Sunday

February 7, 2016
Total # Posts: 2,417

**Chem**

The experiment is about titration of vinegar with NaOH. Before I start titration, I need to calculate how much of vinegar I will want to be using. I think I might use 50ml of distilled water to mix vinegar and I am gonna drop 3drops of phenolphthalein as indicator. Please help...
*October 10, 2010*

**Chem**

Given that Kw = 2.4x10^-14 at 37 celsius, compute the PH of a neutral aqueous solution at 37 celsius, which is the normal human body temperature. Is PH = 7 solution acidic, basic, neutral at 37 celsius? Thank you!!!!!!
*October 9, 2010*

**chemistry**

Thank you, I was using the wrong one.
*October 8, 2010*

**chemistry**

I have tried using that equation but I keep getting 4.something. My answer should be around 9.
*October 8, 2010*

**chemistry**

do i work this out the same way i do a pH problem with one volume?
*October 8, 2010*

**chemistry**

.70 L of a buffer solution that is 0.120 M in NH3 and 0.450 M in NH4Cl are diluted to 5.80 L with distilled water. What is the pH of the buffer? Kb of NH3 = 1.8 x 10^-5
*October 8, 2010*

**math**

A new software company wants to start selling DVDs with their product. The manager notices that when the price for a DVD is 20 dollars, the company sells 139 units per week. When the price is 34 dollars, the number of DVDs sold decreases to 91 units per week. Answer the ...
*October 8, 2010*

**math**

Fabulous!!! Thank you so much!!! He's having trouble grasping the concept so I didn't want to confuse him!! Thank you thank you thank you!!!!
*October 7, 2010*

**math**

8999 = 9000 8999 = 9000 8999 = 9000 I'm helping my 3rd grader and I'm getting confused!! (sad part is, I do basic math everyday!! LOL) And thank you so much for all your help!
*October 7, 2010*

**math**

round to the nearest thousand, nearest hundred, nearest ten 8999
*October 7, 2010*

**math**

round to the nearest ten 3,490
*October 7, 2010*

**math**

Round to the nearest thousand, nearest hundred, and the nearest ten 7509
*October 7, 2010*

**math**

3y+6y^3-2y^2+5y^3+5y^2-4y+2
*October 7, 2010*

**math**

3y+6y^3-2y^2+5y^3+5y^2-4y+2
*October 7, 2010*

**science**

What are the functions of indicator in acid-base titration?? Thank you!
*October 7, 2010*

**Ohlone**

how many moles of oxygen are consumed in burning 1.6 moles of benzene, C6H6?
*October 7, 2010*

**math 5th grade**

(17-A)SQUARED=2209 SOLVE FOR A
*October 6, 2010*

**physical ed sports**

name the six positions on a volleyball court IN SERVING ORDER(1st-6th)beginning with the first player serve.
*October 6, 2010*

**Bio**

Given an allele frequency of o.91 for a hypothetical red allele (bead), the percentage of blue alleles residing in the heterozygotes would be? a) 89% b) 90% c) 91% d) 92% e)93% i don't even know how to approach this question
*October 6, 2010*

**physics**

Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*October 5, 2010*

**physics**

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?
*October 5, 2010*

**3rd grade**

No couse 71 is a huge jump from 80
*October 4, 2010*

**marketing**

. In your own words describe at least three activities that represents each characteristic of a CRM plan; share of customer, lifetime value of a customer, customer equity or high-value customers.
*October 4, 2010*

**physics**

A 120 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?
*October 4, 2010*

**statistics**

A survey of 40 clothing stores reported these numbers of sales held during a randomly selected year 11-15,16-20,21-25,26-30, 31-35, 36-40 and the frequencies are 3,5,12,9,8,3 Caculate the mean variance and standard deviation
*October 4, 2010*

**statistics**

A survey of 40 clothing stores reported these numbers of sales held during a random,ly selected year
*October 4, 2010*

**science**

What does the () around an element mean, for example Mg(OH)2
*October 3, 2010*

**Chem**

You are titrating an unknown weak acid you hope to identify. Your titrant is a 0.0935 mol/L NaOH solution, and the titration requires 22.3 mL to reach the equivalence point. How many moles of acid were in your sample?
*October 3, 2010*

