Monday

November 30, 2015
Total # Posts: 300

**chemistry **

thanks :)
*October 29, 2010*

**chemistry **

Suppose you mix 20.1 g of water at 66.2°C with 44.6 g of water at 35.7°C in an insulated cup. What is the maximum temperature of the solution after mixing?
*October 29, 2010*

**chemistry **

Carbon disulfide is a colorless liquid. When pure, it is nearly odorless, but the commercial product smells vile. Carbon disulfide is used in the manufacture of rayon and cellophane. The liquid burns as follows. CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g) Calculate the standard...
*October 29, 2010*

**CALC HARD...**

2x+2y=430 (x being the diameter and a side; y being another side) That would be your starting equation. I think :)
*October 29, 2010*

**chemistry **

Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2 NH3(g) Δ...
*October 29, 2010*

**physics**

A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller box doesn't slide on top of the ...
*October 28, 2010*

**physics**

A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller box doesn't slide on top of the ...
*October 27, 2010*

**physics**

A 1.5 kg chunk of ice slides down a roof sloped at a 60 degree angle with the horizontal. If there is no friction, determine the acceleration of the ice. Show that the amount of mass doesn't matter in part a.
*October 26, 2010*

**physics**

so i won't have a numerical answer?
*October 26, 2010*

**physics**

sorry, what's mg?
*October 26, 2010*

**physics**

A water slide can be thought of as being frictionless. Let's say a slider starts from rest and goes down a slide that is 30 m long and is set at a 25 degree incline. a) Determine the speed of the slider at the bottom of the slide. b) Explain why you don't need to know ...
*October 26, 2010*

**chemistry **

A mixture contained zinc sulfide, ZnS, and lead sulfide, PbS. A sample of the mixture weighing 6.12 g was reacted with an excess of hydrochloric acid. The reactions are given below. ZnS(s) + 2 HCl(aq) → ZnCl2(aq) + H2S(g) PbS(s) + 2 HCl(aq) → PbCl2(aq) + H2S(g) If ...
*October 24, 2010*

**chemistry **

I keep getting d=0.00441. I'm not sure what I'm doing wrong. My equation with the numbers substituted in looks like this: (0.98421)(0.10853)=d(0.08206)(295.15)
*October 24, 2010*

**chemistry **

A sample of a breathing mixture for divers contained 34.3% helium, He; 51.7% nitrogen, N2; and 14.0% oxygen, O2 (by mass). What is the density of this mixture at 22°C and 748 mmHg?
*October 24, 2010*

**chemistry **

what equation would you have to use here?
*October 24, 2010*

**chemistry **

Raoul Pictet, the Swiss physicist who first liquefied oxygen, attempted to liquefy hydrogen. He heated potassium formate, KCHO2, with KOH in a closed 2.50 L vessel. KCHO2(s) + KOH(s) → K2CO3(s) + H2(g) If 50.1 g of potassium formate reacts in a 2.50-L vessel, which was ...
*October 24, 2010*

**chemistry **

At what temperature does the rms speed of Cl2 molecules equal 401 m/s?
*October 24, 2010*

**Economics!**

if a business firm operates indefinitely without covering any of its sunk costs,what happens to these costs? A.they continue unpaid for as long as the firm fails to make a profit large enough to cover them B.nothing happens to them;they have cease to exist C.they reduce the ...
*October 12, 2010*

**Physics**

A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 28.0 m/s. A net is positioned a horizontal distance of 51.0 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil?
*September 30, 2010*

**chemistry **

I got the grams of NO, but how do you do the limiting reagent problem?
*September 26, 2010*

**chemistry **

Hydrogen cyanide, HCN, can be made by a two-step process. First, ammonia is reacted with O2 to give nitric oxide, NO. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) Then nitric oxide is reacted with methane, CH4. 2 NO(g) + 2 CH4(g) → 2 HCN(g) + 2 H2O(g) + H2(g) When 25.6 ...
*September 26, 2010*

**chemistry **

Aluminum metal reacts with iron(III) oxide to produce aluminum oxide and iron metal. (a) How many moles of Fe2O3 are required to completely react with 55 g Al? mol (b) How many moles of Fe are produced by the reaction of 3.00 mol Fe2O3 and 97.7 g Al? mol (c) How many atoms of ...
*September 25, 2010*

