Sunday
April 20, 2014

Posts by K


Total # Posts: 722

Math
Why the possible sets are 2^5?

Geometry
wrong

Geometry
Explain, please?

chemistry
Pipette 3 drops of oil into a test tube of water and shake. Describe what takes place and why? - Would it be the oil settles at the top of the water, because the oil is less dense, and its a non-polar substance, so it doesn't mix with a polar substance (water). Add 1 scoop...

chemistry
Ok, well it gives us the equation: CH4 + 2O2 --> CO2 + 2H20 ( I balanced it) And then it asks us to calculate: deltaHf (#of mol) I think we have to do that using the mole ratio and the balanced equation? Sorry if it's confusing :/

chemistry
How do you calculate deltaHf using the # of moles from a balanced equation? How do you connect the Law of Conservation of Energy to a Thermochemical Equation? Thanks so much!

government
What exactly is the war going on between the U.S. and Pakistan? Is it because the U.S. though Bin Laden was in Pakistan? Also is that war and the Afghanistan war still going on? From what I researched, they still are.

government
Is fiscal policy the same thing as a fiscal cliff? If not, then how do they differ? Also what are some important policies in foreign countries that affected citizens their citizens?

organic chemisty
acid based reaction takes place.

World History
Thank you :)

World History
Sorry, I meant the decade of 2000-2010

World History
What policies affected the citizens during the 21st century? For example: In the U.S. we had the Homeland Security Policy

math 4th grade
All you have to do is add 16/24 and 15/24

Chemistry
Thanks for your help! Makes lots of sense :)

Chemistry
Ah, ok, so another question I have is how would you determine which elements are oxidized and reduced?

Chemistry
I'm having a little trouble determining oxidation numbers for elements in a redox reaction KMnO4+HCl--> MnCl2+Cl2+H2O+KCl So far what I have for the reactants side is: K= +1 Mn= +7 O4= -2 H= +1 Cl= -1 And for the products side I have: Mn= +2 Cl2= -1 Cl2(diatomic)= 0 H2=...

physics
The figure below shows two current carrying wires and the directions of the currents they carry. The wires carry the following currents: I1 = 12.5 A and I2 = 9.8 A. Wire 1 is at (0, 4.0) mm; wire 2 is at (13.3, 0) mm; point P is at (13.3, 4.0) mm. webassign. net/userimages/two...

chemistry
If 8.72 grams of oxalic acid, H2C2O4, a diprotic acid, is neutralized when 23.4 mL of a solution of KOH is added, what is the molarity of KOH? the topic is acid-base triation, and i have already converted the mass to moles,but I am having trouble finding the volume for the aci...

chemistry
ha :) thanks so much, that helps lots, i don't know why i was over thinking it! you're awesome!

chemistry
how do i predict a conjugate a base? Ex: HBr. The conjugate base is Br- a. NH4+ b. H2O c. H2PO4

Chemistry
use the formula (V1*P1)/T1 = (V2*P2)/T2 and make sure all the units are converted correctly, so i believe you just convert 325ml to .325 L, and then convert -125oC to Kelvin, and once you plug in all yours #s solve, and then convert it back to oC since you will have your answe...

English
What do stage directions tell the reader? Do they tell about characterization or about the setting?

statistics
ER promises you will be seen in 10 minutes. the standard deviation is 2 minutes. chance someone will wait more than 13 minutes. i dont know what to do without a population size or sample size

Stastics
average for all football teams was an 86 with variance of 16. the buckeyes program over the last 16 year was a 93. is there sufficient proof at the .05 level of significance to say buckeyes were higher than everyone else.

Geometry
What is the surface area and lateral area of a regular triangular pyramid if the slant is 7 and the altitude is 5?

chemistry
Pure water has a density of 1.00 g/ml at 297 . Calculate the molar concentration of pure water at this temperature. Would i just convert grams to moles, and ml to liters?

chemistry
left?

chemistry
H2 + CO2 <--> H2O + CO if there were something that were added to this system to absorb the CO2, where would the equilibrium shift? Please don't just give the answer, explain as well, thanks :)

chemistry
that makes sense, thanks for your help

chemistry
I think the question was asking for the Cl (aq) ions

chemistry
NaCl(s) + H2O(l) <--> Na(aq) + Cl(aq) If you added chloride ions to the above equilibrium, what would happen to the concentration of the products, and the concentration of the reactants? I know the equilibrium would shift to the left, and I am guessing the concentration ...

