# Posts by ben

Total # Posts: 989

**physics**

I think you forgot to include the actual question part...

**Physics**

I whole-heartedly agree!

**Physics**

Two charges, -2.0 micro C and -6.0 micro C, are located at (-0.65 m, 0) and (0.65 m, 0), respectively. There is a point on the x-axis between the two charges where the electric field is zero. Find the location of the point where the electric field is zero.

**chemistry**

Name the following compounds (with absolute configurations) and are they enantiomers, diastereomers or structure isomers or no relation at all? img34.imageshack.us/i/namethese.jpg/ i think they are disteromers and their names are 1] 1S, 2S - (2-bromo - 3,4 - dimethyl pentane) ...

**chemistry**

Write down the reaction between 1-pentyne and 2 molar HBr should it be 2 br or 4 br? img718.imageshack.us/i/triple2.jpg/

**chemistry**

i posted this already but i got the answer for someone elses question. the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)...

**chemistry**

i posted this already but i got the answer for someone elses question. the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)...

**Chemistry**

the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)NaOCH3 pka of CH3OH = 15.6) i know the answer is b but why is it b? is it ...

**AP Chemistry**

There is an unknown amount of unlabelled monoprotic acid in an unknown amount of water titrated with a sample with a solution of NaOH of unknown molarity. After adding 10.0 mL of NaOH, the pH=5.0. The equivalence point is 32.22 mL of NaOH. What is the Ka? I have been looking ...

**calculus**

Determine the values of a and b for the function f (x) = ax^3 + bx^2 + 3x - 2 given that f (2) = 10 and f ′(-1) = 14. Please help, Thanks!

**SQL**

Explain why the following command would create an error, and what changes could be made to fix the error. SELECT V_CODE, SUM(P_QOH) FROM PRODUCT;

**chemistry**

you're right! sorry i guess im just tired from over studying that i saw the wrong letter!

**chemistry**

Degree of unsaturation why is it 5? C20H32CIN do i ignore the second C? because i did 21(2)+2=44 44-32+1-1 / 2 = 6 but i get it right with 20(2)+2=42 42-32-1+1 / 2 = 5 do i always ignore extra C's?

**french**

please unscramble this word.. the word is eeienhtocasr

**french**

thanks

**french**

can you unscamble eeienhtocasr

**math**

two thirds of 9 is 6 and one third of 18 is 6 if you draw a gragh of 9 divide it into three sections.each section is a third,two of those sections equal two thirds which is 6.now a graph of 18 divided into 3 sections each section is 6.each section represents one third. 6 is ...

**chemistry**

Write the major products with the correct regiochemistry and stereochemistry for 1- ethylcyclohexene and the following reagents: a) NBS, H2O, DMSO if someone could atleast direct me to a site or anything that would be great.

**Physics**

In the figure below, two blocks are connected over a pulley. The mass of block A is 12 kg, and the coefficient of kinetic friction between A and the incline is 0.22. Angle θ is 30°. Block A slides down the incline at constant speed. What is the mass of block B?

**calculus**

Consider the graph of y2 = x(4 − x)2 (see figure). Find the volumes of the solids that are generated when the loop of this graph is revolved about each of the following

**chemistry**

Mechanism for the reaction between 3-methyl-2-pentene and HCl. is this right? %img836.imageshack.us/i/questionk%.jpg/% * delete the percentages for the link to work, its the only way i could post a link

**chemistry**

Write down the correct mechanism for the reaction between 3-methyl-2-pentene and HCL?

**Econ**

Consider the following consumption function. C = 200 + .75(DPI), Where C is consumption, autonomous spending is 200, the MPC is .75, and DPI is disposable personal income. Using the Graph below, graph the Consumption Function. C 100 0 = Income On the Graph, label the point ...

**physics**

jkjkjkjkjkjkjkjkjkjkjk

**chemistry**

thanks, but didn't really find the answer to my question...

**chemistry**

Im doing my lab report about steam distillation? and its asking me how i can tell if the two compounds i steam distilled are pure. but im not sure how to tell? i mean is the volatile or the nonvolatile compound the pure compound? or maybe the boiling point is what tells me if ...

**chemistry**

How can you tell if two compounds that you steam distilled are pure?

**Business**

what are the atributes of tomorrow's leaders according to linda hill?

**Random Question**

thanks alot!

**Random Question**

ok Thanks.

**Random Question**

Does anyone know of any jobs hiring now???

**Algebra 1**

How do you solve this algebraic equation using graphing? y = 3x - 1 y = -x + 1

**Magnetism**

Great, thanks a lot!

**Magnetism**

This is a circular coil and indeed the open area is 227 cm No not perpendicular but parallel from the coil (measured 30 cm away from above the coil). My Gauss meter is not sensitive enough to pick up the signal at this distance. Can you somewhat elaborate more on the various ...

