Thursday

May 5, 2016
Total # Posts: 1,036

**chemistry**

What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 8p^1? Thank you!!
*March 12, 2014*

**chemistry**

Thank you!! You are so helpful!
*March 12, 2014*

**chemistry**

What is (delta E) for the traansition of an electron from n=9 to n=4 in a Bohr hydrogen atom? What is the frequency? Thank you!
*March 12, 2014*

**chemistry**

What is the wavelength, in nm, of light with an energy content of (1.35x10^3 kJ/mol)? Thank you!!!
*March 12, 2014*

**English 9 - HELP!**

I wanted you to check my answers. 1. c 2. c 3. a 4. c 5. a 6. d 7. b 8. e
*March 11, 2014*

**English 9 - HELP!**

1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1 point) recently discovered ...
*March 11, 2014*

**science**

i love this homework help program but i am trying to find an answer to this problem and all there is is the question. could you maybe help me out a little bit more by posting the answer too.
*March 10, 2014*

**chemistry**

Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? ...
*March 5, 2014*

**chemistry**

What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
*March 5, 2014*

**chemistry**

A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
*March 5, 2014*

**Math**

The area of a rectangle is 32 in.² the length is twice the width. what is the perimeter of the rectangle?
*March 2, 2014*

**chemistry**

A sample of gas is compressed from 13.57 L to 3.93 L using a constant external pressure of 2.91 atm. At the same time, 1,759 J of heat flows into the surroundings. What is the internal energy change for the gas?
*March 1, 2014*

**chemistry**

A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
*March 1, 2014*

**chemistry**

How do you calculate the volume on the left and on the right?
*March 1, 2014*

**chemistry**

The enthalpy change for the reaction below at 25oC is -2,051 kJ (per mole of C10H22). What is the internal energy change for the reaction at 25oC? 10 CO(g) + 21 H2(g) --> C10H22(l) + 10 H2O(l) Enter your answer in kJ (per mole of C10H22), rounded to the nearest kilojoule.
*March 1, 2014*

**chemistry**

The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 at 298 K. What is the standard enthalpy of formation of C2H6O(l) at 298 K? Give your answer in kJ mol-1, rounded to the nearest kilojoule. Do not include units as part of your answer. Note: The standard ...
*March 1, 2014*

**chemistry**

Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? ...
*March 1, 2014*

**chemistry**

When a 6.79-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 369 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1...
*March 1, 2014*

**chemistry**

What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
*March 1, 2014*

**chemistry**

Ah! okay! But thank you so much for answering a few!
*March 1, 2014*

**chemistry**

Hello, a few questions: Thanks so much! 1. The heat capacities of titanium and water are 0.522 J g-1 K-1 and 4.184 J g-1 K-1, respectively. What is the final temperature of the titanium-water mixture if a 175.0-g sample of titanium, initially at 90.0oC, is added to 50.0 g of ...
*March 1, 2014*

**Math**

A line in coordinate plane contains the points P(2, -7) and Q(-4, -1). What point is the midpoint of PQ?
*February 27, 2014*

**The Power of Media**

Ok, #1 is Which of the following is an example of a print medium? a.) a blog b.) a newspaper ******* c.) a magazine’s website d.) all of the above
*February 25, 2014*

**Is a blog a print media? yes or no?**

Oh ok, thanks!
*February 25, 2014*

**Is a blog a print media? yes or no?**

Is a blog a print media? yes or no? I think yes it is.
*February 25, 2014*

**chemistry**

we're in the same class!
*February 24, 2014*

**chemistry**

A 33.0-L cylinder contains 481 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 6.16 atm, assuming the temperature remains constant? Thanks! :D
*February 24, 2014*

**chemistry**

Hydrogen peroxide, H2O2, is used to disinfect contact lenses. What volume of O2, in mL, or O2(g) at 31 degree celsius, and 741mmHg can be liberated from 10.0mL of an aqueous solution containing 3.00% H2O2 by mass? The density of aqueous solution of H2O2 is 1.01g/mL. Thanks! :)
*February 24, 2014*

**Math ~ Need Help! ~**

Thnx
*February 24, 2014*

**Math ~ Need Help! ~**

• 1. Draw a segment and create a perpendicular bisector using the geometric construction techniques. • 2. Draw an angle and create an angle bisector using geometric construction techniques.
*February 24, 2014*

**Math! HELP!**

Can you help me with some graph ones?
*February 21, 2014*

**Math! HELP!**

Reiny, Steve!! I need help!
*February 21, 2014*

**Math! HELP!**

For questions 14-15, find the simplified form of each expression. (3/2b^4)^3 (3/5y^4)^-2
*February 21, 2014*

**Language Arts- Writeacher check again**

#2. Which is the correct MLA citation for a magazine article? a.) Brian Carson. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. Print. b.) Carson, Brain. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. ...
*February 21, 2014*

