Friday

August 1, 2014

August 1, 2014

Total # Posts: 475

**Orgo - recrytalization**

180mg of crude benzoic acid was recrystallized in an appropriate solvent, with a percent recovery of 67%. How much benzoic acid was recovered?

**italian**

ok thanks anyway !!

**italian**

i dont want it from internet but self made

**italian**

i need an essay in italian about the shopping mania.please help me

**Spanish**

Thank you

**Spanish**

Is this correct how I answered these two questions? Donde vive presidente de los Estados Unidos? My answer: El presidente vive en Washington, D.C. De donde es tu amigo? Answer: El amigo es de Colombia. I know I didn't use accent marks-I will put those in, just wanted to ma...

**math **

I can't find the definition and a picture example of distance-time-rate of speed. Help!

**english**

Make a list of expressions that are followed by the '-ing' form

**Math - Rational Roots**

1.) What are the possible rational roots of the function f(x) = 3x^4 - x - 2 2.) What are the rational roots of the following equation: x^3 - 4x^2 - 4x +16 = 0 Thank you for any help!

**physics**

What equation should I used for a water bottle rocket lab? I am using distance vs volume of water. Of course, the volume of water is my independent variable. What equation should I use for this lab?

**Child Psychology**

guidance counselor

**ALGEBRA**

well, it also has a graph with a landscape layout but it will not past into this is there another way i can submit it for help? I am looking for someone to help with a few assignments

**ALGEBRA**

Landscape Design Landscape designers often use coordinate geometry and algebra as they help their clients. In many regions, landscape design is a growing field. With the increasing popularity of do-it-yourself television shows, many homeowners are becoming amateur landscape ar...

**prealgebra**

THANK YOU!!!

**prealgebra**

the value, v, of a shopkeepers inventory software program is given by v= -(1)/(2)t+5 where t is the number of years since the shopkeeper bought the program. What is the program worth 4 years after its first year purchased? Plot the point with the given t-value, 4

**Math - Calculus**

What is the domain of this function?: y= ln(2x-12)

**Math - Calculus**

Which of the following expressions are identical? a. (sinx)^-1 b. arcsinx c. sin x^-1 d. 1/sinx

**Math - Calculus**

I have to solve for x in this problem: (3x+5)/[(x-1)(x4+7)=0

**english**

No, it's an adverb because it is modifying the adjective please. :)

**physic**

I find it easier to view this from a mathematical standpoint: electric potential = electrical PE/ charge If the charge is 0, you have electric potential = electrical PE/ 0 you cannot have a zero in the denominator.

**kindergarten**

Use hook on phonetics Its a combination of objects and sound

**accounting**

How formulate your transcations on a general journal then post it to a general ledger

**chemistry**

How much energy would be needed to vaporize 150 grams of ethanol when it is at its boiling point? Hear of Vaporization (kj/kg)...841.00

**Calculus**

A 10 foot ladder leans against a 20 foot wall. Someone begins pushing the base of the ladder toward the wall at the rate of one foot per second. How quickly is the top of the ladder moving up the wall after 2 seconds?

**Geometry**

I need to find surface area of triangular prism-dimension of base is 9.9 by 6.2 distance between bases is 14.6 choices are: 436.278 466.97 332.94 253.46 Thank you

**Chemistry**

I'll let you know-thank you

**Chemistry**

Hi, this is a reply to the question I asked earlier. I asked about the classification and functional group of an organic compound. It has bonds between H-C-C-H. Off of each Carbon is single bonds of Hydrogen above and below. making a total of 6 Hydrogens and two carbons. They ...

**Chemistry**

No, I looked at the diagram again-this is what is baffling me-the diagram looks as if it is ethane and I also figured it couldn't be any of those functional groups- but that is all that is given. Ethane is an alkane, correct? So for the classification of ethane, would that...

**Chemistry**

Help please! I need to identify an organic compound and tell the functional group of the molecule- the compound is single-bonded ,it is composed of a middle chain H,C,C,H. Off both carbons are single chains consisting of a H above and below each of the carbon. What classificat...

**Chemistry**

When HCl(aq) is exactly neutralized by NaOH(aq), the hydrogen ion concentration in the resulting mixture is a. always equal than the concentration of the hydroxide ions b.sometimes greater and sometimes less than the concentration of the hydroxide ion c. always greater than th...

