Friday

February 24, 2017
Total # Posts: 790

**Chemistry Check**

Determine the missing values of deltaH in the diagram shown below ^ | ^ N2O3(g) + 1/2 O2(g) (Enthalpy)| | ^ | | deltaH= +16.02 | | | | | | 2 NO2(g) | | | ^ | |deltaH=? | | | | | | deltaH=?| | | | | | | | N2(g)+202(g) | Answer: Delta H for the right= 66.36 Delta H for the left...

*October 18, 2014*

**Chemistry**

Please help! I don't understand these questions at all. :( Fe2O3(s) + 2Al(s) -> Al2O3(s) + 2Fe(l) If 0.50 mol of Fe is produced in 10 secs, what is the rate of consumption of Fe2O3 in mol/s? A. 5.0 x 10^-2 mol/s B. 2.5 x 10^-2 mol/s C. 1.0 x 10^-1mol/s D. 5.0 mol/s ...

*October 16, 2014*

**Language Arts**

What is the right answer, though? Ms.Sue is saying it is A, but Anonymous is saying it is D. Which is correct?

*October 15, 2014*

**chemistry**

An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together. A 1.148g sample of ...

*October 11, 2014*

**chemistry**

For the adiabetic expansion of an ideal gas a) does the gas do work? B) doesd the internal energy of the gas increase, decrease or remain constant? C) what happens to the temperature? Please check my answers A) yes the gas does work because it is expanding B) internal energy ...

*October 2, 2014*

**Math**

okay, I forgot to break down the equation, thank you.

*October 2, 2014*

**Math (Implicit Differention)**

I got the same answer as Brittany, I just want to make sure if it is correct or not

*October 2, 2014*

**Math (Implicit Differention)**

The problem is (x^(2/3))+(y^(2/3))=4 I'm confused on the answer

*October 2, 2014*

**Math (Implicit Differention)**

use implicit differentiation to find the slope of the tangent line to the curve of x^2/3+y^2/3=4 at the point (-1,3sqrt3)

*October 2, 2014*

**Rodriguez**

use implicit differentiation to find the slope of the tangent line to the curve of x^2/3+y^2/3=4 at the point (-1,3sqrt3)

*October 2, 2014*

**chemistry**

state the separation technique for silver choride and sodium trioxonitrate

*October 1, 2014*

**chemistry**

I re balanced but still not getting the right answer 2naclo + h2o = 2 Na + 2oh + cl2+ 1/2o2

*September 30, 2014*

**chemistry**

Also, when i inputed .0066mol O2 into pv=nrt to get volume, i ended up witj 161.5L. I don't know what im/doing wrong...

*September 30, 2014*

**chemistry**

I had done the same process previously but my teacher's answer is 74.9mL...do you know any other way to work it out?

*September 30, 2014*

**chemistry**

Household bleach contains (NaClO)2 that decomposes in water, NaClO + h2o = Na+ + OH- + Cl2 + O2 If 15ml bleach containing 5.85℅ NaClO is allowed to decomposes completely, then hoe many mL of o2 at 22C and 755mmHg can be liberated. Density of bleach= 1.12g/ml Answer I ...

*September 30, 2014*

**Chemistry- Answer Check**

In an ideal gas, if only one molecule in a thousand has enough energy to react, how can all molecules in a reactor be consumed? My answer: when the one molecule reacts, it causes the other molecules to gain energy. Is this right? I'm still confused on the question

*September 29, 2014*

**Chemistry: Please check my answer**

ClO2 is sometimes used as a chlorinating agent for water treatment. Cl2 + 4 NaClO -> 4 NaCl + 2 ClO2 In an experiment, 1L Cl2 measured at 10C and 4.66atm is dissolved in .75L of 2.00M NaClO. If 25.9g of pure ClO2 is obtained, then what is the percent yeild for this ...

*September 29, 2014*

**chemistry**

If someone has the time to help with the following question it would be really helpful. The problem is 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change in J/mol reactants? AMU amounts: Bi=208.980384 Ni= 63.927969 Rg=272.1535 What I have done is 1. subtract ...

*September 25, 2014*

**chemistry-repost**

Sorry to post this again, not sure if it was seen. If someone has the time to help with the following question it would be really helpful. Posted by Nancy on Monday, September 22, 2014 at 9:55am. The problem is 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change...

*September 22, 2014*

**chemistry**

The problem si 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change in J/mol reactants? AMU amounts: Bi=208.980384 Ni= 63.927969 Rg=272.1535 What I have done is 1. subtract products from reactants. 2. multiply the result by 1.66054x10^-27kg 3. multiply that by 8....

