Friday
February 12, 2016

# Posts by jessica

Total # Posts: 3,006

Chem
Cu specific heat: 0.385 H2o specific heat: 4.184 21+273.15=294.15 110+273.15=383.15 {I subtracted these and got} ______ 89 250x0.385(383.15-294.15)= 8566.25 450x4.184(383.15-294.15)= 167569.2 47(110-21)=4183 I'm lost on this problem
July 21, 2015

Chem
It's Jessica from my first screen name On this problem I wanted to know if I'm going with the correct formula q= CpxmassxTf-Ti 250 g being mass I just do t know how to set up the formula
July 21, 2015

Chem
When a piece of Copper weighing 250 grams is placed in a cup with 450 ml of water at 21OC and the Cp of the cup is 47 J/K, how many grams of gasoline would it take to heat the system to 110OC?
July 21, 2015

Chemistry II
CpxmassxTf-Ti (2.06)(275)(0-(-25))=14162.5 333J/100x14162.5 = 47161.125 47161.125+14162.5= 61323.625 61323.625(1gas/48,000)= answer: 1.277g of steam Thank you to the way for helping chemistry isn't my best subject so I apreciate the time y'all put in to help tutor
July 21, 2015

Chemistry
T1= 27+273.15=300.15K T2=90+273.15=363.15 K In(1/300.15)-(2/363.15)= 5.709???? Did I get it?
July 21, 2015

Chem
K=0.693/24 = .028875 In(.100/.33)/-.028875= 41.34 sec
July 21, 2015

Chem
-0.693/ In(.100/.33) = 17.23 seconds I know I did my math off but I'm not sure if I did it correct this time would it be 17.23 sec
July 21, 2015

Chem
0.693/In(.100/.33)= -.5804
July 21, 2015

Chem
If compound X has a first-order half-life of 24 seconds, how long would you have to wait for only 33% of the original material to be left? Explain why not knowing original Molarity of X does not effect this problem.
July 21, 2015

francais (french)
I just need to know if im right or not, and the right answers.. about the accents i know them i just cant type them here.
July 20, 2015

francais (french)
And about the "pour" and "de" this is how the sentence was given by my teacher.. so i cant change them i dont think..
July 20, 2015

francais (french)
My answers 1. desquelles 2. auquel 3. desquels 4. auxquelles 5. a laquelle
July 20, 2015

francais (french)
Remplissez les tirets avec la bonne forme de "lequel" If my answers are correct 1. Margo revait de sa soeur pour___ il avait de l'admiration 2. Voila une solution_____ je n'ai jamais pense(a) 3. Tout le monde admirait celle fille ______ on citait des poemes ...
July 20, 2015

media
Can the source language of the film have an impact on its diffusion and its distribution?
July 17, 2015

Calculus
My question is finding the derivitive of y=((x+λ)^4)/(x^4+λ^4). I distributed the exponent in the numerator, but I don't know if that's right. Rewritten as y=(x^4+λ^4)/(x^4+λ^4). I found the derivitive and multiplied accordingly, as ((4x^3+4λ^3...
July 15, 2015

Calculus
So, I have a homework question on The Quotient Rule (taking derivitives) and I would like to know if I did it right. Calculate: y=(1/sqrt(x))-(1/(5th root of x^3). My 1st step was to change the sqrt to x^1/2, and the 5th root to x^1/5+^3. So then I got y=(1/x^1/2)-(1/x^16/5). ...
July 15, 2015

College Algebra
Marcus bought y movie posters for \$3 each. Write an algebraic expression for total amount Marcus spent
July 13, 2015

Language
Click on the line with an error. We have already eaten lunch. Just between you and I, what did you think about the food? No error
July 11, 2015

physics
A 0.700 kg object is swung in a circular path and in a vertical plane on a 0.550 m length string. If the angular velocity at the bottom is 12.00 rad/s, what is the tension in the string when the object is at the bottom of the circle?
July 7, 2015