**chemistry**

hi kelley =]

**chemistry**

How many moles of SO2 are required to make 125 mol CS2 How many moles of carbon monoxide form at the same time that 0.255 mol CS2 forms? THANK YOU

**Accounting**

At October 31, Nathan Company made an accrued expense adjusting entry of $1,400 for salaries. Prepare the reversing entry on November 1, and indicate the balances in Salaries Payable and Salaries Expense after posting the reversing entry.

**4th grade**

to subtract two decimals, line them up using the ?

**Science**

Knowing about covection currents, how do heaters warm the whole house?

**chemistry**

Use Boyle's Law (P1V1=P2V2) 3.0atm*24L=P2*16 )3.0atm*24)/16=P2 After calculating, the pressure ends up being 4.5atm (:

**5th grade**

You should first convert 1.4t into kg. Then from that number subscribe empty trailer's mass and you will get the answer

**com 150**

checkpoint week 6 com 150 my topic is Understanding the Effects of Domestic Violence

**Physics**

Recall that for a finite rod of length L and total charge Q, the electric field for a point located a perpendicular distance r from the middle of the rod has a magnitude given by: Consider the limit of large distances, where a finite charged rod is observed at a distance that ...

**english/analogies**

fifteen:five::nine:

**Microeconomics**

If the equilibrium price of silver is 4 dollars an ounce, under conditions of perfect competition and the industry is in long run equilibrium, will the average total cost of silver be less, equal or exceed 4 dollars?

**math**

sorry i dont get can u explain more clearly pls.

**math**

how do I solve : 1/2 + 2/x =3/4. thanks for helping!

**HCA 240**

Sickle cell anemia

**8grade math**

171 _____ 180

**Math, please check work**

Find the other end point of the line segment with the given endpoint and midpoint. Endpoint; (-4,-4),(midpoint:(7,3)

**math,variables and expressions**

explain how you could show five less than a number using an expression?

**spanish**

what does it mean "usted por que es tan bonita?"

**physics**

The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? I got 2.5 x 10^-21 which is correct. The second question states: Two carbon atoms are joined by a spring-like carbon-carbon bond. The potential energy stored ...

**physics**

c= m to the -1 power

**physics**

m to the -1 power

**physics**

using the work-kinetic energy theorem: .5mvo^2 + Fo/c = .5 mv1^2 where v1 is the velocity at x max I got the following but it is not formatted proprerly. Where am I wrong? .5vo^2 +Fo/c*m = .5v1^2 vo^2 + 2Fo/c*m = v1^2 sqrt (vo^2 + 2Fo/c*m) = v1

**physics**

Second question says two carbon atoms are joined by a spring-like carbon-carbon bond. The potential energy stored in the bond has the value calculated from first question if the bond is stretched 0.050 nm. What is the bond's spring constant? What is the formula for this?

**physics**

Second question says two carbon atoms are joined by a spring-like carbon-carbon bond. The potential energy stored in the bond has the value you calculated from first question if the bond is stretched 0.050 nm. What is the bond's spring constant? What is the formula for this?

**physics**

The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? What is the formula I would need?

**Physics**

A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Is th...

**physics**

A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Is th...

**physics**

How do I calculate the momentum?

**physics**

One glider with a mass 0.2 kg and a speed of 3.5 m/s traveling east collides with another glider with mass 0.5 kg and a speed of 2.0 m/s moving west. They collide and stick together. Calculate the net mechanical energy and is it a loss or gain?

**physics**

Momentum is conserved whenever total mechanical energy is conserved. I believe this is false. Am I correct?

**physics**

Is this true or a trick question? In order to get a piano to start moving, you must push against it with a larger force than it pushes on you?

**physics**

A string is hanging from the rearview mirror of you car and a ball is at the end of this string. Suppose that you drive around a circular track at fixed speed. Which list below gives all the forces that act on the ball? A) tension and the force of gravity b) tension force of g...

**physics**

Is it true or false that when a baseball player hits a home room, the baseball received a greater impulse from the bat than the bat did from the ball?

**physics**

Is it true or false that momentum is conserved when total mechanical energy is conserved?

**physics**

please help--I don't understand how to get started! A small particle of mass 2.0 x 10^-19 kg is attached to a nanofiber of relaxed length 0.50 nm (Recall that 1.0 nm = 10^-9 m) . The nanofiber is attached to a substrate (an immovable wall). The plot is a graph of the force...

**physics**

A 2000 kg space probe is moving rightward in empty space along the x axis at 12 m/s. One of the probe’s rockets is fired providing a thrust of 1800j N along the y axis. The rocket fires for 1.5 s. How can I derive the equation for the trajectory of the probe during the ti...

