Wednesday

January 28, 2015

January 28, 2015

Total # Posts: 3,334

**chemistry**

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.
*January 31, 2012*

**Chem 11**

im assuming you mean "moles" not "miles" (4.059g sample/1)x(1 mole sample/g of sample in one mole(take number of elements in formula multiplied by individual grams found in the periodic table)). there is your answer. easy as pie.
*January 31, 2012*

**Math**

2 sheets of paper for 30 studens: 2(30) if she has 19 and needs more subtract 19 from 2(30). example: (2(30))-19.
*January 31, 2012*

**Physics Help!**

A 220 uF capacitor with a 10% tolerance rating is charged. The voltage across the capacitor is measured to be 110 +/- 5.5 volt. Calculate the electrical charge stored in the capacitor. Estimate the error in the charge by propagating the uncertainty in the capacitance and the ...
*January 27, 2012*

**Math**

How do I set this up and solve it? Tom has a collection of 30 CDs and Nita has a collection of 15 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 4 CDs a month to her collection. Find the number of months after which they will have the same number of CDs.
*January 27, 2012*

**Physics!! Help!!!!!**

The time dependence of voltage across a discharging capacitor is given by the exponential decay. The voltage on the capacitor at time t= 0 sec is 24 volt. If a 220 +/- 22uF capacitor and 1 Mega ohm (5% tolerance) resistor are used in the RC circuit, what would be the value of ...
*January 26, 2012*

**calculus**

Find f'(a). f(t) = t^4 − 7t
*January 26, 2012*

**Math**

Reasoning What is the greatest number you can make using these digits? 572. ..... 257 572 725 752
*January 26, 2012*

**harris middle school**

a bag contains 5 red marbles,4 white marbles, and 9 blue marbles. you pick a marble without looking. find the probability of drawing a white marble.
*January 26, 2012*

**Business English**

your application will be processed by next Thursday
*January 25, 2012*

**chemistry**

Air is 20.9% oxygen by volume.How many mL of air contains 175 mL of oxygen?
*January 25, 2012*

**Math**

a farmer wants to put a fence around a rectangular field and then divide the field into three rectangular plots by placing two fences parallel to one of the sides. if the farmer can only afford 1000 yards of fencing, what dimensions will give the maximum rectangular area?
*January 22, 2012*

**math**

How can I figure out the the estimate the diffrence between 53 and 37?
*January 19, 2012*

**logic**

Mary is poor. She has not been able to find a job and has two children she needs to feed. Assume Mary is forced to let her children go hungry or steal some food from a local grocery store. Which should she do? Construct an argument that supports Mary's decision to steal ...
*January 19, 2012*

**science**

what helps a camel walk on sand?
*January 18, 2012*

**college algebra**

, for this problem f(x)=3x^2-6x-7,what is the minimum value and where do it occurs, and what is this functions domain and range?
*January 17, 2012*

**geometry**

a solid aluminum cube measuring 15 inches on a side is melted and rolled into an aluminum wire tat is 0.2 inches in diameter. what will be the length of this wire?
*January 17, 2012*

**chemistry**

Energy in the amount of 470 J is added to a 30.0 g sample of water at a temperature of 9.00 degrees C. What will be the final temperature of the water?
*January 16, 2012*

**Compounded monthly**

P - Po(1 + r/n)nt P = $10,000 r = 6.5% n = 12 t = 216MO
*January 16, 2012*

**pre- calculus**

consider the collection of all rectangles that have lengths 2in. less than twice their widths. find the possible widths(in inches) of these rectangles if their perimeters are less than 200 in
*January 16, 2012*

**business studies**

why do we study shorthand.
*January 11, 2012*

**physics**

calculate speed of 8.0 times 10 to the 4th kilogram airliner with a kinetic energy of 1.1 times 10 to the 9th jewles
*January 7, 2012*

**ap chemistry**

what is the pH of 2.50M HF (aq)? Ka=7.2X10^-4
*January 6, 2012*

**disasters**

why is the idea of a zombie apocalypse possible. this is serious i need to write a 5 page paper on it and i have NOTHING D:
*January 3, 2012*

**Chemistry**

a 2.16g sample of Pb(NO3)2 is heated in an evacuated cylinder with a volume of 1.18L. the salt decomposes when heated: 2Pb(NO3)2 (s)_> 2PbO (s) +4NO2 (g) +O2 (g) Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a final...
*January 3, 2012*