**Magnetism**

I need to calculate the magnetic field strength at 30 cm distance of a coil with a diameter of 17 cm. Directly at the coil surface I measure 100 Gauss. Please advise.

**math**

Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 6-inch side. A = sq. in.

**Chemistry**

How to know overall charge of molecule? see question # 12 here, why is it -1? how do you know? itech.pjc.edu/tgrow/2210/chm2210ps4sol.pdf

**chemistry**

Any easy way to remember the names and structures of functional groups? lol a lot to ask i know.?

**math**

Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 9-inch perimeter A = sq. in.

**Physics**

A toy car coasts uphill at 2.34 m/s. It accelerates at -.34 m/s squared. How long will it take the car to stop.What equation would I use.

**CHEM**

Ok, thank you.

**CHEM**

Are these cations, how do i know? BF3, BH3, AlCl3, FeCl3 how do i recognize a cation?

**chemistry**

can fractional distillation be used to determine purity of a compound?

**chemistry**

Calculate the formal charge on each non-hydrogen atom in eachof the following molecules (show your work) i know the answer but can someone tell me how to get to the answer? 1) H2C=N=N(2 dots on top and on side) 2. H2C-N(3 bonds)C(2dots)

**chemistry**

Calculate the formla charge on each non-hydrogen atom in eachof the following molecules (show your work)

**chemistry**

hey

**chemistry**

okay, that helps a lot thanks!

**chemistry**

im not sure how to answer the questions.

**chemistry**

discuss if and when melting points can be used to determine the purity of organic and inorganic compounds and if and when melting points can be used to identify organic and inorganic compounds.

**4th grade**

8 and 3/4

**chem class**

Our teacher told us we had to do problems on our final on Delta G and S...? all he said is we'd have to plug in numbers from a list and solve. but im very confused. but the numbers he gave in the example are different from my book, is there soemthing we have to do to the ...

**chemistry**

Based on molecular mass and boiling point of the five compounds in the table below, which should have the high? est dipole moment: first # molecular mass 2nd: boiling point compound 1 244 203 compound 2 346 255 compound 3 250 138 compound 4 246 146 compound 5 241 100 i know ...

**chemistry**

How do you know when something has greater/smaller capacity? do you add them and the smallest one is for greater, and the biggest number is for smallest capacity? Which of the following solutions has the smallest buffering capacity? a. 0.821M HF and 0.217M NaF b. 0.821M HF and...

**Physics**

While traveling to school at 27 m/s your car runs out of gas 15 hm from the nearest gas station. If the station is 16m above your current elevation, how fast will the car be going when it reaches the gas station? Ignore friction.

**Statistics**

True or False In Regression Analysis if the variance of the error term is constant, we call it the Homoscedasticity property.

**chemistry**

In HPLC which column comes out first, if it is going forward or reverse? its a question on my final, please help?

**chemistry**

How to know if in TLC and HPLC if it is going forward or reverse?

**physics**

An aluminum wire of radius 3.10 10-4 m is stretched between the ends of 2 concrete blocks. When the system (wire and concrete) is at 35°C, the tension in the wire is 57.0 N. What is the tension in the wire when the system is heated to 185°C?

**EDU**

I have a 250 word elucidation of your collage that described all of the stakeholders and their primary roles

**chemistry**

The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is i solved it but my answer is wrong. the right one is 1.97. am i missing a step? moles of HCl left over = (moles of HCl) – ( moles of KOH) moles of HCl left over = (0.009425 mol) –...

**chem class**

What is the concentration (in M) of hydroxide ions in a solution at 25°C with pH = 4.282?

**chemistry**

The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is ?.

**environment chem**

how many moles of ozone does the atmosphere hold?

**Chemistry**

how many moles of ozone does the atmosphere hold?

**Statistics**

Let p1 represent the population proportion of U.S. Senate and Congress (House of Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2 represent the population proportion of U.S. Senate and Congress (House of Representative) ...

**Statistics**

Let p1 represent the population proportion of U.S. Senate and Congress (House of Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2 represent the population proportion of U.S. Senate and Congress (House of Representative) ...

**chemistry**

The rate law of the overall reaction. A + B -> C is rate = k[ A ]^2 Which of the following not increase the rate of a chemical reaction? a) increasing the temperature of the reaction b)increasing the concentration of reaction A c)adding a catalyst for the reaction d)...

**chemistry**

A possible mechanism for the overall reaction Br2 (g) + 2NO (g) -> 2NOBr (g) is NO (g) +Br2 (g) (equilibrium arrows: on top it says k1 and on bottom k-1) NOBr2 (g) (fast) step 1 NOBr2 (g) + NO (g) ->(on top of arrow k2) 2NOBr (slow) step 2 the question: which of the ...