*September 22, 2014*

**Algebra I**

I need formula's for figuring out % problems. example 7 is what percent of 4 or %125 of what is 85? or 22.2% of 45 is ?

*September 11, 2014*

**Algebra I**

to determine whether a given number is a solution of an equation. Problem: Is 5 a solution of 10x-xto the 2nd power = 3x-10? my work: 10(5)-25=25 and 50-25=25 so x is not a solution. right or wrong? Im new at this

*September 9, 2014*

**MATH**

What is my number if the hundreds digit is less than the tens digit and less than the ones digit and the hundreds digit is even and the tends digit divided by the hundreds digit is 5 and the product of two of the digits is 6 and it has two odd digits and one if the digits is ...

*August 28, 2014*

**chemistry -repost**

Still can't figure this one out-- sorry for reposting, this is the last post, if someone has time to review this question and see if they can figure out how the textbook got 1.0x10^-7 seconds Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10...

*August 6, 2014*

**Qualitative analysis**

Computer sales over the past 4 months have been 35, 34, 38, and 44 units. Using a 3-month moving average, forecast sales for the next month. Using a 3-month weighted moving average with the weights 3, 2, and 1, and with the most weight on the most recent data, forecast the ...

*August 5, 2014*

**Chemistry**

Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form I2? This must use a ...

*August 4, 2014*

**chemistry**

Sorry it is 1.0x10^10 seconds. Any idea how to obtain this answer?

*August 4, 2014*

**chemistry**

Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form I2? This must use a ...

*August 4, 2014*

**studing to take an exam**

create a timeline that displays the development of abnormal psychology. include at least five to seven main milestones

*July 24, 2014*

**PSY/410**

am still waiting for my answer

*July 9, 2014*

**Algebra**

Helen invested $14,000 in an account that pays 3% simple interest. How much additional money must be invested in an account that pays 6% simple interest so that the average return on the two investments amounts to 4% ?

*June 12, 2014*

**algebra**

the plane travels with the wind at an average speed of 529 miles per hour and returns against the wind at an average speed of 408 miles per hour what is the distance it travels

*June 2, 2014*

**Chemistry**

Complete and balance the following (CH3)2NH(aq)+CH3COOH(aq)→ CH3CH2NH2(aq)+HBr(aq)→ CH3NH2(aq)+HCOOH(aq)→

*May 27, 2014*

**Physics**

Assuming zero drag, how long, in seconds, would it take a super ball to fall 25 feet? What would its velocity be at that point (in mph)?

*May 17, 2014*

**Adult Education**

Assuming zero drag, how long, in seconds, would it take a super ball to fall 25 feet? What would its velocity be at that point (in mph)?

*May 17, 2014*

**Math**

-3

*May 8, 2014*

**Math**

Solve: 5/6x -3=12

*April 27, 2014*

**Social Studies**

Actually, I just took the test, and the CORRECT answers are: (in order from 1 to 13) 1.D 2.A 3.C 4.C 5.C 6.B 7.A 8.A 9.B 10.C 11.C 12.C 13.D Hope this helps people! :)

*April 10, 2014*

**Social Studies**

Mr. Galve are all of these answers correct? As for Nicole, I am not sure. So the problem is, we need to figure out what answers are correct. Ms. Sue, are you positive that 5 and 12 are incorrect? And for Mr. Galve, are they all correct?

*April 10, 2014*

**math**

Mrs. Grace has 10 sandwiches that are 4 inches in diameter. They can fit exactly into a different box... Need to show work in box, help, can't seem to figure this out

*April 8, 2014*

**intermediate accounting**

in 2011 hardin company had 220000 shares $10 par common stock, march 1 issued 45000 shares at $22, June 1 issued 15% stack dividend, July 1 issued 10000 at $27, Aug 31 2-for-1 stock split reduce par $5, determine the weighted average number of shares based on the transactions

*March 30, 2014*

**CHEMISTRY**

A voltaic cell is constructed that uses the following reaction and operates at 298 K: 2 Al(s) + 3 Mn^2+(aq) 2 Al^3+(aq) + 3 Mn(s). What is the potential, E, of this cell when [Mn^2+] = 0.10 M and [Al^3+] = 1.5 M?

*March 16, 2014*

**Chem HELP !!!**

Using a table of standard electrode potentials (as in Appendix M of your text), calculate the standard cell potential, Eo, for: 2 Fe2+(aq) + Cl2(g) 2 Fe3+(aq) + 2 Cl(aq).

