Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 70,607

**Chemistry **

A 0.60 M solution of a weak acid, HA, has a pH of 3.72. What is the percentage ionization of the acid? What is the value of Ka for the acid?

**chemistry**

Which of the following statements is true concerning the titration of a weak base by a solution of hydrochloric acid? Question 9 options: At the equivalence point, the pH is 7. At the equivalence point, there is excess hydrochloric acid. At the equivalence point, the pH is det...

**Chemistry**

what is the pH of 0.80 M NaCN? What is the concentration of HCN in the solution?

**chemistry**

Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ. a. Write a correct, balanced thermochemical equation for this reaction. (Reme...

**chemistry**

a mixture of N2, O2 and Ar have mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 atm?

**Algebra**

3/(4x-36)- 5/(2x-4) - 2x/(x^2-11x+18) Simplify and expand the expression?

**math**

Show 1/5 of a set of 15 counters. How many counters?

**Math**

Hello I need help on this problem: The directions for lemonade say to put 2 cups of the, liquid concentrate into 1 gallon of water. If I want to make 1 pint of lemonade, how many fluid ounces should I use.

**SS**

How might attracting foreign investment help a country (the country receiving the investment)?

**Statistics**

any luck

**trigonometry **

the angle of elevations from the top of the tree to the point on the ground is 63 yards from its base 45degrees. How tall is the tree?

**Math**

Bart won the jellybean estimation contest at his class Easter party he won 28 Easter stickers he gave 1/8 of the stickers to his friend rob how many stickers did he give rob

**Precalculus**

Two steps after multiplying the top and bottom, why does tan become 2tan on top

**Precalculus**

Verify: Tan u + sec u-1 / tan u - sec u+1 = tan u + sec u

**algebra**

A guy rope is attached to the top of a tent pole. The tent pole is 8 feet tall. If the guy rope is pegged into the ground 5 feet from the tent, how long is the guy rope?

**world geography**

In Caribbean, Puerto Rico and Jamaica are islands of the Lesser Antilles

**Chemistry**

Thank you so much for your help. It means the world!

**Chemistry**

so would it be n=4 since that is the largest outer shell ms= + 1/2, -1/2 since it has 2 electrons in 4s but what would happen if it was 3d? Would that be times by 5? and I'm still a little confused on what the two others represent. I'm sorry for being such a bother!

**Chemistry**

What does each stand for? So if I am doing it for fluorine, what would n, l, ml, and ms represent? For instance, is n the sublevel or what? I'm rather confused.

**Chemistry**

List all the quantum numbers for each of the 9 electrons in fluorine n L m sub L m sub s 1. 2. 3. 4. 5. 6. 7. 8. 9.

**Chemistry**

Astatine?

**Chemistry**

Which halogen has the lowest electron affinity?

**Language Arts**

So I answered a couple of the questions about "The Boarded Window" by Ambrose Bierce. But can you help me with this please? What in the text indicates the beliefs and values of the author?

**College Math**

F'(x) = 3(x^2 +4x +2/(x+2)^2 F'(x) = 5cos(5x + e^2) F'(x) = 6x(e^x) + e^x (6) = 6e^x (x +1)

**Math**

A boat must be moored 25 feet away from a dock. The boat will be 10 feet below the level of the dock at low tide. What is the minimum length of rope needed to go from the boat to the dock at low tide?

**Rectangular coordinates to polar coordinates**

1) I'm asked to find 2 sets of polar coordinates for the point for 0≤ θ< 2pi from a given pair of rectangular coordinates . For instance, one of the coordinates was (-3,4). I found r = plus and minus 5.Then θ= arctan (y/x)= arctan (4/-3)= -.9273 I know y...

**Radioactivity **

How are the terms "activity" and "becquerel" related? A radioactive isotope source has a mass of 120 g. If the isotope has a half life of 20 secs what would be the mass of the isotope in 2 mins?

**justin**

You require space to service 65 vehicles at any one time. Will a facility measuring 145 ft. by 130 ft. be adequate if each vehicle requires 300 sq.ft.?

**math**

You sell and service vacuum cleaners. Your price on a particular model is $125. However, to get a service contract, you offer to sell it for $115. How much discount are you giving as a percentage of price (to the nearest tenth)?

**Algebra**

One person can complete a task in 3 minutes. A second person can complete the same task in 5 minutes. How long will it take to complete the task of the two people work together?

**English: tragedy**

Paraphrase this line by line: I don't understand this.. In tragedy, man is a paradox in a paradoxical existence. Fallible and vulnerable in his mortal finity, he is yet capable of transcendent greatness. Freely exercising his will (a passive hero is pathetic rather than tr...

**Trig**

how do you find the standard form of 7(cos255degrees + isin255degrees) ?

