Tuesday

August 4, 2015

August 4, 2015

Total # Posts: 771

**Chemistry**

Calculate the amount of water (in grams) that must be added to (a)5.00 g of urea (NH2)2CO in the preparation of a 16.2 percent by mass solution, and (b)26.2g of MgCl2 in the preparation of a 1.5 percent by mass solution.
*September 19, 2010*

**Chemistry**

Explain why ethanol is not soluble in cyclohexane. Also, how do you figure out whether something is polar or nonpolar?
*September 19, 2010*

**chemistry**

In the course of research, a chemist isolates a new compound with an empirical formula C3H3O2. 4.97 g of the compound when dissolved in 100. g of water produces a solution with a freezing point of −0.325°C. What is the molecular formula of the compound? (For water, ...
*September 8, 2010*

**Chemistry**

Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
*September 8, 2010*

**chemistry**

A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at −2.34°C. Calculate the molar mass (in units of g/mol) of the ascorbic acid. Kf of water is 1.86°C/m.
*September 8, 2010*

**chemistry**

What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?
*September 8, 2010*

**statistics**

heights of young adult u.s women are approximatelynormal with mean 64 inches and standard deviation 2.7 inches. What proportion of all u.s. young adult women are taller than 6 feet?
*September 7, 2010*

**Science**

Why do scientists use experimental design?
*September 7, 2010*

**math**

Complete the following ordered pairs for the equation. 4x+5y=-22(_, -2) (2, _)(7, _)
*August 24, 2010*

**college**

i need help to get started with this assignment?
*August 20, 2010*

**Business Communication**

So, is A the correct answer
*August 13, 2010*

**Business Managment**

Whats the correct answer B or D
*August 12, 2010*

**principles of chemistry**

i dont know the answer
*August 8, 2010*

**psych**

thanks again ms. sue! you're the best:)
*August 7, 2010*

**psych**

Can you tell me if I have this right? Are the major schools of psych? Structuralism, Behaviorism, Functionalism, Psychoanlysis, and Humanism? Just want to make sure I have the right ones. Thank you
*August 7, 2010*

**psych**

thank you once again!
*August 4, 2010*

**psych**

how does psych as a scientific discipline differ from casual observations we make in the world in everyday life? what are the similarities? Thanks
*August 4, 2010*

**Accounting**

o What are the advantages of the four different special journals? When would you use each type?
*July 29, 2010*

**college math**

A student makes a 10.50 purchase at the bookstore with a $20.00 bill. The store has no bills and gives the change in quarters and fifty-cent pieces. There are 30 coins in all. How many of each kind are there?
*July 29, 2010*

**college**

The preimeter of a retangle is 98. The length is 7m more than twice the width. Fid the dimension?
*July 29, 2010*

**math**

of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total comercial time during 1 hour is 13 min, how many 30-second commercials were played that hour? How many 60-second commercials?
*July 27, 2010*

**National Security policy**

What role should American's ideals play in it's National security policy history,current, hypothetical cases
*June 27, 2010*

**math**

1. Consider the following equation. xy + 7x + 5y = –8 (a) Differentiate both sides with respect to x to complete the following. ( blank )y ' + y + blank =0 (b)Solve for y ' in terms of x and y. (c) Calculate dy/dx at the point (4,-4). Can anyone help me on this ...
*June 21, 2010*

**Math**

Thank you!
*June 17, 2010*

**Math**

thank you, But what if the product is something other than -1 Could it still be perpendicular? Why or Why not?
*June 17, 2010*

**Math**

How can you determine if two lines are perpendicular?
*June 17, 2010*

**science**

First, watch the video, than decide which side you are are more inclined to. Either conservation or preservation, and tell why you chose the one you did. (defend your position)
*June 17, 2010*

**math**

No, in order to have a different number of marbles in each of the boxes you would need at least 55 marbles.
*June 17, 2010*

**Science (evolution)**

Thank you, they were helpful.
*June 17, 2010*

**Science (evolution)**

Well so far I found that fossils support his theory, also I have found that a fish study also supports this. I must find two with resources that support this. Although I have already found two, I was wondering if you or anyone else had any ideas?
*June 17, 2010*

**Science (evolution)**

Given Darwin’s Theory of Evolution, what scientific evidence best supports evolution by natural selection?
*June 17, 2010*

**Math**

Thank you again! :0)
*June 9, 2010*

**Math**

What is the difference between domain and range?
*June 9, 2010*

**Algebra**

Thank you.
*June 8, 2010*

**Math**

Thank you! :0)
*June 8, 2010*

**Math**

Thank you. Are there not any linear equations that do not have a slope? What would they be called?
*June 8, 2010*

