Friday

October 28, 2016
Total # Posts: 916

**Chemistry**

Complete each ionic equation Cu+2 + SO4-2 + 4H2O ----> Ca+2 +2NO3-1 + 4H2O ----> 3K+1 +PO4-3 + 6H2O ----> Na+1 + Br-1 + 2H2O ----> 2Na+1 + S-2 + 2H2O -----> 2NH4+1 + CO3-3 + H2O ----> 2Na+1 + Cr-2 + 2H2O -----> Mg+2 + 2Br-1 + 4H2O -----> Na+1 + Cl-1 + ...

*April 28, 2012*

**Chemistry**

A mass of 0.4113 g of an unknown acid, HA, is titrated with NaOH. If the acid reacts with 28.10 mL of 0.1055 M NaOH, what is the molar mass of the acid?

*April 28, 2012*

**Chemistry**

If 0.150 moles of salicylic acid and execs acetic anhydride are used during a synthesis of aspirin, how many grams of aspirin will be obtained if the reaction gives a 38% yield?

*April 28, 2012*

**Chemistry**

The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many moles of uranium are in 6.0 moles of the following: Carnotite; K2(UO2)2(VO4)2*3H2O Uranophane; CaU2Si2O11*7H2O Autunite; Ca (UO2)2(PO4)2*10H2O

*April 23, 2012*

**economics**

In 1989, the Detroit Free Press and Detroit Daily News (the only daily newspapers in the city) obtained permission to merge under a special exemption from the antitrust laws. The merged firm continued to publish the two newspapers but was operated as a single entity. a. Before...

*April 20, 2012*

**Statistics**

Determine if a linear relationship exists between unemployment rates and cost of living indexes by constructing a scatter chart and adding a trend line. What is the regression model and R2?

*April 20, 2012*

**chemistry **

In the chemistry exp molar mass of a volatile liquid what will be the outcome if the hole in the aluminu foil was larger would it make the molar mass high or low. Or what will happen if yhr water vapors condensed under the aluminum foil before the final weighing

*April 10, 2012*

**chemistry **

A volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 253 mL. The temp of the water bath wad 100 °C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vaporous was 44.173g. Calculate the molar mass of the liquid

*April 10, 2012*

**Chemistry**

Titanium (6.94x10^-19) and silicon (7.77x10^-19) surfaces as irradiated with UV radiation with a wavelength of 231 nm. what is the wavelength of the electrons emitted by the titration surface?

*April 9, 2012*

**calculus**

Suppose lighthouse A is located at the origin and lighthouse B is located at coordinates (0,6). The captain of a ship has determined that the ship's distance from lighthouse A is 2 and its distance from lighthouse B is 5. What are the possible coordinates for the ship?

*April 2, 2012*

**Chemistry**

What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=5 to n=3?

*April 2, 2012*

**Math**

An unfair coin with Pr[H]=0.25 is flipped 95 times. A random variable X is defined as the number of heads that occur. Find the standard deviation. Any help??

*April 2, 2012*

**math**

if you have 6/24 and 18/72 and 3/12 it all reduces to 1/4

*April 2, 2012*

**Physics**

Work of 700 J is done by stirring an insulated beaker containing 110 g of water. (a) What is the change in the internal energy of the system? J (b) What is the change in the temperature of the water? °C

*March 30, 2012*

**Physics**

How much heat must be added to 30 g of water at an initial temperature of 62°C to completely convert the 100°C water to steam?

*March 30, 2012*

**Chemistry**

What about the iron (II) oxide? and the KOH?

*March 25, 2012*

**Chemistry**

I will do an experiment that includes 4 grams of aluminum hydroxide and iron (III) oxide mixture, where 75% of it is Al(OH)3, and 15 ml of water and 25 ml of 2M KOH will be added and then boiled so that the Al(OH)3 dissolves. It will be filtered and then sulfuric acid will be ...

*March 25, 2012*

**calculus**

4. A particle starts at the point (5, 0) at t = 0 and moves along the x-axis in such a way that at time t > 0 the velocity is given by v(t)=t/(1+t^2) a. Determine the maximum velocity attained by the particle. Justify your answer. b. Determine the position of the particle ...

*March 25, 2012*

**calculus**

1. A conical reservoir has a depth of 24 feet and a circular top of radius 12 feet. It is being filled so that the depth of water is increasing at a constant rate of 4 feet per hour. Determine the rate in cubic feet per hour at which water is entering the reservoir when the ...

