Thursday

May 26, 2016
Total # Posts: 1,565

**Chemistry**

Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure benzene freezes at 5....
*January 21, 2013*

**Math**

A large factory knows that if it sells it's new gadgets for $10 each, it can sell 350 per month and if it sells the same gadgets for $8 it will sell 500 per month assuming the relationship between price and sales is linear predict the monthly sales of gadgets to the ...
*January 17, 2013*

**Math**

Use a calculator to simplify the expression. 8/2^3-2+4.1*2 When I used the calculator, I got 22.2 So then I used "PEMDAS" but got 7.53333... But the answer is 7.2 can someone help please?
*January 17, 2013*

**Earth Science**

1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology always benefit society?
*January 13, 2013*

**MATH!!!**

Fist you use the distributive property method. 3(d+12)=8-4d 3d+36=8-4d Subtract 8 from each side 3d+28=-4d Subtract 3d from both sides 28=-7d divide by -7 from each side ?= d
*January 13, 2013*

**math**

how much money do i have left from 36p if i spend 1/4 of it
*January 13, 2013*

**English**

This sentence has an error but I'm not sure if this is correct. His father and uncle were theirselves great travelers. Is it suppose to be: His father and uncle were themselves great travelers.
*January 12, 2013*

**Earth Science**

A. Water
*January 12, 2013*

**Earth science**

B. Pressure
*January 12, 2013*

**Math**

i don't under stand the word math problem
*January 12, 2013*

**Earth science**

Plate tectonics
*January 12, 2013*

**MATH**

First, you combine like-terms. 11w-9-7w=15 11w minus 7w is 4w 4w-9=15 add 9 to each side 4w=24 divide each side by 4 w= ?
*January 12, 2013*

**Earth Science**

1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology always benefit society?
*January 12, 2013*

**MATH HELP!!!!!!**

First, you subtract 4 from both sides, then times 7/2 on each side: 10 = 2/7n+4 14= 2/7n 49=n
*January 12, 2013*

**English**

Choose the pronoun that correctly completes each sentence. 1. (who, whom) will the choir director choose? Is it whom?
*January 10, 2013*

**Algebra**

A store is selling compact discs for $10.50 and $8.50. You buy 10 discs and spend a total of $93. How many compact discs did you buy for $10.50? $8.50?
*January 9, 2013*

**Algebra**

The girl's basketball team scored 57 points and made 25 shots. Each shot was worth 2 or 3 points each. Write a linear system.
*January 9, 2013*

**Algebra- Check Please**

A farmer is tracking two wild honey bees in his field. He maps the first bee's path back to the hive on the line y=9/7x. the second bee's bee path follows the line y=-3x+12. Their paths cross at the hive. At what coordinate will the farmer find the hive? I got (-6/7, 6)
*January 7, 2013*

**Trigonometry**

Yes I had a typo. Thank you!! (I don't know how to respond to answers besides this....)
*January 7, 2013*

**Trigonometry**

Prove that tanx+cotx=2sec(2x) Thank you! :)
*January 7, 2013*

**Algebra**

Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/2p-q=4 Thanks.
*January 6, 2013*

**Algebra**

Use substitution method to solve the linear system. Can someone please check if I did this problem right? Thanks X+y=12 X+3/2y=3/2 Y=21 x=-9
*January 6, 2013*

**algebra**

I have another question. So I solved the problem but then I have to put it in an ordered pair form. If I was using the variables "x and y," then it would be (x,y) but what if I were using different variables, in this case s and t, how do I know which one is the x and...
*January 6, 2013*

**algebra**

Use the substitution method to solve the linear system. Thanks! s= t+4 2t+s=19
*January 6, 2013*

**trig**

2sinxcosx+4sin^2xcos^2x=0 solve for x in radians between [0,2pi) (I mean that it is sine squared x and cosine squared x not sine to the power of 2x or cosine to the power of 2x)
*December 19, 2012*

**Math**

When the mean is greater than the median, what does it suggests about the data set?
*December 17, 2012*

