Tuesday

February 21, 2017
Total # Posts: 1,589

**chemistry**

The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for titration The ...

*March 12, 2012*

**Chemistry**

[H2O]=1M

*March 9, 2012*

**trig**

find the general solutions to the equations: 1) sec x = -2 2) 2 sin^2 x = 1 3) cos^2 x - 2cos x + 1 = 0

*March 5, 2012*

**Chemistry**

I was wondering if anyone could describe a general Friedel-Crafts alkylation to me. I understand that it involves the substitution of an aromatic ring with an alkyl group using a strong Lewis acid catalyst. But, what types of activating groups are present on the ring? What'...

*March 1, 2012*

**Math- Exponent Laws.**

Simplify, "put the power into a single positive exponent." -(-2)^0*(-2)^3*(-2)^-4/(-2)^3 please help I am so lost on how to solve this problem!! I have been trying to figure it out for days. the - in front of the (-2) is very confusing.

*February 29, 2012*

**Science**

Where the animal first starts to deposit fat?

*February 27, 2012*

**Chemistry**

An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is -12.9 Farenheit. Kf H2O = 1.86 Celsius/m

*February 24, 2012*

**chemistry**

For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 21, 2012*

**physics**

For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 21, 2012*

**physics**

can someone please explain f1d1 = f2d2

*February 21, 2012*

**Physics**

Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C .

*February 17, 2012*

**chemistry**

i just had sex and it felt so good.

*February 17, 2012*

**chemistry**

I don't have answers could u still try to help me

*February 16, 2012*

**chemistry**

Q1) For the reaction, A to B, Delta H= +11.00 kJ mol-1 and Keq is 12.50 Calculate i) delta G and ii) delta S at 25 C (degrees celcius) 0 C degrees celcius = 273.15 K; R = 8.314 J K-1 mol-1] PLease help dr bob222

*February 16, 2012*

**chemistry**

Q1) For the reaction, A to B, Delta H= +11.00 kJ mol-1 and Keq is 12.50 Calculate i) delta G and ii) delta S at 25 C (degrees celcius) 0 C degrees celcius = 273.15 K; R = 8.314 J K-1 mol-1]

*February 15, 2012*

**chemistry**

Q1) For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 15, 2012*

**grammar**

Hyphens are so confusing, so I'm asking for a little help. 2. Select the sentence which is correctly punctuated. A) He came in for his follow up. B) He came in for his followup. My answer: B 4. Select the sentence which is correctly punctuated. A) He will follow-up in 4 ...

*February 14, 2012*

**chemistry**

Q1) For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 14, 2012*

**Chemistry**

Is there any way to increase the ionic strength of a solution without increasing the pH?

*February 12, 2012*

**Tourism**

why is it important that the sport industry and the tourism industry have a good relationship? And what is the relationship between them?

*February 10, 2012*

**Physics**

An enemy ship is on the western side of a mountain island. The enemy ship can maneuver to within 2520 m of the 1850 m high mountain peak and can shoot projectiles with an initial speed of 260 m/s. If the eastern shoreline is horizontally 305 m from the peak, what is the ...

*February 5, 2012*

**Math**

a bracelet is to be made from 2 red and 5 blue beads. how many different bracelets can be made

*January 29, 2012*

**Math**

The number of library books in a school increased by 20% after it bought new books in may. The number increased by another 20% after a bookstore donated 300 books in June. Find the number of books in the library before it bought new books in May.

*January 26, 2012*

**Punctuation & Grammar**

She is a pleasant 18-year-old female who states that she was at a pub where she was eating and actually fell while holding a tray and rolled her ankle. A) complete sentence B) fragment C) run-on My first thought is C) run-on, but I always second guess myself. Now I think it ...

*January 25, 2012*

**Stat**

a large no. of bonobos were found to be normally distributed with a mean of 46 and a variance equal to 9. if each of their scored is increased by 5 points, what percentage of the new scores is less than 50?

*January 17, 2012*

**physics**

A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.350 rev/s. What is its angular velocity after a 28.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.

*January 16, 2012*

**Math (algebra)**

86

*January 11, 2012*

**physics**

need help can someone please tell me Electricity is often converted into other forms of energy. List 3 examples.

*January 5, 2012*

**7th physics**

baloonist drops rock from balloon. takes 7 seconds for the rock to fall. what's the balloonist's altitude in feet?

*January 5, 2012*

**Math**

Tomas put $180 in an account earning simple interest. At the end of one year, the account had $186.30 in it. Assuming no additional deposits or withdrawals, what was the interest rate being paid? I really need help!

*January 3, 2012*

**math**

That is easy. Now put 0.75 in a fraction and redouce it: 75/100= 3/4 Than 0.2: 2/10= 1/5 8/10= 4/5 Now they are all fractions. so it should be this: 3/4,1/5,4/5.