*March 24, 2012*

**Physics**

How did you even get 3.081 m/s^2? I don't get it.

*March 16, 2012*

**Understanding psychology eighth edition**

verbal skills and muscular coordination have been observed to impruove women when

*March 14, 2012*

**Spanish-SRAJMcGin please check**

Could Sra JMcGin please check my answers to these questions if she has time? Thank you

*March 13, 2012*

**Spanish-3rd question**

I know what it means in English-I was wondering if it was correct in Spanish.

*March 13, 2012*

**Spanish-3rd question**

Thank you again for checking these-I couldn't number them or put question marks in front because jishka wouldn't accept them

*March 13, 2012*

**Spanish-3rd question**

Cuáles son de espectáculo que te gusta? El circo es el espectáculo que me gusta.

*March 13, 2012*

**Spanish-2nd answer**

I was wondering if they were correct in Spanish-I know what they mean in Englsih-I wrote the answers.

*March 13, 2012*

**Spanish-2nd answer**

¿Qué hace los actores en la ópera de teatro? Los actores juegan unos papeles en la obra de teatro. ¿Qué pasa hacer la semana próxima? Voy a la escuela la semana próxima ¿Qué hiciste la semana pasada? Hice mi tarea ...

*March 13, 2012*

**Spanish**

I have to post the questions separately with my answers or they won't accept them-I'm really sorry it keeps saying URL so I will have multiple listings Thank you for checking

*March 13, 2012*

**Spanish**

Please check this Cuáles son algunos comidas típicos de Mexico? Algunos comidas típicos de Mexico son tacos, y enchiladas y frijoles.

*March 13, 2012*

**Spanish-Plase check**

Thank you for responding-these negatives still really confuse me but thank you so much for responding

*March 12, 2012*

**Spanish-Plase check**

Thank you I appreciate it

*March 12, 2012*

**Spanish-Plase check**

I couldn't number them-it wouldn't take that way so I deleted the numbering thank you for checking

*March 12, 2012*

**Spanish-Plase check**

I had to make some negative sentences. Please check Thank you No tengo nada que hacer. No bebo nunca el batido. No bailo nunca. No hablo nunca francés. Tampoco hablo el alemán No compro ninguno. No quiero comer nada No quiero nunca contestar en la clase. Nadie ...

*March 12, 2012*

**calculus**

Find the area of the region bounded by the graph of y^3=x^3 and the chord joining the points (-1, 1) and (8,4)

*March 11, 2012*

**calculus**

Which of the following are antiderivatives of f(x)=sinxcosx? I f(x)=(sin^2* x)/2 II f(x)=(cos^2* x)/2 III f(x)=-cos(2x)/4

*March 11, 2012*

**Spanish**

Thank you

*March 11, 2012*

**Spanish**

I had to answer the questions in the negative please check 1.Hay alguien en la puerta? No, no hay nadie en la puerta. 2. Hay algo en la mesa? No, no hay nada en la mesa.

*March 11, 2012*

**math**

how do you make 87 cents with 6 coins none of which are half dollars

*March 1, 2012*

**Chemistry**

The specific heat of solid copper is 0.385 J/g*C. What thermal energy change occurs when the temperature of a 40.10g sample of copper is cooled from 42.9C to 10.0C? Be sure to give you answer the proper sign. I know this is part of the answer which (42.9-10.0)*40.10*0.385=508 ...

*February 27, 2012*

**Chemistry**

The specific heat of solid copper is 0.385 J/g*C. What thermal energy change occurs when the temperature of a 40.10g sample of copper is cooled from 42.9C to 10.0C? Be sure to give you answer the proper sign. I know this is part of the answer which (42.9-10.0)*40.10*0.385=508 ...

*February 27, 2012*

**math**

how do you format hours/day-percentage of time spent during an 8 hour work day ?

*February 24, 2012*

**Chemistry**

A compound containing only C, H, and O was extracted from the bark of the sassafras tree. The combustion of 36.3mg produced 98.6 of CO2 and 20.2mg of H2O. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular formulas

*February 19, 2012*

**Chemistry**

A compound containing only C, H, and O was extracted from the bark of the sassafras tree. The combustion of 36.3mg produced 98.6 of CO2 and 20.2mg of H2O. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular formulas

*February 19, 2012*

**pre-calculus**

What is the domain of (x+2)/(x-2)?

