Saturday

October 1, 2016
Total # Posts: 2,324

**chemistry**

Calculate the molarity of a solution that contains 48g of NaCl in 250ml of solution.

*February 7, 2013*

**Organic chemistry**

ok. Thank you so much for your help.

*February 6, 2013*

**Organic chemistry**

Well .4ml of ethyl acetate, But then it tells you to to .4 ml pf ligroin

*February 6, 2013*

**Organic chemistry**

So if ethyl acetate was the solvent, then what was the ligroin used for?

*February 6, 2013*

**Organic chemistry**

A diels-Alder reaction of cyclopentadiene with Maleic Anhydride experiment was conducted in lab. But I was wondering why we added ligroin to the maleic anhydride and ethyl acetate. I know ligroin can be used as a solvent and it is also nonpolar, though ethyl acetate is also a ...

*February 6, 2013*

**math**

input/output 0 0 2 0 6 0 8 0 -3 -6 -4 -8

*February 6, 2013*

**chemistry**

a 0.25 mol sample af neon gas at 18 C and 0.700 atm is heated to 40 C. the new gas pressure is 1.11 atm. what is the change in volumn of the neon gas?

*February 4, 2013*

**english**

Howard likes birds. simile or not simile?

*January 30, 2013*

**ss**

What was the significance of the court case of Plessy vs. Ferguson

*January 29, 2013*

**Math**

f(x)=x+4; f(x^2), (f(x))^2

*January 28, 2013*

**Analytical Chemistry **

The question: The pH of a solution is defined as pH = -log[H3O+]. If the pH of a solution is 3.72(+/- 0.03), what is the [H3O+] and its absolute standard deviation? Answer: How would I carry this out? I know to find the hydronium concentration wouldn't i just take e^3.72? ...

*January 28, 2013*

**6th grade math**

I read 1/5 of a book Monday. plan to read 1/10 everyday after that. how many days will the book be finished?

*January 28, 2013*

**precal**

If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elapse before only 35% of the radioactive substance remains?

*January 22, 2013*

**algebra 1**

3v-4

*January 19, 2013*

**math 209**

find the value of annuity for a 1=$3000, I=0.09, n= 25

*January 15, 2013*

**its urgent math i need the answer fast**

Fist what is a better buy

*January 14, 2013*

**its urgent math i need the answer fast **

Price: 5.49 Unit Rate: 0.04 Price: 1.50 Unit Rate: 0.02 how much would you save in one year?

*January 14, 2013*

**Hard math**

2x^3-x^2-6x __________ 2x^2-7x+6

*January 13, 2013*

**Chemistry**

a)i b)ii c)iv

*January 11, 2013*

**math**

Factor 5(x^2+4)^4 (2x)(x-2)^4+(x^2+4)^5(4)(x-2)^3

*January 10, 2013*

**Chemistry**

Okay. Thanks for your help.

*January 10, 2013*

**Chemistry**

Here is what I came up with, but not sure if it is correct. 2 moles of NaOH = 79.994g NaOH 79.994g/1L * 1L/1000mL * 100mL/1g = 7.9

*January 10, 2013*

**Chemistry**

Okay... Where did you get 10/40? Also, where would the 79.994g of NaOH come in?

*January 10, 2013*

**Chemistry**

I've been working on this problem for hours and cant figure it out. I know it should be simple, but I'm stuck... The question is... Describe how to prepare 1.00L of a 1.0% (w/v) NaOH from a 2.0 M NaOH. *I need to figure out how many ml of the stock solution is needed. ...

*January 10, 2013*

**floral disign**

What is the most effective way for you to locate local growers to supply your design needs?

*January 10, 2013*

**Physics**

You place two charges a distance r apart. Then you double each charge and double the distance between the charges. How does the force between the two charges change? a) The new force is twice as large. b) The new force is half as large. c) The new force is four times as large...

*January 10, 2013*

**Reading**

IN And then there were none by agatha christe which character changed the most and y: in a paragraph? I need to write a 3 paragraph essay on who changed the most in the book, and i don't know who to choose? please help me!

*January 9, 2013*

**Physics**

The New England Merchants Bank Building in Boston is 152 high. On windy days it sways with a frequency of 0.12 , and the acceleration of the top of the building can reach 2.5 of the free-fall acceleration, enough to cause discomfort for occupants. What is the total distance, ...

*January 8, 2013*

**Physics**

A 492g oscillator has a speed of 99.5 cm/s when its displacement is 3.60 cm and 72.5 cm/s when its displacement is 5.10 cm. What is the oscillator's maximum speed? I'm suck with this problem, can someone please go through it with me step by step, please and thanks

*January 8, 2013*

**History**

Among the legislative acts passed during Franklin Roosevelt’s first term as president, which one gave relief to artists, actors, and writers?

