Thursday

October 30, 2014

October 30, 2014

Total # Posts: 3,758

**Chemistry**

Why is the last step is convert to pH? We are trying to find the hydroxide-ion concentration?not the pH
*March 22, 2013*

**Chemistry**

what is the hydronium-ion concentration in a 0.35m solution of NaCO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11. (Kw=1.0x10^-14)
*March 22, 2013*

**Chemistry**

I don't press the E button i press the 10^x Button but when I divided the kw/Kb it gives me 2.083x10^-28
*March 22, 2013*

**Chemistry**

I plug in the numbers put it doesn't match any of the choices.... I get 4.81x10^-29 The choices are A)2.3x10^-35 B)6.4x10^-23 C)7.3x10^-16 D)48 E)491 Please help!!
*March 22, 2013*

**Chemistry**

What is Kc for the following equilibrium? For phosphoric acid, Ka1=6.9x10^-3, Ka2=6.2x10^-8 and Ka3=4.8x10^-13 HPO4^-2 + OH^- <==> PO4^-3 + H2O
*March 22, 2013*

**physics**

Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg. B)Calculate the magnitude of...
*March 22, 2013*

**english**

complete the sentence please! a kite___ tries to catch a falling kite before it lands.
*March 21, 2013*

**chemistry**

How many mL of 0.40M NaOH are need to neutralize 30.0 mL of 0.50 M H2SO4 according to the following reaction. 2NaOH(aq) + H2SO4 (aq)----Na2SO4 (aq) + 2H2O(l)
*March 20, 2013*

**English**

Which senses are appealed to in these lines from Macbeth? Nay, had I pow'r, I should / Pour the sweet milk of concord into hell, / Uproar the universal peace… A. smell, taste, and touch B. hearing, sight, and smell C. sight, taste, and hearing D. hearing, taste, and ...
*March 20, 2013*

**Childhood**

Thanks :)))
*March 19, 2013*

**Childhood**

Two most common aspects of malnutrition in the u.s are: a) heart disease and obesity b) iron deficiency and heart disease c) dental decay and iron deficiency d) obesity and dental decay. I chose c) dental and iron deficiency is that right?
*March 19, 2013*

**curriculum development**

I'm using notes and Internet not text, I can't find much info
*March 19, 2013*

**Childhood**

The fundamental purpose of early childhood education should be to a) prepare children for continuing later success in elementary school. B) foster growth of developmental sequences c) foster competence in dealing with life .is letter c) correct?
*March 19, 2013*

**Chemistry**

I could use some help please. Ammmonia, NH3, can be made by reacting Nitrogen with Hydrogen. N2+3H2=2NH3 How many moles of NH3 can be made if 7.5 moles of H2 react eith enough N2? Thank-you in advance for any help
*March 18, 2013*

**College algebra**

Find the value of f(x) = -3x^2 + 12x-8
*March 15, 2013*

**Find the following inequality**

Find the following inequality. 15(x^2-1)>16x
*March 15, 2013*

**accounting**

13. A drawback to using _______ when inventory costs are rising is that the company reports lower net income. A. LIFO B. FIFO C. specific-identification costing D. average costing 14. The balance sheet format that lists assets
*March 12, 2013*

**Math**

what is a model that shows 180 divided by 9
*March 11, 2013*

**MATH**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
*March 10, 2013*

**math**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
*March 10, 2013*

**math**

2x+3y=13 5x+2y=16
*March 10, 2013*

**Math**

If you have 36ft of fencing what are the areas of the different rectangles you could enclose with the fencing? Consider only whole number dimensions.
*March 7, 2013*

**chem**

Calculate the pH of a solution made by adding 3.20 g of lithium oxide (Li2O) to enough water to make 1.210 L of solution. (Kw = 1.0 10-14)
*March 7, 2013*

**chemistry**

i did what you told me to and had to use the quadratic and got 1.430e-6 for the OH- but it was wrong. is that what you got?
*March 6, 2013*

**chemistry**

Calculate the hydronium ion concentration and pH in a 0.037 M solution of sodium formate, NaHCO2. hydronium ion concentration i dont understand these
*March 6, 2013*

**chem**

select the stronger base. how do i know this? 1.SeO42− or SO42− 2.BrO− or BrO2−
*March 6, 2013*