*February 15, 2012*

**Philosophy: Introduction to Logic**

1.) (L=N) > C 2.) (L=N) v (P>~E) 3.) ~E > C 4.) ~C /~P

*February 13, 2012*

**statistics**

Assume that the population of heights of female college students is approximately normally distributed with mean m of 66 inches and standard deviation s of 4.00 inches. Show all work. (A) Find the proportion of female college students whose height is greater than 65 inches. (...

*February 12, 2012*

**spanish**

In the following sentences, change the position of the reflexive pronouns so that sentences retain their meaning. Have the correct account punctuation and accentuation. 1. Ellos vienen a despedirse esta noche 2. Daniel se esta afeitando 3. Patricia va a ponrse muy contenta. 4...

*February 8, 2012*

**Chemistry**

Write and balance equation for the complete combustion of decane, C10H22

*February 8, 2012*

**Physics**

A freight train has a mass of 1.7 107 kg. If the locomotive can exert a constant pull of 7.6 105 N, how long does it take to increase the speed of the train from rest to 64 km/h?

*February 1, 2012*

**Chemistry**

Could the answer be fluorine

*January 31, 2012*

**Chemistry**

I have a question I want to make sure I'm going in the right direction. The question states give a diatomic element which is not a gas could the answer be any of the noble gases

*January 31, 2012*

**Chemistry**

I'm looking for the missing information in the table symbol- number of protons-36 number of neutrons-42 number of electrons- mass number-

*January 25, 2012*

**Chemistry**

Fill in the missing information in the following table of four neutral atoms Symbol- 37Cl number of protons- 36 46 number of neutrons- 42 number of electrons- 33 mass number- 77 106

*January 25, 2012*

**Account Recievables**

You notice that your accounts receivable days outstanding has doubled in the first 6 months. Do you give someone a bonus or put him or her on probation? Why?

*January 24, 2012*

**Chemistry**

Give the formula of each of the following copper minerals: A. cuprite, copper (I) oxide B. chalcocite, copper (I) sulfide C. covellite, copper (II) sulfide

*January 23, 2012*

**Chemistry**

heptane and water do not mix, and heptane has a lower density (0.684g/mL) than water (1.00g/mL). A 100mL graduate cylinder with an inside diameter of 3.10 cm contains 39.90g of heptane and 34.00g of water. What is the combined height of the two liquid layers in the cylindar? I...

*January 21, 2012*

**Chemistry**

the answer that I got once I multiply it is 51.3

*January 20, 2012*

**Chemistry**

would you multiply 0.789 x 65.0?

*January 20, 2012*

**calc**

If f (3) = 9 and f ´(3) = 4, find the tangent line to the graph of f when x = 3.

*December 28, 2011*

**CALC**

The radius in meters of a circular oil slick increases at a rate of (12 - 0.3t), where t is measured in hours. Which of the following expressions would calculate the rate at which the area of the oil slick is increasing when the radius is 100 meters?

*December 28, 2011*

**CALC**

Find the tangent line to the ellipse defined by 3x^2 + 5y^2 = 17 at the point (-2, 1).

*December 28, 2011*

**Medical Billing**

278.01,

*December 14, 2011*

**chemistry**

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94, and shows prominent peaks in its IR spectrum at 3600–3200 and 1600 cm–1? A) The compound has a molecular mass of 94. B) The compound ...

*December 11, 2011*

**chemistry**

What type of feature will be observed in the EI mass spectrum of chlorobenzene? An absorption at 3100 cm–1 No signal at all A signal at 112 and a signal at 114 in a ratio of 3:1 A signal at 112 and a signal at 114 in a ratio of 1:1

*December 11, 2011*

**sociology**

Define urbanization and suburbanization. What are some ways that urbanization and suburbanization contribute to social problems?

*December 1, 2011*

**Math**

I need help on this??

*December 1, 2011*

**Math**

What is a3-1=? The 3 post to be on top of the a a little bit

*December 1, 2011*

**Statistics**

1-.02=2.33=z-value plug into the equation [(2.33)^2*.5*.5]/(.02)^2 3393.06

*October 26, 2011*

**MATH(convert fraction)**

so 3/8 is 16 centi on a scale and what is 3/4 on a scale?

*October 18, 2011*

**convert fraction**

so 3/8 is 16 centi on a scale and what is 3/4 on a scale?

*October 18, 2011*

**MATh please help**

Helen has$1.35 in her bank in nickels and dimes. There are 9 more nickels than dimes. Find the number she has of each kind.

