Wednesday
October 1, 2014

Posts by Kim


Total # Posts: 2,090

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

Chemistry
Methanol (CH3OH) is used in the production of many chemicals. methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ==> CH3OH(g) a) How many moles of each reactant are needed to produce 3.60 x 10^2 g CH3OH? b)Calculate ...
April 5, 2010

Physics
How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted. Not sure if this is relevant to finding the ...
March 30, 2010

Physics
How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted. Not sure if this is relevant to finding the ...
March 30, 2010

geometry
2 complementary angles are in the ratio of 5:13. Find the measure of each angle?
March 28, 2010

Chemistry
If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9g of silicon carbide is produced. SiO2(s) + 3C(s) --> SiC(s) + 2CO(g) what is the percent yield of this reaction?
March 28, 2010

Chemistry
When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g) what is the theoretical yield of iron?
March 28, 2010

HSM240
I need an opinion please. My assignment says write 1,750- to 2,100-word proposal paper on a social program that you create. Pretend that you have the power and capacity to create an agency or organization and decide to create a new social program. Can you tell me if I am on ...
March 27, 2010

medical -health
you woek in the hospital's health information management department. part of your job is to assist the medical residents with completing records documenttation. one of the residents complains that he doesn't understand why insurance companies need so much documentation...
March 16, 2010

ap physics
work=20,580J power=686 watts
March 14, 2010

History
Which Native American tribe were the traditoinal alliis of New France
March 12, 2010

Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 1/5x -1/4 y = 3 2/5x + 1/2y = 2
March 11, 2010

Statistics
A card is picked at random from a pack of 20 cards numbered 1-20. given that the cards shows an even number, find the probability that it is a multiple of 4
March 9, 2010

chemistry
what mass of sodium acetate, NaCH3CO2, must be added to 1.0 L of 0.10 M acetic acid to give a solution with a pH of 4.50?
March 9, 2010

Chemistry
kilojoules to heat 250kg of gold from 18c to 184c
March 8, 2010

science
What is the net force of 25n downward and 45n upward?
March 4, 2010

Intro to Technology
idk
March 4, 2010

FINANCIAL MANAGEMENT FOR HUMAN SERVICE MANAGERS
Explain your understanding of the two procurement strategies listed in the text. Which of the two procurement strategies is most effective for a human service agency? Explain your reasoning.
March 4, 2010

2nd grade
how do I count the vertices of a rectangle
February 23, 2010

Organic chem
methanol*
February 20, 2010

Organic chem
I just need some clarification regarding SN1 reactions Okay...so a reaction with a secondary ALKYL HALiDE + CH3OH (Methanal), why is the nucleophile CH3O? why doesn't it dissociate to give CH3 and OH?
February 20, 2010

pre calc
1. For the following functions listed below: (a) f(x) = -2cosx f(x) = 0.25sinx (b) f(x) = -3sin(2x+3)+7 f(x) = sinx + 4 Find : (i) the amplitude (ii) the period
February 12, 2010

Math
MISSING DIMENSION ROUND TO NEAREST TENTH.. QUESTION; THE SCALE OF A MAPIS 3in =6.82 mi map :_________ in actual 2.3 mi
February 10, 2010

math
The cargo area of the deck of a barge is 60 ft wide. Cargo containers are 7 ft wide, and can be placed side-by-side with a gap of 6 in between them. How many containers may be placed side-by-side on the deck of the barge?
February 10, 2010

math
The last-place finisher in the 2006 Nissan Golf Tournament won $9,078. How many tournaments would a person earning this much have to play in to reach $1 million?
February 10, 2010

Math
what type of example can you give me using the 3 quantities (amount, base and rate)given as to how to solve each when one is missing?
February 10, 2010

history
What were the names of Herbert Hoover's son's 2 pet alligators?
February 7, 2010

English
How does one cite from this form in APA form? I want to use something that would work for me but I don't know how to cite from this form. Please help.
February 6, 2010

physics
It's the anser in the book... Schaum's outline, college physics... 10th edition???
February 3, 2010

physics
What displacemtn at 70 degrees has an x-component of 450m? What is its y-component? I know the answers are 1.3 and 1.2... but don't know how to work it out?? PLEASE HELP!!
February 3, 2010

11th grade
What do you call a female bug that floats? it has to do with algebra. It shows you solutions and graphs. the graphs have letters in front of them so you can try and figure out what the answer is.
February 3, 2010

Language Arts
What are some articles on "Hate Crimes" do to Race, Religion, Sex, Ethnic Background...etc.?
February 2, 2010

accounting
What does a zero economic profict mean?
January 31, 2010

biology
3. In what cells do meiosis and mitosis take place? 4. If one strand of DNA, had bases ordered ATCCGTC, what would be the bases of its other strand?
January 31, 2010

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