*January 3, 2012*

**chemistry**

b. Methanol, CH3OH, which can be used as a fuel, can be formed by the reaction between carbon monoxide and hydrogen as depicted in the following balanced equation. 2H2 + CO ¨ CH3OH Suppose 356 g of CO and 65 g of H2 are mixed and allowed to react. (i) Which species ...

*December 28, 2011*

**physics**

thanks alot :D i got 3s for t for part 2!! nd i got 17.1s for part1 is dat correct??

*December 22, 2011*

**physics**

Driving in a car with a constant velocity of 11.4 m/s you suddenly see an obstacle ahead. Immediately applying the brakes the car slows with an acceleration of 3.80 m/s2. (i) Calculate the stopping distance of the car, and (ii) the time taken to stop.

*December 22, 2011*

**chemistry**

n=m divided by mr n=25 divided by mr of nacl 23+35.5 n=c*v

*December 13, 2011*

**chemistry**

can you find them for me

*December 13, 2011*

**chemistry**

yeas it is a mean mass ratio could you show me how to do it Bob Pursley

*December 13, 2011*

**chemistry**

Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 . What volume of compound D is to be added? ''DR BOB 222 IT IS A GRAMS RATIO'...

*December 13, 2011*

**chemistry**

The ratio of 4:1 by moles DrBob222

*December 8, 2011*

**chemistry**

moles please show me the steps on how to do it thanks

*December 8, 2011*

**chemistry**

please help

*December 8, 2011*

**chemistry**

6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1. What volume of compound D is to be added?

*December 8, 2011*

**chemistry**

5. Compound A has a MW of 283. 0.423g of Compound A is dissolved in 13.5mL of water and 1mL of the solution added to 5mL of water to produce “solution A”. What is the concentration of Compound A in “solution A”?

*December 8, 2011*

**chemistry**

4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...

*December 8, 2011*

**chemistry**

4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...

*December 8, 2011*

**chemistry**

1. NaOH has a MW of 40. A 0.12M solution is made by adding how much NaOH to 100mL of water?

*December 8, 2011*

**chemistry**

2. 2mL of a 10M solution of Compound A is taken and 48mL added. 1mL of this solution is then taken and dried to dryness before being re-dissolved in 0.1mL. What is the concentration of the 0.1mL solution?

*December 8, 2011*

**chemistry**

Thank you

*December 8, 2011*

**chemistry**

please show me how to do it DrBob222

*December 8, 2011*

**chemistry**

I don't know what is it

*December 8, 2011*

**chemistry**

3. Compound A is provided as a 500mM solution. If 12.5 mL is taken and added to 12.5mL of water, how many moles (or millimoles / micromoles) are there per 0.1mL of the diluted solution?

*December 8, 2011*

**calculus**

An object moves in such a manner that its velocity at time t is given by v(t) = t3 - 4t2 + 3t At t = 0, it starts at position x = 0. During the interval [0, 4] what is the net distance moved?

*December 1, 2011*

**Social Studies**

What are the three countries that have influenced Canadian culture and history?

*November 29, 2011*

**algebra**

what is in the exact middle of $5.50 and $5.75?

*November 27, 2011*

**physics**

OMG !! i was suck on this question for like a billion years !! and i still havent gotten the answer!:(

*November 3, 2011*

**Psychology**

John Bowlby, a British psychoanalyst, drew attention to the importance of attachment

*October 25, 2011*

**Psychology**

This passage is mostly about

*October 25, 2011*

**Psychology**

In this passage, the word dire means

*October 25, 2011*

**Math**

Write a function rule for the area A(n) of a square when you know length n of a side?

*October 23, 2011*

**bio lit**

Concrete Poem on a cell

*October 17, 2011*

**Bio lit**

limerick on cell

*October 17, 2011*

**Bio Lit**

Haiku on a Cell

*October 17, 2011*

**american history**

who won the election of 1920 and what was his promise to the nation?

*October 17, 2011*

**Chemistry 12**

0.012

*October 17, 2011*

**physics**

a sprinter exerts 850N on the starting blocks at 25 degrees to the horizon at the beginning of a race. what is the vertical force exerted at the blocks?

*October 15, 2011*

**physics**

a sprinter exerts 850N on the starting blocks at 25 degrees to the horizon at the beginning of a race. what is the vertical force exerted at the blocks?

*October 15, 2011*

**managerial accounting**

. (TCO 4) Paschal’s Parasailing Enterprises has estimated that fixed costs per month are $115,600 and variable cost per dollar of sales is $0.38. This means that the contribution margin ratio is 62 percent. (a) What is the break-even point per month in sales dollars? (b) ...