*March 16, 2014*

**law**

there are two kinds of law in south africa.write a paragraph in which you identify these two kinds of sources of law;name the examples of sources of law that belong to each kind;and indicate the differences betweem these teo kinds of sources of law.

*March 16, 2014*

**Physics**

Two charges repel each other with a force of 10-6N when they are 10cm apart. when they are brought closer together until they are 2cm apart the force between them becomes?

*March 3, 2014*

**Math**

The scores of students on standardized test are normally distributed with a mean of 300 and a standard deviation of 40. Between what two values do 99.7% of the test scores lie?

*March 1, 2014*

**Psychology**

People in the grocery store are asked to do a taste test of a new soft drink product. Two paper cups are given to each person who volunteers. Fifty percent of the participants are given two different soft drinks. The other half receive the same product, but are told the drinks...

*January 20, 2014*

**math- commutative property**

The Answer Is D Because if you have 4 pencils and i have 7 apples, how many pancakes will fit on the roof? well the answer is purple because aliens don't wear hats. Thanks :)

*January 9, 2014*

**chemistry**

a 350ml buffer solution is .150M in HF and .150M in NAF. What mass of naoh could this buffer neutralize before ph rises above 4.0? So far I got .285714 from 10^-.544. After that I tried to do .285714(x/.0525-x) but this doesn't worl. The answer is 1.2g. Help, please?

*January 4, 2014*

**English**

does anyone know of a website where i can get info on why vampires attract the interest of human beings? thank you its for a essay

*December 10, 2013*

**home inspection**

8. Based on most standards of practice guidelines, which of the following home components should you include in your inspection? A. Burglar alarms B. Windows C. Appliances D. Door locks

*December 4, 2013*

**English**

go to easy bib

*December 1, 2013*

**math**

On a map of the Fox River, 1 centimeter represents 6.5 kilometers. If a trail by the river is actually 26.65 kilometers long, what is the length of the river on the map?

*November 19, 2013*

**Math**

Solve for x: 4(2-x)>8x+20

*October 17, 2013*

**chemistry**

What is the final volume in milliliters when 0.700L of a 46.9% (m/v) solution is diluted to 20.1% (m/v)?

*October 16, 2013*

**Chemistry-**

Okay, i thought so...I was confused since I'm using N with the units in a formula but I can't seem to find a way to cancel it out. Maybe you would know how? Formula: Z= Zwall x Area 4.18x10^14 mol s^-1 / 6.04x10^23 m^-2 s^-1 = Area 8.4x10^-6 m mol = r How would I ...

*October 1, 2013*

**Chemistry-**

If I was trying to find out the number of molecules(N) using moles x avogadro's number, what units would N have?

*October 1, 2013*

**Chemistry**

A tubular fluorescent lamp in a fully evacuated supply compartment on the international space station was originally filled with a small amount of mercury vapour. When the lamp began to flicker the astronauts complained there was a tiny hole in the tube. They measured that the...

*October 1, 2013*

**Maths**

An initial-value problem is given by the differential equation, f(x,y) = –20xy2, y(1) = 1. Use the classical fourth-order Runge-Kutta method with a step-size of h = 0.02, to obtain the approximate value of y(1.02). Give your answer to 6 decimal places.

*September 29, 2013*

**Average deviation**

If I'm asked for the average deviation, what is the unit I should use for the answer?

*September 28, 2013*

**Chemistry**

An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g). If 395mL O2 is collected over water at 25C and 749.2mmHg barometric pressure, then what is the percent by mass of AgO2 in the sample? The vapor pressure of water at 25C is 23.8mmHg. Could someone help me ...

*September 27, 2013*

**Chemistry**

2 NaN3(s) = 2 Na(l) + 3 N2(g) How many grams of NaN3 are needed to produce 20L of N2(g) at 303K and 776mmHg?

*September 24, 2013*

**Chemistry**

The half life of U238 is 4.5 x 10^9 yr. A sample of rock of 1.6 g produces 29 dis/sec. Assuming all radioactivity is due to U238 find percent by mass of U 238. I have tried ln(t)/ln(0)= -kt and still cannot get the answer What I get is A) 4.5x10^9 x365x60x60x24=1.419x10^17 for...

*September 22, 2013*

**math**

7+7 No there

*September 12, 2013*

**Business math**

A store had 896 swimsuits that were marked to sell at $46.99. Each suit was marked down $15.90. Find the reduced price using the formula M = S – N, where M is the markdown, S is the original selling price, and N is the reduced price.