*January 7, 2013*

**Chemistry **

A number of antacid tablets contain water-insoluble metal hydroxides such as milk of magnesia, Mg(OH)2. Stomach acid is about 0.10 mol/L HCl(aq). Calculate the number of millimetres of stomach acid that can be neutralized by 500 mg of Mg(OH)2 (s).

*January 6, 2013*

**math**

can you order 2/3 3/4 5/6 from least to greatest

*January 4, 2013*

**english language arts**

first one to answer gets 200 points

*December 30, 2012*

**english language arts**

3. Identify the simple sentence. (1 point) A. In 1970, my mother graduated from Point Pleasant Boro High School. B. The gymnast swung around the bar, and the coach stepped on the mat. C. The tornado bypassed the town, but the townspeople remained in their shelters. D. The ...

*December 30, 2012*

**HCA415**

In your opinion, what two features have had the greatest impact on improving health status and quality of life throughout history? Explain why you selected these features and provide examples to support your opinion. Please give me examples. Thanks.

*December 30, 2012*

**math**

A bacteria population is currently exactly one million and increasing at a linear rate of 15 per second. What will the population be in two weeks?

*December 29, 2012*

**Accounting**

statement that the difference between the opening bank balance ($30,000) and the January statement balance ($75,000) is pure profit.

*December 21, 2012*

**physics**

The force required to stretch a Hooke’s-law spring varies from 0 N to 68.1 N as we stretch the spring by moving one end 16.2 cm from its unstressed position. Find the work done in stretching the spring

*December 20, 2012*

**Physics**

A Knight of the Round Table ﬁres oﬀ a vat of burning pitch from his catapult at 17 m/s, at 29 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s 2 . How long is it in the air? Answer in units of s

*December 19, 2012*

**math i don't get it**

plz help me

*December 18, 2012*

**Math probability**

What is the probability that a randomly drawn 6-cards hand from a standard deck.... B) contains at least four clubs? C) contains at most three clubs?

*December 18, 2012*

**Math ave grade**

a student scores 76,82,83 on the first three test, she has a 92 homework averge. if the final exam is 50% of grade and homework is 10% and the test average (nit including the final) is 40% then what grade should she get on the final exam to get a 87.5 in the class?

*December 16, 2012*

**Algebra**

How do I write 7t+7/-6 divided by 4t+4/15 in lowest terms ?

*December 16, 2012*

**Science**

A spring has a force constant of 50000 N/m. How far must it be stretched for its poten- tial energy to be 22 J? Answer in units of m

*December 14, 2012*

**Math**

If P(x) is a polynomial with P(–6) = –1.12 and P(–5) = 0.6 then which of the following must be true? A. There is a zero for P(x) between x = –6 andx = –5. B. There is a zero for P(x) between x = –1.12 and x = 0.6. C. There is a zero for P(x) ...

*December 14, 2012*

**Mathsa**

4. Graph the inequality: x ≤ –2 (1 point)

*December 13, 2012*

**Mathsa**

that wat i said

*December 13, 2012*

**Mathsa**

sooooooo are u saying c is the wrong answr

*December 13, 2012*

**Mathsa**

4. Graph the inequality: x ≤ –2 (1 point)

*December 13, 2012*

**Mathsa**

what do you mean????

*December 13, 2012*

**Mathsa**

i think the andswer is c am i right steve

*December 13, 2012*

**Mathsa**

Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1)

*December 13, 2012*

**Mathsa**

cn u hepl me on this one 4. Graph the inequality: x ≤ –2 (1 point)

*December 13, 2012*

**Mathsa**

i worked it out and then posted the ? to see if i got it rght

*December 13, 2012*

**Mathsa**

Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1)

*December 13, 2012*

**Math 6 Help!!!**

help me please

*December 11, 2012*

**math**

the name not rod it's james

*December 11, 2012*

**math**

what does the algebraic expression 6/[9+r] mean

*December 11, 2012*

**statics**

A 10kg block rest on top of a 50kg block. A force of 120n is being pushed on the 10kg block at an angle of 45 deg. What is the magnitude of frictional force between the blocks? The cofficient is force is .4

*December 9, 2012*

**college algebra, Please help!!**

find the line with the given properties. Parellel to the line 7x-y= -7; containing rhe point (0,0) plz show work

*December 9, 2012*

**college algebra-plz help**

Yes, my mistake.find the center, radius and graph of circle. then find intercepts 3(x-5)^2+3y^2=12 plz show work

*December 9, 2012*

**college algebra-plz help**

a circle has the equation 3(x-5)^2_3y^2=12. Find the center and radius and graph the circle. find the intercepts, if any. plz show work

*December 9, 2012*

**English cheack answer**

yuytty

*December 7, 2012*

**math**

if sin(x+α)=2cos(x-b) show tan x such that : tan x=(2-tan α)/(1-2 tan α)

*December 5, 2012*

**Chemistry**

Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur.

*December 2, 2012*

**Probability**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...

*December 1, 2012*

**Probability**

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...