Algebra
A total of 598 tickets were sold for the school play. They were either adult tickets or student tickets. There were 52 fewer student tickets sold than adult tickets. How many adult tickets were sold?
July 6, 2015

Chem 105
A gas has a volume of 36.0 L and a pressure of 750. torr when the temperature is 10. °C. What is the pressure if the volume changes to 15.0 L and the temperature changes to 78 °C, if the amount of gas stays the same?
July 1, 2015

Psychology
When researchers find similarities in development between very different cultures, what implications might such findings have for the nature-nurture issue?
June 30, 2015

Physics
A motorcyclist who is moving along an x-axis has an acceleration given by a=(6.60-2.29t) for 0 >= t <= 6.0 s, where a is in m/s2 and t is in seconds. At t = 0, the velocity and position of the cyclist are 3.20 m/s and 7.30 m. For the time interval from 0 >= t <= 6....
June 29, 2015

english
June 23, 2015

english
I need a sentence that will finish my descriptive writing off with a funny personification? Aiming for level 7.
June 23, 2015

Math
Solve for x. Express the answer in simplest form. 1/7 = 3 over 4x - 1 1/7 is a fraction
June 6, 2015

Algebra
The height of a triangle is 4 in. greater than twice its base. The area of the triangle is no more than 168 in.2. Which inequality can be used to find the possible lengths, x, of the base of the triangle
June 6, 2015

Math
A spinner has three sections. The table shows the results of spinning the arrow on the spinner 80 times. Section 1 18 Section 2 30 Section 3 32 What is the experimental probability of the arrow stopping over Section 3? A. 1/3 B. 1/32 C. 3/32 D. 2/5
June 6, 2015

Chemistry
The density of pure diamond is 3.5 g/cm^3. The mass of a diamond is 0.25 g.Calculate its volume.
June 2, 2015

informal logic
Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed the test than students ...
June 2, 2015

math
use inductive reasoning to determine the units digit of the number 2^44 the unit digit of 2^44 is_____ powers of 2- 2^1=2 2^2=4 2^3=8 2^4=16 and so on that last one they have is 2^12 so 2^44 would be 1.7592188?
June 2, 2015

mathh
Joanie wants to mail a package that requires \$1.30 in postage. If she has only 5-cent and 7-cent stamps, what is the smallest number of stamps she could use that would be totally exactly \$1.30? the smallest number of stamps is ____.
June 2, 2015

Math
a turtle is at the bottom of a 11 foot well. each day it crawls up 5 feet, but each night it slips back 3 feet. after how many days will the turtle reach the top of the well? the turtle will reach the top of the well after ___ days THANK YOU
June 2, 2015

english
Thank you
May 24, 2015

english
She attributed his shallowness to his luxurious upbringing, in which material comforts like fine clothes and large homes nurtured his sense of privilege. Which of the following is the meaning of "material" as used in the sentence above? A. The substance from which ...
May 24, 2015

english
The store will stay open later during the holiday season. The store will stock a variety of seasonal merchandise. The store will have many discounts available for holiday shoppers. 22. When revising the paragraph above, the writer should address which of the following? A. ...
May 24, 2015

Chemistry
At the start of the process 118 kg of isobutylbenzene is used and the overall yield of the 3 reaction steps is 24%, how many 400 mg tablets of ibuprofen will be produced? Isobutylbenzene: Chemical formula = C10H14 Molecular Weight = 134.22g 2-(4-isobuytlphenyl) propanoic acid ...
May 20, 2015

Chemistry
Choccamine and mintanol have Rf values of 0.81 and 0.21 respectively. What would the distance in centimetres (cm) between the two compounds be if the TLC was run on a TLC plate where the solvent front moved 8.9 cm from the baseline?
May 20, 2015

History
Who did Lincoln command as the first "General of the Union army"
May 18, 2015

Suppose y varies directly with x. Write an equation relating x and y. y = −30 when x = 6
May 17, 2015

