Sunday

July 24, 2016
Total # Posts: 1,037

**Chemistry**

What is the pH of a 2.5 x 10-2 M HCl solution? I'm so confused how to find this :(
*April 24, 2012*

**chem**

A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?
*April 19, 2012*

**Physical Science**

The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?
*April 19, 2012*

**calculus**

what is the linear approximation of f(x)=x^3-x at x=2
*April 19, 2012*

**chem**

what is the ph of a solution that results from adding 30 mL of .015M KOH to 50 mL of .015 M benzoic acid?
*April 17, 2012*

**Geology**

Granite age for Scottish highlands
*April 16, 2012*

**English**

how has the world changed for the better? besides technology & medicine
*April 15, 2012*

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation
*April 5, 2012*

**American Government**

Who has to run for re-elecition every two years?
*March 27, 2012*

**Social studies**

Why would the Chinese want to limit population growth?
*March 25, 2012*

**chemistry**

Given that [O3]=4.0× 10–4 M and [NO]=3.0× 10–5 M at t=0, calculate the rate of the reaction at t=0.
*March 23, 2012*

**math**

1) Why should we clear fractions when solving linear equations and inequalities? Demonstrate how this is done with an example. Why should we clear decimals when solving linear equations and inequalities? Demonstrate how this is done with an example.
*March 21, 2012*

**History**

Little Richard, Chuck Berry, Fats Domino, Frankie Lymon and... Martin Luther King?
*March 18, 2012*

**algebra**

X*(x+10)=880ft X square=870 ft u find the square root of 870 and plug it in to the first equation
*March 17, 2012*

**chemistry**

Calculate the number of grams of h2c2o4.2h2o needed to prepare exactly 250mL of a 0.200 N solution of the acid?
*March 16, 2012*

**algebra**

Make a function table for each function. The cost of 1 to 5 books at $2. 95 each.
*March 13, 2012*

**Math - HELP !**

turn 62% into a fraction which is then .62 then mulitply 50 by.62 and you get 31 and that is your answer
*March 10, 2012*

**physics**

Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1820 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 83.0 kg, and the vine is 11.0 ...
*March 10, 2012*

**English-Poetry**

What does riprap symbolize in Gary Snyder’s poem, “Riprap”? A.the barriers of friendship B.the needless walls we build around ourselves C.the journey and the workmanship of the trail of life D.the things we bother ourselves with in life I think the answer is C...
*March 9, 2012*

**physics**

I did that and I am still getting the wrong answers, do I have to convert anything?
*March 9, 2012*

**physics**

A satellite is in circular orbit above the Earth at an altitude of 2000 km. What is the orbital speed of the satellite? what is the equation i need to use
*March 9, 2012*

**Poetry**

What does riprap symbolize in Gary Snyder’s poem, “Riprap”? A.the barriers of friendship B.the needless walls we build around ourselves C.the journey and the workmanship of the trail of life D.the things we bother ourselves with in life I think the answer is C, ...
*March 8, 2012*

**PHYSICS**

A wet bar of soap slides freely down a ramp 12.0 m long, inclined at 74.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)
*March 7, 2012*

**13**

the answer is C
*March 4, 2012*

**Chemistry**

What amount of hydrogen peroxide should result when 1.21 g of barium peroxide is treated with 25.1 mL of hydrochloric acid solution containing 0.0289 g of HCl per mL?
*February 29, 2012*

**Math**

5e+15p</=60 How many combinations of excersises (e) and problems (p)can you do in exactly one hour(60 minutes)? I've found 5 combinations: 9e,1p 3e,3p 6e,2p 0e,4p, 12e,0p Are there anymore? What method would you use to solve this type of problem? Thanks for the help!
*February 25, 2012*

**Statistics**

Problem 1. Three supermarket chains in the Denver area each claim to have the lowest overall prices. As part of an investigative study on supermarket advertising, the Denver Daily News conducted a study. First, a random sample of nine grocery items was selected. Next, the ...
*February 25, 2012*

**English-please help!**

You don't need to remeber the whole story, just ascertain answers from the given text, I'm sure.
*February 21, 2012*

