Friday

April 18, 2014

April 18, 2014

Total # Posts: 992

**Chem**

So I found the Ka for HPO4^2- which is 2.2x10^-13 Then i found HPO42- on right side of the table and found the ka value which is 6.2x10^-8. Then, I used kb=kw/ka to and got 1.61x10^-7 Since kb>ka the reaction: HPO4^2- + H2O <--> H2PO4- + OH- would be the one most like...

**Chem**

I don't really understand what k2 and k3 means.. To find the predominant reaction, could I compare the ka and kb values for HPO4^2-?

**Chem**

I answered that, but the teacher marked me wrong.. so I don't understand why? The predominant reaction should be HPO4^2- acting as an acid right?

**Chem**

What is the equilibrium constant expression for the predominant equilibrium in HPO4^2- (aq)?

**Chem**

Nevermind, I think I understand it now. Thanks.

**Chem**

c) Ca (s) reacts and produces Co2(g) Can you explain to me why it's b please?

**Chem**

which of the following occurs when a sample of 0.1M HNO3 is tested? a) phenolphthalein turns pink b) bromthymol blue turns yellow c) Ca9s) reacts and produces CO2 (g) d) Na (s) reacts and rpoduces NO2 (g)

**12th Grade Calculus **

Find d^2y/dx^2 by implicit differentiation. x^(1/3) + y^(1/3) = 4 I know that first you must find the 1st derivative & for y prime I got 1/3x^(-2/3) + 1/3y^(-2/3) dy/dx = 0 Then for dy/dx I got dy/dx = [-1/3x^(-2/3)] / [1/3y^(-2/3)] I think that from here I would use the quoti...

**english**

The high rate of eating disorders in the United States is mainly attributed to social factors such as media, cultural influences, and family factors. My questions is should it be, The high rate of eating disorders in the United States IS/ARE mainly attributed?

**math**

Suppose two dice (one red, one green) are rolled. Consider the following events. A: the red die shows 5. B: the numbers add to 4. C: at least one of the numbers is 3. D: the numbers do not add to 10. Express the event "The numbers do not add to 4." in symbols. 1 B D ...

**Probability**

f two indistinguishable dice are rolled, what is the probability of the event {(3, 3), (2, 3), (5, 3)}? 1 What is the corresponding event for a pair of distinguishable dice? 2 {(3, 3), (2, 3), (5, 3)} {(3, 3), (2, 3), (5, 3), (3, 5), (3, 2)} {(3, 3), (2, 2), (5, 5), (3, 5), (3...

**math probabilty**

Find the (theoretical) probability of the given event, assuming that the coins are distinguishable and fair, and that what is observed are the faces uppermost. Six coins are tossed; the result is at most one head.

**math**

Complete the following probability distribution table and then calculate the stated probabilities. Outcome a b c d e Probability 0.1 1Your answer is correct. 0.43 0.1 0.27 (a) P({a, c, e}). 2Your answer is correct. (b) P(E ∪ F), where E = {a, c, e} and F = {b, c, e}, P(E...

**Math Probability**

Find the (theoretical) probability of a given event, assuming that the dice are distinguishable and fair, and that what is observed are numbers uppermost. Two dice are rolled; the numbers add to 7. 1

**chemistry**

A 1-L flask is filled with 1.45 g of argon at 25 degrees C. A sample of ethane vapor is added to the same flask until the total pressure is 1.35 atm. What is the partial pressure of argon in the flask?

**math**

3y=4/5

**english**

which of the following genres is defined by form rather than theme: tragedy, sonnet, comedy, satire, or drama.

**geometry**

what is the answer to this; Alvan said that if 2 triangles are not congruent, then at least one of the 3 sides of one triangle is not congruent to the corresponding side of the other triangle. do you agree with alvan? justify your answer.

**PSY/202**

The issue that discusses whether development is more a function of biology or more a function of the environment is the ______________ controversy.

**chemistry**

I'm thinking Gd (element 64).

**math**

A poker hand consists of five cards from a standard deck of 52. Find the number of different poker hands of three of a kind (three of one denomination, one of another denomination, and one of a third). 1

**math**

A bag contains 3 red marbles, 2 green ones, 1 lavender one, 2 yellows, and 4 orange marbles. How many sets of four marbles include all the red ones? 1Your answer is incorrect.

**english**

help me find subjects and verbs in college sentences

**chemistry**

Find velocity of electron emitted by metal whose threshold frequency is 2.1*10^14 and when exposed to visible light wavelength of 5.09*10^-7

**physics**

Funny, I just got to this problem in my physics homework. Use the Conservation of angular momentum idea, L=Iw. You can find this with your given initial values. Then, you use that L in a new equation, except with the I final and w final (which you want to ultimately find). Use...

