Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 2,123

**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*

**business**

Your friend has asked you why the price of bananas is higher during certain times of the year. Using what you have learned about the laws of supply and demand, explain to your friend how the market affects price.
*June 14, 2010*

**Intro to Finance**

compare and contrast long- and short-term financing. Describe situations in which each type of financing would be used.
*June 12, 2010*

**business**

1. According to the Wolf article, the courts have imposed an "interactive-passive" test of jurisdiction. 2. @ Explain that distinction. According to the Wolf article, is advertising on the web alone enough to confer personal jurisdiction
*June 11, 2010*

**algebra**

ãx + 7 = 2ãx a)(3/7) b) (0) c) (7/3) d) 0
*June 9, 2010*

**algebra**

sqrt() x + 7 = 2sqrt()x a) {3/7} b) {0} c) {7/3} d) 0
*June 9, 2010*

**5th grade**

pressure systems bringing in hurricanes, tornados,and other storms
*June 9, 2010*

**college**

The first difference of a sequence is 6, 10,14,18. The sum of the first two terms of the original sequence is 24. Find the first three term of the original sequence. the first term of the original sequence is?
*June 8, 2010*

**algebra**

Simplify: sqrt() 27 - sqrt() 8 + 2 sqrt() 2 a) 0 b) 3 sqrt () - 2 sqrt() 2 c) 3 sqrt () - 4 sqrt () 2 d) 3 sqrt () 3
*June 8, 2010*

**algebra**

simplify the following radical expression: 3 sqrt () -216x^2/x^2 a) sqrt() -6x b)-6 c)-6 sqrt()x d) 6 sqrt()-x
*June 8, 2010*

**statistics**

that last post, the last number is 120
*June 8, 2010*

**statistics**

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a.Percentage of scores less than 100b.Relative frequency of ...
*June 8, 2010*

**algebra**

What is the approximate value of sqrt()7? a) 1.9 b) 2.2 c) 1.5 d) 2.6
*June 3, 2010*

**algebra**

d^23
*June 3, 2010*

**algebra**

Thank you Jen
*June 3, 2010*

**algebra**

The area of a rectangle is 60 in ^2. The length is 4 inches greater than the width. Find the length. a) 6 in. b) 3 in. c) 4 in. d) 10 in.
*June 3, 2010*

**algebra**

Thank you Ms.Sue :)
*June 3, 2010*

**algebra**

The area of a rectangle is 72 in^2. The width is 6 inches greater than the length. Which expression represents? the width? a) w = 1 * 6 b) w = 1 + 6 c) w = 1 - 6 d) w = 6 - 1
*June 3, 2010*

**algebra**

Thanks
*June 3, 2010*

**algebra**

The area of a rectangle is 144in^2. The length is 4 times greater than the width. Which quadratic equation represents the area of the rectangle? a) w(w - 4) = 144 b) w(w + 4) = 144 c) w(4w) =144 d) w(4 - w) = 144
*June 3, 2010*

**statistics**

Give one example of when practical significance would outweigh statistical significance? Explain your rationale
*June 1, 2010*

**COMM215**

The teacher said they were going to grade the test over the weekend. Is it A. Pronoun shift in number B. Pronoun shift in person C. Ambiguous reference D. No error
*May 27, 2010*

**chemistry**

-log(2.62x10^-1) = 0.58
*May 27, 2010*

**calculus**

Use the first five terms of the exponential series and a calculator to approximate each value to the nearest hundredth. e^3.5 I honestly don't understand the concept or how to solve the problem. :(
*May 26, 2010*

**Chemistry**

Calculate the enthalpy change (delta H) in kJ for the following reaction. 2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy changes for the combustion of aluminum and iron. 2Al(s) + 3/2 O2(g) ==> Al2O3(s) Delta H: -1669.8 kJ 2Fe(s) + 3/2 O2(g) ==> Fe2O3 (s) Delta...
*May 23, 2010*

