Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 645

**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.

**math**

Hi

**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 it...

**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) republica...

**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) republica...

**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)increas...

**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 foll...

**math**

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

**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 eyes...

**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 negat...

**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?

**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 proble...

**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

**English (E-mail Writing)**

Thanks a ton for the link, I really appreciate it!

**English (E-mail Writing)**

Oh wow, thanks a lot. I guess I was looking for something longer, because her e-mail was a good 6 paragraphs or so. When writing these sorts of e-mails, is there a trick to make it seem more formal and not informal?

**English (E-mail Writing)**

I want to do some research with a professor on campus, but I'm having a lot of trouble composing this e-mail. She sent me a long e-mail with stipulations for joining her lab and at the end it basically says "If you agree to all this, let me know and we'll set up a...

**college math213**

Try putting the parentheses around two numbers and figure out what you get. Don't forget that you do operations in parentheses first. For example: 16-7+5=4 You could do: (16-7)+ 5 = 4 OR 16-(7+5) = 4 Which one would be right?

**Physics**

A machine carries a 4.5 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.60 m) + (12.0 m) + (7.30 m) at t = 11 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N) . ...

**math**

(x^4 - 8x^2 + 15) = (x^2-3)(x^2-5) so there will be a (x^2-3) term in the numerator and denominator that will cancel leaving (x^2-5)

**Pythagorean Theorem**

40 cm

**ap chemistry**

yeah sorry

**ap chemistry**

The vitamin niacin can be isolated from lover, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet

**algebra**

if x varies inversely as w, and z=40 when w=.06, fine z when w=20

**american government**

2. In federalism, the national government (Points : 1)

**physics **

Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 3.5 kg and a coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom?

**Computer Science JAVA FUNCTIONS**

Write a Function You will be given one of the following problems to solve using and writing Python functions. Given a list of words, return an array which indicates the frequency that each letter occurs. For example, in the list [”apple”, ”bob”], [ ’a&...

**computer science**

Hey I have three questions with creating these methods can any of you guys write an example code for this? Thanks Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which indicat...

**computer science**

Hey I have three questions with creating these methods, thanks. Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which indicates the frequency that each letter occurs. For exam...

**algebra**

length and width of a rectangle A=198 in width =x length =x+7

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.

**geometry**

the slope of a line that is perpendicular to (2,4) and (-1,0) is

**4th grade**

Hi

**economics**

Suppose velocity is stable, What would the Federal Reserve need to know in order to keep output at its natural level following a supply shock?

**phys101**

The heat-energy needed to produce any temperature change in the liquid is: DeltaH = mass x heat-capacity x DeltaT where DeltaT is the change in temperature. The heat-energy needed to melt the ice is: Hmelting = mass x heat-of-fusion Lets assume the final temperature is 'T&...

**alegbra **

The answers are all coordinates in this format: (x,y) The first equation y=0, means that the answer looks like this: (x,y=0) or (x,0) If y=0, you can replace y in the second equation so you get x=0+2=2 So x=2. Answer: b) (x=2,y=0) or (2,0)

**science**

Describe the bonds that "un-zip" during the replication of dna.

**science**

Describe the bonds that "un-zip" during the replication of dna.

**9th grade English**

you need an apostrophe on "Tybalts" in the last line. Nice job

**8th grade algebra**

exponent of 1000

**american intercontinental university**

The fresh water should taste sweet because of the sugar residue left in your mouth

**Algebra**

2x-6y<18 when I change this to the other form I get y>-2/6+(-3)but when I graph it all the points come out = to instead of > than. What am I doing wrong.

**6th grade Language Arts**

We made a compromise

**chemistry**

Thank you very much for your time.

**chemistry**

Nitroglycerine decomposes according the the equation: 4C3H5(NO3)3 -> 12 CO2 + 10 H2O +6N2 + O2. 15.0 g of nitroglycerine is placed in a 500 ml flask at 25.0 C. The vapor pressure of water at this temperature is 23.8 mmhg. Find the total pressure in the flask after the react...

**physics**

rofl do you go to W-L?

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...

**math algegra**

one type of probablity used practically daily is?

**Math**

how do you solve: 2A^2-7a-15

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