**Physics Help!**

A force of 36.1 N is required to start a 4.0 -kg box moving across a horizontal concrete floor. If the 36.1 N force continues, the box accelerates at 0.71 m/s^2. What is the coefficient of kinetic friction? I got 0.072 as my answer and this is showing as incorrect. I did: 36.1...
*October 1, 2010*

**physics**

I got 0.072 as my answer and this is showing as in correct. I did: 36.1 - mu x 4.0kg x 9.8 = 4.0kg x 0.71 0.71 / 9.8 = 0.072
*October 1, 2010*

**physics**

A force of 36.1 N is required to start a 4.0 -kg box moving across a horizontal concrete floor. If the 36.1 N force continues, the box accelerates at 0.71 m/s^2. What is the coefficient of kinetic friction?
*October 1, 2010*

**math**

wow thank you now I understand
*September 29, 2010*

**math**

yes, I don't understand how to solve the problem
*September 29, 2010*

**math**

write in order from least to greatest the six numbers whose digits are 2,8,and 9
*September 29, 2010*

**Stats**

Instructions for Data Sets: In each data set, the dependent variable (response) is the first variable. Choose the independent variables (predictors) as you judge appropriate. Use a spreadsheet or a statistical package (e.g., MegaStat or MINITAB) to perform the necessary ...
*September 29, 2010*

**English**

What is the verb, the subject, the predicate nominatives, and direct object in the folling sentence 1.In September of 1739, David Brainerd entered Yale College. 2. Yale was a good school for young preachers. 3. After four months of school, Mr. Brainerd caught the measles. 4. ...
*September 29, 2010*

**Alg. II**

Solve y=Arcsin 1/2 A.) -5pi/6 B.) 5pi/6 C.) -pi/6 D.) pi/6
*September 28, 2010*

**Accounting**

What is the relationship between the amounts on the adjusted trial balance for an account and its ledger? Why is it necessary to prepare the formal financial statements if all the data are on the adjusted trial balance? I am having problems finding the answer to thsee two ...
*September 28, 2010*

**college- Physics**

David is driving a steady 24.0m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70m/s^2 at the instant when David passes. How far does Tina drive before passing David? What is her speed as she passes him?
*September 27, 2010*

**Science- Physics**

David is driving a steady 24.0m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70m/s^2 at the instant when David passes. How far does Tina drive before passing David? What is her speed as she passes him?
*September 27, 2010*

**physics**

A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.6 m/s, how long does it take the boat to make a round trip consisting of a 180 m displacement downstream followed by a ...
*September 27, 2010*

**statistics**

12) The regression equation Credits = 15.4 - .07 Work was fitted from a sample of 21 statistics students. Credits is the number of college credits taken and Work is the number of hours worked per week at an outside job. A) Interpret the slope. B) Is the intercept meaningful? ...
*September 27, 2010*

**Statistics**

12.22 A regression was performed using data on 16 randomly selected charities in 2003. The variables were Y = expenses (millions of dollars) and X = revenue (millions of dollars). (a)Write the fitted regression equation. (b)Construct a 95 percent confidence interval for the ...
*September 26, 2010*

**5th grade English**

Lake Baikal is in southeast Siberia. I have to identify the adjectives. southeast
*September 22, 2010*

**college physics**

A swimmer is heading straight for the other shore of a river with a velocity of vs=0.7 m/s relative to the water, but is carried away by the current, which has a velocity of vr=0.3 m/s. It takes her 20.3 s to get across. How far downstream does she end up? Can someone please ...
*September 22, 2010*

**algebra 1**

arlene house of beauty offer a package of three facial for $48 each. your best friend hear that you plan to purchase the package from arlene and offers todothe work on you herself she wants you to buy any supplies needed and pay her $12 per hour for her time. the supplies you ...
*September 21, 2010*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?
*September 19, 2010*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?
*September 19, 2010*

**chemistry**

What mass of carbon dioxide is produced from the complete combustion of 8.20×10−3 g of methane?
*September 19, 2010*

**Statistics**

The average mpg usage for a 2004 Ford Expedition 2WD for a sample of 10 tanks of gas was 17.0with a standard deviation of 0.8. For a Ford Explorer 2WD, the average mpg usage for a sample of 10 tanks of gas was 18.5 with a standard deviation of 1.0. (a) Assuming equal variances...
*September 19, 2010*