**physics**

An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero to...

**math**

i need help like for you to show the work so i can figure it out i know how to replace the letters with the fractions but i dont know how to figure it out past there.

**math**

I need help how to figure out 2a-6c when a = -1/3 and c = 3/4

**Math**

Describe a situation where you would use the order of operations with money in your daily life.

**math**

x + y + z when x = -6.059; y= 3.884, z = 15.710 2. -19 -(-2.65)

**Physics**

A ball thrown straight upward returns to its original level in 2.30 . A second ball is thrown at an angle of 38.0 degrees above the horizontal. What is the initial speed of the second ball if it also returns to its original level in 2.30 ?

**Plants**

The closest relatives of the familiar pine and spruce trees are ________. elms, maples, aspens hornworts, liverworts, mosses gnetophytes, cycads, ginkgoes ferns, horsetails, lycophytes, club mosses

**Math**

ohhhhhhhhh I made it harder than it supposed to be....I see how to solve this now thank you

**Math**

1 hr =60mins 60 mins * 4=240mins+30mins = 270mins

**Math**

Multiply and simplify to hours and minutes 4 x (4 h 30 min)=

**college level Macroeconomics**

Here are my answers and i wanted to check if they were correct to the quiz posted below. 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly increas...

**Macroeconomics**

Here are my answers and i wanted to check if they were correct to the quiz posted below. 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly increas...

**Economics**

I was wanting to use answers to check my own, but here are my own answers 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly increases economic gro...

**Economics**

1) The long run growth rate of the economy is consistent with: a.An outward expansion the economy's production possibilities frontier. b.A rightward shift in the aggregate demand curve. c.An inward expansion the economy's production possibilities frontier. d.An increas...

**Trigonometric Functions**

A 2(pi) cm wire is stretched along a circle of radius 4cm. The degree measure of the central angle subtended by this wire arc is what?

**Grade 7**

I am doing a point form biogrpahy on John. A Macdonald. I need some facts about him or some sites where I can find sites about him Thanks:) Julia, CA

**8th grade**

Write a polynomial expression in simplest form that represents the difference between the area of the larger rectangle and the area of the smaller rectangle. Then find the difference when x=4.

**5th grade**

How does the suns energy travel?

**Chem**

It's BeCl2. It has the least difference in electronegativities between the two elements.

**chemistry**

Hey - just look up the Ka (or Kb respectively) values for each compound, and see which is bigger. Stronger acid = bigger Ka and that will dictate which direction it will go in. In this case, H3PO4 is the strongest acid (highest Ka) and therefore the direction of that reaction ...

**Algebra**

There has to be two equations. I got 1,200 for x...

**Algebra**

Chris takes out two loans. He borrows $800 more from a credit union that charges 12% interest than from a bank that charges 15% interest. If his interest payments total $420 annually, how much does he borrow at each rate?

**Algebra 1**

Ms. Buxx invested a total of $2000 in two saving accounts. The first account pays 3% intrest per year. The second accout pays 5% intrest per year. If the intrest form both accounts totals $84 dollars per year how much is invested in each account?

**Correction**

for 2nd question ( shown for Li2S) thnks

**Urgent Chem help.plz**

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide crystal shown? Enter ...

**trigonometry**

2*cos^2(a/2)=(sin^2(a))/(1-cos(a)) can anyone help to prove this identity?

**physics**

Ok, so I know the different kinds of forces (applied, normal, gravity, parellel, and friction). And I know how to sub in other numbers for those forces ( for example, Parallel force is equal to mass times gravity times sine theta). I also know the "base" equation (a=...

**Science**

When an object exerts an action force on a more massive object, how does the reaction force compare to the action force?

**science**

The wind is powerful enough move any object on the surface. Think of it like erosion - it could take away sand and dirt, etc. and change the form permanently

**science**

What are the long term effects of tornadoes?

**Geo**

Identify two responsibilities that you think governments have with respect to population growth. Would that be like the food source, homes education etc???

**Geography**

Which parts of the world are experiencing a very high increase in population?

**Algebra**

I can not figure out how to solve this problem: "Two planes left the Chicago airport at the same time four hours ago. One is 40 miles per hour faster than the other one, and they are 6600 miles apart. What is the rate of each plane?" I am not the best at distance pro...

**physics**

A car is driven 125km west and 65km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

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