**Math**

Are all linear equations functions? Why or why not?
*June 8, 2010*

**History**

its a question for a penn foster test ( early faces of western art )
*May 30, 2010*

**Algebra**

Thanks
*May 27, 2010*

**Algebra**

If you replace the equal sign of an equation and put an inequality sign in its place, is there ever a time when the same value will be a solution to both the equation and inequality?
*May 27, 2010*

**science**

what is it because i am in year 7 and if I do not have it I will get 1 hour det
*May 16, 2010*

**Philosophy**

I figured it out thanks anyway. =0)
*April 27, 2010*

**Philosophy**

My text explains the answer to this question, however I do not understand the answer. Instead of posting the entire text I was wondering if anyone could explain this to me in Laymans terms. Thanks. How did financial considerations and the international market affect the pre-...
*April 27, 2010*

**chemistry**

Thank you anonymous and DrBob222!
*April 27, 2010*

**chemistry**

What is the volume of 45.0g of nitrogen monoxide, NO, at 20 C and a pressure of 740 mm Hg? Please someone can check my work is right or not? NO = 14 + 16 = 30 54.0g / 30 = 33.60 L 273K/293K = 0.932 atm 740 mm Hg = 740 torr = 0.974 atm 33.60L x 0.932 x 0.974 = 30.50 L Answer; ...
*April 27, 2010*

**chemistry**

Thank you so much both of you. It really help me to understand. :)
*April 15, 2010*

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? 8NO2 (g) + 6NH3 (g) --> 7N2) (g) + 9H2O (g) IS this help? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*April 15, 2010*

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*April 15, 2010*

**chemistry**

Someone can help me please? A gas sample weighing 0.528 g is collected in a flask having a volume of 126 mL. At 75 degrees celcius the pressure of the gas is 750 torr. The molecular mass of the gas is closest to which one of the following? PV=nRT Thanks, DrBob222
*April 14, 2010*

**chemistry**

Someone can help me please? A gas sample weighing 0.528 g is collected in a flask having a volume of 126 mL. At 75 degrees celcius the pressure of the gas is 75 torr. The molecular mass of the gas is closest to which one of the following?
*April 14, 2010*

**chemistry 1**

it should be 2C4HO + 8O2 - > 8CO2 + H20
*March 7, 2010*

**CHEMiSTRY**

THANK YOU ! ( :
*March 7, 2010*

**CHEMiSTRY**

what is the relationship between the pressure of a gas and the absolute temperature when the volume is kept constant ?
*March 7, 2010*

**math**

3 + 13 = 16
*March 7, 2010*

**math**

pentagon * A pentagon has five sides .
*March 7, 2010*

**chemistryy**

thanks .
*March 7, 2010*

**chemistryy**

what is the relationship between the pressure of a gas and the absolute temperature when the volume is kept constant ?
*March 7, 2010*

**history**

What was the cause of the Panic of 1837? It means the same as too many people buying too much land with too little collateral.
*February 25, 2010*

**American Government**

if there is collision between the president and congress,can congress restain the president in foreign policy making?
*February 19, 2010*

**math**

do i have to multiply or divide?
*February 16, 2010*

**math**

sin 190 over 20 equals sin 47 over x.
*February 16, 2010*

**CHEMISTRY**

TO WHAT SPEED MUST AN ELECTRON BE ACCELERATED FOR IT TO HAVE A WAVELENGTH OF 3.0CM?
*February 10, 2010*

**Physics**

The answer is 4.00V
*February 5, 2010*

**medical office administration**

Acne is an example of a(n) A. papule. B. nodule. C. ulcer. D. vesicle. WOULD IT BE PAPULE?
*February 3, 2010*

**algebra**

how to rewrite the expression with positive exponents, please help, thank you.. (29xy)^-2/3
*January 27, 2010*

**algebra**

thanks bob, for all your help
*January 22, 2010*

**algebra**

the width of a rectangle is 1 ft less than the length, the area is 6 ft^2, what is the length and width? thank you
*January 22, 2010*

**math**

2X3
*January 20, 2010*

**algebra**

x^2-7x+3=0 1) exact solutions x=? 2) approx to 3 decimal places x=?
*January 20, 2010*

**Advanced Functions math**

Yes to get that i did: (5^x)^2 - 4(5^x) =12 5^x(1-4) = 12 -3(5^x)= 12 log(5^x) = log(-4) If you could show me the correct way to do it, that would be great! thanks!
*January 18, 2010*

