Thursday

January 29, 2015

January 29, 2015

Total # Posts: 873

**Chemistry (Electrochemistry)**

Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
*January 21, 2015*

**Chemistry (Acid-Base)**

Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
*January 21, 2015*

**Chemistry**

Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
*January 19, 2015*

**Chemistry**

In water at 25°C, which of the following is the most basic solution? a) pH = 3 b) pH = 0 c) [OH-] = 10-13 M d) [H3O+] = 10-13 M My assumption is is OH- 10^-13, but I am not confident, is this some sort of trick question?
*January 19, 2015*

**physics**

A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 87.0 kg, the mass of the skateboard is 4.10 kg, and the mass of the brick is 2.50 kg. If the person throws the brick forward (in the direction ...
*January 15, 2015*

**physics**

An object is moving so that its kinetic energy is 198 J and the magnitude of its momentum is 13 . 1 kg · m / s. Determine the speed of the object. Answer in units of m / s.
*January 13, 2015*

**Chemistry**

An EDTA solution is standardised against high-purity CaCO3 by dissolving 0.4835 g CaCO3 in HCl, adjusting the pH to 10 with ammoniacal buffer and titrated with an EDTA solution. If 35.18ml were required for the titration, what was the molarity of the EDTA solution? Step 1. ...
*January 11, 2015*

**Chemistry**

Please help, I can't do this and its stressing me out ?!?! A 25.0 mL aliquot of an aqeuous quinine solution was diluted to 50.0mL and was found to have an absorbance of 0.832 at 348nm when measured in 2.00cm cell. A second 25.0mL aliquot was mixed with 10.0ml of a solution...
*January 10, 2015*

**Langague Arts 8th Grade**

i think 8 is character vs character i think 9 is the last one and 10 is hostility. do you have 1 and 2? i need those
*January 4, 2015*

**Calculus**

The function h(x) = x^3+bx+d has a critical point at (2,-4). Determine the constants b and d and find the equation of h(x). I'm very confused and I do not have any idea on what the first step is.
*January 2, 2015*

**Calculus**

The function h(x) = x^3+bx+d has a critical point at (2,-4). Determine the constants b and d and find the equation of h(x). Show your work.
*January 2, 2015*

**physics**

what is retardation
*December 10, 2014*

**math**

help: Two travelers start simultaneously in two cities A and B, and go to meet each other. The part of A walk 1 km on the first day , the second day 2 km , 3 km on the third day , and so on. The part of B walk 20 miles the first day, the second day 18 km , 16 km on the third ...
*December 2, 2014*

**chem due soon**

The ΔH of the reaction below is -575.13 kJ. Is this reaction spontaneous? 2ZnS + 3O2 + C → 2SO2 + 2Zn + CO2 A. It is not because the ΔH of the reaction is negative. B. It is because the ΔH of the reaction is negative. C. It depends on the temperature ...
*December 1, 2014*

**chem due soon**

At temperatures above 0°C, what is the sign of the change in free energy for the conversion of liquid water to ice? A. Positive B. Zero C. Negative D. Not known
*December 1, 2014*

**english**

what are the ideas proposed in “Civil Disobedience.” I need to choose one and make a letter.
*December 1, 2014*

**history**

No, not during the war, after it. With the poor economy women had difficult finding any work outside of home.
*November 29, 2014*

**history**

Postwar America (1918-1920) faced social change. Explain in 3-5 sentences the changes that occurred at this time.
*November 29, 2014*

**physics**

Density of copper= 8960 kg/m^3 " " "" water = 1000 kg/m^3 v= √(T/ρ)= λf λ= 1/f1 √(T1/ρ)= 1/f2 √(T2/ρ) 1 is before submersion and 2 is after f2= f1 √(T2/T1) T2= T1-B B is the buoyant force B= ρ(w)V(w)g (w...
*November 29, 2014*

**spanish don't know which to choose**

spanish cutures
*November 28, 2014*

**spanish don't know which to choose**

A simple route to appreciate other languages and cultures is to explore how your own language and culture have been influenced by other cultures. To help you do this, take a few minutes and discuss in Spanish (1-2 paragraphs) aspects your culture has borrowed from Spanish ...
*November 28, 2014*