**physics**

Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to ...
*March 5, 2013*

**physics**

Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to ...
*March 5, 2013*

**Physics**

A 1200.0-kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?
*March 5, 2013*

**chemistry**

Calculate the molar concentration of OH− ions in an 1.79 M solution of hypobromite ion (BrO−; Kb = 4.0 10-6).
*March 4, 2013*

**Math...I think...**

A building casts a shadow 54 feet long at the same time a 6 foot tall man casts a shadow 4 feet long. How tall is the tree?
*March 1, 2013*

**Finance**

CAN SOMEONE PLEASE PLEASE HELP ME WITH A FINANCE QUESTION THAT I POSTED YESTERDAY,WEDNESDAY,FEB 27TH @ 5:58PM.PLAEASE,ANY AND ALL HELP WILL BE GREATLY APPRECIATED
*February 28, 2013*

**physics**

a chinook salmon
*February 28, 2013*

**physics**

a moving walkway at an airport has a speed v1 and a length l. a woman stands on the walkway as it moves while the man in a hurry to reach his flight walks on the walkway with a speed of v2 relative to the moving walkway. how long does it take the woman to travel the distance l.
*February 28, 2013*

**social studies**

what injuries did they get in the lowell Massachusetts textile mills ? what did the implorers do about it ?
*February 27, 2013*

**Finance**

Please help me,math word problems make my brain go crazy. Some friends are urging you to chip in with them to buy a vacant parcel og land on the outskirts of your city. A one-fourth interest would cost you $10,000.Total annual expenses on the property are $2,200.When the ...
*February 27, 2013*

**statistic**

At a party there are 33 students over age 21 and 22 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.. You have given every student at the party the same chance to be ...
*February 27, 2013*

**o.chem**

how would doubling the concentration of the nucleophile affect the rate of an sn2 reaction?
*February 26, 2013*

**calc 2**

A computer takes 2 seconds to compute a particular definite integral accurate to 4 decimal places. Approximately how long does it take the computer to get 12 decimal places of accuracy using each of the LEFT, MID, and SIMP rules? Round your answers to one decimal place. (a) ...
*February 25, 2013*

**chemistry**

how is it possible for the same element to be oxidized in one reaction and reduced in another?
*February 24, 2013*

**medical physics**

Rx = 3000 cGy in 10 fractions, whole brain Rt and Lt laterals, KD Siemens 6x. The collimator is set for 22 X 16 cm2 portal films at 92.5 cm SSD. Calculate the treatment port MU to isocenter. Calibration performed std. SAD; treatment performed SSD (assume SSDs at the calc point...
*February 20, 2013*

**calculus!!!**

Find the integral of: 2xsqrt(x+1) dx
*February 20, 2013*

**calculus**

Find the integral of: (x+2)/(x^3+2x^2-3x)dx
*February 20, 2013*

**math**

If a person runs 5 miles in 1 hour, how far will they run in 5 minutes?
*February 19, 2013*

**math**

) The circle graph below gives the inventory of the women's department of a store. Coats $49,737 Dresses $47,208 Skirts Lingerie $9273 $5058 Slacks Socks $15,174 Blouses $2529 $5901 What is the total inventory?
*February 17, 2013*

**Finance**

Would anyone be able to help me out please? You buy 100 shares of XYZ at $40per share.XYZ pays an annual dividend of $2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 yrs and that the stock will increase 5% each...
*February 17, 2013*

**Life orientation**

Hi Sello.I worked in management for yrs so I hope this helps you. There is several laws protecting the employee in the work force. 1]The Federal Civil Rights Act of 1964 prohibits employers from discriminating against job seekers and employees on the basis of race,religion,sex...
*February 17, 2013*

**Finance**

I've posted this question once already and really need help. You buy 100 shares of XYZ at $40 per share.XZ pays an annual dividend of $2.00 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the ...
*February 15, 2013*

**Financial**

You buy 100 shares of XYZ at $40 per share.XYZ pays an annual dividend of $2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the stock will increase 5% each year.How much will your XYZ investment ...
*February 14, 2013*

**Chemistry**

The solubility of nitrogen in water is 6.9 x 10^-4 at exactly 1 atm pressure. What is the solubility of nitrogen under .80 atmp pressure? I don't know where to start with this problem, what formula do I use?
*February 13, 2013*

**chemistry**

how would that help trying a new solvent? i dont understand why the recovery would be so poor, do you know?
*February 11, 2013*

