Saturday

April 30, 2016
Total # Posts: 290

**Chemistry**

If a student used an iron scoopula, instead of a plastic one, to add the unknown metal to the HCl solution, will it affect the calculated molar mass of the unknown metal? If so, how? Justify your answer with an explanation.
*September 23, 2013*

**Chemistry**

Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Justify your answer with an explanation.
*September 23, 2013*

**math**

Thank you.
*September 16, 2013*

**math**

George wants to build a square fence using 80 meters of wire. What is the area of the fence if you use all of the wire equally among each side?
*September 16, 2013*

**Algebra I**

The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers. Please help. ^.^
*September 9, 2013*

**Algebra I**

Find a number that is 96 greater than its opposite.
*September 9, 2013*

**algebra**

determine the equation of the line through the points (8,2) and (-4,-1) Please explain and show work
*May 23, 2013*

**Trigonometry**

Given that sin alpha = 15/17 and -360 <alpha<360 find all values of alpha to two decimal places. Help Please!
*May 18, 2013*

**HISTORY**

Good point. Thank You.
*May 14, 2013*

**HISTORY**

Necessary for all the countries that took part. Like America, Germany, Great Britain
*May 14, 2013*

**HISTORY**

Was imperialism necessary in the 19th century?
*May 14, 2013*

**Math **

Factorise fully: 5pq + 10p
*April 9, 2013*

**median and mode**

What is the median of this set of numbers 85,48,75,36,55
*April 4, 2013*

**physics**

A student throws two beanbags in the air, one straight up and the other one at a 30° angle from the vertical. Both beanbags are thrown with the same initial velocity and from the same height. In your own words, explain which one will come back and hit the ground first and ...
*March 11, 2013*

**Poetry??**

Read the following excerpt from “and sometimes i hear this song in my head.” "and our tongues keep remembering the rhythm of the words we forgot swaying on the backs of buses and in hot kitchens crooning in pool halls and shared bathrooms yeah/we carving a ...
*March 5, 2013*

**Physical Science Help!**

Can someone please help me balance these equations? Thank you for your time!! 1. NO + O2 ¨ NO2 2. NH4Cl + Ca(OH)2 ¨ CaCl2 + NH3 + H2O
*February 11, 2013*

**Please help with Physical Science 2!! Confused!**

Complete the following table by replacing question marks with the correct numbers: (Note: Each horizontal row is a separate example, so in row #1, 175.32 grams of NaCl is how many moles of NaCl and how many molecules of NaCl does it contain?) Grams NaCl Moles NaCl # Molecules ...
*February 5, 2013*

**Economics**

Which of the following is a characteristic of a traditional economy? A. It encourages innovation and change. B. It is usually based on light industrial production. C. It has a high standard of living. D. It revolves around the family unit.
*December 6, 2012*

**university physics**

Derive absolute error in equations: 1)Derive absolute error in (e/m) e/m= 2V/B^2*R^2 2)Derive absolute error in B B=8uN(Inet)/square root 125a
*November 21, 2012*

**university physics**

A platinum resistance thermometer has resistances of 200.0 ohms when placed in a 0 degrees Celsius ice bath and 253.8 ohms when immersed in a crucible contacting melting potassium. What is the melting point of potassium? Hint: First determine the resistance of the platinum ...
*November 20, 2012*

**science**

dome
*November 19, 2012*

**Math**

IDK somebody help
*November 19, 2012*

**physics, help! urgent!**

A positive point charge q = +2.50 nC is located at x = 1.20 m and a negative charge of ƒ{2q = ƒ{5.00 nC is located at the origin. (a) Sketch the electric potential verses x for points on the x-axis in the range -1.50 m < x < 1.50 m. (b) Find a symbolic ...
*November 14, 2012*

**physics, help!!**

A metallic sphere initially has a net charge of +4.0 nC. A negatively-charged rod initially has a net charge of –6.0 nC. When the rod touches the sphere 8.2 x109 electrons are transferred to the sphere. What is the new net charge on the sphere?
*November 9, 2012*

**physics**

Three point charges, A=2.00 uC, B=7.00 uC, C=-4.00 uC, are located at the corners of an equilateral triangle. a) Find the magnitude and direction of the electric field position of the 2.00 uC charge. b) How would the eletric field be affected if the charge there were doubled. ...
*November 7, 2012*