**chemistry**

Boron forms a gaseous compound with hydrogen with empirical formula BH3. a 1.05L sample of this compound at a pressure of 88 mm Hg at 295K has a mass of .138g. what is the molecular formula of the compound?
*January 3, 2012*

**math**

is/of = %/100 1.8m/x = 4/100 1.8m = (4/100)(x) (1.8m)/(4/100) = x x=45meters (always remember is/of = %/100) it comes in handy even in real life while shopping for good sale deals.
*January 3, 2012*

**english**

I take a considerable amount of time on my English course, because it is difficult to write and research topics.
*January 3, 2012*

**science 7th grade**

calculated error. id go back and check if i were you.
*January 2, 2012*

**Math**

Use multiplication, division, addition and subtraction and at least one set of parentheses to write an expression that simplifies to 7, 13, or 17. Do your work step by step and explain each step as you simplify the expression. Demonstrate the consequences of not using the ...
*December 25, 2011*

**chemistry**

5 mg iodine 131 its half life is 8.1 days what is the time when 1% remain
*December 23, 2011*

**PHI 103**

"Thomas Jefferson owned slaves, so slavery must have been a good idea" may commit which fallacy? A. appeal to pity B. no fallacy committed C. Appeal to falso authority D. Appeal to ignorance
*December 15, 2011*

**Social studies**

I need sentence verb for present.past,and future.
*December 14, 2011*

**Social studies**

Verbs for present. Past and future write about something you could invent. Tell how people will use your invention.some verbs you can use are invent,use,like,and name.Write at least 3 sentence, under line the verb in the sentence.
*December 14, 2011*

**Math**

Noah has 75cent .he gives his brother 25 cent. Now Noah has
*December 13, 2011*

**Math**

Problem solving Marie takes 22cent from her coin bank.Now she has 49cent left .how much did she start with?
*December 13, 2011*

**Marh**

Problem solving. Marie take 22cent from .now she has 49 cent left. How much money did she start with.
*December 13, 2011*

**Marh**

Add or subtract to solve . Teri has 42 cent. Her mom give her 19 cent .now teri has
*December 13, 2011*

**MATH**

Show that the direct sum of two integral domains (E and H) is never an integral domain.
*December 13, 2011*

**math**

(1/3)*(2/5) both of these are to the third power outside the (p) please help
*December 11, 2011*

**Spanish 1**

I have a textbook that has been nothing if not frustrating. Our homework is done online, and I have found mistakes in it (and I'm new at this). It is a first edition and the company refuses to fix the errors until its next edition. The text is called: Experience Spanish- ...
*December 8, 2011*

**Spanish 1**

The directions on this question say, "Usando los verbos de la lista, dé el mandato formal que mejor completa cada oración." My choices to choose from are: dar estar ir ser The question is: ________muchas atenciones a los invitados. I thought it was dar...
*December 8, 2011*

**Spanish 1**

(Darme) a cuchara. I am supposed to replace Darme with the mandate form of the word. I replaced it with dénme, but that didn't work. What is the right form?
*December 8, 2011*

**Social studi**

I need verb sentence .Juno (read, reads) a letter from his grandma.
*December 7, 2011*

**Social studi**

I need the verb end each sentence.the boy ( send,sends)letter to his grandma.
*December 7, 2011*

**Chemistry**

The density of an elemental gas is 1.7824 g/L at STP. What is the molar mass of the element?
*December 7, 2011*

**Finance**

Calculate the value of N for which Value at Risk is twice as much as the DEAR.
*December 6, 2011*

**math**

Jack is twice as old as he was 5 years ago. His mother was then six times as old as he was. She is now 35 years old. how old is jack?
*December 5, 2011*

**Chemistry**

A balloon is floating around outside your window. The temperature outside is 39 degree celsius, and the air pressure is 0.800atm . Your neighbor, who released the balloon, tells you that he filled it with 3.10 moles of gas. What is the volume of gas inside this balloon?
*December 4, 2011*

**organic chemistry**

*structure of the product formed
*December 2, 2011*

**organic chemistry**

Give the product of the structure formed when 2-methyl-2-butene reacts with bromine in water
*December 2, 2011*

