s...

geomertry
You eat a new kind of fruit and suffer from hives for the first time in your life. A week later, you try the fruit and the hives recur. A month later, you have a similar experience. conclusin

Chemistry
calculate q , w , and ∆ E for melting 1.00 mol of ice at 0 ◦ C and 1.00 atm pressure

Calculus
Solve dy/dx for sin(xy)=1+x^3-y^2

Accounting Theory
I think this is right up to expected income. Don't you have to add the Good State x .60 and the bad state x .40 to arrive at expected income? And you take the present value of goodwill in the valuation.

Chemistry H
120 ml of a gas is in a flask at STP. If the gas is argon, what mass of gas is in the flask?

Chemistry H
For the decomposition of aluminum oxide at 35 celsius and atm, what volume of oxygen gas will be produced if 2.77 grams of the oxide react?

Chemistry H
Find the molality, mole fraction, and percent by mass of a solution prepared with 500 grams of C12h22O11 in 2000 grams of H20

Chemistry H
60.0 grams of Th-210 with a half life of 50,000 years is allowed to decay for 250,000 years. How much of the original quantity remains? In addition, Th-210 decays via beta emission. Write the equation for its transmutation.

Chemistry
What is the (a) molality, (b) freezing point, and (c) boiling point of a solution containing 2.29 g napthalene (C10H8) in 44.6 g of benzene (C6H6)?

Chemistry
I'm having trouble balancing this equation: SO3^2- --> S2O4^2- It's in a basic solution. Thanks.

Chemistry
Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10^-59. Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the concentration of Ca2 in this solution if [OH–] is somehow fixed at 5.30 × 10^-6 M?

Math
How would I find the confidence level (in %) if I am given the standard deviation, size of the random sample, and confidence interval?

Statistics
How would I find the confidence level (in %) if I am given the standard deviation, size of the random sample, and confidence interval?

Chemistry
When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

Chemistry
When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

Calculus
Yes...very nasty! Thanks

Calculus
No, the equation is 5x^2-2xy+7^y Last term has 7 to the y power....

Calculus
Implicit differentiation of 5x^2-2xy+7^y

College Physics
A child's toy consists of a toy car of mass 0.100kg which is able to roll without friction on the loop-the-loop track shown. The car is accelerated from rest by pushing it with force F over a distance d, then the car slides with a constant velocity until it encounters the ...

Chem
what is the pOH of a 0.12 M solution of pyridine (Kb=1.4x10^-9) at 25 Celsius

Chemistry
What is the hydronium ion concentration in a 0.010M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11.

Chem
in a 0.40 M solution of diprotic acid H2A(Ka=7.4x10^-5, Ka2=5.0x10^-10 at 25 celsius), what is the equilibrium concentration of A^2-? A)0.40m b)0.80M C)5.4x10^-3m d)1.4x10^-5M E)5.0x10^-10M

Quantum Physics
a)00> = 1/sqrt2 |01> = 0 |10> = 0 |11> = 1/sqrt2 b) 4

Cosmology
The majority of galaxies (by number) are: lenticulars barred spirals dwarfs giant ellipticals

Cosmology
What explains the observation that galaxy clustering is stronger at higher redshifts, which is an apparent reversal of the trend out to about z ~ 1? It is difficult to measure peculiar velocities Rich clusters have more galaxies than poor clusters Density contrast seems to gro...

Cosmolgy
Which of these is the correct relationship between b, the bias factor, the fluctuations in mass (Δρ/ρ)mass and the fluctuations in light (Δρ/ρ)light? b2(Δρ/ρ)light = (Δρ/ρ)mass−1 (Δρ/ρ)light ([...

Cosmology
What can we say about the future evolution of irregular clusters? They will become less centrally concentrated and assume a roughly uniform spatial density. They are not yet in a dynamical equilibrium, but will likely reach it eventually. They will keep contracting until they ...

Cosmology
magine you look through a really strong telescope and see a rich cluster. Your telescope is so good that you can see a single galaxy at the center of the cluster. What can you say about that galaxy and be pretty confident that you are correct? It has mass smaller than that of ...

Cosmology
We see less cluster evolution at larger redshifts

Cosmology
Which of the following is evidence that the evolution of disk galaxies can be greatly affected by their large scale environment? Comparison of emissions from elliptical galaxies in x-ray and optical bands Hydrogen gas deficiency in spiral galaxies near cluster cores The abunda...

Cosmology
The Hubble sequence is useful for distinguishing galaxies on the basis of many properties. Which of these does not correlate well with Hubble type? stellar age dust content luminosity color

Cosmology
Which type of emission closely traces the star-forming regions of a galaxy? none of these coronal X-ray emission 21 cm emission molecular CO emission

Cosmology
Which of the following statements is not true of spiral arms: they tend to trail the rotation of the galaxy they are sites of star formation they are amplified by resonances between the epicyclic frequencies of stars and the angular frequency of the spiral pattern they arise s...

geometry
triangle abc is similar to def, the lengths of the sides of triangle abc is 5,8,11. what is the length of the shortest side of triangle def if its perimeter is 60?