**chemistry**

At temperatures above 0°C, what is the sign of the change in free energy for the conversion of liquid water to ice? A. Positive B. Zero C. Negative D. Not known
*November 27, 2014*

**physics**

A proton moves with a velocity V (2i - 4 j + k) m / s in a region where the field is given by B = (i + 2 j -3k) T . What is the magnitude of the magnetic force experienced by the load?
*November 23, 2014*

**physics**

Moving fast proton of 4x106 m / s through a 1.7 T magnetic field experiences a force 8x10-13N magnetic. What is the angle between the velocity vector associated with the proton and the magnetic field?
*November 23, 2014*

**Thermodynamics**

Uh.. sorry for posting the same question, i think i already got the answer, in a previous question. Thany you again.
*November 18, 2014*

**Thermodynamics**

What are the different types of Diffusers?
*November 18, 2014*

**English**

My homework is hard. The question is: COMPARE THE WAYS THE POETS PRESENT STRONG EMOTIONS IN 'MEDUSA' AND ONE OTHER POEM FROM CHARACTER & VOICE. The two poems are Medusa and Les Grand Signeurs. Medusa:Be terrified. It’s you I love, perfect man, Greek God, my own; ...
*November 17, 2014*

**algebra**

maybe a diagram cud be of help, because i cant understand the quest.
*November 17, 2014*

**Thermodynamics**

oh thank you very much for your help, but what i wud like to know, is, can i include these kind of diffusers in a thermodynamics assignment?
*November 17, 2014*

**Thermodynamics**

Hello, Can i know what are the different types of diffusers ? Plz dont tell me to google it, becaus ei already did so, and its not much of great help. Thank you
*November 17, 2014*

**Physics**

A 25 kg box is being pulled across a surface. The coefficient of kinetic friction between the box and the surface is 0.55. a) if the box is moving at a constant speed, what is the pulling force? b)If the pulling force is 350 N, what is the NET force acting on the box? c)If the...
*November 16, 2014*

**math**

3) -3
*November 14, 2014*

**English**

Part (a) – What theme do you think the poet is exploring in this poem? Part (b) – How does the poet use language in this poem to present his ideas? The poem is = FARM CHILD Look at this village boy, his head is stuffed With all the nests he know, his pockets with ...
*November 12, 2014*

**math**

Look at the numbers below. 75, 74, 72, 69, 65 A: describe the pattern
*November 6, 2014*

**Calculus**

Let f(x) = 2x^{3}+9. Find the open intervals on which f is increasing (decreasing). Then determine the x-coordinates of all relative maxima (minima). 1. f is increasing on the intervals: 2. f is decreasing on the intervals: 3. The relative maxima of f occur at x = 4. The ...
*November 4, 2014*

**Reactor Physics**

There is an infinite non-multiplying medium with diffusion length 3 cm and diffusion coefficient 1 cm. There are 3 point sources of neutrons on the x-y plane: „h Source S1 = 108 s-1 at (x, y) = (2 cm, 0) „h Source S2 = 2*108 s-1 at (x, y) = (0, 2 cm) „h Source ...
*November 3, 2014*

**Reactor Physics**

Design the smallest cubical uniform nuclear reactor which will have a fission rate at any point not greater than 2.1*1011 fissions.cm-3.s-1 and a fission power not smaller than 2,500 MW. [Neglect the extrapolation distance.]
*November 3, 2014*

**science (Need FAST FEEDBACK!!!)**

Is a density bottle the same as a pycnometer?
*October 26, 2014*

**physics**

A 2.44 kg object is subjected to three forces that give it an acceleration vector a = -(8.00 m/s2)i hat + (6.00 m/s2)j hat. If two of the three forces are vector F1 = (30.7 N)i hat + (17.0 N)j hat and vector F2 = -(12.0 N)i hat + (8.00 N)j hat, find the third force.
*October 19, 2014*

**physics**

How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?
*October 18, 2014*

**Statistics**

4 people are chosen at random from a group of 15 people. What are the odds that all 4 people chosen were the oldest people in the group?
*October 13, 2014*