**Statistics**

A survey of 100 mayonnaise purchasers showed that 65 were loyal to one brand. For 100 bath soap purchasers, only 53 were loyal to one brand. a) Perform a two-tailed test comparing the proportion of brand-loyal customers at á=.05.b) Form a confidence interval for the ...
*September 19, 2010*

**math**

sean is buying a player for $315. interest free payment plan. pays $25 each month. a. how much will he owe after 1 payment? 2 payments? 3 payments? b. use n to stand for the number of payments and a for the amount still owed. write an equation for calculating a for any value ...
*September 15, 2010*

**Algebra 2**

I've got some homework about ellipses and I am not sure if I am doing these right. So if you could check my answers I would appreciate it. Thanks!! 1.) Write an equation for an ellipse if the endpoints of the major axis are at (1,6) and (1,-6) and the endpoints of the ...
*September 14, 2010*

**economics**

10. 10. The amount of time an individual is willing to offer for a wage depends on the a) all of the following b) value of time devoted to leisure activities c) boredom, discomfort, and aggravation associated with work d) value of time devoted to nonmarket work e) satisfaction...
*September 14, 2010*

**statistics**

Use Excel to find the p-value for each test statistic.a. Right-tailed test, t = +1.677, n = 13 b. Left-tailed test, t = −2.107, n = 5 c. Two-tailed test,t = −1.865, n = 34
*September 13, 2010*

**statistics**

Find the p-value for each test statistic. a. Right-tailed test, z=+1.34 b. Left-tailed test, z=−2.07 c. Two-tailed test, z=−1.69
*September 13, 2010*

**science**

scientific notation 78,990
*September 12, 2010*

**english**

Using the chicago style manuel, how would you cite this in in-text citation. Smith doesn’t disagree. (In fact, he claims he figured this out himself!) Citation: Smith, 2008, p. 15 There needs to be a citation after the word disagree and at the end after the parenthesis. ...
*September 11, 2010*

**3rd grade**

writing in math mrs. bradner has 30 tomato plants. she wants to plant the same number of plants in each row of her gardner. explain how she could decide the number of rows to plants.
*September 9, 2010*

**calculus**

A point in the first quadrant lies on the parabola y = x^2. Express the coordinates of P as function of the angle of inclination of the line joining P to the origin
*September 8, 2010*

**algebra homework**

1 minus the sqrt of x by the power of 2. I need help with the steps of solving this. I forgot how to do it. Thakns in advance.
*September 5, 2010*

**math**

For the pair of numbers (-1/5),(-1/2) My teacher wants us to find the quadratic equation with integral coefficients that has these numbers as solutions. I am not sure if I have the right equation for this. Could someone let me know if I am right or wrong and then show me how ...
*September 3, 2010*

**math**

Could someone show me how to solve this problem? I am trying to do it myself.I just want to make sure I am going about it the right way. Thank you. z=(SQRTx^2+y^2) (9)^-3/2 (8)^2/3
*September 3, 2010*

**Chemistry **

What mass of pure aluminum can be dissolved by 13mL of 1.6M KOH?
*September 1, 2010*

**algebra**

I need help solving this problem. -6/z+8=-8/3z+24+7. Could some one help me out with this.
*September 1, 2010*

**algebra**

I just want to see if my answer for this problem is correct or not. The aswer I have is 3x^2-3/7x^3-3x^2-17x+6. I was just wondering.Can I factor my answer? 3x-3/7x-3*x+1/x^2-1
*August 31, 2010*

**science**

most of mali is arid. what kind of vegetation would you find there?
*August 31, 2010*

**english/Comm**

I need help in writing 5 sentences about the role of education in successful finacial planning and I need to use a verb tense in each sentence?
*August 28, 2010*

**algebra**

I am having trouble solving this complex fraction. Can you adise me hoe to work it out? The denominator I am using is 4. Is that right? 1/x - 3/2 ---------- 3/4 + 1/x
*August 27, 2010*

**statistic**

A lottery ticket has a grand prize of $28 million. The probability of winning the grand prize is .000000023. Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Show your calculations and reasoning clearly.
*August 27, 2010*

**Statistic**

6.16 Calculate each binomial probability: a. X = 2, n = 8, ð = .10 b. X = 1, n = 10, ð = .40 c. X = 3, n = 12, ð = .70 d. X = 5, n = 9, ð = .90
*August 27, 2010*