Geometry
line segment ab is the diameter of circle O whose center has coordinates (6,8) . what are the coordinates of point b if the coordinates of point a are (4,2)

Geometry
line segment ab is the diameter of circle O whose center has coordinates (6,8) . what are the coordinates of point b if the coordinates of point a are (4,2)

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?

Chemistry
not right after the conversion 1KJ/mol=1.03*10^-2EV

chemistry
its not right with 39.2 and after conversion with 1KJ/mol=1.03*10^-2EV. Any ideas or thoughts on b)?

Chemistry
Thanks for a) any thoughts on b)?

Chemistry
So what is a) and what is b)?

Chemistry
conversion for seconds to hours is 60*60 or multiply 3600.

Chemistry
How do you input the data into the formula?

Chemistry
not right

Chemistry
Shown below are several options for the box notations of the ground state electron configuration of the following gas-phase species. Identify the correct electronic configuration. i. Al2− ii. Mn (a)Select the reason that best explains why the first ionization energy decr...

Chemistry
Which is the higher density of polyethylene, linear or branched? Select the choice with the best accompanying explanation. Linear polyethylene is the higher density form, as the chains are able to pack better and partially crystallize, resulting in better packing and higher d...

Chemistry
pls. c

chemistry
Shown below is a schematic representation of the water-ethanol phase diagram. Making reference to the phase diagram, explain in a few sentences how one could enrich a solution of 15 percent ethanol - 85 percent water to a composition of 60 percent ethanol - 40 percent water. B...

chemistry
pls. tell

Chemistry
1) Cubic 2) Simple cubic 3) Cs+Cl− pair

world history
If you mean Britain was the archenemy of the USA and France. Then lets check the two country out.(A quick breakdown) USA fought two wars with Britain but due to WWI, Britain became allies with the USA for support and troops and the WWII as the Axis/Japan bomb Pearl Harbor. Fra...

Chemistry
(a) is right and the (b)?

Chemistry
Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the (001) plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a wavelength λ=3.09...

Chemistry
Thank you!

Chemistry
Thanks for the help but it Wasn't right!

Chemistry
Name the following crystallographic features below using proper crystallographic notation. Image One [2ˉ21] [1ˉ12ˉ] [1ˉ1(1/2)] [(1/2)(1/2ˉ)1ˉ] Image 2 (1ˉ02) (21ˉ0) (201) (1ˉ02ˉ)

Chemistry
An x-ray generator operated at a plate voltage of 7000 V is incapable of producing Ni Kα radiation. Calculate the minimum energy required for a ballistic electron to produce Ni Kα radiation. Express your answer in units of eV.

Chemistry
CdO is cubic with a lattice constant a=4.695 A˚ and a density ρ of 8.15 g/cm3. Determine the crystal structure of CdO. Simple Cubic Face Centered Cubic Body Centered Cubic

Chemistry
Thank you

Chemistry
Calculate the density of atoms along [011] in molybdenum (Mo). Use only the information provided in your class Periodic Table, and express your answer in units of atoms/cm.

Chemistry
(a) Calculate the lattice constant a in palladium (Pd). Use only the information available in the class Periodic Table, and express your answer in angstroms. (b) Calculate the distance (in angstroms) between adjacent (110) planes in palladium (Pd). Hint: use your work from par...

Chemistry
Thank you!

Chemistry
The crystal structure of cesium chloride (CsCl) is shown in the figure below. The dark spheres represent atoms of Cl. Identify the crystal system: Cubic Tetragonal Orthorhombic Rhombohedral Hexagonal Monoclinic Triclinic Identify the Bravais lattice: Simple cubic Body Centered...

chemistry
thanks

chemistry
0.388e-6

Chemistry
thanks

Chemistry
1) True 2) False

Chemistry
The conduction band is at a higher energy than the valence band. True or false? No electronic states lie between the conduction and valence bands in n-type silicon. True or false?

Chemistry
thanks

Chemistry
thanks

Chemistry
thanks

Chemistry
Multi-electron Atom Ionization Energy, Conservation of Energy, Wave-Particle Duality.

chemistry
10.4

chemistry
(Kg of Na)/ 23*4 =X X * 47.88 = in g convert to Kg

Chemistry
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

Chemistry
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

Chemistry :(
10.4

chemistry
p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

chemistry
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

chimistry
p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

Chemistry
-422.24

Chemistry
10.4

Chemistry
(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg

chemistry
p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

chemistry
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

chemistry
-422.24

chemistry
p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

chemistry
10.4

chemistry
(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg

science
p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

science
10.4

science
(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg

science
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

alegebra and graphing
y=m=25

Math (Please help immediately)
Last one I need help on: The measure of one angle is 38 degrees less than the measure of its supplement. Find the measure of each angle.

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