**chemistry **

A 2.9-L sample of paint that has a density of 4.65 g/mL is found to contain 26.7 g Pb3N2(s). How many grams of lead were in the paint sample?
*September 25, 2010*

**chemistry **

I need help with this problem, and it's due tomorrow.
*September 25, 2010*

**chemistry **

Hydrogen cyanide, HCN, can be made by a two-step process. First, ammonia is reacted with O2 to give nitric oxide, NO. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) Then nitric oxide is reacted with methane, CH4. 2 NO(g) + 2 CH4(g) → 2 HCN(g) + 2 H2O(g) + H2(g) When 25.6 ...
*September 25, 2010*

**science**

heat transferses from the sun to the soil in something called radiation.. :)
*June 3, 2010*

**english**

aww i like it thanks sooo soo soo muchhh!! <3
*June 3, 2010*

**english**

i need help finding a titale for my essay. it is a personal narrative about my family.. the theme is laughter.. i really need help
*June 3, 2010*

**english**

JL.. dont be too harsh.. he probably new that :)
*June 3, 2010*

**english**

hii it should read.. In case you were wondering if I got lost, I reached my destination safely. i hope it works!
*June 3, 2010*

**algebra**

yupp looks good!
*June 3, 2010*

**algebra**

samee!!.. but im also taking geometry.. and im studying to become an engineer
*June 3, 2010*

**9th grade (Algerbra)**

hahaha thats cutee
*May 17, 2010*

**math**

spacial area.I dont get it!!!!
*May 11, 2010*

**world history**

Why was the Parthenon, Theater of Dionysus, The Temple of Delphi, The Agora, and the Marble Shop important to Ancient Greeks in Athens?
*April 25, 2010*

**chemistry!**

how many moles of product are formed in the reaction? 2Al(s),3Cl2(g)--->2AlCl3(s) please help me!! thank you so much
*March 31, 2010*

**chem**

and another question how many moles of product are formed in the reaction? thank you so much!
*March 31, 2010*

**chem**

3/2 times 3.30?
*March 31, 2010*

**chem**

How many moles of chlorine are needed to react with 3.30 moles of aluminum?
*March 31, 2010*

**chem**

Heating an ore of antimony (Sb2S3) in the presence of iron gives the element antimony and iron(II) sulfide. Sb2S3(s) + 3 Fe(s) 2 Sb(s) + 3 FeS(s) When 10.9 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction? could you please ...
*March 31, 2010*

**chemistry**

how many moles Sbs are left!?
*March 31, 2010*

**algebra**

how do you convert these 2 problems to slope intercept form? -2x=-1y-6 3x+3y=-18
*March 23, 2010*

**8th grade math**

do you have anything on linear equations or categories on FCAT because I need to study. :)
*March 8, 2010*

**8th grade Math**

do you have anything on linear equations or categories on the FCAT. i need to study :)
*March 3, 2010*

**chem**

A mixture of gas contains 1.25g of N2, 1.25g of O2, and 1.25g of He in 2.50 L container at 25 C. Find the partial pressure of N2 in the container?
*February 26, 2010*

**literature**

What is the theme and conflict of Mark Twain's short story,"The Private History of a Campaign that Failed"?
*February 25, 2010*

**8th grade Math**

90+45= 135 180-135= 45
*February 16, 2010*

**Math B**

The path of a rocket fired during a fireworks display is given by the equation s(t)=64t2-16t2,( t do the 2nd power) where t is the time in seconds and s in the height in feet. What is the maximum height in feet the rocket will reach? In how many seconds will the rocket hit the...
*January 29, 2010*

**Math B**

The path of a rocket fired during a fireworks display is given by the equation s(t)=64t2,( t do the 2nd power) where t is the time in seconds and s in the height in feet. What is the maximum height in feet the rocket will reach? In how many seconds will the rocket hit the ...
*January 29, 2010*

**Algebra**

Which algebraic expression has the same value as 32x + 8 ? explain answer..thanks 4(x+2) 8(4x+1) 4(8x+1) 8(4x+8)
*January 12, 2010*

