# Posts by nina

Total # Posts: 660

**Chemistry [back-titration] - please check my sol'n**

I get it now. I didn't think about the reaction of Fe^2 and Cr2O7^2-. I thought they would produce FeCr2O7, so I thought they're in 1:1 ratio. Yes, I got 159.6 g/mol as weight of TeO2 (as what I've typed above). :) Yes, I've seen the post about the nuclear chem...

**Chemistry [back-titration] - please check my sol'n**

A 7.00 gram sample containing the mineral tellurite was dissolved then treated with 70.0 mL of 0.03114 M K2CrO7. 3 TeO2 + Cr2O7 ^2- + 8 H+ -> 3 H2TeO4 + 2 Cr3+ + H2O When reaction is complete, the excess Cr2O7 2- required a 14.05 mL back titration with 0.1135 M Fe2+. ...

**Economics**

Which of the following is not a factor of production? A. Capital B. Goods and Services C. Labor D. Land

**American Goverment**

I think it's C

**American Goverment**

Which is an important function of county government? A. taxing imports B. overseeing tribal governments C. running elections D. hosting foreign leaders

**Math**

George says that if you subtract 185 degrees from an angle that measures 360 degrees, the new angle is an obtuse angle. Is this true

**To Nina**

Oh my, thank you so much for your help...! :)

**Chemistry (titrations)**

Thank you! I understand it now. :)

**Chemistry (titrations)**

15.00 mL of 0.01200 M EDTA were used to titrate 50 mL aliquot solution containing iron (II). How much iron (II) is present in the solution? The answer in the book is 201 ppm. I tried getting the moles of EDTA (n,EDTA = 1.8 x 10^-4 mol). I think they're in 1:1 ratio, or I ...

**Chemistry**

Calculate the amount of energy released per gram of nuclei when 2 protium nuclei react to form deuterium nucleus (protium = 1.00782 amu, deuterium = 2.01410 amu). The answer in the book is -2.0 x 10^10 J, but I don't have any idea on how to do this. Please help, and thank ...

**Personal Finance**

The maximum tax rate on estates and gifts: A. is gradually declining. B. is gradually increasing. D. has increased sharply

**Math Analysis 2**

assume that x=x(t) and y=y(t). Let y= (x^3)+4 and dx/dt=5 when x=2. dy/dt when x=2

**math**

Find the GCF and LCM of 15 and 50

**LANGUAGE ARTS UGRENT!!! (Check Answers)**

How about now Ms. Sue? 2: A 3: D

**LANGUAGE ARTS UGRENT!!! (Check Answers)**

Both are wrong?

**LANGUAGE ARTS UGRENT!!! (Check Answers)**

Oh okay. Are they right now? 2: The person that would buy the coat. 3: Anne has come to consider Mrs. Van Daan a member of her family because of the kindness she has shown.

**LANGUAGE ARTS UGRENT!!! (Check Answers)**

1. I was disgruntled by what you said, but I didn’t want to show my (1 point) happiness. **anger. jealousy. 2. When Peter tells everyone that Mr. Van Daan is going to sell Mrs. Van Daan’s coat, a stage direction reveals that Peter’s sympathy is with (1 point) ...

**Physics - please help me..**

A 1.35 kg mass is suspended from a spring with a spring constant of 189.0 N/m. The spring is attached to a rod which oscillates vertically at a frequency f. For what value of the frequency f will the system resonate?

**Damon**

I know that w=squ(k/m) and T=(2*pai)/w but its wrong and I don't know what to do.. can you help me?

**please help me.. physics**

A 1.30 kg mass is suspended from a spring, with a spring constant of 135.0 N/m. Find the driving frequency which would cause resonance.

**math**

Put into order from least to greatest 3/4, .85, 5/7, .62 My answer 3/4, 5/7, .62, .85

**math**

Put into order from least to greatest 3/4, .85, 5/7, .62 My answer 3/4, 5/7, .62, .85

**PHI103 WEEK 3**

This is the name for the reasons that one presents to support a conclusion. (Points : 1) Proposals Premises Deductions Inductions None of the above

**Physics**

A 3.00 gram lead bullet travels at a speed of 240 m/s and hits a wooden post. If half the heat energy generated remain with the bullet, what is the increase in temperature of the embedded bullet? (clead = 128 J/kg C)

**Earth Science**

Thx Richard and Ms. Sue i think i might get this.