**Chemistry**

Calculate the enthalpy change (delta H) in kJ for the following reaction. 2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy changes for the combustion of aluminum and iron. 2Al(s) + 3/2 O2(g) ==> Al2O3(s) Delta H: -1669.8 kJ 2Fe(s) + 3/2 O2(g) ==> Fe2O3 (s) Delta...
*May 23, 2010*

**college**

How do i find the slope of the line containing the pair of points (5,4) and (7,-10)slope m= what
*May 23, 2010*

**Chemistry**

When 2 mol of solid magnesium (Mg) combines with 1 mole of oxygen gas (O2), 2 mol of solid magnesium oxide (MgO) is formed and 1204kJ of heat is released. Write the thermochemical equation for this combustion reaction.
*May 19, 2010*

**poetry**

thank you so much :)
*May 19, 2010*

**poetry**

i need help on thinking of a IAMBIC and TROCHAIC poem.
*May 19, 2010*

**English**

correct or incorrect? Sally wants a new bicycle,but her mother and father will not buy her one. My little sister is a big baby;she cries all the time. Mr.Smith,my spanish teacher,is going on vacation. Parents want their children to go to college;however they do not always have...
*May 18, 2010*

**english**

Correct or incorrect? My Garden is full of water,because of yesterday's rain.
*May 18, 2010*

**biology help**

Pick one of the multiple choice that best matches the answer. For grasshoppers and locusts to be in the same family they must also be in the same a. order b. group c. genus d. species
*May 18, 2010*

**poetry**

thank you so much :)
*May 17, 2010*

**poetry**

oh yea sorry i meant troy.
*May 17, 2010*

**poetry**

thank you so much
*May 17, 2010*

**poetry**

I need help to think of 3 more lines to finish this poem. "Dashing trough the streets of Toy, Greeks with swords, and not one coy, Wooden horse was brought within, --------------------------------- --------------------------------- ---------------------------------
*May 17, 2010*

**health**

What are the key anatomical parts of the cardiovascular system and how does it work.
*May 16, 2010*

**reimbursement methodologies**

Robles, I am working on this exam right now. I am having problems with the question - What reimbursement amount will the hospital recive from Medicare? You say it is A. $12,856. What are your calculations? I just can't see how you came up with that amount. If Robles or ...
*May 12, 2010*

**chemistry**

How do you calculate the energy change required to take 45g of water vapor at 126 degrees C to ice at -25degrees C?
*May 12, 2010*

**Algebra**

solve for h. d=1.2 square root h
*May 12, 2010*

**college**

i need math help please. on a math problem
*May 10, 2010*

**college algebra**

4. The yearly cost T, in thousands of dollars, of tuition and required fees at a private college (includes two- and four-year schools and does not include room and board) can be approximated by T= 3/5n + 5 where n is the number of years since 1985. That is, corresponds to 1985...
*May 9, 2010*

**science**

which best describe the desert? a.thick,waxy leaves b.many large leaves. c.a shallow root system.d.a tall,woody stem.
*May 4, 2010*

**4th grade science**

on which of theseb do the phases of the moon have an affect? a. the season b.ocean tides c.day and night d.weather
*May 3, 2010*

**science**

On which of these do the phases of the moon have an affect? a.the season b.ocean tide c.day and night d.weather
*May 3, 2010*

**science**

on which of these do the phases of the moon have an affect? a.the season b.ocean tiders 3.day and night 4.weather
*May 3, 2010*

**chemistry**

Explain why the rate of a simple chemical reaction such as NO(g)+1/2O2(g)=NO2(g) is likey to be most rapid at the beginning of the reaction.
*May 3, 2010*

**Chemistry**

the following questions are about colligative properties: a)How much would the freezing point change in a 2.5 solution of phenol in benzene? b)how much would the boiling point change in a 1.m solution of magnesium chloride in ethanol? c)Does adding sugar to water raise or ...
*May 2, 2010*