**algebra**

32x+8=? Which algebric expression has the same value, explain method, please.. 4(x+2) 8(4x+1) 4(8x+1) 8(4x+8)
*January 12, 2010*

**LAnguage arts**

Are these correct Neither Jake nor Sue gets seasick. Are Jake and they ready with their math project? Every one of the students I spoke to said he/she liked his/her math class. If a person loses his/her jacket, he/she can check the lost and found. Each of the boys likes to go ...
*December 20, 2009*

**language arts**

sentence corrections Every one of the students I spoke to said they liked their math class. If a person loses their jacket, they can check the lost and found. Each of the boys likes to go out for ice cream after they win a game. My mom gave my sister and I money to spend at ...
*December 20, 2009*

**physics**

can you get the answers to b and c?
*December 1, 2009*

**physics**

T=2*M*g I can't get the other parts.
*December 1, 2009*

**physics**

this is wrong
*December 1, 2009*

**physics**

One end of a light spring with force constant 300 N/m is attached to a vertical wall. A light string is tied to the other end of the horizontal spring. The string changes from horizontal to vertical as it passes over a solid pulley of diameter 6.00 cm. The pulley is free to ...
*November 30, 2009*

**French**

Thank you!!
*October 22, 2009*

**French**

What does "Quelle est la date de son anniversaire" mean? I think it means "What is the date of his/her birthday?" Is that correct?
*October 22, 2009*

**math**

Those two lines mean the absolute value of. So if it was |-2|, the absolute value of |-2| would be 2. I hope that helps! :)
*October 22, 2009*

**French**

Thank you so much!! Also, what does "Quelle est la date de son anniversaire?" mean? I think it means "What is the date of his/her birthday?" Is that correct? Thanks!! :)
*October 22, 2009*

**French**

Hi! Could anyone tell me what "Je ne deteste pas" means?
*October 22, 2009*

**science**

would a plant be considered a cell and an organism?
*September 27, 2009*

**rounding**

is 2767 + 7445 = 10,200 by rounding? i got 2800+7400= 10,200
*September 10, 2009*

**math**

functions f(x)=rad. x-9 write the intervals of the functions. How do I put the set of numbers in the form of intervals such as infinity. I solved it and got the answer as this: x < or = 9 (infinity,9] Please help me, I am stuck.
*September 9, 2009*

**Social Studies**

Okay, I'll be sure to check them out! Thanks for your help!!
*May 6, 2009*

**Social Studies**

Thank you so much!! That really helped. Any more links would be very helpful [:
*May 6, 2009*

**Social Studies**

Does anyone know what kind of education a Medieval Princess received? I know they didn't get as much as boys and learned more about the arts, manners, and such...but I need like a source where I can read about it more. Could anybody give a website that could help?? Thanks...
*May 6, 2009*

**Chemistry**

When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of a white precipitate. The chemical was.... a. the household ammonia NH3 b. baking soda NaHCO3 c. ...
*April 12, 2009*

**Math**

Please help with this problem! Planet Pemdas is a perfect sphere that does not rotate. If a rocket flies in a path following the circumference of Pemdas, and maintains a constant altitude of 25,000 feet above the surface for one orbit, how many more feet than the planet's ...
*April 7, 2009*

**Math**

Please help with this problem! What is the positive three-digit integer that is four times the product of its digits?
*April 7, 2009*

**Math**

Please help with this problem! Brandon wishes to fence in a rectangular area of his lawn for his rabbit. If the measure, in feet, of each side of the enclosure is a positive integer and the perimeter of the enclosure is 70 feet, what is positive difference between the area of ...
*April 7, 2009*

**Math**

Please help with this problem!! Assume a, b and c are positive integers such that c cubed=a squared-b squared. If c is the least odd integer for which this is true, what is the least possible value of b?
*April 7, 2009*

**algebra 1 page 167 did you hear about...**

what are the PROBLEMS for this page? I lost mine :(
*February 22, 2009*

**Algebra (URGENT!)**

Can you help me with this problem: Find a formula for the distance from the point (X1, Y2) (The numbers next to X and Y are like X sub 1, Y sub 2...)
*January 12, 2009*

**algebra Urgent!**

I need help with the problem: A is a constant such that the graph of the equation Ax-3y=6 passes through the point (1,-3). Find A.
*January 12, 2009*