English
Would knowledge be considered a theme in Anthem by Ayn Rand?
May 10, 2015

Chemistry
Yes I got 0.996% and rounded. Thanks very much for your help!
May 10, 2015

Chemistry
I understand what you are talking about now because I did not factor in the 94mL. I have added this step in and now got 1.00%
May 10, 2015

Chemistry
May 10, 2015

Chemistry
Okay so this is my process: Mass of Vanillin (C8H8O3) = molar mass x moles 152.15 x 0.017 = 2.59g Mass of Vanillin = 2.59g Mass of Vanilla pods = 24.41g % of vanillin in vanilla pods: (2.59 / 24.41g) x 100 = 10.61% Does this sound right?
May 10, 2015

Chemistry
A 94 mL vanillin solution with a concentration of 0.017 mol L-1 was made by extraction from 24.41 g of vanilla pods. Calculate the percentage of vanillin in the vanilla pods. It would be helpful if you could explain to me the process to work out this question instead of just ...
May 10, 2015

English
We had a chart from A-Z for Anthem by Ayn Rand. For each letter much be at least rhetorical device or a mood or tone. I need help with letters K, Q, W, V, X, Y, Z
May 10, 2015

Chemistry
Consider the reaction: M + 2HCl ¨ MCl2 + H2 When 0.85 mol of the metal, M, reacted with an aqueous HCl solution (the HCl is in excess), the temperature of the solution rose because the reaction produced 6795 J of heat. What is ∆H in kJ per mol of M for this ...
May 4, 2015

English
What are some analogies in Anthem by Ayn Rand from chapters 9-12
May 2, 2015

Pre-Calculus
At 34 degrees north latitude, the longest day of the year has 14.273 hours of daylight, and the shortest day 9.726 hours. If the equinox falls on march 21(day 80), model the hours of the daylight by day?
April 28, 2015

Algebra
1.0<x<1. Which must be true? I. x^9 < x^7 II.x^7+x^5 < x^6+x^4 III. x^7-x^5 < x^6-x^4 2. A football team average x points (the mean) in the first n games, scored y points in the next game, and z points in the one after that . The mean of the n+2 is A.(x+y+z) / (...
April 28, 2015

linear
Suppose that we have a system consisting of two interconnected tanks, each containing a brine solution. Tank A contains x(t) pounds of salt in 200 gallons of brine, and tank B contains y(t) pounds of salt in 300 gallons of brine. The mixture in each tank is kept uniform by ...
April 28, 2015

Hallandale high
^ excuse me bob?!
April 28, 2015

Chemistry
Determine the pH of a solution of 12.00 mL of 0.2 M acetic acid with 10 mL of a 0.025M NaOH? (Ka = 1.8E–5) I've calculated my excess moles of acetic to be .00215. Total volume being .022L. Where do I go from here? Thanks!
April 21, 2015

math
Use Part 1 of the Fundamental Theorem of Calculus to find the derivative of the function. g(x) = e^(3t^2) − 3t dt from 4 to x
April 20, 2015

Physics
i usually go with B if I don't know
April 18, 2015

Chemistry
Okay so in our class we did an ice cream lab where we use Ziploc bags to make ice cream. We made an ice cream mixture and then put it into a smaller Ziploc bag. Then we got a large Ziploc bag and placed ice in it and placed the bag with the ice cream mixture into the large bag...
April 17, 2015

Chemistry
If 0.605 g of magnesium hydroxide reacts with 1.00g of sulfuric acid, what is the mass of magnesium sulfate produced? Mg(OH)2(s)+H2SO4(l)→MgSO4(s)+H2O(l) .605g Mg x 1molMgSO/1molMg=.605g MgSo 1.00g MgSO/1mol H2SO4=1.00g MgSO .605g+1.00g=1.605g This is incorrect, but I ...
April 17, 2015