**chemistry**

a student dissolves 80 mg of a crude product in 4.5 mL( the minimum required) of methanol at 25 deg C . She cools the solution in an ice bath and obtains crystals. The crystals are recovered by filtration and rinsed with 0.5 mL of ice-cold methanol. After drying, the weight of...
*February 11, 2013*

**calculus**

Find the integral of (tan x)^2 sec(x)dx
*February 11, 2013*

**calculus**

Find the integral of: dx/(x^2-4x)
*February 11, 2013*

**chemistry**

I got x= 8.88 g the second extraction you mean the same solve, that means I should do 8.88+8.88= total of z?
*February 9, 2013*

**chemistry**

Suppose a compound Z had a partition coefficient of 8.0 in ether-water. If 10.0 g of Z was dissolved in 100 mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions. show your calculation. a) What is the total ...
*February 9, 2013*

**Chemistry**

what conditions are shared by cities that suffer from photochemical smog?
*February 6, 2013*

**PLEASE CHECK THESE ANSWERS AMERICAN GOV**

1. Question : The purpose of the War Powers Act is to Student Answer: INCORRECT allow the Commander in Chief to issue informal declarations of war. to grant the President unlimited military powers. grant Congress equal military power with the President. CORRECT ensure ...
*February 3, 2013*

**Chemistry**

54.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 165 mL of water. What is the final concentration?
*February 2, 2013*

**PHYSICS**

Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 93 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of ...
*February 1, 2013*

**PHYSICS**

Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
*February 1, 2013*

**PHYSICS**

During heavy rain, a section of a mountainside measuring 5.4 km horizontally (perpendicular to the slope) 0.80 km up along the slope, and 2.1 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley ...
*February 1, 2013*

**math**

what is formula to show how much time it took car to travel 7km is .4hrs
*January 30, 2013*

**medical transcription 2**

I need help finding an answer in the Diagnostic imaging/interventional radiology TE #13, which is MRI brain for Edgar jorda. The part where it says: "The ________ appears minimally changed from the study..."
*January 24, 2013*

**Physics**

Q1 and Q2 are charged objects of the same sign separated by a distance 29.9 m. If you place another charged object (Q3) a distance 8.0 m from Q2 along a direct line between Q1 and Q2, it experiences no net electric field. So, if the magnitude of Q2 = 9.3 C, what is the ...
*January 23, 2013*

**physics**

In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the ...
*January 23, 2013*

**Math**

This table gives the number of AIDS cases reported in men in Los Angeles from 1983-1989: Month and Year of Diagnosis AIDS cases reported in period Jan-June 83 116 July-Dec 83 154 Jan-June 84 197 July Dec 84 269 Jan-June 85 415 July-Dec 85 503 Jan-June 86 668 July-Dec 86 773 ...
*January 23, 2013*

**math**

What are the basic elements of an effective medical office financial policy?
*January 23, 2013*

**chem**

for 2Al2O3----> 4Al(s) + 3O2 the question is what is the heat change for the formation of 1 mol of aluminum oxide from its elements? Al2O3:-1676.0 O2:0.0 Can someone please explain how to complete this problem step by step please??
*January 22, 2013*

**Math**

Write an equation: x varies directly as y and inversly directly to the cube of Z
*January 21, 2013*

**Health**

Thank you so very much. These websites are a great help to me.
*January 19, 2013*

**Health**

I have to create a nursing case study. I have everything I need, but am not sure how to present it. Details: 67 year old causcasain male diagnosed with emphysema returns with shortness of breath, etc. supposedly associated with CHF. Have to have everything including ABCD ...
*January 19, 2013*

**Chemistry**

A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
*January 16, 2013*

**Chemistry**

A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
*January 16, 2013*

**Chemistry**

I'm supposed to compare the percent composition of gases in the atmosphere at sea level to the percent composition at high altitude.. Would the percents decrease? I don't really understand
*January 16, 2013*

**Chemistry**

explain why a sealed bag of potato chips "puffs out" (increases in volume) if taken from sea level to a high mountain pass. I know this has to do with pressure.. so is it because the higher up you go, the less pressure there is? Thanks!
*January 16, 2013*

**bio**

The most common protein secondary structures (the alpha helix and beta conformation) are stabilized primarily by A. ionic bonds B. hydrogen bonds C. disulfide bonds D. van der Waals interactions E. hydrophobic interactions
*January 16, 2013*