**Chemistry**

is anyone going to answer the question?
*November 29, 2008*

**Research Project on Computer Confidentiality**

I am relieved to know that more people are having this problem. I can't find any info either. I too have been working on it for weeks. I am two tests ahead but can't turn it in because of this paper that is impossible. Goodluck to you all.
*November 12, 2008*

**AED 200**

As the supply of teachers diminishes, the demand on new and existing teachers increases. As a potential teacher and educator, identify two perceived challenges of the teaching profession that you may struggle with most. In contrast, identify two opportunities you may have as a...
*July 7, 2008*

**com150**

if you need help catwomen 228 yah. I would be happy too caroline
*July 6, 2008*

**com150**

I can no give out my email address so here it is catwomen 228 yah. I hope you figure this out and I would be glad to help you
*July 6, 2008*

**com150**

I just took this class and got an A- in it I would be glad to help you out. Which article did you choose? "How telephones work" What type of introduction does the writer use? "Include Interesting facts about the subject." What is the impact of that kind of ...
*July 6, 2008*

**Critical Thinking**

I needed it for APA Format
*April 3, 2008*

**Critical Thinking**

what is the notion for subsequent multiple authors in a citation
*April 3, 2008*

**cultural diversity**

stereotyping can affect grop relations in a negative manner because the thought of being labelled as some particular group sets in which spoils the relations of groups with each other.thius is when a grop is stereotyped as being inferior or less than another group.
*April 3, 2008*

**Social studies**

What effects does mining have on the environment? what are the pro's and con's of mining?
*March 31, 2008*

**science**

hi do you know where the asthenosphere is located ?
*March 16, 2008*

**algebra**

How do I simplify (-2b^3)^4-3(-2b^4)3 ?
*February 5, 2008*

**algebra 1**

yes but in the first one (#10) the 1/2 and the 2 is not included. I dont know what to do with that.
*February 5, 2008*

**algebra 1**

express the area of each triangle as a monomial. 10. height-2n^2 base- 5n^3 11. height- 4ab^5 base- 3a^4b
*February 5, 2008*

**science**

Bess filled a syringe with water and left it by the sink in the sunshine. Ten minutes later she saw a puddle of water under the syring tip so she thought it was broken, but it wasnt. What do you think caused the little puddle of water to appear under the syringe tip?
*February 4, 2008*

**Algebra**

Jake has a 3 foot long peice of wood that he wants to make into a triangular frame. He cuts a peice off of the board that is 1 foot 5 inches long. From the remaining board he cuts off another peice that is 7 inches long. He now has 3 peices of wood. Will he be able to fit 3 ...
*January 18, 2008*

**social studies**

Where do most Ancient Egyptian work?
*December 3, 2007*

**contemporary buisness communications**

for what audience or readership do you think the article "blogs will change your business" was written? what is the purpose of the article (to entertain, inform, persuade, or a combination)? explain answer how do the writers organize information in the article? what ...
*November 13, 2007*

**math**

75DEGREES= 30DEGREES+25DEGREES FIND THE SIN, COSINE, AND TANGENT
*April 2, 2007*

**English**

Does anyone have the superior knowledge as to where I could find an easy read translation of Romeo and Juliet for no price at all on the Internet?? Thank you for your valuable time and wonderful guiness. you could just read spark notes summaries Thank you for using the Jiskha ...
*February 22, 2007*

**Algebra I**

What is 194 times 10 to the third power written in scientific notation??? Please I am in tears trying to figure this out
*February 1, 2007*

**science**

I am doing the EXACT same homework x i need at least 3 or 4 physical &+ Chemical changes :s I dont get it !!!! x PLEASE HELP !
*October 20, 2006*

**BIOLOGY**

A SALT IS OBTAINED AS A REACTION BETWEEN A SALT (and water) IS OBTAINED AS A REACTION BETWEEN a base and an acid. See: http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/acidbase.html http://lrs.ed.uiuc.edu/students/erlinger/water/background/ph.html I hope this helps. Thanks ...
*September 30, 2006*

**making dot arrays**

What do u call a the nubers that cannot be arranged be a 2-ray array???? I need help plz!! =(
*August 21, 2006*