**math**

If the area of a rectangle is 2,460 square inches, what are its dimensions?
*September 27, 2014*

**Chemistry**

DrBob222 Please help me here! How do we do charge balance and mass balance? Plz give me an answer on a general basis so that i can do it for any compound i get. Thanks
*September 15, 2014*

**chemistry 1045L**

mass=(convert 2lb ==> grams) radius=(convert 3.5 inches ==>m^3==>L) then replace r in equation, and find volume. Then use density=mass/volume ;)
*September 15, 2014*

**Chemistry**

How do we calculate*
*September 15, 2014*

**Chemistry**

How do we do charge balance and mass balance? Plz give me an answer on a general basis so that i can do it for any compound i get. Thanks
*September 15, 2014*

**Math**

That's part of the question. That's how the question is..
*September 3, 2014*

**Math**

My other number is even. My number is less than 300. Using 2,4,5
*September 3, 2014*

**SCience**

The purpose of surfactant in the lungs is to A. facilitate lung expansion. B. bind oxygen from the air. C. improve lung blood flow. D. remove pollutants in the air. I believe it's A
*July 23, 2014*

**trigonometry**

Find the distance the container is lifted as the winch is rotated through an angle of 5pi/6 radian and a having a radius of 6 in
*July 23, 2014*

**math**

A school has purchased a large field that has a square area of 19,500 ft2. What is the approximate length of each side of the square area? Round your answer to the nearest foot. a. 140 ft c. 142 ft b. 139.64 ft d. 139 ft
*July 17, 2014*

**math**

help please The measures of the sides of a right triangle form an arithmetic progression whose difference is 1. Find the measure of the hypotenuse
*July 14, 2014*

**math**

Help please find three consecutive numbers, which are in arithmetic progression whose sum is 39
*July 14, 2014*

**math**

help please 1. log2 x=1/2 2. log√x=-1 3. lnx=1+ln(x+1)
*July 14, 2014*

**sci**

how is it that kinetic and potential energy involve roller coasters and electricity.
*June 16, 2014*

**HELP MATH 5th grade**

if i answered it D + 6 + (3x4) then i do not need the 5 -- it says which number 3 4 5 6 is not needed
*May 13, 2014*

**HELP MATH 5th grade**

so which number is not needd to solve the problem 3 or 5
*May 13, 2014*

**HELP MATH 5th grade**

The question says the letter d
*May 13, 2014*

**HELP MATH 5th grade **

Sam has 3 pets. Monday she uses d cans of pet food. Tuesday she uses 6 cans Wednesday Thursday and Friday uses 4 cans each day How many cans does she use during thse 5 days? which number is not needed to solve problem? 4 3 5 6 - please explain
*May 13, 2014*

**Math help practice test**

Typo during the 5 days not 3 days
*May 13, 2014*

**Math help practice test **

Harvey has 3 pets. On Monday she uses d cans of pet food. On Tuesday she used 6 cans and wed thurs fri she uses 4 cans each day. How many cans does she use during these 3 days. Which number is not needed to solve this problem. 4 3 5 6 And why?
*May 13, 2014*

**ss**

and my answer is a
*May 2, 2014*

**ss**

the questiion can u check the answer
*May 2, 2014*

**ss**

my answr is A
*May 2, 2014*

**ss**

help i have a question i need help with and can you check my answer 10. most of Venezuela's population lives (1 point)
*May 2, 2014*

**s.s**

i just made a A never mind
*April 30, 2014*

**s.s**

oh now
*April 30, 2014*

**s.s**

mrs sue can you cheak my work please
*April 30, 2014*

**Math**

What mean (m) I don't anderstend.
*April 24, 2014*

**Math**

Jance spend from 7pm to 9pm doing her homework. She spend 3 times as mach time on her english project as she did on math. the science homework took twice as long as her math homework. How meny minutes did she spend on her science homework?
*April 24, 2014*

**physics**

In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?
*March 25, 2014*

**CALCULUS ECONOMICS**

First question: Q=440 and P=660. Second question: s=100
*March 13, 2014*

**physics**

How to calculate the force required to move a 6.12Kg weight up a 10degree friction rig? I have done experiments on the friction rig, adding weight until the sliding weight moved, but the calculated results do not match up. Can anyone help?
*February 22, 2014*