**english 11**

example of situation irony in act iii of the crucible
*October 19, 2012*

**math**

I don't know
*October 2, 2012*

**algebra**

f the principal P = $500, the interest I = $250, and the rate r = 10%, find the following. (a) What is the time?
*September 3, 2012*

**9th grade algebra/Ms Sue**

-7p-7,over 10 =-5 ?
*August 22, 2012*

**geography**

I'm pretty sure it's China.
*August 21, 2012*

**Medical termanology**

Give me a example of how to write the report.
*August 19, 2012*

**Medical termanology**

Write a fictitious medical report of about two paragraphs describing a dermatologic condition or disease. Focus the report on the onset,progression,location,and etiology of the condition or disease and the treatment parameters.
*August 19, 2012*

**algebra**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. 36 said they drove alone. 31 rode in a carpool. 32 rode public transportation. 6 used both carpools and public transportation. 7 used both a carpool and sometimes ...
*August 11, 2012*

**6th Grade Math: Proportions**

Hi! The answer is 10.68 when you round to the nearest hundredth but I'm not sure what the exact answer is. I hope this helps.
*August 8, 2012*

**Math**

out of these variables which would and would not follow normal distribution. shoe size height age GPA model year of car how many friends on face book Please explain why..thanks
*June 9, 2012*

**track and field**

lkggujjhvyjjmhmjhvhjcv
*May 12, 2012*

**math**

Write and solve the differential equation that models the verbal statement. Using k for the constant of proportionality The rate of change of N with respect to s is proportional to 626 − s. dN/ds= N=
*April 30, 2012*

**government**

According to the doctrine of judicial restraint, the judiciary should?
*April 25, 2012*

**Alegbra**

I am trying to factor, but I can't seem to get this one. The question is: -15d*2*-2d+8. It is actually -15d squared but I didn't know how to right that without it being confusing. Anyways I changed it so now it says -1(15d-2d+8). Then I drew a diagram using the factors...
*April 24, 2012*

**Chemistry**

What will be the effect on a chromatogram of two well separated peaks if: (this is for a gas chromatography) a) the carrier gas flow is set too high? b) the temperature of the injection port is set too low? c) the temperature of the column is set too high?
*April 3, 2012*

**Chemistry**

If the gas chromatograph is polar, and a mixture of a polar compound and a non-polar compound is injected. Which one of the two compounds will have a higher retention time? Why?
*April 3, 2012*

**chemistry**

What will be the effect on a chromatogram of two well separated peaks if: (this is for a gas chromatography) a) the carrier gas flow is set too high? b) the temperature of the injection port is set too low? c) the temperature of the column is set too high?
*April 3, 2012*

**Geography **

Can someone check these for me? 1.What problem has been at the heart of the intense political struggles in Central America? Unequal distribution of usable land is the heart of the political struggle. There is a shortage of farmland in order to meet the needs of everyone. ...
*March 23, 2012*

**Chemistry **

What is the balanced equation for the reaction of acetylsalicylic acid and sodium hydroxide?
*March 20, 2012*

**Algebra 1**

Write an equation of a line that passes through (-12, -14) with slope 6. A.y = 6x - 12 B.(y + 14) = 6(x + 12) C.(y + 12) = 14(x + 6) I've tried so many different ways to find this answer but can't. Please help me and please show me how you got it. I don't want you ...
*March 13, 2012*

**English 1 **

1.Writers often communicate their themes by building clues into the story. Choose one story from Collection 4 and show how the author uses characterization, title choice, and key passages to develop the theme of the story. Use examples from the story, including quotes from the...
*March 12, 2012*

**English 1 Literature**

I understand what the question is asking for but I do not know exactly how to write it. Here is the question. The way a story is told and the voice that tells it are important parts of a story. Choose at least two stories from Collection 3. Analyze the role that the narrator ...
*March 12, 2012*

**Chemistry**

It is possible, although less accurate, to do a standard addition with only one sample. An unknown Fe sample was analyzed by AAS and gave an absorbance reading of 0.160. To the same sample we added 1.5ppm Fe and the new absorbance reading was 0.205. Calculate the ppm of the ...
*March 5, 2012*