**English-please help!**

It must be nice," she said. "It must be very nice. I wish women could do such things." "It ain't the right kind of a life for a woman. Her upper lip raised a little, showing her teeth. "How do you know? How can you tell?" she said. "I don...
*February 21, 2012*

**English**

Please help. My answers are the ones with a (*) next to them. I'd like to get this assignment done tonight :)
*February 20, 2012*

**English**

I put an asterixs (*) next to my answers. I want someone to double-check, not do my work for me :)
*February 20, 2012*

**English**

It must be nice," she said. "It must be very nice. I wish women could do such things." "It ain't the right kind of a life for a woman. Her upper lip raised a little, showing her teeth. "How do you know? How can you tell?" she said. "I don...
*February 20, 2012*

**Statistics homework distribution problem? **

i need help with how to solve this: consider a normal distribution with mean 30 and standard deviation 2. what is the probability a value selected at random from this distribution is greater than 30? the book gives me the answer but i need to know how to solve it. please help?
*February 20, 2012*

**math**

How can you use subtraction to complete an addition pattern? use this exercise as an example: 32, 39, 46, 53, 60, 67.
*February 19, 2012*

**English**

Identify the participial phrase in the sentence below. Rising early, I saw the sun come up. A.Rising early B. saw the sun C. come up D. in the distance Thanks for the help :)
*February 19, 2012*

**math**

In 1920, the record for a certain race was 45.5 sec. In 1970, It was 44.5 sec. Let R(t)=the record in the race and t=the number of years since 1920 Predict the record for 2003 and 2006
*February 18, 2012*

**Chemistry**

17.6 mL
*February 17, 2012*

**Physical science**

Is it possible for an object to have more kinetic energy but less momentum than the other object? Less kinetic energy but more momentum? *i know the answer to both questions is yes, however, i cannot think of examples ??
*February 11, 2012*

**College Algebra**

Solve the problem. Jon has 1162 points in his math class. He must have 86% of the 1500 points possible by the end of the term to receive credit for the class. What is the minimum number of additional points he must earn by the end of the term to receive credit for the class?
*February 10, 2012*

**English-Metaphors**

So what do you think the answer is? I'm starting to think it may be a.
*February 8, 2012*

**English-Metaphors**

Which of the following excerpts from Frost's poems is NOT a metaphor? A.Magnified apples appear and disappear / Stem end and blossom end B.Spring is the mischief in me C.My apple trees will never get across / And eat the cones under his pines, I tell him. D. Give the ...
*February 8, 2012*

**intermediate algebra**

A triangle is such that the largest angle is 11 times the smallest angle. The third angle is 27° less than the largest angle. Find the measure of each angle. (Enter solutions from smallest to largest.)
*February 5, 2012*

**intermediate algebra**

Two complementary angles are such that one is eight times larger than the other. Find the two angles.
*February 4, 2012*

**College algebra**

use interval notation to express the solution set of the inequality |2x + 3|> or equal to 9
*February 1, 2012*

**Physical Science**

A man has a mass of 70 kg. A) What would his weight be on Jupiter which as an acceleration of gravity of 25m/s^2? B) What would the mass of a person have to be in order for him to weigh that amount on earth?
*February 1, 2012*

**Physical Science**

A force of 20 Newtons gives a brick an acceleration of 5 m/s^2. What is the mass of the brick?
*February 1, 2012*

**Math**

Okay, thank you!!
*January 31, 2012*

**Math**

So ½ would just be a decimal?
*January 31, 2012*

**Math**

Please match each number with its best example. Some values will need to be changed into a decimal format. A. Recurring Decimal B. Mixed Number C. Non-repeating Decimal D. Finite Decimal E. Decimal Examples: ½ 5½ π 0.375 ⅓ I think 5½ is B and &#...
*January 31, 2012*

**Psychology**

Can someone please explain the exotic becomes erotic theory by daryl bem, i have read it but i cant understand what its really saying thank you
*January 23, 2012*

**Psychology**

I was assigned a topic nature vs nurture: are children born gay or evolved into,,,,i would appreciate if anyone knows of any book sources that can help me and any secondary source because i dont know where to start thank you in advance
*January 23, 2012*

**English**

I say shes welcoming people the europeans about the new world im not sure of i guess something different
*January 12, 2012*