Strategies for the Independent Learner
April 16, 2015

Strategies for the Independent Learner
When you approach a text, you should A. survey it, using the technique called SQ3R. B. dive right in at the first page and read the assigned section. C. skip over words you don’t know. D. read only the boldface type. 2. The proctored exams for your degree courses are A. ...
April 16, 2015

prentend that it grandma
April 14, 2015

a wolf
April 14, 2015

ela
what does Little Red Riding Hood meet as she walks through the woods? What problem or conflict does this character present?
April 14, 2015

why does little red riding hood go for a walk in the woods?
April 14, 2015

Chemistry
I think that: Phe = remain at origin (1) Asp = migrate towards positive electrode (2) His = migrate towards negative electrode (3) Is this correct?
April 14, 2015

Chemistry
I know that the pI (isoelectric points) for each amino acid are as follows: His = pI 7.64 Asp = pI 2.98 Phe = pI 5.91 So I think that Phe will bear no net charge at 5.91 and will remain at the origin because it is at the pH where it is likely to be attracted to a positive or ...
April 14, 2015

Chemistry
The electrophoresis of a mixture of histidine (His), aspartic acid (Asp) and phenylalanine (Phe) is carried out at a pH of 5.91. Match the amino acid to its predicted behaviour under electrophoresis at that pH. 1. This amino acid will bear no net charge at pH 5.91 and so will ...
April 14, 2015

Chemistry
The electrophoresis of a mixture of histidine (His), aspartic acid (Asp) and phenylalanine (Phe) is carried out a pH of 5.91. What amino acid will This bear no net charge at pH 5.91 and so will remain at the origin, carry a net negative charge at pH 5.91 and so will migrate ...
April 14, 2015

Chemistry
An aqueous solution of a monoprotic acid is prepared. This acid is known to have a pKa of 8.6. If the acid is 37.5% ionized when in solution, what is the pH of the solution? Not really sure where to start with this question? Thanks in advance
April 14, 2015

Math
How do you write a graph to represent the function x=0,1,2,3 y= 1,4,7,10
April 13, 2015

Math
What is the funtion rule shown in the table n 3,4,5,6 y 2,1,0,-1
April 13, 2015

Chemistry
calculate oh- and ph in a solution in which dihydrogen phosphate ion is 0.335 M and hydrogen phosphate is 0.335 M. This is a homework question, where I have the solution, which is 0.335/0.335, which I get, but then I am supposed to multiply this (1)by a number 6.2x10-8? I have...
April 9, 2015

algebra
You are making a fence for your garden. The length is five less that two times the width. A.write a polynomial that represents the perimeter of the garden. B.write a polynomial that represents the area of the garden. C. Find the perimeter and area of the garden when the width ...
April 8, 2015

Health P.2
its not d i answerd d and got it wrong!
March 26, 2015

math.
I get 0.469 but i dont think it is right
March 25, 2015

math.
Kool Klothes has determined that the revenue function for selling x thousand pairs of shorts is R(x) = -5x^2 + 21x. The cost functiom C(x) = 2x + 10 is the cost of producing the shorts. A) How many pairs of shorts must the company sell in order to break even. Do i use the ...
March 25, 2015

How did you get 337.66, i still get 337.59
March 25, 2015

Chemistry
Well I'm in Chemistry that's why I put it under that :/
March 24, 2015

Chemistry
There is a picture of a brick lying face down and one standing straight up. The question asks: Is each brick exerting the same force? Explain. I know that they are exerting the same force, but I don't understand why and how to explain it?
March 24, 2015

Coding
This 23 year old female is brought into the emergency department after being found by her collage roommate. Sometimewithin the last hour and a half after th roommate left, the patient ingested her intire bottle of verapamil (estimated at over 20 pills) as a suicide attempt, ...
March 24, 2015

chemistry
whoever answered that, God bless you.
March 22, 2015

chemistry
Write a balanced chemical equation for the neutralization reaction between aqueous hydrochloric acid and aqueous calcium hydroxide. Be sure the formulas are written correctly before balancing, and include phases. HCl+H2CaO2 im not sure that's written correctly but that is ...
March 22, 2015