**chemistry**

One purpose of adding KIO4 is to prevent the permanganate ion from being slowly reduced to Mn+2 by H2O. Write a balanced redox equation for the reduction of permanganate ion to Mn+2 by water in acid solution.
*February 23, 2012*

**Chemistry**

There is a large [Cr2O7]-2 absorbance observed at 360 nm. Why can this wavelength not be used instead of the smaller absorbance at 440 nm?
*February 23, 2012*

**ChemistryDrBob222 could you please check this over**

0.281g of Fe(NH4)2(SO4)2*6H2O is dissolved in a total volume of 500.0 mL of water, calculate the resulting Fe concentration in ppm. molar mass of Fe(NH4)2(SO4)2*6H2O = 392.14088g/mol molar mass of Fe = 55.845g/mol 0.281g * (1mol/392.14088g) = 7.165X10^-4 mol 7.165X10^-4 mol...
*February 13, 2012*

**Algebra**

Krystal grilled 21 burgers at a block party. She grilled the same number of pounds of turkey burgers as hamburgers. Each turkey burger weighed 1/4 pounds and each hamburger weighed 1/3 pound. How many of each did Krystal grill? ~Please help me and provide an explanation for ...
*January 19, 2012*

**HELP PLEASE! (Math)**

Krystal grilled 21 burgers at a block party. She grilled the same number of pounds of turkey burgers as hamburgers. Each turkey burger weighed 1/4 punds and each hamburger weighed 1/3 pound. How many of each did Krystal grill? ~Please help me and provide an explanation for ...
*January 19, 2012*

**I NEED HELP :(**

Okay thank you! I understand now!
*January 18, 2012*

**I NEED HELP :(**

Mr. Malone is putting money in two savings accounts. Account A started with $200 and Account B started with $300. Mr. Malone deposits $15 in Account A and $10 in Account B each month. In how many months will the accounts have the same balance? What will that balance be?
*January 18, 2012*

**Algebra**

Mr. Malone is putting money in two savings accounts. Account A started with $200 and Account B started with $300. Mr. Malone deposits $15 in Account A and $10 in Account B each moth. In how many months will the accounts have the same balance? What will that balance be?
*January 18, 2012*

**Math**

Mr. Malone is putting money in two savings accounts. Account A started with $200 and Account B started with $300. Mr. Malone deposits $15 in Account A and $10 in Account B each moth. In how many months will the accounts have the same balance? What will that balance be?
*January 18, 2012*

**Math Homework**

A car dealer carries out the following calculations. What is the annual percentage rate? (Round your answer to the nearest tenth.) List price $ 5,368.00 Options $ 1,625.00 Destination charges $ 200.00 Subtotal $ 7,193.00 Tax $ 431.58 Less trade-in $ 2,932.00 Amount to be ...
*October 30, 2011*

**algebra**

Assume f(x) = x2 + 2. Find the functional value requested.
*October 22, 2011*

**math**

$21
*October 18, 2011*

**chemistry**

what mass of water can be heated from 45 celcius to 88 celcius with 28kj?
*October 11, 2011*

**chemistry**

what mass of water can be heated from 45 celcius to 88 celcius with 28kj?
*October 11, 2011*

**geometry**

10. Exactly how many cubic inches of air can a fully inflated basketball hold if its radius is 4.8 inches
*October 9, 2011*

**math**

540 kg of dry concrete mixture is to be spread over three surfaces in the ratio equal to that of their areas.If their areas are 9 square m,11 square m and 16 square m,how much is used on each surface?
*October 2, 2011*

**math**

lim (2x^2+3x-2)/ (2x-1) the lim is x->1/2 [ans:5/2 but i get 3/2) can someone show me the calculation work.
*July 20, 2011*

**math**

lim (7-6x^5)/(x+3).... the lim is x->+infinity [ans=-infinity but i get 0] can someone show me the calculation work.
*July 20, 2011*

**math**

f'(x).... y=(e^x-e^-x)/(e^x+e^-x). I need the calculation work. [ans: 4/(e^x+e^-x)^2]
*July 20, 2011*

**chem**

a mixture of 50g of S & 1x10^2g of Cl2 reacts completely to form S2Cl2 &SCl2. Find the mass of S2Cl2 formed.
*July 20, 2011*