**Statistics**

2. On a certain anxiety questionnaire, the population is known to have a mean of 12 and a standard deviation of 2.3. A higher score represents higher levels of anxiety. Participants in a new relaxation program complete the questionnaire after completing the program, and have a...
*February 19, 2014*

**Statistics**

1. A company decides to add a new program that prepares randomly selected sales personnel to increase their number of sales per month. The mean number of sales per month for the overall population of sales people at this national company is 25 with a standard deviation of 4. ...
*February 19, 2014*

**Algebra**

Solve for x: h=(k/4)(x-3L) Solve for B: v-6Bxk=7B Solve for S: z+(1/7)sk=(1/6)yk^2 Solve for x: 3F=10hx+10hv+10xv
*February 13, 2014*

**algebra & trigonometry**

Thank you Steve.
*February 11, 2014*

**algebra & trigonometry**

The area of a rectangle is 28 square inches. The length is 8 more than thrice the width. Find the length and the width. Thanks
*February 11, 2014*

**algebra & trigonometry**

x(2x+5)=12 2x^2+5x-12=0 (x+4)(2x-3)=0 2x-3=0 2x=3 x=3/2 3/2(2(3/2)+5)=12 3/2(3+5)=12 3/2(8)=12 24/2=12 12=12 width=3/2 length=8
*February 11, 2014*

**algebra & trigonometry**

Is w=-4 the correct answer? thanks
*February 11, 2014*

**algebra & trigonometry**

The area of a rectangle is 12 square inches. The length is 5 more than twice the width. Find the length and the width. Thanks
*February 11, 2014*

**algebra & trigonometry**

Thanks Steve.
*February 11, 2014*

**algebra & trigonometry**

The sum of two numbers is 210. If one number is the square of the other, find the set of numbers. Thanks
*February 11, 2014*

**courtesy**

Thank you Writeacher.
*February 11, 2014*

** courtesy**

How can i thanks someone for their help?
*February 11, 2014*

**algebra and trigonometry**

Thank you Steve
*February 11, 2014*

**algebra and trigonometry**

Thank you Steve.
*February 11, 2014*

**algebra and trigonometry**

At a college function, a total of 180 tickets were sold. The tickets were priced at $5, $10, and $15, and the money collected that day was $1,900. The sum of the numbers of $5 and $15 tickets sold was twice the number of $10 tickets sold. Find the number of each type of ticket...
*February 11, 2014*

**Statistics**

I found the mean but i do not know what the scores are. help. thanks
*February 10, 2014*

**Statistics**

Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...
*February 10, 2014*

**Statistics**

My bad. Thanks.
*February 10, 2014*

**Statistics**

Age at onset of dementia was determined for a sample pf adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...
*February 10, 2014*

**algebra & trigonometry**

Thanks Steve.
*February 9, 2014*

**algebra & trigonometry**

The profit of an organization is calculated by the function P(x) = x2 – 4000x + 7800000, where x is the number of units sold. If the net profit is 3800000, find the number of items sold. Thanks
*February 9, 2014*

**algebra & trigonometry**

At a grocery store, the number of customers arriving per hour is shown by the function f(x) = 2x + 1. Find the number of customers that arrived in the 6th hour. Thanks
*February 9, 2014*

**algebra & trigonometry**

Jerry wants to purchase some items whose cost function is , where x is the number of items. If Jerry spends between $50 and $80, find the minimum and maximum number of items that he can purchase. Thanks
*February 9, 2014*

**algebra & trigonometry**

Jerry wants to purchase some items whose cost function is , where x is the number of items. If Jerry spends between $50 and $80, find the minimum and maximum number of items that he can purchase.
*February 9, 2014*

**algebra & trigonometry**

A person wants to purchase two types of items, A and B, from a shop. She has $200 to spend, and she has to purchase at least 10 items. If the price of one unit of each A and B is $10 and $30, respectively, represent this problem graphically. Thanks
*February 9, 2014*

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