Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 741

**Eng**

A is wrong because it should be its

**Trigonometry**

wrong man

**MATHS**

explain, please?

**math**

Why?

**chemistry**

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

**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 (wi...

**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 th...

**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.

**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?

**Chemistry**

Thanks for all your help!

**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

**Chemistry**

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

**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

**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....

**math**

What if it is something like 0 = 5?

**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...

**chemistry**

Use the formula (V1*P1) / T1 = (V2*P2)/ T2

**Math**

anyone can explain?

**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...

Pages: <<Prev | 1 | **2** | 3 | 4 | 5 | 6 | 7 | 8 | Next>>