*December 1, 2012*

**Math**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...

*December 1, 2012*

**Math **

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...

*December 1, 2012*

**Math**

Volunteers working to raise funds for a new community library sold 1000 raffle tickets at $10 each. Tickets are to be randomly drawn and prizes are awarded as follows: one prize of $1,000, twenty prizes of $50 and one hundred prizes of $20. What is the expected value of this ...

*December 1, 2012*

**College Math**

Volunteers working to raise funds for a new community library sold 1000 raffle tickets at $10 each. Tickets are to be randomly drawn and prizes are awarded as follows: one prize of $1,000, twenty prizes of $50 and one hundred prizes of $20. What is the expected value of this ...

*December 1, 2012*

**Statistics**

2.376

*November 30, 2012*

**healthcare commumication**

What are the advantages and disadvantages of using traditional, electronic, and social media for health care communication What are the effects of HIPAA and other regulations on the use of these media for health care communication

*November 30, 2012*

**Chemistry**

The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g of ice.

*November 28, 2012*

**Calculus**

Find an antiderivative of q(t)=(t+8)^5

*November 27, 2012*

**finance**

The Ault Company made a credit sale of $15,000. The invoice was sent today with the terms, 3/15 net 60. This customer normally pays at the net date. If your opportunity cost of funds is 9% the expected payment is worth how much today?

*November 27, 2012*

**physics**

A model airplane of mass 1.5 kg is attached to a horizontal string and ﬂies in a horizontal circle of radius 5.8 m, making 2 revolutions every 8 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The ...

*November 25, 2012*

**physics**

An athlete swings a 3.06 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.82 m at an angular speed of 0.25 rev/s. What is the tangential speed of the ball? Answer in units of m/s

*November 25, 2012*

**Math**

What is the truth table for p v ( q arrow going straight across p )

*November 21, 2012*

**Calculus**

Find the area between y=e^-x and y=4(x-x^2.

*November 20, 2012*

**Physical Sci**

John used a force of 300 N to push his younger brother in a wagon for 50m. How much work did John do?

*November 16, 2012*

**statistics**

fhj

*November 15, 2012*

**Chemisty 20**

A sample of water was known to contain chloride ions. To determine the concentration of chloride ions in the water sample, a student added a solution of silver nitrate to 500mL of the water. 1.26g of silver chloride percipitate formed. What was the concentration of chloride ...

*November 14, 2012*

**Calculus**

The velocity of a particle moving along the x-axis is given by f(t)=6-2t cm/sec. Use a graph of f(t)to find the exact change in position of the particle from time t=0 to t=4 seconds.

*November 14, 2012*

**physics**

an object accelerates at 0.8m/s2 when a resultant force of 200n is acting on it what is the mass of the object

*November 13, 2012*

**Calculus**

Find an equation of the tangent line to the curve for the given value of t. x=t^2-2t, y=t^2+2t when t=1

*November 13, 2012*

**physics RC**

wow thank you! book was fairly vague on this subject

*November 10, 2012*

**physics RC**

The potential difference between the plates of a leaky capacitor, C = 3.00 microfarads., drops from 6.80 V. to 3.40 V. in 1.00 s. What is the equivalent resistance (in ohms) between the capacitor plates?

*November 10, 2012*

**math**

what is 11/15 - 7/20

*November 8, 2012*

**English**

i farted so good its not even funny... i think i cause an earthquake

*November 7, 2012*

**fractions from least to greatest**

8/7,5/7,3/7,1,7,4/7

*November 7, 2012*

**Calc 2**

Can someone help me with this one?

*November 5, 2012*

**Calc 2**

Is the series convergent or divergent? n=1 series to infinity (-1)^n * (sqrt(n)/(4+5sqrt(n)) Does this diverge?

*November 5, 2012*

**Calc 2**

Does 3/4 - 3/5 + 3/6 - 3/7 + 3/8.... Converge or Diverge?

*November 5, 2012*

**Calculus 2**

i know that the ratio test is used to figure it out. you first find the limits right?

*November 5, 2012*

**Calculus 2**

Find the radius of convergence and interval of convergence of the series. n=2 series to infinity (-1)^n * x^n+6/n+7 R= ? I= (or[ , ]or) How do i do this?? ( means convergent and [ means divergent.

*November 5, 2012*

**Math**

A frictionless spring with a 7-kg mass can be held stretched 1 meters beyond its natural length by a force of 20 newtons. If the spring begins at its spring-mass equilibrium position, but a push gives it an initial velocity of 0.5 m/sec, find the position of the mass after ...

*November 4, 2012*

**Calc 2**

This is how it looks: hopefully this clarifies it a bit. n^n/(4)^1+3*n

*November 3, 2012*

**Calc 2**

How would I do this one? n=1 to infinity n^n/4^1+3*n Does it absolutely converge, conditionally converge, or diverge? What would I do here?

*November 3, 2012*