# Posts by abby

Total # Posts: 1,138

**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 ...

**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? ...

**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...

**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 &...

**chemistry**

Ah! okay! But thank you so much for answering a few!

**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 ...

**Math**

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

**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

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

Oh ok, thanks!

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

Is a blog a print media? yes or no? I think yes it is.

**chemistry**

we're in the same class!

**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

**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! :)

**Math ~ Need Help! ~**

Thnx

**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.

**Math! HELP!**

Can you help me with some graph ones?

**Math! HELP!**

Reiny, Steve!! I need help!

**Math! HELP!**

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

**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. ...

**Language Arts-check answer-**

ok

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

I just need #2 and #3!

**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...

**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 ...

**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?

**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?

**History**

The correct answer is India.

**History**

Thank you!

**History**

China but when I took the test it said that, that was wrong.

**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.

**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...

**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?

**science**

whats the uses of the element mercury?

**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...

**science(please check answers)**

Jiskha is totally right i got 100% THANKS SOOOOOOOOOOO MUCH

**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

**Mathematics**

296 :)

**Mathematics**

Find the amount of increase if 740 is increased by 40%

**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=

**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?

**Mathematics**

thanks

**Mathematics**

Convert to years, expressed in decimal form to the nearest hundredth. 10 months

**Mathematics**

Find the amount of increase if 480 is increased by 10%

**math**

Thank you

**science**

Ithank you

**science**

An objects ______ does not change no matter where in the universe it is.

**science**

An objects _________ does not change no matter where in the university

**Math**

Suppose a baseball player had 212 hits in a season. In given probability distribution, the random variable X represents the number of the player obtained in a game 0 0.0908 1 0.4677 2 0.2988 3 0.1163 4 0.0147 5 0.0117

**math**

What are all the 2 numbers thy equal 24

**Question About Math**

So #1 is A and #2 is D?

**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...

**Math**

I do not know

**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 ...

**Math**

Thank ya'

**Math**

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

**History**

What is the purpose of government?!?

**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...

**Algebra /.-**

Thanks!

**Algebra /.-**

-4x-23=-107 Help!?!?

**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. ...

**science**

Explain what causes the tides to change

**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...

**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: ...

**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

**Math**

Thank ya' ^.^

**Math**

5(2a + b)-2(3a-5b) Is the answer 4a+15b just checking

**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?

**Cesar chavez**

1,500 or 1,800

**Math**

Help! Plz 3/4(x)=8

**Social studies (urgh!)**

^.^ :P

**Social studies (urgh!)**

Thanks love it!

**Social studies (urgh!)**

What would you draw for the word diverse/diversity?!? Definition: many & different

**Reading**

I can't find the word keening in the book hatchet

**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.

**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?

**Geography**

how is the magnitude of a quake related to the loss of a life

**science**

1x10-2

**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)¿...

**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 ...

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

Thank you very much!!!

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

Hey! 2y-8y=-4 Do I subtract or do I add?!? Something like that right?!?

**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. :)

**7th grade math**

That's cool :)

**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)

**7th grade math**

Thanks Ms. Sue your the BEST!!!!! (You should be a teacher)

**7th grade math**

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

**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)

**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

**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)

**7th grade math**

Horses, pigs and cows is really easy I can do it in my head but, my teacher told me I would have to start showing my work. I really have no clue how to do that I have always done it in my head. Can you pretty please help me I would gladly appreciate it. Thank you. :)

**science**

To stop using it duhhhh!?!! ;)

**statistics**

Yes

**Science**

100 ml of water at 20 degrees celcius has more,less, or the same thermal energy than 500 ml of water at 20 degrees?

**5th grade Language Arts**

Defensible, indivisible, inedible, imperfectible :) hope I helped

**math**

Please help me find the rule input 0 output 2 then input 1 output 4 next input 2 output 6 then input 3 output 8 last input 4 output 10 Thanks

**math**

Jenny wants to buy cereal that comes in large and small boxes. The 32 ounce box costs $4.16and the 14 oz ox costs $2.38.which box is less expensive per oz?

**polamar**

order these fraction from least to greatest 3/4,-2/3,7/10,-5/6

**math**

670

**Math**

No c is not correct the answer is A because it only does numbers that go in order did this help you at all

**Science**

trying to relate growth to temperature. the control will be food placed covered back into the refrigerator at one hour compared to food left out, uncovered at 2 hours, 3 hours and 4 hours.

**Science**

My science fair project is growing bacteria from food that is left out and seeing how much the bacteria increases over time. How would I write my hypothesis?