**Physics**

7.685
*June 30, 2011*

**Chemistry**

An electron ps from the 6th to te 3rd energy level in the hydrogen atom: a) calculate the wavelength b) calculate the frequency c) calculate te enrgy d) into which spectral series would the photon be grouped? (i really just need to formulas, then i could solve myself...)
*May 23, 2011*

**Managerial Accounting**

true
*May 13, 2011*

**URGENT - History**

I tried that!
*May 11, 2011*

**URGENT - History**

Hi, Okay, so where can I get other cartoons on Stalin? I was searching like forever to find that one. Thanks for all your help
*May 11, 2011*

**URGENT - history**

Based on what you know do you think I should reference it as from Getty Images, or should I ditch it and try to find another one?
*May 10, 2011*

**URGENT - history**

Heya The Cartoon on Getty Images, Cosy Communist circa 1940. I'm trying to find where it was originally published and who originally drew it so that I can put that in my research journal. We are graded on our research journal and it documents like all our research. I need ...
*May 10, 2011*

**math**

what are the factors of 22x^2+66x-220?
*May 1, 2011*

**algebra**

Stacey throws two dice. The difference in face value between the two dice is three, and the product of the numbers thrown is equal to twice the sum of the two numbers. Show and solve an alebraic equation that finds the numbers Stacey threw.
*April 27, 2011*

**US History**

The cold war/red scare.
*April 24, 2011*

**Maths**

Hey! Okay so when the weather reporters say that ?mm of rain fell over night, they're talking about mm cubed aren't they? So while I was working out what to cube root to find out the ?mm of rain that fell overnight, I called it Rainfall mm. So what could I call the ?mm...
*April 24, 2011*

**maths**

how do you do taking away fractions like for eg 2 1/5 take away 1/10
*March 31, 2011*

**chemistry**

a liquid has an enthalpy of vaporization of 30.8 kg.mol. at 273 K it has a vapor pressure of 102 mmHg. What is the normal boiling point of this liquid
*February 17, 2011*

**chemistry**

a liquid has an enthalpy of vaporization of 30.8 kg.mol. at 273 K it has a vapor pressure of 102 mmHg. What is the normal boiling point of this liquid
*February 17, 2011*

**Modern World Studies**

i thought 1 was Romanticism?
*February 10, 2011*

**algebra**

write a quadratic equation in the variable x having given the numbers as sollutions type the equation in standard form ax^2+bx+c=0. solution 4 only solution
*February 8, 2011*

**Math**

Actually, Maybe I've got it. Is it 100(700)+20000=90,000 It will cost $90,000 to make 700 items.
*February 1, 2011*

**Math**

The Mathematical model C(x)=100x+20,000 represents the cost in dollars a company has in manufacturing x item during a month. Base on this, how much it does it cost to produce 700 item? Sorry, I did not put the whole question up
*February 1, 2011*

**Math**

How do I solve this? I don't even know where to begin.
*February 1, 2011*

**Math**

The Mathematical model C(x)=100x+20,000 represents the cost in dollars a company has in manufacturing x item during a month.
*February 1, 2011*

**economics**

yes
*January 26, 2011*

**chemistry**

I need to find out which structure is more correct: Reaction of the compound C3H8O with CrO3 (oxidizing agent) yields acetone. Which of the three structures is more correct? (My three structures are as follows: 1-propanol, 2-propanol, and methylethyl ether.)
*January 18, 2011*

**algebra**

provide me with a radical expression to simplify
*January 17, 2011*

**algebra**

Mike would like to plant some trees so he needs to use a portion of his existing yard. The perimeter of this rectangular portion needs to be 14 yards and the diagonal is 5 yards. Can you help Mike determine the length and width of this new portion? Mike requested that you show...
*January 16, 2011*

**English**

As she flipped through the newspapers, she saw headlines such as "Food shortages hit Mitika," "Hurricane departs coastline," and "Elkwood ravaged by flooding." Is my apostrophe and comma usage correct? Newspaper headlines are supposed to be ...
*October 17, 2010*

**algebra**

the value is 49, not sure what there asking for in the second part, unless it's just asking you to show your steps.
*October 14, 2010*

**algebra**

0.0025934041088830740483370627371053
*October 14, 2010*

**Chemistry**

1st one is right, the second one cant be right because there is no H on the left side.
*October 14, 2010*

**Math**

x+1 - x+2 = ? --- --- 2x-8 12-3x
*October 3, 2010*