Math
30?

chemistry
For the reaction CO2 + H2 <--> CO + H20 + heat, indicate how the change in condition will shift the equilibrium (ie right or left) a. Removal of CO2 b. Addition of H2 molecules c. Increase volume of reaction vessel d. Addition of catalyst e. Refrigerate reaction vessel

aig math
Pat= x , Kyle= y, Ryan= z x+y+z= 306 2x= y+z z+18=y So from here, you just plug the equations into each other... 2x= y+z so, 2x= (z+18)+z so, 2x= 2z+18 so, x= (2z+18) /2 Then you plug this in to the equation: x+y+z= 306 So... (2z+18) /2 + (z+18) + z = 306 Then, 4z+38 = 612 4z ...

aig math
so just do this... 8x+6x+9x then you know that 8x+6x= 84 so, 14x=84 so, x=6 then you multiply 6 by 9, and your answer is 54 marbles

chemistry
Thanks so much! :)

chemistry
At a certain temperature, the concentrations of NO and NH3 are equal, and the concentration of H2o and o2 are 2.0M and 3.0M respectively. What is the value of Keq at this temp? The equation is 5O2+4NH3--> 4NO+6H20

Math
determine the equation of a line that passes through (2,1) and is parallel to the line 3x-7y=5

college algebra
A rectangular box with no top is to be constructed from a 10 in. x 10 in square piece of cardboard by cutting equal square of side x from each corner and then bending up the sides. Write the volume of the box as a function of x.

algebra 2nd try
(2√3:((49)^(2)))/(49)

college algebra
A rectangular box with no top is to be constructed from a 10 in. x 10 in square piece of cardboard by cutting equal square of side x from each corner and then bending up the sides. Write the volume of the box as a function of x.

college algebra
A roll of 640 feet of chicken wire is used to enclose a rectangular vegetable garden.Express the area A of the garden in terms of its length (x)

Math
C.because it takes 3 min per problem which equal out to 8 problem in 24 min and in 54 min you can solve 18.

college algebra
A rectangular box with no top is to be constructed from a 10 in. x 10 in square piece of cardboard by cutting equal square of side x from each corner and then bending up the sides. Write the volume of the box as a function of x.

college algebra
A roll of 640 feet of chicken wire is used to enclose a rectangular vegetable garden.Express the area A of the garden in terms of its length (x)

Math Ms. Sue please
help

math check answer
what is true a a trend line data

chemistry
why is it necessary to try and keep the temperature constant during an experiment of determining pKa by pH measurements?

chemistry
how do i calculate the NaOH molarity from a titration of KHP and NaOH after preparing KHP to standardise NaOH. KHP mass was 2.0378g dissoveld in distilled water to fill up a 100ml volumetric flask and only 10ml of this solution was used to in titration

business math
Oprah Winfrey ha closed on a 42- acre estate near Santa Barbara California for $50,000,000 If Oprah puts down 20% down and finances at 7% for 30 years what would be her monthly pay payment.

physics
Object I is a solid cylinder with diameter d has resistance R. What would be resistance of another object made of the same material and with the same mass as Object I but has the cross section shown below (it is a hollow cylinder with outer diameter 2d and inner diameter d). R...

physics
Object I is a solid cylinder with diameter d has resistance R. What would be resistance of another object made of the same material and with the same mass as Object I but has the cross section shown below (it is a hollow cylinder with outer diameter 2d and inner diameter d).

physics
Light bulb packages will have at least two numbers on them; a power and what the potential difference across the bulb must be so that the bulb has the listed power. You go to the store and purchase two light bulbs. The package for Bulb A says 40 W in a large font with 120 V in...

physics
The figure below shows a collection of wires. The currents at the numbered points are: I1 = 2.4 mA right; I2 = 3.6 mA down; I3 = 0.60 mA right; I4 = 4.0 mA up; and I5 = 1.6 mA up. i. imgur. com/SCyljHG. png a. What is the current at point A (size and direction)? b. What is the...

Chemistry
just kidding i figured it out

Chemistry
On Easter Sunday, April 23, 1983, nitric acid (HNO3) spilled from a tank car near downtown Denver, Colorado. The spill was neutralized with sodium carbonate (Na2CO3). 2HNO3(aq) + Na2CO3(s) -> 2NaNO3(aq) + H2O(l) + CO2(g) deltaH=-69.0kJ a. How much heat is released by the ne...

business
Pikes Peak Harley Davidson. offered to finance a new motorcycle for qualifying customers at 15% downer 7.5% interest for 48 months during July 2009 Rich Martinez was interested in calculate what his monthly payment would be if he bought a $29,386 bike.

physics
A parallel capicitor is made of two plates with cross sectional area A which are separated by a distance d (with a vacuum between the plates). The capacitor is connected to a battery until a charge Q is stored on it and a total potential difference VC is measured across the pl...

Math
If you multiply 100!*200!*300!, how many 0s are there?

calculus help please!
I know you got 8 from because it is the radius but can you explain why you are using cot?

MATH VERY URRRGENT!!!!!!!!!!!!!
one of them was wrong

Chem
Thank you so much

Chem
In procedure B2, you will titrate a saturated solution to find out how much of the anion dissolved. Assume you we're able to dissolve about 0.12g of potassium hydrogen tartrate in 25.0 mL of water. For the titration, you will use 10.00mL of this sample. How many mL of 0.05...

