Thursday
January 29, 2015

Posts by DANIEL


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

Math
48
August 27, 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. ln⁡x=1+ln⁡(x+1)
July 14, 2014

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

algebra
10
June 15, 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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