**Math**

Given the total profit function P(x) = 1.3x-.01x^2-30, let x represent a number of days and find maximum profit achieved and when that profit is made. Then graph the function and mark the vertex

**Geometry- trig ratio**

25,636 ft?

**Geometry- trig ratio**

An observer (o) spots a plane flying at a 55 degrees angle to his horizontal line of sight. if the plane is flying at an altitude of 21,000 ft, what is the distance (x) from the plane (p) to the observer (o)?

**Social Studies**

I have worked on this assignment for days and I am just lost! Can't tell you how much I have researched it!

**Social Studies**

I am the Star Reporter who is going to visit George Washington at his home at Mount Vernon during the years of 1759-1774. I am interviewing him about his political and personal views, activities, goals, and predictions. Develop 10 questions to ask President Washington. Then t...

**college physics**

A reflecting telescope has a radius of curvature of 3m for its objective mirror and a radius of curvature of -1.5 for its eyepiece mirror. If the distance between the two mirrors is 0.90 m, how far in front of the eyepiece should you place the electronic sensor to record the i...

**reading**

Tom has difficulty battling distractions while studying. Which of the following strategies would help him with this problem?

**Geometry**

Elimination -12x -8y=-20 -3x +9y=-27

**science**

A car driver accelerates to a speed of 35 mph and then takes her foot off the pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. What causes that?

**Algebra 1 Explanation (Anyone, please!)**

Reiny's method is fine, but the "standard" method is like this: Find the vertex, which is the highest or lowest point of the parabola. Use -b/2a first. y = ax^2 + bx + c y = x^2 - 2x - 3 2/2 = 1, axis of symmetry. y = 1^2 - 2(1) - 3 y = 1 - 2 - 3 y = -4 Vertex: (...

**Grammar**

That's why some writers don't like the dashes. It can make a sentence really long without having to use standard punctuation (commas, colons, etc).

**math**

Compute the amount of interest earned in the following simple interest problem. A deposit of $8,000 at 9.5% for 120 days.

**math**

Zeller, Inc., has 60,000 shares of stock outstanding. Zeller declares a dividend of $580,000. What is the dividend per share?

**math**

Which of the following situations is an example of a linear function?

**math**

The account balance on April 1st is $50.51. On April 15th a payment of $15.00 is made. On April 25th a purchase of $19.27 is made. The annual rate is 18%. What is the finance charge using the previous balance method? What is the new balance?

**Precalculus**

1. Consider the curve y=x^2. a. write down (dy)/(dx) My answer: 2x The point P(3,9) lies on the curve y=x^2. b. Find the gradient of the tangent to the curve at P. My answer: 2*3=6 c. Find the equation of the normal to the curve at P. Give your answer in the form y=mx+c. My an...

**math**

Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds?

**calculus**

false

**c**

Yes, B.

**HELP!**

btw I took honors biology in 8th grade and this year I'm taking honors earth science. Usually you take honors chem at a sophomore if your an honors student but teachers can recommend you to AP.

**social studies**

How do the words dialect and heritage help understand European culture?

**math**

tameka draws a line that would cut a square in half. she says makes 2 smaller squares. is tameka correct? explain

**Physics**

Magnification=f/f-do m=6/6-2 m=1.5

**Physics**

A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?

**Math**

(6x4 – 3x + 5) – (3x4 + 4x3 – 6x2 + 1)

**M a t h**

A small plant manufactures riding lawn mowers. The plant has fixed cost (leases, insurance, etc.) of $48,000 per day and variable cost (labor, materials, etc.) of $1,400 per unit produced. The mowers are sold for $1,800 each. So the cost and revenue equations are y= 48,000 + 1...

**Social Studies**

I am the Star Reporter who is going to visit George Washington at his home at Mount Vernon during the years of 1759-1774. I am interviewing him about his political and personal views, activities, goals, and predictions. Develop 10 questions to ask President Washington. 1. What...

**trigonometry**

An angle measuring (468n)° is in standard position. For which value of n will the terminal side fall along the negative portion of the x-axis

**physics**

A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?

**physics**

The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right edge, and the force rema...

**Radioactivity**

Thank u so much :)

**Radioactivity**

The mass number of an atom undergoing beta decay doesn't change. However the daughter nucleus is a different element than the parent. Explain how this is possible

**Science radioactivity**

Thanks a ton!!!!!

**Science radioactivity **

why are alpha and beta radiation referred to as particles while gamma radiation is referred to as rays?

**statistics**

YOU ARE DOOMED!!

**M A T H**

A small plant manufactures riding lawn mowers. The plant has fixed cost (leases, insurance, etc.) of $48,000 per day and variable cost (labor, materials, etc.) of $1,400 per unit produced. The mowers are sold for $1,800 each. So the cost and revenue equations are y= 48,000 + 1...