**math**

Alohaaaaaa

**bus math**

Meg's pension plan is an annuity with a guaranteed return of 7% interest per year (compounded monthly). She would like to retire with a pension of $20000 per month for 20 years. If she works 28 years before retiring, how much money must she and her employer deposit per mon...

**bus math**

Determine the selling price of a 15-year, 4.725% bond, with $1000 maturity value, with a yield of 4.735%. (Assume twice-yearly interest payments. Round your answer to the nearest cent.)

**psy**

Cathy owes six overdue movies to her local video store. Since each of Cathy’s overdue videos is a comedy, only comedies are currently overdue at Cathy’s local video store. Which one of the following premises, if added to the statements above, would allow the conclusi...

**physics**

where does the 4.9 come from?

**Math Approximation fractions**

I really don't understand how to determine which number is greater and which one is smaller can anyone help auorlda ?

**PHYSICS ---HELP!**

A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 6.2×10−5 rad. What diameter spot will it make on the Moon? Express your answer using two significant figures.

**math**

Urban Community College is planning to offer courses in Finite Math, Applied Calculus, and Computer Methods. Each section of Finite Math has 40 students and earns the college $40,000 in revenue. Each section of Applied Calculus has 40 students and earns the college $60,000, wh...

**math**

Find the intersection of the line through (0, 1) and (4.4, 2) and the line through (1.9, 3) and (5.3, 0). (Round your answers to the nearest tenth.) (x, y) =

**math**

You operate a gaming Web site, where users must pay a small fee to log on. When you charged $4 the demand was 510 log-ons per month. When you lowered the price to $3.50, the demand increased to 765 log-ons per month. (a) Construct a linear demand function for your web site and...

**physics**

A horizontal force of 20 N acted on a 10 kg mass at rest. The force accelerated the mass over a rough surface so that the mass had a speed of 6.0 m/s after 5.0 seconds. How much friction was acting on the mass?

**precalculus**

Find the dimensions of a square cardboard box (open top) that holds 100 cubic inches and is 4 inches deep?

**college pre-calc**

how do you know if there are holes in a rational function?

**Physics Help!!**

Three identical masses of 500 kg each are placed on the x axis. One mass is at x_1 = -11.0 cm, one is at the origin, and one is at x_2 = 37.0 cm. What is the magnitude of the net gravitational force F_grav on the mass at the origin due to the other two masses? Take the gravita...

**physics**

a patrol of timing paths each vehicle needs to travel the first half of the distance at a speed of 140 km / h. if the speed limit is 80km / h. which should be the highest average speed of the car in the second half of the section, to avoid being fined?

**physics**

a car crosses the street ABC. the segment AB = average speed of 60km / h for 2 hours, the length BC = average speed of 90km / h for 1 h. the average speed of car travel in AC is? the route is a straight line

**business math**

How long, to the nearest year, will it take an investment to triple if it is continuously compounded at 16% per year?

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

**math**

A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours. f(t) = 1

**Physics Help!!**

Suppose the kinetic energy of an object moving is 15 J and the potential energy is 25 J at some point in time. Then I measure the potential energy some time later and find it to be 10 J. What is the new kinetic energy?

**chemistry**

I think I'm doing the same lab as you. So what I did was find the new concentration of nitric acid in the solution (because by adding it to water, you've just diluted ur concentration). I got .167. Since nitric acid is a strong acid, it dissociates completely, right? S...

**college**

f(x) = 4 e**(5 x); f(x)=A b**x

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

**math**

if AX= kX k belongs to real numbers A=|4 -2| X=|x| |-2 4| |y| and x is not equal to cero, and cero is not equal to y, find k

**physics**

if AX = kX, k belongs to reals where A=|4 -2| <-(is a matrix) X=|x|<-(matrix) |-2 4| |y| and x is not equal to cero, cero is not equal to y, find k

**math**

Use exponential regression to model the price P(t) as a function of time t since 1994. Include a sketch of the points and the regression curve. (Round the coefficients to 3 decimal places.)

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

**physics**

for example of the stone dropped from a ballon and striking the ground and taking into account air resistance sketch a) a distance-time graph b) a velocity-time graph c)an acceleration-time graph

**math**

Find equations for exponential functions that pass through the given pair of points. (Round all coefficients to 4 decimal places if necessary.) (-2, 3) and (3, 4)

**math**

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

**math**

A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours.

**math**

Obtain exponential functions in the form f(t) = Aert, if f(t) is the value after t years of a $9,000 investment depreciating continuously at an annual rate of 8.5%. f(t) = 1

**physics! center of mass**

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

**physics! center of mass**

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

**langauge arts**

PASSAGE: How did one village bring disaster on itself? On a morning in early spring, 1873, the people of Oberfest left their houses and took refuge in the town hall. No one knows why precisely. A number of rumors had raced through the town during recent weeks, were passed on a...