**Language Arts-check answer-**

ok
*February 21, 2014*

**Language Arts-Only 2 answers to check!**

I just need #2 and #3!
*February 21, 2014*

**Language Arts-check answer-**

#1. What is one thing a strong introduction does NOT do? a.) capture the reader's interest b.) present evidence to explain the topic******* c.) provide background information d.) state the main idea of the report #2. Which is the correct MLA citation for a magazine article...
*February 21, 2014*

**Language Arts ~CHECK MY ANSWERS~**

Read the following passage to answer #1 and #2. April 15, Miss Kinnian says I'm learning fast. She read some of the Progress Reports and she looked at me kind of funny. She says I'm a fine person and I'll show them all. I asked her why. She said never mind but I ...
*February 20, 2014*

**Math**

a 16-foot ladder is leaning against a house and is 2 feet away from the foundation of the house. How high up will the ladder reach?
*February 20, 2014*

**Is the Cations and Anions right?**

Is the Cations and Anions right? Iron (III) Sulfate its F 3+ and SO2- Colbalt (II) Chloride its Co+ and Cl-2 Nickel (II) Chloride its Ni 2+ and Cl-2 Copper (II) Sulfate its CU+ and SO-4 Are these right?
*February 19, 2014*

**History**

The correct answer is India.
*February 19, 2014*

**History**

Thank you!
*February 19, 2014*

**History**

China but when I took the test it said that, that was wrong.
*February 19, 2014*

**History**

During the nineteenth century, which of the following countries experienced a decrease in industrial production? A. Britain B. China C. India D. Japan Not sure I think the answer is C.
*February 19, 2014*

**Art**

1. This is where an interior designer does most of her work. in a factory at the client's home in an office <<<<<<<<< in a studio 2. When looking at fabrics, an interior designer will focus on these characteristics. shape and form space and color...
*February 19, 2014*

**MATH**

Lucy was helping her parents construct a concrete birdbath in her backyard. they had a cone shape and a flattened cylinder. how did they put this birdbath together?
*February 16, 2014*

**science**

whats the uses of the element mercury?
*January 20, 2014*

**Science**

Well Seeing as in the Answer is not C, and i believe its not D, And I really Dout' its C because It will not increase health in the future it will decrease it so there answer i would give would probably be B...
*December 26, 2013*

**Mathematics**

A man received an invoice for a leaf blower for $478 dated April 17 with sales terms of 4/10 EOM. How much should he pay if he pays the bill on April 29? is it - 478-(478*4/100)= $458.88
*December 17, 2013*

**Mathematics**

296 :)
*December 17, 2013*

**Mathematics**

Find the amount of increase if 740 is increased by 40%
*December 17, 2013*

**Mathematics**

The formula Total cost = Cost + Shipping cost - Holding cost is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+H. Solve the formula for C, the the cost of the asset. C=
*December 17, 2013*

**Math**

One company has $200,000 to distribute in dividends. There are 21,000 shares of preferred stock that earn dividends at $0.70 per share and 80,000 shares of common stock. How much money goes to preferred stockholders?
*December 15, 2013*

**Mathematics**

thanks
*December 14, 2013*

**Mathematics**

Convert to years, expressed in decimal form to the nearest hundredth. 10 months
*December 14, 2013*

**Mathematics**

Find the amount of increase if 480 is increased by 10%
*December 14, 2013*

**math**

Thank you
*December 14, 2013*

**Science!**

By any chance. Have you figured the questions out?
*December 6, 2013*

**science**

Ithank you
*November 26, 2013*

**science**

An objects ______ does not change no matter where in the universe it is.
*November 26, 2013*

**science**

An objects _________ does not change no matter where in the university
*November 26, 2013*

**math**

What are all the 2 numbers thy equal 24
*November 21, 2013*

**Question About Math**

So #1 is A and #2 is D?
*November 17, 2013*

**Question About Math**

Hello! I have two math questions: 1.) Marcos has 28 coins that are all nickels (n) and dimes (d). The value of the coins is $2.05. Which system of equations can be used to find the number of nickels and the number the dimes? A. n + d = 28 5n + 10d = 205 B. n + d = 28 10n + 5d...
*November 17, 2013*

**Math**

I do not know
*November 12, 2013*

**Science**

What process involves the comparison of rock layers with others in a sequence to determine its age? radioactive decay radiometric dating relative dating absolute dating To determine the most accurate and precise age of Earth's oldest rocks, geologists would use relative ...
*October 30, 2013*

**Math**

Thank ya'
*October 29, 2013*

**Math**

Help!?! 4x+49<9-x Thank ya ^.^ (^~\' my taco face lol ) (\:D-:) my cookie face lol )
*October 29, 2013*

**History**

What is the purpose of government?!?
*October 29, 2013*

**chemistry **

A sample of gas in a balloon has an initial temperature of 25\({\rm \, ^{\circ}C}\) and a volume of 1670\({\rm L}\) . If the temperature changes to 82\({\rm \, ^{\circ}C}\) , and there is no change of pressure or amount of gas, what is the new volume, \(\texttip{V_{\rm 2}}{V_2...
*October 29, 2013*