**English**

Find the plural that has been formed incorrectly. Then write it in its correct plural form. Dad was hoping to catch several bass and trouts for our suppers. I'm not sure if it's "trouts" or "suppers".
*December 13, 2012*

**math**

andrea cuts 62 1/2 inches of ribbon into 4 equal hair ribbons. How long was each hair ribbon?
*December 12, 2012*

**Algebra **

I don't get how you would know which way to shade the inequality when it's true or false. For example the inequality 2x+3y> 12 When I solve it it's y>-2/3x+4 But when I graph the line how would I know which side to shade?
*December 12, 2012*

**Language**

Hi! So I am having a hard time in Chinese class. Paying Attention that is. My teacher lets all the students goof off, and it's hard to pay attention. She doesn't care if we are on our phones, so it's a BIG temptation. I know that if I payed attention in class more...
*December 11, 2012*

**Algebra**

I solved the inequality and now I have to graph and shade it in. Y<-5x-6 0<-5x-6 I used the test point 0,0 and substituted in y but how do I know if it's true or false?
*December 11, 2012*

**Algebra **

Solve the inequality and graph. 7<1-x<13 I got -6 >x >-12 Is that correct?
*December 9, 2012*

**English**

Identify the nouns and verb/verb phrases in the sentence. Employers value honesty and hard work. Nouns: Employers, honesty, and work Verb: Value
*December 9, 2012*

**Chemistry**

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)?
*December 6, 2012*

**Chemistry**

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C . The ...
*December 6, 2012*

**Chemistry**

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.
*December 6, 2012*

**chemistry**

Choose the bidentate ligand from the substances below. A) cyanide ion B) ammonia C) EDTA D) carbon monoxide E) ethylenediamine
*December 6, 2012*

**Chemistry**

The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.
*December 6, 2012*

**Chemistry**

Which of the following compounds can exhibit cis-trans isomerism? A) [Fe(CO)5ONO]2+ B) [Fe(CO)3(NH3)3]3+ C) [Cu(CO)5Br]+ D) [Cr(H2O)4Br2]+ E) [Fe(NH3)6]2+
*December 6, 2012*

**Chemistry**

Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) ¨ 3 S(s) + 2 H2O(g)
*December 6, 2012*

**Chemistry**

What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)
*December 6, 2012*

**Chemistry**

combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?
*December 6, 2012*

**RE:ENGLISH QUOTE**

Is there a different way to explain the meaning of the quote?
*December 2, 2012*

**RE:ENGLISH QUOTE**

Here is my meaning of Hellen Keller's quote: It means that by using my voice I can do something. I may not be THE one but AT LEAST I AM one. I know that I can't do everything but the thing is, I CAN do SOMETHING. I will do what I can do to make a difference. I don'...
*December 2, 2012*

**English **

“I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do.” Please explain what this quote means, thanks!
*December 2, 2012*

**English**

"It is better to lead from behind and to put others in front, especially when you celebrate victory when nice things occur. You take the front line when there is danger. Then people will appreciate your leadership." What does this quote mean?
*December 2, 2012*

**English-Speech**

I am workng on my introduction part of my speech and here is my transition sentence: With my voice, I can make a difference in 5 different ways. Would these be like the examples of the "5 different ways" ? preventing people from doing a bad action, helping a friend ...
*December 1, 2012*

**English**

What does the quote, ""The world is not interested in what we do for a living. What they are interested in is what we have to offer freely - hope, strength, love and the power to make a difference!" mean?
*November 30, 2012*

**math**

You need 1/2 cup of sugar to make a three layer cake. How much sugar would you need for one-layer cake?
*November 29, 2012*

**math**

2/10 , 3/15 , 4/20, 5/25 Those are some examples.
*November 27, 2012*

**English**

I want to put these words in a sentence that makes sense. Many will think that my voice doesn't matter for people my age. It doesn't sound right to me.
*November 27, 2012*

**Physics**

three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; its hub has ...
*November 27, 2012*

**English**

What would be a good quote to describe me encouraging someone to become a better singer? How about giving advice and preventing something?
*November 25, 2012*

**math**

You are correct.
*November 25, 2012*

**math**

4x if x=0.016 You just substitute in 0.016 for x 4 * 0.016 = ?
*November 25, 2012*