**physics 1**

A person is sitting with one leg outstretched and stationary, so that it makes an angle of 30.0° with the horizontal, as the drawing indicates. The weight of the leg below the knee is 50.5 N, with the center of gravity located below the knee joint. The leg is being held in...

**Chemistry**

Zn(s)+2HCl(aq) ->ZnCl2(aq)+Hx(g) How many millilters of 2.50M HCl(aq) are required to react with 3.95 of Zn(s)?

**Math**

I did my math wrong, I dont know what I was thinking. Thanks for your help.

**Chemistry **

Can alcohol dissolve any of these? PCl5 NaNO3 NH3 KOH KCl

**american history**

under America's second party system, the whigs stood for?

**LA**

3. In basketball, the most elite athletes would (1 point) be professional. become coaches. fail to make the team. have fun. 4. Read the sentence below. Based on the context clues in the sentence, which is the best definition for the italicized multiple-meaning word? The lawyer...

**science**

If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird<---- a person sitting next to you Which of the following reference points would allow you to observe the speed of a...

**Help**

A homeowner determined that he used 114 gallons of oil every month to heat his home during the winter. This information would be considered part of his _______________________________.

**Math help**

Elizabeth bought 3-inch tomato plants at home depot. Each week after she bought the plants she measured their height. she recorded the data in the table below. Time(wks) 0 1 2 3 4 Height of tomato plants(in.)3 5 7 9 11 what is the Independent variable? What is the dependent va...

**Math**

Jackson jogged a total of 8 9/10 miles this week. His friends Aaron and Tanya jogged 4 3/4 miles and 9 2/5 miles respectively. How many more miles did Aaron and Tanya jog than Jackson?

**LA**

9. B 10.C 11. D

**LA**

In all of recent American history, there has been no worse river flooding than what occurred on the Mississippi River between late June and the middle of August in 1993. Record flooding affected communities from Minnesota to Missouri. Iowa and Illinois joined those states as ...

**Science**

A homeowner determined that he used 114 gallons of oil every month to heat his home during the winter. This information would be considered part of his _______________________________. Idk this one please help!!!

**SCIENCE**

To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ polluti...

**algebra 1 question pls help!!!**

Fraction as a percent 4/5

**algebra 1 question pls help!!!**

Welcome!

**algebra 1 question pls help!!!**

mean 23.625 median 24 mode 25

**Science**

In the ocean, there are areas where there are very few living things. _________________________ is the term that describes when this happens to a natural area.

**Science**

what do you call it when there are few living things in an area? Extinguish?

**Chemistry Equilibrium**

For the reaction NO2(g) + NO(g) N2O(g) + O2(g) Kc = 0.914. Equal amounts of NO and NO2 are to be placed into a 5.00 L container until the N2O concentration at equilibrium is 0.0446 M. How many moles each of NO and NO2 must be placed into the container?

**Chemistry Equilibrium**

At 200 °C, Kc = 1.4 x 10-10 for the reaction N2O(g) + NO2(g) 3NO(g) If 0.174 mol of N2O and 0.337 mol NO2 are placed in a 4.00 L container, what would the NO concentration be if this equilibrium were established?

**math**

Define a new class Assistant that represent a faculty member who works a certain number of hours each month. In this case, the salary is computed by multiplying the working hours by the hourly payment rate. Create a new object of class Assistant and add it to the list...

**Science**

Problem: What are parts of a cell and how are animal cells different from plant cells? Hypothesis: Can someone help me get a hypothesis?

**MATH_URGENT**

54

**MATH_URGENT**

i dont know son

**3 questions~~~**

1. What does the term "fair-use exception" mean? (1 point) to use only material that has never been published the ability to use material made by others for educational purposes an exception to copyright restrictions for images only Educational material is no longer ...

**math**

Tim Worker buys a new sofa for $629.95. He pays 25% down and takes an installment loan to complete the purchase. He makes 12 payments which include his principal and a $60.00 finance charge. What is the APR on his loan to the nearest tenth? The down payment is? The amount fina...

**math**

Find the interest due to the bank on a loan of $1,000 at 7.5% for 280 days.

**math**

Sam decides to buy 100 shares of ABC company. They cost $26.25 a share. The commission is 5% of the total price. What is Sam's total cost?

**Math**

Integrate (5x^2 + 3x - 2)/(x^3 + 2x^2)

**Help!**

1. renewable 2. hydroelectric 3. non point 4. coal

**Help!**

Geothermal power would be classified as a(n) _____________________ resource because its supply will not run out. An example of a renewable and inexhaustible resource that requires the construction of dams is _________________________ energy. To solve the problem of a polluted ...

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