**Statistic**

6.18 Calculate each binomial probability: a. Fewer than 4 successes in 12 trials with a 10 percent chance of success. b. At least 3 successes in 7 trials with a 40 percent chance of success. c. At most 9 successes in 14 trials with a 60 percent chance of success. d. More than ...
*August 27, 2010*

**social studies**

Compass rose
*August 25, 2010*

**cell biology**

draw the structure 1-palmitoyl-2-sn-glycero-3-phosphoinositol.using the drawing, illustrate the difference between saturated and unsaturated fatty acids 16:0 and 18:1, n-9
*August 3, 2010*

**general chemistry**

For a molecule with the formula AB2 the molecular shape is
*July 29, 2010*

**English**

Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence
*July 22, 2010*

**math**

8x-(4x+4)=28 x=?
*July 20, 2010*

**algebra**

wow, forgot the term, sorry. 8x-(4x+4)=28
*July 20, 2010*

**algebra**

solve 8x(4x+4)=28 x=?
*July 20, 2010*

**Chemistry**

A scuba diver 60 ft below the ocean surface inhales 50.0 mL of compressed air from a scuba tank at a pressure of 3.00 atm and a temperature of 8.0 oC. What is the final pressure of air, in atmospheres, in the lungs, when the gas expands to 150.0 mL at a body temperature of 37 ...
*July 19, 2010*

**math**

What is a function, in your own words?
*July 15, 2010*

**AP Chemistry 2**

which combination of electronic geometries: I. linear II. trigonal planar III. tetrahedral IV. trigonal bypyramidal V. octahedral include all of the molecular geometries with pyramidal structures? Options: 1. II, III, IV, and V. 2. III and IV 3. III, IV, and V. 4. IV. 5. IV and V
*July 14, 2010*

**AP Chemistry**

what is the molecular shape of OCCl2 ion? C is the central atom. Options: 1. seesaw 2. tetrahedral 3. trigonal pyramidal 4. trigonal planar 5. trigonal bypyramidal 6. octahedral
*July 14, 2010*

**pharmacy math**

the iv dose of mannitol is 1.5g/kg, administered as 15% solution. how many mls of the solution should be administered to a 150 pound patient.
*July 12, 2010*

**Recombinant DNA**

When you digest Vibrio DNA with Sal1, wh do you get mostly large DNA fragments?
*July 11, 2010*

**algebra**

solve 2x > 10
*July 8, 2010*

**math**

if an iv dose of mannitol is 1.5g/kg,administrated as 15% solution.how many mls of the solution should be administered to 150 pound patient
*June 25, 2010*

**math**

Perform the addition on the 12-hour clock. 5 + 11 (Points : 1)
*June 24, 2010*

**business**

can you give me a business scenario
*June 22, 2010*

**chemistry**

True or False CH4 probably has a lower boiling point than SnH4
*June 21, 2010*

**chemistry**

How much heat would be relaesed by the condensation of 5.40g of steam at 100 (degrees)C and the subsequent cooling of the water to 25(degrees)C? [(delta)Hvap=40.7 KJ/mol at 100(degrees)C; Cp for H2O(l) is 4.18Jg-1 (degrees)c-1] A) 12.2 kj B) 18.3 kj C) 12.8 kj D) 13.9 kj E) 23...
*June 21, 2010*

**chemistry**

Ethyl alcohol (CH3CH2OH) has a heat of fusion of 5.01 kj/mol. How much heat in kj is required to melt 137g of ethyl alcohol.
*June 21, 2010*

**Economic **

also i picked United States as the best place to raise a child but i need help starting the intro
*June 20, 2010*

**Economic **

Describing which country you would rank as the best place to raise a child. Be sure to include comparisons such as Literacy rates, infant mortality rates, and at least 5 metrics of the country that you feel might be important to your child. ***what do you about metrics?****
*June 20, 2010*

**Economics**

which country would rank as the best place to raise a child. Be sure to include comparisons such as Literacy rates, infant mortality rates, and any other comparison of a country that you feel might be important to your child.
*June 19, 2010*

**algebra**

Simplify i^-10 How exactly do I solve for this?
*June 17, 2010*

**business**

I'm tring to get on the right page of doing a business model for walmart tring to find the organization,commerce and occupation
*June 17, 2010*

**chemistry**

how many grams of CO2 are produced if 25.0 g of C6H6(BENZENE) was burned?
*June 16, 2010*