**Algebra /.-**

Thanks!
*October 23, 2013*

**Algebra /.-**

-4x-23=-107 Help!?!?
*October 23, 2013*

**History**

Will you please check my answers? 1. Which of the following is an example of new economic divisions in the European peasantry that began to occur during the fifteenth century? A. Peasants throughout Europe became poorer. B. Peasants living in the Balkans became freer. C. ...
*October 21, 2013*

**science**

Explain what causes the tides to change
*October 20, 2013*

**ALGEBRA 1 **

A nonstop bus ride from the bus station in Atlantic City, New Jersey, to the bus station in Albany, New York, took 6 hours. If the average speeed of the bus was 21 meters per second , what is the distance between the two bus stations, to the nearest kilometer? A. 756 B. 454 C...
*October 10, 2013*

**Algebra 1**

For $46, Joel can rent a machine to make novelty buttons to sell at the county fair. The materials cost $0.39 per button. How many buttons must he sell at $1.40 each in order to make a profit. Identify the graph that shows all the possible answers. A: 45, 46, 47, 48....... B: ...
*October 10, 2013*

**Math**

In the figure below, points A, B, and C are collinear, and AB and BC are each 6 units long. If the area of ACD is 24 square units, how many units long is the altitude BD? A. 2 B. 4 C. 6 D. 8 E. 12
*October 9, 2013*

**Math**

Thank ya' ^.^
*October 8, 2013*

**Math**

5(2a + b)-2(3a-5b) Is the answer 4a+15b just checking
*October 8, 2013*

**Algebra 1**

You work in the local mailroom at a college. One of your duties is to sort local mail from all of the other mail. You can sort 8 pieces of mail in 10 seconds. How many pieces of mail should you be able to sort in 45 minuets?
*October 3, 2013*

**Math**

Help! Plz 3/4(x)=8
*September 26, 2013*

**Social studies (urgh!)**

^.^ :P
*September 18, 2013*

**Social studies (urgh!)**

Thanks love it!
*September 18, 2013*

**Social studies (urgh!)**

What would you draw for the word diverse/diversity?!? Definition: many & different
*September 18, 2013*

**Reading**

I can't find the word keening in the book hatchet
*September 16, 2013*

**Algebra Its Urgent!**

A second number is three times a first number. A third number is 15 more than the first number. If the sum of the three numbers is 330, find the numbers.
*September 7, 2013*

**physics**

WA -10.0 nC point charge and a +20.0 nC point charge are 15.0cm apart on the x-axis.hat is the electric potential at the point on the x-axis where the electric field is zero?
*September 4, 2013*

**science**

1x10-2
*July 26, 2013*

**math**

Tell whether each of the following is true for all sets A, B, or C. If false, give a counterexample.? a. A-B=A- ∅ b. (A ¾B) ̅=(A ) ̅¾B ̅ c. A ¿(B¾C)=(A¿B)¾C d. (A-B)¿...
*June 15, 2013*

**Calculus**

If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, its height in feet after t seconds is given by f(t)=95t−16t^2 Find the average velocity for the time period beginning when t=1 and lasting (i) 0.5 seconds (ii) 0.1 seconds (iii) 0.01 ...
*May 31, 2013*

**7th grade math (help!)**

Thank you very much!!!
*May 21, 2013*

**7th grade math (help!)**

Hey! 2y-8y=-4 Do I subtract or do I add?!? Something like that right?!?
*May 21, 2013*

**giving up**

Why would you give up try and look it up or something duh quitters NEVER win!!! Hope you had nice dreams & that bed bugs didn't bite. :)
*May 21, 2013*

**7th grade math**

That's cool :)
*May 20, 2013*

**7th grade math**

O gosh that's a very long time wish you were my teacher (where did you teach? If you don't mind me asking)
*May 20, 2013*

**7th grade math**

Thanks Ms. Sue your the BEST!!!!! (You should be a teacher)
*May 20, 2013*

**7th grade math**

Hello there! I am totally confused what does x = 4x+3+2x= 54/9 Thank you ;) & please help me!?!
*May 20, 2013*

**7th grade math**

Thanks Reiny :) (sorry its all ratchit and says lexie b/c my 'lil sis was putting a ? And 4got 2 put it back to Abby)
*May 14, 2013*

**7th grade math**

(Blank) horses + (blank) pigs =22 (Blank) horses + (blank) cows =9 (Blank) pigs + (blank) cows =17 Hope that gives you an idea of what I am talking 'bout (if I could take a pic. I would) Sorry I meant 22
*May 14, 2013*

**7th grade math**

Thanks Ms.Sue!! My teacher gave me an example (I don't know so sorry) 28+38+34=100 h+p+c=50 h+(28-h)+(34-h)=50 -h+62=50 62/-50=50/-50 12 = h Thanks (it's really confusing)
*May 14, 2013*