**Chemistry**

Kc for the reaction of hydrogen and iodine to produce hydrogen iodide, H2(g)+I2(g)f 2HI(g) is 54.3 at 430C. What will the concentrations be at equilibrium if we start with 0.240M concentrations of both H2 and I2?
*November 29, 2011*

**geometry**

in an isosceles triange with base angles at (0,0) and (7,0), how do I find the coordinates of the 3rd angle?
*November 27, 2011*

**chemistry!!**

The pH of an aqueous solution is 3.25. a. Calulate the concetration of the hydronium ions in the solution. b. Calulate the concetration of the hydroxide ions in the solution.
*November 26, 2011*

**Help in Chemistry!!**

You are given an aqueous solution of hydrofluoric acid. (Recall that hydrofluoric acid is a weak acid; When you are given an aqueous solution of a weak acid you always assume that the dissociation reaction of the acid in water has reached equilibrium) Predict whether the ...
*November 26, 2011*

**phi 103**

Logicians regard the following as the meaning of the word "argument." (Points : 1) A hostile and emotional dispute A poetic tribute to Spring A set of reasons put forth to support a claim The kind of thing one has with a spouse
*November 26, 2011*

**physics**

A still block slides over a still surface,if the mass of the pot is 2.00kg what is the force of friction opposing the motion?coefficient of kinetic friction is taken as 0.42.Gravity is 9.8
*November 24, 2011*

**math**

what is the total and annual returns on an investment of 2 years regular 3700 shares in a start up company, you sell the shares for $2300 (at a loss)
*November 21, 2011*

**Algebra**

A store mixes kentucky bluegrass wothe $12 per pound and chewing fescue for $12 per pound. Howe many of each should be used to make 456 pounds of mixture?
*November 19, 2011*

**math--i just need help getting started--PLEASE! **

Let W be the set of all continuous functions from the set of real numbers R to R. For f,g in W define f+g by (f+g)(x)=f(x)+g(x) and (f*g)(x)= f(x)g(x). Verify that W is a commutative ring. Does W have unity? Why or why not?
*November 18, 2011*

**algerbra**

5x/7
*November 18, 2011*

**physics help**

A 10 g bullet moving at 370 m/s strikes a ballistic pendulum of mass 2kg. The bullet emerges with a speed of 100 m/s. What height does the pendulum rise to? I dont want the answer, i just need hints!!! thnaks
*November 18, 2011*

**chemistry(reacting masses)**

When a 1 g sample of limestone was dissolved in dilute hydrochloric acid completely,0.38 g of carbon dioxide was generated.What was the percentage by mass of calcium carbonate in limestone?(Relative atomic masses : C=12, O=16,Ca=40.1)
*November 18, 2011*

**chemistry**

In an industrial process, the following reaction is carried out in the presence of a catalyst: C2H51 + Cl2 → C2H51Cl12 Calculate the percentage yield if 405.58 grams of C2H51 are used in the reaction and 474.91 grams of C2H51Cl12 are produced.
*November 17, 2011*

**Math**

These animals live in a big garden : 37 snails 49 worms 12 moths
*November 17, 2011*

**chemistry**

Given the following reaction: TiCl4 + O2→ TiO2 + Cl2 If 51.44 g TiCl4 react with 82.32 g O2 complete a mass balance table for this reaction.
*November 17, 2011*

**algebra**

one half the distance from boston to new york minus 25
*November 16, 2011*

**Algera**

x+20 If x is divisible by 4, 5 and 20 by adding a 20 to it will still make it divisible by 20.
*November 15, 2011*

**algebra**

add the three side and set it = to 65. Whhen you get a value for y, find out the other two sides and select the longest
*November 15, 2011*

**math**

what is the question?
*November 15, 2011*

**math **

Prove that R contains a zero divisor if and only if R' does.
*November 14, 2011*

**chemistry**

Suppose that 2.3 L of gas at 35°C and 1.0 atm is expanded to 4.5 L at 42°C. What will the final pressure of the gas be?
*November 14, 2011*

**chemistry**

A sample of gas at 80°C is cooled by 30 degrees until its final volume is 1.75 L. If the pressure remains constant, what was the initial volume of the gas.
*November 14, 2011*

**Math**

How much money should be invested at an annual interest rate of 6.2% compounded continuously, to be worth at least $58,000 after 13 years.
*November 13, 2011*