**chemistry(FSU)**

3 is right! Thank you!! But how'd you get the answer?

**Math**

Im still confused. Wouldnt each side just be 0.33 m then?

**Math**

How would i determine that with only one value?

**Math**

The corners of a square lie on a circle of diameter 0.33 m. Each side of the square has length L. Find L.

**PHI103: Informal Logic **

eating candy will help his daughter improve in areas other than math

**PHI103: Informal Logic **

Barney’s lawsuit against Pinetree Café is unwarranted.

**math**

17 + 1 = 9(s) solve for s 18 = 9(s) s = 2

**math**

what do you divide 83 and 100 with to get to 5/6

**business hs**

positive attitude manners

**English fallacies**

my assignment is to find quotes from thimas jefferson's query 14 and label them according to fallacies and i just dont get it. some quotes include "Comparing them by their faculties of memory, reason, and imagination, it appears to me, that in memory they are equal to...

**Medical Billing and Coding**

Ok thank you This is what I had wrote: Healthcare, as it exists today, is an ever escalating, competitive process whereby providers and institutions thrive financially. If universal health care coverage were made available to all people, the competition among the providers and...

**Medical Billing and Coding**

Explain why the lack of universal health care coverage can raise health care costs.

**Medical Billing and Coding**

I have found the answer thank you to all who helped

**Medical Billing and Coding**

The investigational new drug (IND) application contains which of the following information?

**12th grade - Math**

Explain. 1.) To solve x(x-5)=0 either factor may be equal to zero. 2.) | 8-15i | = 17 3.) The solution for x^2 = -2 cannot be found graphically. [any help or explanation is greatly appreciated]

**12th grade - Math**

Identify the system as consistent, inconsistent or dependent. Explain your choice. 1.) 3x - 2y = 12 6x - 4y = 24 2.) x= -5 y= 4

**physics**

A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 72 hectares of land, down to a depth of 29 m, each year. What volume of earth, in cubic kilometers, is removed in this time?

**Math**

Solve for the indicated variable p I don't know what you do to solve it. A=P+Prt

**Physics - Uniform circular motion**

centripetal acceleration? v^2 / r = ac

**physics**

I actually used that formula and got that answer (35.625 m/s) but does that take into account the speed of the police car? (or is that a red herring)

**physics**

I actually used that formula and got that answer (35.625 m/s) but does that take into account the speed of the police car? (or is that a red herring)

**physics**

A speeding car is pulling away from a police car. The police car is moving at 30 m/s. The radar gun in the police car emits an electromagnetic wave with a frequency of 20.0 x 10^9 Hz. The wave reflects from the speeding car and returns to the police car where the frequency is ...

**Physics**

A 8.1 kg stone is at rest on a spring. The spring is compressed 12 cm by the stone. The stone is then pushed down an additional 27 cm and released. To what maximum height (in cm) does the stone rise from that position?

**algebra**

Substitute -21 into -x, which gives you -(-21). Two negatives make a positive, therefore -x = 21.

**math**

14 to 49

**hca/210**

What do you see as the purpose of health insurance? Should there be limits on the amount of health care provided? Word count met? If yes, what criteria should we use to ration health care? If no, how should health care be financed so that everyone has access?

**writing call**

In what ways are full-sentence outlines more beneficial than topic outlines? o Explain why it may or may not be simpler to write your paper instead of first creating a full-sentence outline. o What steps will you take to turn your outline into the body of your rough draft?

**university of phoenix**

I need to write a paper on the immigration law SB1070 in one week.

**essay**

I need to see if the paragraph I wrote is Ok?

**chemistry**

An enclosed cylinder has 3 moles of gas with a volume of 60 L and a temperature of 400 K. What is the pressure inside the container? Round to the nearest tenth. Don't forget the units.

**Chemisrty**

If you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1, what number or numbers could you change in order to balance the equation?

**math**

Find the measure of angle DBC if the measure of angle ABD is 36 degrees and the measure of angle ABC is 74 degrees.

**Chemistry**

Fe + 2HCl = FeCl2 + H2 A piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. The reaction formed hydrogen gas and iron chloride. How many grams of HCl were consumed? Don't forget the units.

**Government**

#1 is c.) socialism, communisn

**geometry**

Find the Pythagorean triple for m = 14

**healthcare**

list and describe the four steps necessary to establish the proper ICD-9-CM code.

**proviso**

how many grams of Fe2O3 are formed when 16.7g of Fe reacts completely with oxygen?

**question**

who gets to decide if you go to summer school?

**SOCIAL STUDIES! EMERGENY! HELP NEEDED!**

Trade between the two countries is relatively modest when compared to trade with their immediate continental neighbours, but still significant. France is Canada's seventh largest trading partner overall, and the third largest in Europe. Annual bilateral trade between the t...

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