**English Speech**

That does not make any sense to me...
*November 25, 2012*

**English Speech**

This year, all the students in the same grade has to give a speech and the topic is "My voice is important because..." instead of repeating in every new story, "my voice is important because.." what is another way to state it?
*November 25, 2012*

**physics**

The small mass m sliding without friction along a looped track is to remain on the track at all times, even at the very top of the loop of radius r. a) In terms of the given quantities, determine the minimum release height h b) If the actual release height is 5h, calculate the...
*November 24, 2012*

**chemistry**

Aspirin tablet, mass of tablet= 0.4149 g concentration of iron III salicylate complex = 3.997E-4, What is the concentration of ASA in the original solution? What is the mass of ASA in the original solution? The procedure was as follows: accurately weigh by difference a tablet ...
*November 20, 2012*

**chemistry**

Aspirin tablet, mass of tablet= 0.4149 g concentration of iron III salicylate complex = 3.997E-4, What is the concentration of ASA in the original solution? What is the mass of ASA in the original solution? The procedure was as follows: accurately weigh by difference a tablet ...
*November 20, 2012*

**Chemistry**

Aspirin tablet, mass of tablet= 0.4149 g concentration of iron III salicylate complex = 3.997E-4, What is the concentration of ASA in the original solution? What is the mass of ASA in the original solution? The procedure was as follows: accurately weigh by difference a tablet ...
*November 20, 2012*

**Chemistry**

So does that mean that the salicylate and the iron 3 complex will have an equal amount of mol since they are reacting in a 1:1 mol ratio. If this is true than how will i calculate the concentration of the iron 3 salicylate complex?
*November 19, 2012*

**Chemistry **

1 ml of 8.675x10^-3 M sodium salicylate was dispensed in a 100 ml volumetric flask, It was diluted to 100ml mark with acidified 0.02 M Iron (III) Chloride solution. What is the number of moles of Iron (III) Salicylate complex?
*November 19, 2012*

**History**

What are five kinds of cases heard by the Federal Courts?
*November 19, 2012*

**History**

Thanks! It really helped a lot. I don't think I need help on the question that I posted anymore.
*November 19, 2012*

**History **

What are the four powers denied to congress?
*November 19, 2012*

**chemistry**

Spectrophotometric analysis of commercial aspririn. If the number of moles of sodium salicylate are 8.675x10^-6 what would be the number of moles of Iron (III) Salicylate complex and what would be its concentration. The volume of sodium salicylate used is 1 ml and its ...
*November 19, 2012*

**physics, university**

A 50.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11 x 10-8 ohms/m and the density is 7.86 g/cm3. The material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 ohms. a) What ...
*November 19, 2012*

**Math **

14.8cos(27.8)(29cos(x))+14.8sin(27.8)(29sin(x))=22 How do you solve for x?
*November 17, 2012*

**Physics **

Vectors A and B are in the xy plane and their scalar product is 20.6 units.? If A makes a 27.8 angle with the x axis and has magnitude A= 14.8 units, and B has magnitude B= 29.0 units, what can you say about the direction of B?
*November 17, 2012*

**Math-Correct Please**

Did I do this problem right? Rewrite the equation in slope-intercept form. y+4=5(x+2) y=5x+6
*November 15, 2012*

**physics**

The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? *I think I keep doing a step wrong in here so step by step instruction would be so...
*November 15, 2012*

**PHYSICS**

15.0 moles of an ideal gas, at an initial pressure of 3.50 x105 N/m2 and an initial volume of 1.200 m3, undergo a small isothermal expansion to a volume of 1.220 m3. Find the work done by the gas.
*November 14, 2012*

**English**

Are there any words that end with "ale" or "ail" that is a place?
*November 14, 2012*

**Chemistry**

Thankyou Dr. Bob also on my other question I am not sure how to get the heat capacity of NH4Cl to calculate molar enthalpy and I also don't know how to determine the concentration of NH4Cl inside the calorimeter. Please help me on that question as well and thankyou soo much.
*November 13, 2012*