**Earth Science**

The Rocky Mountains are more jagged than the Appalachian Mountains. This suggests that • erosion has worn down the Appalachian Mountains more than the Rocky Mountains. • the Rocky Mountains are older. • the Appalachian Mountains are more likely to experience ...

**trig**

Two Airplanes leave an airport at the same time on different runways. One flies on a bearing of N66degreesW at 325 miles per hour. The other airplane flies on a bearing öf S26degreesW at 300 miles per hour. How far apart will the airplanes be after 2 hours?

**trigonometry**

From a point 150 ft from the base of a building the top and the base of a flagpole on a roof edge have angles of elevation of 27degrees49' and 21degrees42' respectively. Find the height of the pole.

**trigonometry**

A ship is sighted directly east of a lighthouse. Another ship, which is 20m away from the first ship, is observed at a bearing of N25degreesE from the lighthouse. If the first ship is 4.1 km away from the lighthouse, what is the distance of the second ship from the lighthouse?

**Math**

The length of a football pitch is 100m and the width of the pitch is 80 m calculate the length of a diagonal of the pitch give your answer to the nearest metre

**Math**

A plane flies due east for 120 km from airport a to airport b it then flies due north for 280 km to airport c finally it flies directly back to airport a calculate the direct distance from airport to airport a give your answer to the nearest kilometre

**English (grammar)**

Hi. I just want to ask if the statement below is grammatically correct: " I'll keep up what I can do for other people. " I think the thought of the statement can be understood, but I'm not sure if the grammar is correct (or the words are like jumbled). Help ...

**PHI 103**

If P is true, and Q is false, the truth-value of "P v Q" is (Points : 1) false. true. Cannot be determined All of the above

**Math**

emma has a small garden. Emma's garden is 1/5beans 1/8 piece & 1/2 corn. the rest is planted with flowers. what fraction of Emma's garden is planted with vegetables

**Math**

emma has a small garden. Emma's garden is 1/5beans 1/8 piece & 1/2 corn. the rest is planted with flowers. what fraction of Emma's garden is planted with vegetables

**PLEASE HELP!!!!**

((cotx+cscx)/(sinx+tanx))=cotxcscx Please prove left side equal to right side, only doing doing work on the left.

**Math**

emma has a small garden. Emma's garden is 1/5beans 1/8 piece & 1/2 corn. the rest is planted with flowers. what fraction of Emma's garden is planted with vegetables

**math**

thank you :)

**math**

What integer would represent "twenty-two hundred feet above sea level"?

**PHI 103**

If an argument does not commit a fallacy, it is A.necessarily valid. B.necessarily sound. C.Not enough information to determine D.Both A and B

**PHI 103**

A person who is shown his or her argument commits a fallacy should A. run screaming from the room. B. argue louder. C. add another fallacy. D. revise the argument.

**English (grammar)**

Thank you very much for your help. :)

**English (grammar)**

Thank you for your reply. :) By the way, how about if it's in the past (contributes -> contributed)? Can the phrase still be 'to your becoming'?

**English (grammar)**

Is this statement correct? "Helping other people contributes to your being a great leader." I'm not really sure with the phrase 'to your being'. It sounds incorrect but I'm not really sure. If it's incorrect, how do I rephrase the sentence?

**PreCal**

Logarithm of a negative number is imaginary. If you try plotting y = log x, you'll see that the x values are all positive and infinitely approaches zero.

**math check**

what unit of measure would you use to describe the distance from your house to school? D. Meters a.grams b. kilometers c. liters d. meters

**Math**

I need help

**ELA? Check answers!!**

1. Which of the following places would need to be sterile? A: park B: classroom C: A hospital operating room 2.Which of the following example of a question you might ask yourself to monitor comprehension? A: How can thrid-degree burns be treated at home? B: How is a third-...

