Wednesday
September 3, 2014

Posts by K


Total # Posts: 746

math
Explain, please?
June 7, 2013

chemistry
Thank you Dr. Bob
June 4, 2013

chemistry
Ok, so using Le Chatelier's Principle If you add heat to an exothermic reaction, the equilibrium will shift to the left. If you remove heat to an exothermic reaction, the equilibrium will shift to the right. What is it for an ENDOTHERMIC reaction? If you add a substance, ...
June 4, 2013

Finance
What does "loan amortization requirements" mean?
May 31, 2013

Chemistry
Yes, so in other terms, you are saying that exothermic reactions usually generate more, but endothermic reactions store more?
May 31, 2013

Chemistry
Ah ok, makes sense, thank you :) Also one more question if you don't mind, which produces more energy, exo or endo? Or does it depend on the delta H it gives you in the equation?
May 31, 2013

Chemistry
Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you
May 31, 2013

Chemistry
Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you
May 31, 2013

Eng
A is wrong because it should be its
May 27, 2013

Trigonometry
wrong man
May 27, 2013

MATHS
explain, please?
May 23, 2013

math
Why?
May 23, 2013

chemistry
Ok, so the shape of the metal affects the reaction rate, correct? And any shape, will increase the rate, right?
May 22, 2013

chemistry
If you add a metal piece to excess acid, what of listed factors below will increase, decrease, or have no impact on how fast a reaction happens? a) lower molarity (concentration) of a solution b) higher molarity (concentration)of a solution c) increase volume of a solution (...
May 22, 2013

Chemistry
Ok, so you just do .333/.333 =1 (NO) and .625/.333= 1.87 (O2) So, then you go back to your equation, and you see how 1 < 2(# of moles of NO in the equation), that means it is the limiting reactant Then you do the same thing with 1.87, and 1.87> 1( # of mole of O2), so ...
May 22, 2013

Chemistry
In order to find the limiting and/ or excess reactant, you have to first convert grams to moles, then once you have that you did the #s by the smallest mole #. Once you have that, you compare that to the coefficients of the balanced equation.
May 22, 2013

chemistry
Explain how dispersion forces, dipole-dipole forces, and hydrogen bonds (intermolecular forces) affect the 2 states of matter using phase changes and heating curves. What is the effect on vapor pressure with dispersion forces, dipole-dipole forces, and hydrogen bonds?
May 20, 2013

Chemistry
Thanks for all your help!
May 19, 2013

Chemistry
How many oxygen atoms are in a) 3.21 x 10^22 molecules CH3OH b) .250 mol C6H12O6 Is it a) 3.21 x 10^22 atoms b) 9.03 x 10^23 atoms
May 19, 2013

Chemistry
A bracelet containing .200 mol of metal atoms is 75% gold. How many particles of gold atoms are in the bracelet?
May 19, 2013

Chemistry
What are the Oxidation and Reducation reactions for these equations : BaCl2 + NaHCO3 -> BaCO3 + NaCl + HCl (carbon is the reduction reaction, but I don't know what the oxidation reaction is) CaCO3 + HCl -> CaCl2 + CO2 + H2O
May 19, 2013

chemistry
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e....
May 9, 2013

math
What if it is something like 0 = 5?
May 7, 2013

math
Ok, so when you are solving an equation, and you have an answer such as 5x=0 , does that mean that it is no solution or all real #s? And, when the answer is 4=4 , does that mean it is no solution or all real #s? And when the answer is 2x=2x, does that mean it is no solution or...
May 7, 2013

chemistry
Use the formula (V1*P1) / T1 = (V2*P2)/ T2
May 7, 2013

Math
anyone can explain?
May 5, 2013

Math
Why the possible sets are 2^5?
May 5, 2013

Geometry
Explain, please?
May 5, 2013

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...
April 30, 2013

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 :/
April 29, 2013

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!
April 29, 2013

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.
April 23, 2013

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?
April 22, 2013

organic chemisty
acid based reaction takes place.
April 21, 2013

World History
Thank you :)
April 20, 2013

World History
Sorry, I meant the decade of 2000-2010
April 20, 2013

World History
What policies affected the citizens during the 21st century? For example: In the U.S. we had the Homeland Security Policy
April 20, 2013

math 4th grade
All you have to do is add 16/24 and 15/24
April 16, 2013

Chemistry
Thanks for your help! Makes lots of sense :)
April 14, 2013

Chemistry
Ah, ok, so another question I have is how would you determine which elements are oxidized and reduced?
April 14, 2013

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...
April 14, 2013

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/...
April 10, 2013

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 ...
April 9, 2013

chemistry
ha :) thanks so much, that helps lots, i don't know why i was over thinking it! you're awesome!
April 8, 2013

chemistry
how do i predict a conjugate a base? Ex: HBr. The conjugate base is Br- a. NH4+ b. H2O c. H2PO4
April 8, 2013

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 ...
April 8, 2013

English
What do stage directions tell the reader? Do they tell about characterization or about the setting?
April 3, 2013

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
April 3, 2013

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.
April 3, 2013

Geometry
What is the surface area and lateral area of a regular triangular pyramid if the slant is 7 and the altitude is 5?
April 1, 2013

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?
March 28, 2013

chemistry
left?
March 27, 2013

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 :)
March 27, 2013

chemistry
that makes sense, thanks for your help
March 25, 2013

chemistry
I think the question was asking for the Cl (aq) ions
March 25, 2013

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 ...
March 25, 2013

Math
30?
March 25, 2013

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
March 25, 2013

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...
March 25, 2013

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
March 25, 2013

chemistry
Thanks so much! :)
March 24, 2013

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
March 24, 2013

Math
determine the equation of a line that passes through (2,1) and is parallel to the line 3x-7y=5
March 23, 2013

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.
March 23, 2013

algebra 2nd try
(2√3:((49)^(2)))/(49)
March 23, 2013

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.
March 23, 2013

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)
March 23, 2013

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.
March 23, 2013

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.
March 23, 2013

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)
March 23, 2013

Math Ms. Sue please
help
March 22, 2013

math check answer
what is true a a trend line data
March 22, 2013

chemistry
why is it necessary to try and keep the temperature constant during an experiment of determining pKa by pH measurements?
March 22, 2013

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
March 22, 2013

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.
March 21, 2013

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...
March 21, 2013

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).
March 21, 2013

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...
March 20, 2013

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...
March 20, 2013

Chemistry
just kidding i figured it out
March 20, 2013

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 ...
March 20, 2013

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.
March 17, 2013

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 ...
March 14, 2013

Math
If you multiply 100!*200!*300!, how many 0s are there?
March 13, 2013

calculus help please!
I know you got 8 from because it is the radius but can you explain why you are using cot?
March 12, 2013

MATH VERY URRRGENT!!!!!!!!!!!!!
one of them was wrong
March 9, 2013

Chem
Thank you so much
March 8, 2013

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....
March 8, 2013

Geometry
110
March 7, 2013

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------&...
March 3, 2013

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 ...
February 27, 2013

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 ...
February 27, 2013

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
February 27, 2013

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...
February 27, 2013

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
February 27, 2013

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 ...
February 27, 2013

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...
February 27, 2013

chemistry
Pleaseeeee helpppp me
February 26, 2013

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 ...
February 26, 2013

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??
February 26, 2013

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