*October 12, 2011*

**managerial accounting**

The building and equipment are estimated to cost $1,100,000 (ignore depreciation). The building and equipment have zero estimated residual value at the end of 10 years. Munster’s required rate of return for this project is 12 percent. Net Cash Flow related to each year of...

*October 12, 2011*

**Math**

Your bank account balance is -20.85. you deposit $15.50. What is your new balance?

*October 5, 2011*

**Stoichiometry**

Dr.Bob222 is right. Rodney, your answer is wrong. I just did this problem online and the correct answers were the one that Dr.Bob22 gave.

*October 4, 2011*

**Physics**

a) 0=45*(1.44+V)+160V V=-0.316m/s 1.44+V=1.44-0.316=1.124m/s

*October 4, 2011*

**physics**

Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.

*October 3, 2011*

**science**

Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.

*October 3, 2011*

**College Chemistry**

I am assuming its a liquid. My question is writing the chemical equation. What is the chemical equation? Is it C6H6 + O2 ---> CO2 + H2O? And if so how do I balance it?

*September 25, 2011*

**College Chemistry**

I am going to assume it is a liquid

*September 25, 2011*

**College Chemistry**

One liter of benzene (C6H6) is completely burned (oxidized) with air. Write a balanced chemical equation to represent this reaction.

*September 25, 2011*

**Math**

Can anyone answer: "R is the set with even natural numbers that are less than 2" in roster and set builder form

*September 25, 2011*

**Math**

Is 0 an even natural number?

*September 25, 2011*

**economics**

A profit-maximizing firm in a competitive market is currently producing 100 units of output. It has average revenue so $10, average total cost of $8 and fixed cost of $200. a. what is the profit? b. what is the marginal cost? c. what is its average variable cost? d. is the ...

*September 20, 2011*

**accounting**

6. Acme Manufacturing Company estimates factory overhead as a percentage of machine hours. On 1.1.11, Acme estimates total factory overhead of $400,000 for the year, and estimates 20,000 machine hours will be required during the year. During the year, 10,000 units of product ...

*September 20, 2011*

**accounting**

Bubba Production Company produces a homogenous product. All materials are added at the beginning of production and other product costs are added evenly over time until the product is complete. Conversion costs were 70% complete with respect to the 2,000 units in process July 1...

*September 20, 2011*

**Science**

Analyzing Ideas- Why would you weight less on a high mountain than you would at sea level?

*September 19, 2011*

**Math**

What percent of 1.5 is 3?

*September 14, 2011*

**Spanish**

Also, you would put ¨me gustan los deportes¨, for the same reason (I like sports, not). Te Gustan is ¨do you like sports¨

*September 8, 2011*

**Spanish**

¨Cómo te llamas¨ directly translates to ¨what do you call yourself?¨ Me llamo is correct because it means ¨I call (llamo) myself (me) Isabel¨. Te llamas Isabel is ¨you call yourself Isabel¨, while Me llamas Isabel means ¨you call me ...

*September 8, 2011*

**Subjects**

Will i get a lot of homework in middle skoo ????? here r my classes Math F.A.C.S. Art Sci English Content Support 7c Gym Social Studies also if i did what to do ???? need tips ???? plzzz answer

*September 5, 2011*

**Subjects**

What's Content Support 7c ???? it says it in my schedule i'm going into the 7th grade this week plzzz answer also wat do u do ????? plzz answer plzzz i kno it's a helping class but do you learn the same thing in ur regular class ????? plzzz answer

*September 5, 2011*

**math**

TRUE OR FALSE (x+y)+2=2+(x+y) is it associative property? (2*3)*5=(3*2)*5 is it commutative property? (X+3)4=4X+12 is an example of the distributive property of multiplication over addition (10+y)+z= 10 +(y+z) is this associative property?

*August 29, 2011*

**math**

-8/3*2=

*August 29, 2011*

**math**

Can anyone give me some pointers on how to plot the graph in excel please

*August 25, 2011*

**math**

Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of sin -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special tables sin pi/6 = cos pi/3 = 1/2 cos...

*August 25, 2011*

**math**

what symbols

*August 24, 2011*

**math**

Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of si -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special tables sin(ƒÎ/6) = cos(&#...

*August 24, 2011*

**math**

its okay I have it 1.596322539

*August 24, 2011*

**math**

4^(3-x)=7 showing all steps

*August 24, 2011*

**math**

use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and tan 4pi/3 = root 3. ...

*August 24, 2011*

**Matg**

Write 7hb as a phrase.

*August 24, 2011*

**Math**

Write a phrase for each expression 7hb

*August 23, 2011*

**math**

use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and tan 4pi/3 = root 3 but...

*August 23, 2011*

**math**

solve 4^(3-x)=7 to 3 s.f. showing all workings. I have got as far as -x =log(7)-3log4/log(4)

*August 23, 2011*