**math**

-3(x-4)<18 or 6-5x<-9
*November 12, 2011*

**Math**

-3(x-4)<18 and 6-5x<-9
*November 12, 2011*

**psychology**

. Which of the following is the MOST accurate conclusion one can draw about the mental health field?
*November 12, 2011*

**physics**

A 86 kg clock initially at rest on a horizontal floor requires a 649 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 517 N keeps it moving with a constant velocity. (a) Find μs between the clock and the floor. (b) Find μk ...
*November 11, 2011*

**math**

Let W be the set of all continuous fuctions from the set of real numbers R to R. For f, g in W define f+g by (f+g)(x)=f(x)+g(x) and (f*g)=f(x)g(x). Verify that W is a commutative ring. Does W have unity? Why or why not?
*November 11, 2011*

**stats**

This week we practice with Binomial Distribution. You can use Appendix Table E or Excel Function Binomdist. About 30% of adults in United States have college degree. (probability that person has college degree is p = 0.30). If N adults are randomly selected, find probabilities...
*November 10, 2011*

**chemistry**

What is the oxidizing agent in the following reaction? Cl2 (g) + 2Na+ (aq) + 2Br- (aq) --> 2Na+ (aq) + 2Cl- (aq) + Br2 (l)
*November 8, 2011*

**abstract algebra **

Let R be a ring. The center of R is the set C= {x exists in R| ax=xa for all a in R}. Show that C is a subring of R.
*November 8, 2011*

**Finance**

Bond value and time--Constant required returns Pecos Manufacturing has just issued a 15-year, 12% coupon interest rate, $1,000-par bond that pays interest annually. The required return is currently 14%, and the company is certain it will remain at 14% until the bond matures in...
*November 7, 2011*

**chemistry**

How many grams of NaOH (MW = 40.0) are there in 100.0 mL of a 0.275 M NaOH solution?
*November 7, 2011*

**Math**

A bakery sold twice as many cookies in March as in April.Their total sales for the two months were 564 cookies.How many cookies were sold in April? a) 376 b) 282 c) 234 d) 188
*November 7, 2011*

**Statistics**

with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week? ..I don't understand how to figure this question out?
*November 7, 2011*

**Trigonometry**

Calculate and write result in a+bi form. 5+10i/3-4i
*November 6, 2011*

**physics emergency**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 4, 2011*

**Math**

the time x (in days), that it takes a planet to revolve around the sun can be approximated by the equation x=0.407√(d^3),where d is the mean distance of the planet from the sun in millions of miles. It takes Venus approximately 226 days to complete one revolution of the ...
*November 3, 2011*

**Science**

191/4.25=44.9 km/hr
*November 2, 2011*

**Science**

a bus trip covers 191 km and takes 4 hours and 15 miniutes. What is the average speed of the bus in kilometers per hour?
*November 2, 2011*

**PHYSICS: Conservative Forces and Potential Energy **

A mass m = 18 kg is pulled along a horizontal floor with NO friction for a distance d =6.6 m. Then the mass is pulled up an incline that makes an angle θ = 38° with the horizontal and has a coefficient of kinetic friction μk = 0.44. The entire time the massless ...
*November 2, 2011*

**Science**

Plural Noun That Change Spelling .Write the plural noun for each singular noun. Wolf man tooth
*November 2, 2011*

**Computer Applications**

Microsoft Word makes it easier to organize and write documents concerning the reports that law enforcement officers have to fill out every they respond to a call for help and take down the events of what actually happened. They can also edit pictures Microsoft PowerPoint and ...
*November 2, 2011*

**Computer Applications**

How is Microsoft Word, Excel, and PowerPoint used in Criminal Justice?
*November 2, 2011*

**Opinions wanted**

Hi, Allyson. It is not written in the best grammar and the sentences are chopped. Try working on it some more.
*November 2, 2011*

**grammar**

unhappy,lonely, field goal, sport, bust, exploded,
*November 2, 2011*

**Chemistry**

How many milliliters of 0.201 M Ba(OH)2 solution are needed to completely neutralize 12.8 mL of 0.369 M HNO3 solution? The reaction is Ba(OH)2(aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(l)
*November 1, 2011*

**physics science**

if you wish to warm 95 kg of water by 20.0c for your bath how much heat is required
*October 30, 2011*

**social work**

no I did not but thank you
*October 28, 2011*

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