**English**

Can someone help me with this poem, the question is how is the new world being portrayed and i do not know: Not like the brazen giant of Greek fame, With conquering limbs astride from land to land; Here at our sea-washed, sunset gates shall stand A mighty woman with a torch, ...
*January 12, 2012*

**To Annie: Re: Penn Foster**

Don't worry Annie, Ms. Sue is obviously a cun+.-apparently she needs to get laid or something
*December 28, 2011*

**Volume of a solid - calculus**

Find the volume of the solid generated by revolving the region bounded by the curves: y=2 Sqrt(x), y=4, x=0 about the x-axis
*December 8, 2011*

**calculus**

Find the volume of the solid generated by revolving the region delimited by 5x+5y=40, y=0, and x=0 about the x-axis.
*December 8, 2011*

**math**

If the government finances $184 billion worth of 20 year old bonds at a fixed rate of 1.8% compounded quarterly , how much will it have to pay back when the bonds mature?
*December 4, 2011*

**la serra hs**

population of N = 10 scores has a mean of μ = 80. If 5 points are added to every score in the distribution, what is the value of the new mean
*November 27, 2011*

**Chemistry**

What is the mass, in grams, of NaCl formed from the reaction of 2.75 mL of a 6.00 M Na2SO4 solution and 8.30 mL of 2.5 M solution of HCl?
*November 23, 2011*

**Chem**

The electrochemical cell described by the balanced chemical equation has a standard emf of -0.25 V. Calculate the value (kJ) for the ΔG˚ of the cell. Round your answer to 3 significant figures. MnO2(s) + Pb2+(aq) → Mn2+(aq) + PbO2(s) St. Red. Pot. (V) PbO2/Pb2...
*November 14, 2011*

**Chem**

The galvanic cell described by the cell notation has a standard emf (electromotive force) of 4.05 V. Calculate the value (kJ) for the ΔG˚ of the cell. Round your answer to 3 significant figures. Mn(s) l Mn2+(aq) ll F2(g) l F-(aq) l Pt(s) St. Red. Pot. (V) Mn2+/Mn -1....
*November 14, 2011*

**calculus**

1/sqrt(x^2 - 4)
*November 9, 2011*

**Chemistry**

Calculate the amount of heat in kcal it would take to convert 1.45 mol of ice at 0 degrees C to steam at 100 degrees C.
*November 1, 2011*

**chemistry**

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + H2O(l) ¨ Ca(OH)2(s) In a particular experiment, a 2.00-g sample of CaO is reacted with excess water and 2.14 g of Ca(OH)2 is recovered. What is the percent yield in this ...
*October 26, 2011*

**grammar**

Underline the singular noun in each sentence, then write the plural form of the word you underlined. The sentence is the following. They are planning several projects for the year ahead.
*October 20, 2011*

**calculus**

A chain saw requires 2 hours of assembly and a wood chipper 5 hours. A maximum of 20 hours of assembly time is available. The profit is 150 on a chain saw and 230 on a chipper. How many of each should be assembled for maximum profit.
*October 17, 2011*

**alg2/trig**

The expression a/a-b + b/b-a is equivalent to a) 1 b)-1 c) ab/a-b d)a+b/a^2-b^2 please help!
*October 13, 2011*

**Math**

Its good 120×75 is going to equal 9,000
*October 12, 2011*

**College Chemistry**

300.15 mL
*October 6, 2011*

**holley redemer**

restate the sentence Annually, millions of animals suffer and die in painful tests in order to determine the safety of cosmetics.
*October 5, 2011*

**Chemistry**

What type of chemical reaction is involved in the breakdown of large molecules, such as those found in food,into smaller molecules? i think it might be Catabolism, but im not sure
*October 2, 2011*

**chem**

909 mol of C2H3Cl
*October 1, 2011*

**english**

Rewrite each run or sentence as two sentences or a compound sentence using and, but , or or. 1. Most fish are about a foot long some fish are giants.
*September 29, 2011*

**chem**

2.7 per cubic meter squared
*September 24, 2011*

**chemistry**

If a solution containing 0.22 M Cl -, Br -, I -, and CrO42- is treated with Ag+, in what order will the anions precipitate?
*September 23, 2011*