**Chemistry**

In each of the following, determine how much solute (in g or mL) must be added to the correct quantity of water to make the given amount of solution at the correct concentration. a)KI to make 50.0mL of a 0.50 M solutioon b)12.0 M HCL to make 500 mL of a 1.0 M HCl c)Sucrose (...
*May 2, 2010*

**physics**

point a is located 0.25 m away from a charge of -2.1 x 10 -9 C. point b is located 0.50 m away from the charge. what is the electric potential difference Vb - Va between these two points?
*May 2, 2010*

**algebra **

A boarding kennel can hold 50 more cats than dogs. It can hold 200 dogs and cats. How many cats can it hold? a) 50 b) 125 c) 150 d) 75
*April 29, 2010*

**algebra**

Sara and her sister Emily both collect charms for the their charm bracelets. Together they have 42 charms. Emily has 2 more charms than Sara. To figure out the number of charms each girl has, you must first identify the conditions. What are the conditions of the problem? a) ...
*April 29, 2010*

**Chemistry**

What is the boiling point of each solution? a).50mol glucose in 1000g H2O b)1.50mol NaCl in 1000g H2O
*April 29, 2010*

**chemistry**

what is the freezing point of a solution of 12.0 g of CCl4 dissolved in 750.0g of benzene? the freezing point of benzene is 5.48 degrees C ; Kf is 5.12 degrees c/m.
*April 28, 2010*

**Chemistry**

You need to find the freezing point of a 1.50m aqueous NaCl solution. You calculate []Tf to be 1.86 degrees C/m x 3.00m or 5.86 degrees C. What is the temperature at which the solution freezes?
*April 27, 2010*

**Chemistry**

Calculate the grams of solute required to make the following solutions. a)2500g of saline solution (0.90% NaCl (m/m)) b)0.050kg of 4.0% (m/m) MgCl2
*April 27, 2010*

**socials studie 11**

explain why germans were so successful in warfare?
*April 27, 2010*

**social studies 11**

what is the significance of the mircale of dunkirk?
*April 27, 2010*

**chemistry**

An ice cube with a mass of 40.0 g melts in water originally at 25.0 degree C. a. How much heat does the ice cube absorb from the water when it melts. Report the answer in calories, kilocalories, joules b. Calculate the number of grams of water that can be cooled to 0 degreeC ...
*April 27, 2010*

**Chemistry**

Wouldnt it be 50mL/2550mL x 100 ??
*April 26, 2010*

**Chemistry**

What is the concentration, in percent (v/v) of a solution containing 50mL of diethyl ether (C4 H10 O) in a 2.5L of solution?
*April 26, 2010*

**physics**

two small objects, A and B, are fixed in place and separated by 3.00 cm in a vacuum. object A has a charge of +2.00 micro coulomb , and object B has a charge of -2.00 micro coulomb. how many electrons must be removed from A and put onto B to make the elecrtostatic force that ...
*April 26, 2010*

**physics**

Two particles, with identical positive charges and a separation of 2.60 x 10^-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration a1 whose magnitude is 4.60 x 10^3 m/s^2, while particle 2 has an acceleration a 2 whose magnitude is 8.50 x ...
*April 26, 2010*

**physics**

Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 119 m/s, and along the bottom surface with a speed of 105 m/s. (b) If the area of the wing is 40 m2, what is the net upward force exerted on the wing?
*April 25, 2010*

**Accounting**

Target corp is currently seeking additional capital to expand it's operation. Two companies have shown interset. The first company would like to have part ownership. Company 2 would like to provide target with a loan. Write a memo in which you explain what information from...
*April 24, 2010*

**chemistry**

Please help me with this question. Give the formula for calcium phosphate and then answer the following questions: (a)Calculate the percent composition of each of the elements in this compound. (b)If you knew that there was 50.0g of phosphorus in your sample,how many grams of ...
*April 22, 2010*

**Accounting**

you need a smaller useful life like 5 or 10 year then you take the salvage minus the cost of the van and then you divide that amount by the useful life. Here is an example $20,000.00- $5,000.00= $15,000.00/ 10years = $1,500.00 is the amount of depreciation. Hope this helps
*April 22, 2010*