**Math Help! Someone please help?:)**

1. The sides of a square are increased by a scale of 6. The perimeter of the small square is 10ft. What is the perimeter of the larger sqaure? 2.5 ft, 10 ft, 60 ft, 120 ft 2. A map of Utah has a scale of 1 cm:30 mi. The boarder of Utah and Wyoming measures about 3.7 cm. How ...

**Math help**

Solve this equation and check answer Fraction→n/56=8

**Math help**

Solve this equation and check answer Fraction→n/56=8

**Physics**

A 5 kg ball rolls down a 10meter long slope. Ignoring friction, how fast will the ball be rolling when it reaches the bottom?

**biology**

How does mitosis in plant cells differ from that in animal cells? A. Animal cells lack a cell plate. B. Plant cells lack centrioles. C. Plant cells lack spindle fibers. D. Animal cells lack cytokinesis. I chose b but I got it wrong please help....

**AP Calculus**

Consider the function f(x)= abs(x)(x-3)/9-x^2 a) what is the domain of f? What are the zeros of f? b) find all nonremovable discontinuities of f c) determine all vertical and horizontal asymptotes of f

**Math**

9 7/8 + 2 7/8 I get 11 14/8 Is that right

**history**

Write me a paragraph describing all the components of the English Bill of Rights that seem familiar or you know are the law in America.

**Algebra 2**

Jessica's bank contains 18 quarters and dimes, of which q are quarters. Find the total value of the coins in dollars.

**Algebra 2**

Jessica's bank contains 18 quarters and dimes, of which q are quarters. Find the total value of the coins in dollars.

**Algebra 2**

Is this right?? (x)(x-2)(x-4)

**Algebra 2**

A pyramid has a rectangular base. Find the volume if the length and the width of the bad and the hight are three convective odd integers and x is the largest integer.

**Acc Algebra 2**

1. Name the property that Justifies each step in the simplification below. 1/2[(x+2)+(-x)]=1/2[-x+(x+2)] a.__?__ =1 /2[(-x=x)+2)] b.__?__ = 1/2(0+2) c.__?__ = 1/2*2 d.__?__ =1 e.__?__ My answers a. Communitive Property b.Assotiative Property c. equavelent expression d. ...

**chemistry**

find the ph of the resulting solution 10 ml of 0.06 mol/l is mixed with 20 ml of 0.02 mol.l Ca(OH)2

**Math**

erica painted a picture of her dog the picture has an area of 3,600 cm2 and is a square. she has placed the picture in a frame that is 5 cm wide. what is the perimeter of the picture frame?

**Math**

erica painted a picture of her dog the picture has an area of 3,600 cm2 and is a square. she has placed the picture in a frame that is 5 cm wide. what is the perimeter of the picture frame?

**English 09**

I need to create different nicknames for each character in Romeo and Juliet. Please Help. The nicknames should describe the character Juliet- Tybalt- Prince of Cats Rome- Lady Capulet- Lord Capulet- Lord Montague- Lady Montague- Nurse- Friar Lawrence- Paris- Prince Escalus- ...

**Geometry**

What is the measure of m<JIH ? FE = 7.5 cm IJ = 7.5 cm m < FGE = 28 degrees A. 124° B. 56° C. 28° D. 62°

**Chem**

In a preweighed flask a sample of5.8 gm was combined with water,mass of solid and water after subtracting flask weight is24.6gm,density of water is 0.997g/ml,what is density of solid.

**English**

What are some mature ways to decide issues within groups?

**Help english**

They can block Facebook in their computer. Instead of spending time chatting in Facebook they can go read a book of help your mom in the house. You can also hang out with friends or do some other fun activities such as playing soccer or any kind of game.

**Math**

How much flour is in the bag

**Math**

Christy had a full bag of flour. She made two batches of muffins.each batch used 2 1/4c if flour. Then she used 1 1/2c of flour to make pancakes. The remaining of 2 1/6c to make banana bread.

**Math**

Write multiplication sentence for 4 4/5+ 4 4/5 + 4 4/5

**Math ASAP please**

Thanks!