**Advanced Functions math**

Could someone help me with this question? 5^(2x) - 4^(5^x) = 12 I got up to log (5^x)= log(-4) but it isnt correct since it can't be negative.
*January 18, 2010*

**Finance**

anthony bought a boat 3 years ago, and at that time he put a down payment of $25000 cash. today he made the second and final payment of $28 300, which includes the interest on the balance owing. anthony financed his purchase at 6.35%/a, compounded quarterly. determine the ...
*January 16, 2010*

**algebra**

write a quadratic equation having the given numbers as solutions. -4 and -1 thank you
*January 14, 2010*

**health care administration**

what is your view on health care
*January 13, 2010*

**Math **

Solve the equation for x in the interval 0<x<2pi 1/ 1+tan^2x = -cos x How would i do this? im thinking of maybe changing the 1+tan to sec^2x?
*January 11, 2010*

**Math-gr12**

how would i do that?
*January 11, 2010*

**Math-gr12**

How would I solve this equation for x in the interval 0<x<2pi tan^2x sinx - sinx/3 = 0 Please explain it step by step..ive been stuck on this question for far too long..sigh
*January 11, 2010*

**Trigonometry**

You use the double angle formulas.
*January 11, 2010*

**algebra**

write equivalent expression using radical notation (a^2b^2)^1/3
*January 6, 2010*

**government**

was ronald reagan considered strong or weak on foreign policy?
*December 31, 2009*

**DECIMALS**

write the appropriate numbers 1. add 15 parts of 0.01 2. add 9 parts of 0.01
*December 29, 2009*

**decimals**

add 3 parts of 0.1
*December 29, 2009*

**finance**

How much will Pauline pay in interest if she takes out a simple interest loan with a principal of $3,900 at 7.2% for three years?
*December 16, 2009*

**Math**

My cousin Robert was pushed into a pool. The pool was 6 feet Wide and 10 feet deep. The pool had soft walls. How did my Cousin Robert Emerge from the pool? Ans__________ Hint- We do not know if it's filled with water or not. It is a round pool. It is a ground pool.It has ...
*December 8, 2009*

**american**

Why do you think it was written in 1863(after two years of fighting in the Civil War)?
*November 18, 2009*

**antonyms**

lvht- love/ hate
*November 18, 2009*

**Algebra**

collect like terms 17a +6b-11a-9b= thanks
*November 13, 2009*

**Algebra**

translate to an algebraic expression, the product of 11% of some number
*November 11, 2009*

**Algebra**

find the indicated outputs f(x)=2x^2-3x f(0)=? f(-1)=? f(2)=? help?
*November 11, 2009*

**Algebra**

I need someone to refresh my brain on collecting like terms.. 17a + 6b - 11a - 9b= thank you
*November 10, 2009*

**history**

can you check this question Why did Napoleon invade Russia Napoleon invaded Russia because he wanted to complete his mastery of Europe.
*November 4, 2009*

**world history**

could you help me with this question Why did being a sea power help britain to survive an attack by the French?
*November 4, 2009*

**Algebra**

describe what the graph of interval [-4,10] looks like. thank you
*November 3, 2009*

**French**

Could you please check these Thanks you!!! Directions: Complétez Part 1 1. Au bord de la mer, on va à la ----------------. Answer: plage 2. Il faut mettre de la ---------- quand on prend un bain de soleil. Answer: créme solaire 3. Laure apprend à ...
*November 2, 2009*

**Algebra**

trouble with outputs.... Find the indecated outputs for f(x)=3x^2 - 5x f(0)=? f(-1)=? f(2)=? please help
*October 23, 2009*

**algebra**

The second angle of a triangle is three times as large as the first. The third angle is 20 degrees larger than the sum of the first two. What are the measures of the angles?
*October 22, 2009*

**Math **

There are no parenetheses
*October 20, 2009*

**Math **

im lost evaluate 30 divided by 5*3-2 all over/2-2divided by 3 Math - jim, Tuesday, October 20, 2009 at 5:39pm You 'll have to clarify that. Do you mean: 30 / (5*3-2)/ (2-2/3) ? Math - Diana, Tuesday, October 20, 2009 at 7:40pm no Ill try to write it out thirty divided by 5...
*October 20, 2009*

**Math **

thank you so much!
*October 20, 2009*

**Math **

I guess its a fraction sorry about typing these are the answers to chose from A)=0, B)= 2 1/4 C) undefined, D) -4 1/2 problem (-3)^3-9 then there is a line and under the line is 6/2*3-1
*October 20, 2009*