**Chemistry**

A 5ml, 10ml, 15 ml, and 20ml Aliquot of 0.010 M sodium salicylate solution was diluted to 100 ml in four different 100ml volumetric flasks with the iron (III)Chloride solution. What are their concentrations.
*November 13, 2012*

**Chemistry**

Thankyou Dr. Bob and can you please help me on one more question if this reaction goes to completion what would the final concentration of NH4Cl in the calorimeter. I know how to figure it out if its not in the calorimeter but I am wondering if the calculations are different ...
*November 12, 2012*

**Chemistry**

I don't know the heat capacity of NH4Cl or the density of it, can you please help me figure those out.
*November 12, 2012*

**Chemistry**

Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.
*November 12, 2012*

**Math**

Please help me understand this question, thanks! 10. Write the slope-intercept form of an equation of the line perpendicular to the line in Exercise 7 with a y-intercept of -3. 7. (4, -9), (-3, 2)
*November 12, 2012*

**Physics**

Three uniform thin rods, each of length L = 16 cm, form an inverted U. The vertical rods each have mass of 14 g; the horizontal rod has mass of 50 g. Where is the center of mass of the assembly (x, y)?
*November 12, 2012*

**Physics Q**

If a water heater has a capacity of 54.4 gallons and a 4910 W heating element, how much time is required to raise the temperature of the water from 19.8oC to 60.0oC? Assume that the heater is well insulated and no water is withdrawn from the tank during this time.
*November 10, 2012*

**Physics Help!**

An air bubble has a volume of 1.51 cm3 when it is released by a submarine 102 m below the surface of a lake. What is the volume of the bubble when it reaches the surface? Assume that the temperature of the air in the bubble remains constant during ascent.
*November 10, 2012*

**PHYSICS!**

0.115 kg of water at 81.0o C is poured into an insulated cup containing 0.220 kg of ice initally at 0o. Calculate the mass of liquid when the system reaches thermal equilibrium.
*November 10, 2012*

**S.S. Check answers**

you got them all right :) i got a 100%
*November 9, 2012*

**Physics**

If a sonar echo takes 2.20 seconds to return from a whale, how faw away is the whale?
*November 6, 2012*

**Math**

Actually it's 12 because you have to divde 24 by 2 and it leaves you with 12.
*November 4, 2012*

**Math**

8 / 10 = x / 15 times 15 on each side =24
*November 4, 2012*

**Literature**

Please help me understand this, thanks. The way a topic is handled is called its treatment. Review the chart you completed as you read the speech. Then describe Obama's treatment of his family in the speech. By speech, it's referring to Out of Many, One.
*November 4, 2012*

**Math Vocab**

I am doing vocabulary for math and one of the words are negative correction. I search all over the place and didn't find a definition for that word. Help please.
*November 4, 2012*

**Algebra**

Oh ok I get it. Is there any work to show to get this answer?
*November 1, 2012*

**Algebra**

May you please help me understand how to do this? Thanks Give the slope of a line perpendicular to the given line. 1. y=3x+5
*November 1, 2012*

**Thermal Physics, Kinetic Theory of Gases**

Your velocity is incorrect, it is too slow
*November 1, 2012*

**Language arts**

Check my answer please Which of the following would not be considered an asset? A) credit card debt B) a good credit rating C) an education Answer: A
*October 29, 2012*

**calculus**

lim x^(3)+x x->2 Suppose x^(2)+1 is greater than equal to f(x) is greater than equal to 4x-3 for all x. Compute lim f(x) x->2
*October 27, 2012*

**math**

(-x-3)+(4x-7) =3x -10
*October 25, 2012*

**Math**

To rewrte it in y=mx+b form, you do this : 3y=6x+3 divide both sides by 3 so it would be y= 2x+1
*October 25, 2012*

**math**

(14x-5)+(6x-4) = 14x-5+6x-4 Combine all like-terms =20x-9 Thus, 20x-9 is your final answer. Hope I helped!
*October 25, 2012*

**English**

Oh okay, thanks I get it now.
*October 25, 2012*

**English**

The full verb is "was propelled" Why wouldn't it be passive?
*October 25, 2012*