Math
42/6=7
March 22, 2015

Chemistry
Figured it out. I didn't know I had to put parentheses around the 1/3 when I was raising it to the 1/3 power. So I input 12.5^(1/3), and then got the correct answer. Thanks!
March 21, 2015

Chemistry
I appreciate the help, but I don't have a y^x button on my calculator, I have a TI-83 Plus. Is there an equivalent button?
March 21, 2015

Chemistry
At 500 degrees celsius, K for the formation of ammonia from nitrogen and hydrogen gases is 1.5x10-5. N2(g)+3H2(g)->/<-2NH3(g) Calculate the equilibrium partial pressure of hydrogen if the equilibrium partial pressures of ammonia and nitrogen are 0.015 atm and 1.2 atm, ...
March 21, 2015

Chemistry- Electrochemistry
Calculate the activity of KI, x, in the following electrochemical cell if the potential is +0.294 V Ag | AgCl(s),NaCl(aq,0.1) ||KI(aq, x),I (s) | Pt
March 20, 2015

math
To solve this equation first what you have to do is isolate the variable and its coefficient(3). So what you have to do is first add 6 to each side of the equation ( remember you have to do the opposite operations.) Then you would be left with 3y=26. Next what you do is divide...
March 17, 2015

Math
Thanks so much! This helped a lot
March 17, 2015

Math
Plane A leaves the airport. One hour later, Plane B leaves the same airport on the same course. It catches up to Plane A in 2.5 hours. The average speed of Plane B is 300km/h faster than Plane A. Find the speed of each plane.
March 17, 2015

Chemistry
A certain reaction has an activation energy 52.93 kJ/mol. At what kelvin temperature will the reaction proceed 8.00 times faster than it did at 315K? Ea = 52.93 kJ/mol = 52930J R (gas constant) = 8.314 T1 = 315K k1 = rate constant at T1 T2 = ? k2 = rate constant at k2 = 8.00 ...
March 17, 2015

math
2*x+y=4.82 0.5x+2y=2.29 Multiply the second equation (0.5x+2y=2.29) by 4 and take away the x. 2*x+8y=9.16 Subtract 2*x+y=4.82 from 3 7*y=4.34 y=4.34/7=0.62k The cost would be 0.62k. Hope that helps! :)
March 17, 2015

calc
At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 30 km/h. How fast is the distance between the ships changing at 4:00 PM?
March 12, 2015

Physical science
Two rectangular blocks are stacked on a table. The upper block has a mass of m2 and the lower mass is m1 > m2. The coefficient of kinetic friction between the lower block and the table is ųk. The coefficient of static friction between the two blocks is ųk. A ...
March 8, 2015

Math
At & T has a cell phone plan of \$25.00 a month plus 30 cents per minute. There is a one year contract wit a new phone for \$19.99 Can someone put this into a equation for me.
March 7, 2015

Chemistry
Light from three different lasers (A, B, and C), each with a different wavelength, was shined onto the same metal surface. Laser A produced no photoelectrons. Lasers C and B both produced photoelectrons, but the photoelectrons produced by laser C had a greater velocity than ...
March 6, 2015

Chemistry
A reaction proceeds with ∆ H = 40 kJ/mol. The energy of activation of the uncatalyzed reaction is 120 kJ/mol, whereas i t is 55 kJ/mol for the catalyzed reaction. How many times faster is the catalyzed reaction than the uncatalyzed reaction at 25°C?
February 27, 2015

BioMechanics
You have a subject (height = 150 cm, mass = 85 kg) lying prone on a moment table with their feet pressed against the foot rest. Assuming that you zeroed the scale before the subject got on the table, the scale now reads 40 kg. Where is the centre of mass (relative to the feet...
February 21, 2015