**Chemistry-help**

Hi, I have a question on Gas Chromatography(GC). The following were injected into the GC system: - 1) 1% sample solution in acetone 2) a 500 times dilution of item 1) The retention time of the main peak in the diluted sample solution 2) shifted by ~ 2min. The expected area ...
*September 19, 2011*

**Chemistry**

Convert 19.0cm cubed to meters cubed?
*September 19, 2011*

**Chemistry**

Chloroform is a liquid that is not soluble in water. It has a density of 1.498g/mL. Astudent mixed a sample of chloroform and a sample water and observed the result. Sketch what the student saw, and identify all components of the drawing. for a container, draw a test tube.
*September 19, 2011*

**Chemistry**

A 50.0mL sample of ethylene glycol had a mass of 55.505g. Find the density of ethylene glycol.
*September 19, 2011*

**maths**

an aeroplane flying at 600 km travels for 3 hours on a bearing of 310T how far north and how far wesr is it from its starting point after 3 hours
*September 19, 2011*

**Chemistry-please help**

Hi, I have a queestion on Gas Chromatography(GC). The following were injected into the GC systemk: - 1) 1% sample solution in acetone 2) a 500 times dilution of item 1) The retention time of the main peak in the diluted sample solution 2) shifted by ~ 2min. The expected area ...
*September 18, 2011*

**chemistry**

write the balanced chemical equation for the reaction that occurs when water is added to anhydrous BaCl2. would it be BaCl2+2H2o --> BaCl2+2H2O
*September 11, 2011*

**chemistry**

write the balanced chemical equation for the reaction that occurs when BaCl2.2H2O is heated.
*September 11, 2011*

**Algebra**

Solve the equation and check your answer (q+9)/5 + (q-2)/2 = 11/5
*September 11, 2011*

**Math - Calculus**

I do believe that all the denominators need to be the same to see the pattern. 2/3 is the same as 10/15 so the pattern looks like 10/15, 1/15, -8/15. Subtracting 9 from the top set of #'s
*September 11, 2011*

**math**

[-8+(-1)]+[8+(-6)]+(-6) Am I doing this right? I think I'm confusing myself please help... I have: [-8-1]+[8-6]-6 [-9]+[-2]-6 -11-6=-17
*September 9, 2011*

**math**

Thank you very much you have been great help!
*September 8, 2011*

**math**

My answer comes out to 0.141428571 and so on....what exactly is my answer do I need to round off or anything?
*September 8, 2011*

**math**

If a bag of chips has a serving size of 1 oz.(28g/about 32 chips), and serving per container is 7. So if the bag of chips costs 0.99, approximately how much does one serving of chips cost? Would I start out by 99/7? help!
*September 8, 2011*

**Math**

If a bag of chips has a serving size of 1 oz. and serving per container is 7. If the bag of chips costs 0.99, approximately how much does one serving of chips cost? would I start out by 99/7
*September 8, 2011*

**Math**

is this correct I2*100+3*10I= I200+30I=I230I
*September 8, 2011*

**English **

oh yeah thx that is true cuz Maleeka have low self esstem
*September 5, 2011*

**English **

thank you i was just making sure if that only theme
*September 5, 2011*

**English **

is bullying is the main theme for The Skin I'm In ??? if it not the only one then r they any other theme for it
*September 5, 2011*

**math**

We are learning inequalities and I just did some homework but the teacher returned it saying I did some of them wrong. 1. -2x - 10 < 2 2. -2x + 15 < 17 I didn't flip the inequality sign when I divided by (-2). But why do we always have to flip the sign when we ...
*September 4, 2011*

**science**

Just make an educated guess. how old are the old ones, how young are the young ones? It doesn't really matter what your hypothesis is, really. if you don't know the answer, you have to do an experiment to find out. that's the whole idea. PS. I don't think "...
*September 3, 2011*

**Simple math question!**

yep. if the question is 6-(2x)^3 then you need to cube 2x but in your question it's 6-2x^3 without the brackets so u only need to cube x.
*September 3, 2011*

**social **

Trust vs. mistrust (infancy)
*September 2, 2011*