**physics**

four identical metallic objects carry the following charges: 1.6, 6.2, -4.8, and -9.4 μC. the objects are brought simultaneously into contact, so that each touches the others. then they are separated. what is the final charge on each object? how many electrons (or protons...
*April 22, 2010*

**math**

(perimeter of my square) divided by ( sum of 2 side-lengths of my square)=
*April 21, 2010*

**ALGEBRA**

A convention manager finds that she has $ 1410, made up of twenties and fifties. She has a total of 48 bills. How many fifty-dollar bills does the manager have?
*April 21, 2010*

**Physics**

.38rad/s
*April 20, 2010*

**chemistry**

What is the Lewis Dot Diagram For Castor Oil?
*April 20, 2010*

**Chemistry**

How can the Tyndall effect be used to distinguish between a colloid and a solution? Can the presence of Brownian motion distinguis between a solution and a colloid? explain.
*April 19, 2010*

**ochem**

What's an equation of the hydrolysis of one ester group in tannins by CaCO3?
*April 15, 2010*

**marketing**

I have to understand the model and the factors when it comes to my product Nintendo Wii.
*April 14, 2010*

**marketing**

Describe the model of consumer buyer behavior. you must explain how the process works in the real world. Seclect one of the four factors influencing buyer behavior.
*April 14, 2010*

**organic chemistry**

What's an equation of the hydrolysis of one ester group in tannins by CaCO3?
*April 14, 2010*

**Chemistry**

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)
*April 13, 2010*

**Chemistry**

Which of the following substances dissolve to a significant extent in water? Explain your answer in terms of polarity. a) CH4 b) KCL c)He d)MgSO4 e)sucrose f)NaHCO3
*April 13, 2010*

**Chemistry**

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)
*April 13, 2010*

**calculus**

Thank you very much. I think somewhere between wrong slopes and a mix-up in the point-slope form equation, I messed up the equations. But I got it now. Thanks a lot!
*April 13, 2010*

**calculus**

Oops, for the interval of the first one it's [-5,2]. Typo.
*April 13, 2010*

**calculus**

Hi, I have online homework for calculus and I have to input two equations that will describe this graph. I have an image but Jiskha won't let me link to any websites... if this is allowed the URL to the image of the graph is img145.imageshack.us/ img145/1787/80193630 .png ...
*April 13, 2010*

**algebra**

solve by elimination 7r-3s=-17 3r+7s=59
*April 11, 2010*

**Economics**

If the government wanted to encourage a monopoly to produce the socially efficient quantity, should it use a per-unit tax or a per-unit subsidy? Explain how this tax or subsidy would achieve the socially efficient level or output. Among the various interested parties—the ...
*April 9, 2010*

**economics**

. If the government wanted to encourage a monopoly to produce the socially efficient quantity, should it use a per-unit tax or a per-unit subsidy? Explain how this tax or subsidy would achieve the socially efficient level or output. Among the various interested parties—...
*April 8, 2010*

**Math**

10 multiple choice questions each with three possible answers only one of which is correct. A student guesses the answer to every question. (a)What is the probability that the student will answer the first six questions correctly and the rest incorrectly? (b)What is the ...
*April 7, 2010*

**XECO 212**

How would I go about finding the answer to economists are quoted using normative statements in 2011?
*April 6, 2010*

**accounting**

Prepare adjusting journal entries for the year ended (or date of) December 31, 2005, for each of these separate situations. Assume that prepaid expenses are initially recorded in asset accounts. Also assume that fees collected in advance of work are initially recorded as ...
*April 6, 2010*

**Chemistry**

Lithium nitride reacts with water to form ammonia and aqueous lithium hydroxide. Li3N(s) + 3H2O(l) ==> NH3(g) + 3LiOH(aq) a)What mass of water is needed to react with 32.9g Li3N? b)When the above reaction takes place, how many molecules of NH3 are produced? c)Calculate the ...
*April 5, 2010*

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