Sunday

May 29, 2016
Total # Posts: 3,623

**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*

**business law**

assuming the BOTH sides have rights. They do not. Artists, musicians, writers and others have ABSOLUTE control over their works and how they might be consumed, or distributed. The only right the public has is to buy it under the conditions offered or move on to something else...
*October 31, 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*

**social work**

My Question is “ What is a mediation model” Locate and read an article in the University Library related to a mediation model. Write a 350-word summary of your article. Be sure to address the following your summary: • Identify the setting and populations most ...
*October 28, 2011*

**social work**

Assignment reads Locate and read an article in the University Library related to a mediation model. Write a 350-word summary of your article. Be sure to address the following your summary: • Identify the setting and populations most appropriate for the model described in...
*October 28, 2011*

**Math**

Frank has eight quarters in his pocket.how much money does he have.
*October 27, 2011*

**Science**

Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring Time (sec) No stirring 25 Slow stirring 18 Medium stirring 10 Fast stirring 6 Which conclusion should ...
*October 25, 2011*

**government**

given that a major crisis facing the G20 is the value of the Euro in certain Euro zone countries, what role should the u.s. play? what is U.S. business exposure if the Euro zone collapses?
*October 25, 2011*

**Physics**

a system consists of four particles how many terms appear in the expression for the total gravitational potential energy of the system
*October 22, 2011*

**Math**

CRANES Season 1: Wins 38 Season 2: Wins 42 Season 3: Wins 31 Season 4: Wins 50 Season 5: Wins 31 Season 6: Wins 48 PANTHERS Season 1: Wins 36 Season 2: Wins 42 Season 3: Wins 40 Season 4: Wins 40 Season 5: Wins 42 Season 6: Wins 40 Which team had the better record? Justify ...
*October 20, 2011*

**Math**

Can you explain to me the procedure to get 32 tiles. Thank you for your help.
*October 20, 2011*

**chemistry**

A gas cylinder of volume 5.00 L contains 1.00 g of Ar and 0.500 g of Ne. The temperature is 275 K. Find the partial pressure of Ne.
*October 20, 2011*

**math**

Write a situation that can be represented by the algebraic expression $3.50t.
*October 18, 2011*

**Math**

Yes 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
*October 18, 2011*

**Math**

The secret number has a 7 in the ones place.The tens number is an odd number.
*October 18, 2011*

**mary**

The secret number has a 7 in the ones place.Then tens number is an odd number.
*October 18, 2011*

**chemistry**

An object with a mass of 7.8 g raises the level of water in a graduated cylinder from 25.1 mL to 31.8 mL. What is the density of the object?
*October 18, 2011*

**Math**

The secret number has a 7 in the on place. The tens number is a ann odd number.
*October 18, 2011*

**Math**

Reasonnablenes the flag that Nico waves has an odd number in the ones place and even number in the tens place.what flag does he wave? Number on racing flag red flag 25 blue flag14 yellow 32 green flag 6 orange flag 17
*October 18, 2011*

**Chemistry Lab**

There would be no change in the solution color
*October 18, 2011*

**chemistry**

Have 250 mL of a 0.80 M solution of silver nitrate AgNO3 dissolved in water. how many grams of AgNO3 does the solution contain
*October 18, 2011*

**chemistry**

If the maximum sensitivity of absorbance is at 450nm would the same value of K be obtain at 400nm or 500nm? Please explain.
*October 18, 2011*

**MATH HELP PLEASE!**

Let c be a positive integer with 1<=c<=n. Show that the set: W ={ó exists in Sn such that ó(c)=c} is a subgroup of Sn. (The set W is called the stabilizer of c, because every element in W leaves c fixed.)
*October 14, 2011*

**Math**

1/8b = 6 what is b=
*October 13, 2011*