**Java programming**

List all overloading methods (including constructors) in this coding.. public class Circle { private double radius; private String colour; public Circle() { radius = 0; colour = ""; } public Circle (double r) { radius = r; } double getRadius() { return radius; } ...

**Java programming**

Write a Java program that stores Customer accounts with the attributes: (i) Name of the depositor (ii) Account number (iii) Type of account (iv) Balance amount And the methods: (i) Deposit (ii) Withdraw (iii) Display the balance You need to create an array of objects to store ...

**statistics**

The average height of 18-year-old American women is 64.2 inches. You wonder whether the mean height of this year’s female graduates from your local high school is different from the national average. You measure an SRS of 78 female graduates and find that = 63.1 inches. ...

**math-7th grade algebra 1**

Please show the steps and explain how to do this as well. 3√8 · 2√5

**math algebra 1**

Please show the steps and explain how to do this as well. 3√8 · 2√5

**math**

thank you so much :)

**math**

Please show the steps and explain how to do this as well. 3√8 · 2√5

**history**

What was the MAIN focus of African American activists in 1964?

**Physics**

The voltage across the cell membrance is 0.070 V the cell membrane is 0.10 µm thick what is the work done in joules to move one sodium ion (charge= 1.6 x 10 ^-19 C) from inside the cell to outside the cell?

**Physics**

The voltage across the cell membrance is 0.070 V the cell membrane is 0.10 µm thick what is the work done in joules to move one sodium ion (charge= 1.6 x 10 ^-19 C) from inside the cell to outside the cell?

**Physics**

In a typical living cell, the electric potential inside the cell is 0.070 V lower than the electric potential outside the cell. The thickness of the cell membrane is 0.10µm. What is the magnitude and direction of the electric field (E) within the cell membrane?

**math**

Thank You John! John is correct just got a 7/7

**Geometry**

If EF=2x-19, FG=3x-15, and EG=26, find the values of x, EF, And FG

**Math**

It has 6 sides but is the angle the same

**Math**

How many angles does a hexagon have

**Chemistry**

A salicyclic acid (MW= 138.123 g/mol) solution has a pH of 2.43. When 100 ml of this solution was evaporated 0.22g of dry salicylic acid was recovered. What is the Ka of salicylic acid?

**Chemistry**

what is x?

**Chemistry**

A salicyclic acid (MW= 138.123 g/mol) solution has a pH of 2.43. When 100 ml of this solution was evaporated 0.22g of dry salicylic acid was recovered. What is the Ka of salicylic acid?

**political science**

which political ideology would be against abortion, and why?

**Math**

Complete 0.246X10= Is it .0246

**Fahrenheit 451**

Reread these lines from the text, “No we’ll save what we can, we’ll do what there is left to do. If we have to burn, let’s take a few more with us. Here! He remembered the books and turned back. Just on the off chance.” What future event in the story ...

**Fahrenheit 451 theme**

Which detail from the text best exemplifies the theme of the novel? 1) “We know the damn silly thing we just did. We know all the damn silly things we’ve done for a thousand years and as long as we know that and always have it around where we can see it, someday we&#...

**Fahrenheit 451**

Carefully reread these lines, “Somewhere the saving and putting away had to begin again and someone had to do the saving and keeping, one way or another, in books, in records, in people’s heads, any way at all so long as it was safe, free from moths, silverfish, rust...

**Book: Fahrenheit 451 Ray Brad Bury**

. What does Granger mean when he says “I am Plato’s Republic” or that Montag is “the book of Ecclesiastes”?

**Math Problem/Homework Help Me!!!!!!!!!!!!!!!!!!!!!!!**

I have 26 questions on my math homework! but i need help with these! please help me i need it finished now! 2. Which type of angle do construction workers use when building to make sure that the walls and floors of a building are perpendicular? (1 point) acute obtuse right ...

**algebra 3**

how would you solve for this? and what is the answer? 48p^3+2p^5-p^7

**Chemistry**

How many moles of carbon dioxide would be produced if 25 g of copper carbonate were completely decomposed by heating?