Geometry
110

Chemistry
Sodium azide (NaN3) yields N2 gas when heated to 300 degrees Celsius , a reaction used in automobile airbags. If 1.00 mol of N2 has a volume of 47.0 liters under the reaction conditions , how many liters of gas can be formed by heating 35g of NaN3? The reaction is 2Nan3------&...

economincs
The price elasticity of demand for imported whiskey is estimated to be −0.20 over a wide interval of prices. The federal government decides to raise the import tariff on foreign whiskey, causing its price to rise by 20 percent. a. Will the quantity demanded on imported w...

Chem lab last question!! Urgent help
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of treating 1000 lb of ice on a surface to produce a solution that melts at -3.9 degrees Celsius with each chemical. I know you use to delta T= mkfi bu...

Chem please help urgent
why is the formation of a condensation polymer impossible in these cases ? A) ethanoic acid + NH2CH2CH2CH2CH2NH2 B) ethanoic acid+CH3CH2NH2 C) HOOC-CH2-COOH + CH3CH2NH2

Chem please help me I need help
I am having trouble on this please help Indicate which of these statements is true? For those that are false,.explain why a) addition reactions always involve compounds with multiple bonds b) all addition reactions produce polymers, but not all polymers are addition polymers c...

Chem please help
why is the formation of a condensation polymer impossible in these cases ? A) ethanoic acid + NH2CH2CH2CH2CH2NH2 B) ethanoic acid+CH3CH2NH2 C) HOOC-CH2-COOH + CH3CH2NH2

please help me on chem
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of treating 1000 lb of ice on a surface to produce a solution that melts at -3.9 degrees Celsius with each chemical. I know you use to delta ...

chemistry
I am having trouble on this please help Indicate which of these statements is true? For those that are false,.explain why a) addition reactions always involve compounds with multiple bonds b) all addition reactions produce polymers, but not all polymers are addition polymers c...

chemistry
Pleaseeeee helpppp me

chemistry
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of treating 1000 lb of ice on a surface to produce a solution that melts at -3.9 degrees Celsius with each chemical. I know you use to delta T= mkfi bu...

Chemistry
My teacher say I don't have to show any calculation so how do I explain it using the graph I have for both??

Chemistry
So nacl is effective in both cases

Chemistry
So nacl is effective in both cases

Chemistry
Sorry wrong post

Chemistry
I found molality of urea but I am not sure how to do after

Chemistry
I have o.236 g for urea and 0.235g for NaCl. And the question is On a gram basis, which is more effective in depressing the freezing point, urea or NaCl? On a mole basis, which Is more effective? I am confused on what depressing the freezing point me and idk how to explain the...

Algebra
The answer is x=1 :)

Science
I need to calcuted the molarity from this 12.5 g of ethylene glycol antifreeze dissolved in o.100kg of water. Density of solution is 1.0 g/mL I know molarity if mole of solute / L of solution. I am confused on how to find the L of solution. Do I add 12.5 and .100g to get the s...

Chemistry
But that one was density of solution, but this problem is density of water so is that different???

chemistry
what are the fundamental particles in antifreeze

English Plz Help
help

college chem
I am still very confused

college chem
Thank you but I am not sure what you mean by derive it

college chem
A researcher explores the ideal gas equation. He measures the pressure of a system at different temperatures ( keeping the volume and moles of the gas constant) and creates a plot of P versus T. What is the slope of the line that results if the volume is 1.0L when 1.0 mol of g...

organic chem
i. imgur. com/J6VpPrc. png what is the mechanism (electron pushing) of this reaction?

science
how much water can dissolve in 700ml of water at 50 c?

calculus
three bowls are filled to a depth of four units. a paraboloid, z=x^2 +y^2 for 0<z<4, a cone z=(x^2 + y^2)^(1/2) for 0<z<4, and a hyperboloid z=(1+x^2+y^2)^(1/2) for 1<z<5. which bowl holds more water?

physics
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = 60 cm. When wearing his glasses, he looks not at actual objects but at the virtual images of those objects formed by his glasses. Suppose he looks at a 10-cm-long pencil held verti...

organic chemistry
you divide that by 2 so it's 1

organic chemistry
there is only 1 degree of unsaturation

organic chemistry
what is this compound, it has a mf of c6h12o i. imgur. com/gCgw0Hi. png

physic 108
A charged nonconducting rod, with a length of 3.83 m and a cross-sectional area of 5.69 cm2, lies along the positive side of an x axis with one end at the origin. The volume charge density ρ is charge per unit volume in coulombs per cubic meter. How many excess electrons ...

Design
New Wave

physics
A 91.0 N grocery cart is pushed 17.1 m along an aisle by a shopper who exerts a constant horizontal force of 42.0 N. The acceleration of gravity is 9.81 m/s2 . If all frictional forces are neglected and the cart starts from rest, what is the grocery cart’s final speed? An...

math
The perimeter of the office bulletin board is 24 ft. The perimeter of the sandbox is 1 1/2 times as long. What is the perimeter of the sandbox?

Physics
A spaceship of mass 2.3×10^6 kg is cruising at a speed of 6.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 5.2×10^5 kg, is blown straight backward with a speed of 2.0×10^6 m/s. A second pi...

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