*October 18, 2011*

**math help please**

Helen has$1.35 in her bank in nickels and dimes. There are 9 more nickels than dimes. Find the number she has of each kind.

*October 18, 2011*

**MATH (PLease HELp)**

Sally has three times as many dimes as nickels and twice as many quarters as dimes.In all she has $5.55. How many coins of each type does she have? Let 2x=quarters 3x=dimes x=nickles <---- is that correct please help put

*October 18, 2011*

**ALGEBRA-Help please**

x+3y=4 -x -x ALWAYS X means 1 3y=4 divide by 4 y=1

*October 13, 2011*

**MATh**

Distance = rate x time

*October 13, 2011*

**MATh**

Kesha dove from Buffalo to Syracuse at an average rate of 48miles per hour. On the return trip along the same road she was able to travel at an average rate of 60 miles per hour.The trip from Buffalo to Syracuse took one- half hour longer than the return trip. How long did the...

*October 13, 2011*

**MATh (distance)**

Kesha dove from Buffalo to Syracuse at an average rate of 48miles per hour. On the return trip along the same road she was able to travel at an average rate of 60 miles per hour.The trip from Buffalo to Syracuse took one- half hour longer than the return trip. How long did the...

*October 13, 2011*

**Social Studies (civilizations)**

How was the Persian empire was different from the Assyrian Empire?

*October 10, 2011*

**MATh ( translate words into number)**

k thx got it

*October 10, 2011*

**MATh ( translate words into number)**

40. The greater of two numbers is 1 ore than twice the smaller. Three times the greater exceeds 5 times the smaller by 10. Find the numbers. How do i start please explain. WHere do i start and how to do do this. AM very confused.

*October 10, 2011*

**MAth translate please thx **

If 5 times the smaller of two numbers is subtracted from twice the larger the result is 16. If the larger is increased by 3 times the smaller, the result is 63. Find the numbers.

*October 10, 2011*

**Math - translate (please check)**

4. The sum of two numbers is 50. If twice the larger is subtracted from 4 times the smaller the result is 8. Find the numbers is it this x+x(2x-4=8)=50

*October 10, 2011*

**Theme please check **

thanks

*October 9, 2011*

**Theme please check **

the story is A piece of Pie by Damon it was mistake for posting it two times

*October 9, 2011*

**Theme please check **

Could the theme be No women could change men The story is about a man marrying a women and the women wants the man changing his diet. The women bosses him around then the man finds another girl and takes off with her. He took off with her because the women bossed him around ...

*October 9, 2011*

**Social Studies Help!!!!!!!**

how did mercantilism affect different cultures?

*October 6, 2011*

**meaning**

The Thar Desert provide the majority of India's rainfall.. Does this mean that the thar desert prevents rain

*October 6, 2011*

**chemistry**

How many moles of sodium bicarbonate are contained in 1mL of a saturated solution of NaHCO3 (approximately 1g of solute is dissolved per 9mL solution)?

*October 5, 2011*

**English Help!!!!**

Could you tell me about a person who dominated the poor and uneducated.

*October 5, 2011*

**physics**

At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s2. At this rate, how long does it take to accelerate from 76 km/h to 118 km/h

*September 22, 2011*

**math**

using limits...finding the tangent line of the square root of x when x=2

*September 22, 2011*

**Algebra**

One is traveling 360 mph and the other is traveling 390 mph.

*September 19, 2011*

**chem**

How many gold atoms are in an 0.408 ounce, 18 gold bracelet? (18 gold is 75% gold by mass.)

*September 19, 2011*

**Com/155**

I want to know how it affect your paper

*September 16, 2011*

**3rd grade math**

Ashton broke apart a number into 30+7. What number did she start with?

*September 6, 2011*

**information litercy **

what type of citation would you use for an english paper? 1.ASA 2.Chicago 3.MLA

*August 23, 2011*

**geometry**

Write a two column proof. Given CE = CA, EB and AD are medians, Prove: EB = AD for a triangle

*July 27, 2011*

**Psychology**

Construction

*July 27, 2011*

**science**

Question: If you have an electric motor on a bench and hook it to the power the shaft turns. If you put the shaft in a vise the casing of the motor will turn. Now:...put this motor in free space no gravity and attach a battery for power..when the power is turned on will the ...

*July 25, 2011*

**physics**

1*500*80+500*540= 310,000 J

*July 5, 2011*