**math**

if you drive 117 miles in 2 1/4 hours, what is your average speed?

**HELPPPPP**

Find initial momentum for the smaller object, via p1 = mv. Think of this momentum as being in the x-direction. Now break up the other objects momentum into its x and y components, p2x = mvcos(theta) and p2y = mvsin(theta). Final momentum in x-direction = p1+p2x and final ...

**math**

BLIND BATS AT HALLOWEEN There were number of bats in a cave. Two bats can see out of right eye, Three bats can see out of left eye, Four can't see out of left eye, and Five can't see out of right eye. What is the least number of bats in the cave & what might their ...

**chemistry**

Why did i get this question wrong? its about a u shaped tube with a simepermeable membrane 0.3 M Fe (NO3)2 <~ U ~> 0.5 M sugar 0.1 M NaCl So I did this: 0.3 x3 = 0.9 0.5x1=0.5 0.1x2=0.2 = 0.7 so i chose the answer increase in the water level to the left side of the tube...

**chemistry**

The question below, i was wondering if it decrease because the N2 is on the right and so to add to left it would be too much so it gets rid of it by decreases and doing to the right? because the left side is (+) endothermic? sorry im a little confused. if the number was ...

**Chem**

How can i determine that the volume is decreasing? Of the following equilibria, only ??? will shift to the left in response to a decrease in volume. A) 2HI <->(g) H2 (g) + I2 (g) B) N2 (g) + 3 H2 (g)<-> 2 NH3 (g) C) 4 Fe (s) + 3 O2 (g)<-> 2 Fe2O3 (s) D) 2 SO3...

**Statistics**

In a poll of 1,004 adults, 93% indicated that restaurants and bars should refuse service to patrons who have had too much to drink. Construct the 90% confidence interval for the proportion of all adults who feel the same way.

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right? to get the original -7.6 answer i used the two...

**chemistry**

to get the original -7.6 answer i used the two lowest two points here and subtracted: x y 3.50E-03 -11.7 3.14E-03 -8.96 3.28E-03 -9.75 (-11.7) - (-8.96) -------------------------- (3.50x10^-3)-(3.14 x10^-3) = -7.6111x10^3

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right?

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right?

**chem help**

im doing a graph for chem lab with excel. my classmate created a graph with these coordinates: X: 3.50 X10^-3 3.14X10^-3 3.28X10^-3 Y: -11.7 -8.96 -9.75 They got R2=0.998 but i got y = -3074.9x R² = 0.6291 why is it wrong. im desperate please help! screen shot of my graph...

**economics**

why might an economist look at hundreds of cars moving along an assembly line and call it an example of scarcity

**chemistry**

is rbi2 an ion?

**chemistry**

Use bond energies to predict the molar enthalpy of combustion of acetylene gas. 2C2H2 + 5O2--> 4CO2 + 2H2O I am confused as to how to do the 2C2H2 in relation to the bonds? how many c-c bonds would there be, or would they be triple bonds?

**chemistry**

Naturally occuring boron is 80.20% boron-11 and 19.80% of some other isotopic form of boron. What must be the atomic mass of this second isotope be in order to account for the 10.81 amu average atomic mass for boron?

**physics! center of mass**

there is no answer

**8th grade**

what do you call someone who cant turn pancakes?

**physics**

A dart gun is fired while being held horizontally at a height of 1.00 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 5.00 m. A college student holds the same gun in a horizontal position while sliding...

**keyboarding**

You're putting together a memo and have additional material to staple to it. What word should you type below the reference initials?

**calculus**

Use the function defined below to calculate the indicated derivative. f(t)= 4/(t^3)+3 what is f''(2) (second derivative) Need help!!

**CHEM**

oops, thanks for the help!

**CHEM**

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. where have i made a mistake? 35g/60=0....

**About Chemistry**

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. im not sure about the steps for ...

**Chemistry**

Calculate the amount of heat required to raise the temperature of a 54 g sample of water from 5°C to 20.°C.

**math**

0.331,0.332,0.333

**Chemistry**

What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H?

**math**

One of the angles of a right triangle measures 30°, and the hypotenuse is 10 inches long. How long is the side opposite the 30° angle?

**geometry**

The side of a triangle opposite a 58° measures 15 inches. To the nearest hundredth of an inch, what is the length of the side opposite a 53° angle

**Calculus**

No. I have no idea how to do this. I did part a and part be right but i cant do this part c

**Calculus**

Compute the average velocity over time intervals [4, 4.01] , [4, 4.001] , [4, 4.0001] , [3.9999, 4] , [3.999, 4] , [3.99, 4] . Use this to estimate the object's instantaneous velocity at t=4 V(4) = ???? ft/ec How do i even approach this problem?

**Calculus**

How do I find the instantaneous ROC at x=1.5