*September 8, 2013*

**Chemistry re-post**

I took a look at this question to see if I copied it correctly, and it does NOT say how much of the solution was used. It does use mols as the unit. Dr. Bob, I am not sure what you mean by "decays into Argon." I realize that the 38 CL decays to Argon, but how would ...

*July 23, 2013*

**MT**

Is this grammatically correct?

*July 22, 2013*

**Chemistry**

I posted this before and am sorry to post again and take up room but it is due this week and I'd like to understand how to get the answer (no one has responded yet): question The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is ...

*July 22, 2013*

**Chemistry**

I posted this before a few hours ago without a reply yet but decided I would add more detail: question The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. ...

*July 21, 2013*

**Chemistry**

The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. What is temperature of container? I have tried calculating the decay rate of the 38cl and then plugging ...

*July 21, 2013*

**chemistry**

write a balanced equation for the chain reaction AL2O3

*July 13, 2013*

**Statistics**

is that 2C = 0.0229885?

*May 18, 2013*

**mathematic**

OK but really about part C I'm confused. I think it should be 25% or 0.25 but it is wrong!!!!

*May 18, 2013*

**math**

solve by the elimination method x + y = -2 4x - 6y = -3

*May 9, 2013*

**Calculus**

In a right triangle, if one leg (adjacent to 90 degrees) is 10cm, which is increasing at the speed of 2cm/s; and another leg is 24 cm, which is decreasing at 2cm/s. how fast is the hypotenuse changing at this time?

*May 6, 2013*

**Trig**

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.

*April 21, 2013*

**chemistry**

A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

*April 19, 2013*

**chemistry**

A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

*April 19, 2013*

**math**

Put this in exponent form: (3square root of x) ( square root of x cubed)

*April 18, 2013*

**Math**

Ill just use log then I think I get tht... but how did u come to 2^x=112...?

*April 18, 2013*

**Math**

Mr.Reiny, We don't use logs yet, so how do I find it without using log?

*April 18, 2013*

**Math**

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks...

*April 18, 2013*

**gr 11 Math**

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks...

*April 18, 2013*

**math**

(3square root of x) ( square root of 3 cubed)

*April 18, 2013*

**math**

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3¡îx)(¡îx©ø) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. ...

*April 18, 2013*

**english**

Religion is non-existent and present simultaneously in the form of preconditioning and technology, social classes are used for defining individual purpose and harmony among citizens, and drug use is the backbone for provoking happiness. Would that be a good sentence?

*April 16, 2013*

**english**

yeah but how doi make this sentence into a better sentence for the endof my into like the three main points I will be discussing. How do I end my intro?? We r not allowed to us first person.

*April 16, 2013*

**english**

There is total social stability, there is almost no disease, very low crime, high rates of happiness and acceptance of death.

*April 16, 2013*

**english**

science and technology

*April 16, 2013*

**english**

so Ms.Sue, can you help me with my last sentence of intro about what three arguments. I am going to talk about in my body paragraphs.

*April 16, 2013*

**English..Ms.Sue(take a look here please)**

hmm.. well I don't know I cant think of any more...at the end how do I put it into a level 4 sentence including what I will be writing about in the body:(

*April 16, 2013*

**English..Ms.Sue(take a look here please)**

It can be a utopia since each individual is happy..right? But that is only one can u help me wid the other 2? and putting it all in a sentence... Ms.Sue!!! This is worth 15% it is a summative:( My life stinks...I need ur guidance..

*April 16, 2013*

**English..Ms.Sue(take a look here please)**

yes I understand that, I checked the sites out and they say first step is to pick up a topic, which in this case is what I don't understand, then ask a question regarding the topic than answer the question and finally reword the answer. So can u plzzzz help me with the ...

*April 16, 2013*

**English..Ms.Sue(take a look here please)**

Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost. It is a utopia •English - Ms. Sue, Tuesday, April 16, 2013 at 1:14pm I think a good thesis would be: Brave New World reflects a dystopia, not a utopia. •...

*April 16, 2013*

**English**

But it says.. discuss the society in Brave new world as a utopia. So don't you think the thesis should be more detailed and well structured.

*April 16, 2013*

**English**

Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost. It is a utopia

*April 16, 2013*

**English**

Its a utopia as i saiid above

*April 15, 2013*

**English**

I have already visited those sites... I have read the book and it is a utopia. I just want a excellent thesis:( but i just cant think of one. Please help me if u can.

*April 15, 2013*

**English**

Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost.

*April 15, 2013*

**algebra**

In the early months of some year, one site added 0.6 million new accounts every day. at this rate, how many days would be needed to add 30 million new accounts?

*April 14, 2013*