**integrated math**

Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days.?
*January 15, 2013*

**Chemistry**

Just having some trouble with this chemistry problem.. Thanks for help! Toxic carbon monoxide (CO) gas is produced when fossil fuels such as petroleum burn without enough oxygen. The CO can eventually be converted to CO2 in the atmosphere. Automobile catalytic converters are ...
*January 15, 2013*

**Chemistry**

What volume would be occupied at 0°C and 1 atm by 3 mol CO₂(g)? I just might need someone to help me work this out, I would greatly appreciate it! I don't understand this chemistry problem.
*January 15, 2013*

**Physics**

i think d
*January 15, 2013*

**math**

a ball is dropped from a height of 10 ft. if the ball's height after t sec is modeled by the following equation h(t)=-16t^2+10. when does the ball hit the ground?
*January 15, 2013*

**math**

Roses were planted 100 cm apart around a rectangular garden. There were no roses at the corners. They started 1 m from each corner. The garden was 5 m by 3 m. How many roses were planted?
*January 15, 2013*

**Chemistry**

Assume that the LHMP is enclosed in a transparent polymer stucture. a. How will the gases inside LHMP be affected by hot days and cool nights? b. What design features might be incorporated in the LHMP to reduce those heating and cooling effects? I know that gases expand in ...
*January 13, 2013*

**Chemistry**

In planning to administer a gaseous anesthetic to a patient, a. Why must the anesthesiologist take into account the fact that during surgery the gaseous anesthetic is used both at room (18 degrees C) and the patient's body temperature (37 degrees C)? The warmer the ...
*January 13, 2013*

**Chemistry**

If a sample of gas is cooled at a constant pressure until it shrinks to one-fourth its initial volume, what change in its kelvin temperature must have occurred?
*January 13, 2013*

**Algebra**

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
*January 13, 2013*

**Algebra**

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
*January 13, 2013*

**Algebra**

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
*January 13, 2013*

**Algebra**

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
*January 13, 2013*

**Math**

Name the lengths of the sides of three rectangles with a perimeter of 12 units. Use only whole numbers
*January 9, 2013*

**Physical science**

Compute the gravitational force between two 1.00 kg lead spheres whose centers are 1.00 m apart?
*January 6, 2013*

**physics**

Ceres is a dwarf planet located in the asteroid belt between the orbits of mars and Jupiter. the radius of Ceres is 4.76 x 10^5 m. suppose an astronauts stands on the surface of Ceres and drops a 0.85 kg hammer from a height of 1.25 m. the hammer takes 3.0 to reach the ground...
*January 5, 2013*

**Algebra**

8s+ 12 = 16, 6s+ 9t = 12 solve by substitution
*December 8, 2012*

**French**

1. J'utilise un ventilateur quand il fait chaud. 2. Je n'utilise pas le congélateur si j'ai froid. 3. Il ya une couverture sur mon lit. 4. Mes livres sont sur l'étagère. 5. Je mets mes vêtements dans l'armoire. 6. ...
*December 4, 2012*

**French**

1. J'utilise un ventilateur quand il fait chaud. 2. Je n'utilise pas le congélateur si j'ai froid. 3. Il ya une couverture sur mon lit. 4. Mes livres sont sur l'étagère. 5. Je mets mes vêtements dans l'armoire. 6. ...
*December 4, 2012*

**science**

Fast help Please Hurry!!!!!!!!!!!!!!!!!!!!!! A bicyclist is in a 50-km race. He says he had an average velocity of 35. What is missing in the cyclist’s velocity? A. units only B. units and distance C. direction only D. units and direction
*December 3, 2012*

**science**

Thanks so much!
*December 3, 2012*

**science**

im blank today please help thanks!!!!!!!!!!! It takes a car 1.75 h to go from mile marker 10 to mile marker 115. What is the average speed of the car? A. 1.6 mph B. 60 mph C. 65 mph D. 183 mph
*December 3, 2012*

**Algebra2**

Check? Give the slope and y-intercept of the given line. 1. 2x-3y=6 = 3y = 2x-6 y = 2/3 x - 2 2. y=-2x = 2/1x + 1 3. y=3 = y=3/1x + 3 3y = 2x-6 y = 2/3 x - 2
*November 29, 2012*

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