Tuesday

August 30, 2016
Total # Posts: 936

**Chemistry**

-q = dH ( dH = change in enthalpy Kj/mol) Use q=mc(Tf-Ti) and then convert to deltaH q=mc(Tf-Ti) q =? c= 4.814 J/g*C use specific heat of water since its in aqueous sol and we are not told differently m= total mass= mass KBr + mass water mass KBr= 5.0 g *mass of water from ...
*December 2, 2010*

**math**

Hmm 12 is already an even number! Hence you should not count 12 twice, therefore answer should be 7/15. :)
*November 27, 2010*

**social studies**

Hi majenta, In my view a thesis statement is only good if it is properly justified. In this case, you have to clarify what you mean by "important" - which may be subjective (different people may interpret it differently) as well as rather broad. So like what I think ...
*November 27, 2010*

**holy name university**

Hi january, Dalton's Law of partial pressures states that P(total) = P(1) + P(2) + P(3) +....+ P(n) where 1, 2 and 3 are gases in the mixture. So applying the law 150kPa = 100kPa + 24kPa + P(oxygen) Hope I helped! (: -J
*November 27, 2010*

**chemistry**

Oops, sorry, my apologies for typing in caps. Was just trying to point that out. :)
*November 26, 2010*

**chemistry**

Hi faye, Alright so we want to prepare a 800ml solution of 0.15M concentration. So first we calculate the amount of Ca(OH)2 **NOTE: SHOULD NOT BE CA(OH) COS +2 CHARGE OF CA2+ IS NOT BALANCED! CA(OH)2 IS A SOLID AND NOT AN ION, HENCE THE COMPOUND CANNOT HAVE AN OVERALL CHARGE...
*November 26, 2010*

**Chemistry**

Hi Lindsay, Alright, to begin with, since this is an organic compound, we identify the functional group. [-C(=O)-NH- means its an amide] So when you hydrolyse an amide, you are breaking the (amide) bond between C=O and N-H, and you add water because its a hydrolysis (OH- goes ...
*November 24, 2010*

**chem class**

Hi laney, For this question, it would be appropriate for you to ask yourself.. what is present in the solution after mixing? KOH is a strong basic salt while HCL is a strong acidic salt. KOH + HCL --> KCL + H2O Note that amount of KOH = HCL = 0.125 X (50/1000), so there is ...
*November 24, 2010*

**chemistry**

Hi roseanne, First, we write out the equation when MX2 dissolves in water (or a suitable solvent): MX2 --> (reversible arrow) M2+ + 2X- So Ksp = [M2+][X-]^2 Solubility would refer to the concentration of an ion produced in 1:1 ratio with the original solid. In this case, we...
*November 24, 2010*

**Chem, LAST ONE PLEASE HELP!**

Hey Tara, Hmm, I'm not too sure about this question, but I'd guess it has something to do with the following formula: G = G(not)+ RTlnQ So basically G(not) = -67.4 kJ R= 0.008314 kJ mol^-1 K^-1.(molar gas constant)(Note that units must be kJ to match up with the G(not...
*November 24, 2010*

**physics**

Hi sweetie, As a coconut is falling down, the only force acting on it is the gravitational force (its weight) if you neglect air resistance. So as it is accelerating as it falls, velocity ______. P.E. of coconut = mgh, where m = mass of coconut, and h = height of coconut above...
*November 24, 2010*

**physics**

Hi sweetie, momentum = mass (kg) X velocity (m/sec). So for 1) At rest, velocity = 0m/sec. So momentum should be.... (Apply formula above) [Ans:0 kgm/sec] for 2) At that final state, velocity = 30m/sec. So momentum should be.... (Apply formula above) [Ans: 90,000kgm/sec] for 3...
*November 24, 2010*

**chemistry**

Hi Tara, To find out if a reaction is spontaneous, we calculate E(cell). If E(cell)>0, reaction is spontaneous. If E(cell)<0, reaction is not spontaneous. If E(cell)=0, reaction will proceed until equilibrium is established. So in this case, E(cell) = E(reduction)-E(...
*November 24, 2010*

**maths**

Oops sorry! I realised that I also made a mistake near the end. When I said "...Therefore, 24x=98cm.." I meant 14x (Not 24!) = 98cm. =)
*November 24, 2010*

**maths**

Hi aisha, Let's start with formulating an algebriac expression for the perimeter. We know that perimeter of rectangle = 2(length) + 2(width). Since we don't know length or width, we let x be the width of the rectangle. Hence length = 5x-3 [because length = (5 X width...
*November 24, 2010*

**chemistry**

Hi Tara, Alright, by convention, we usually write [Oxidation]/[Reduction]in notation. Hence, the oxidation half-cell is the Cr/Cr3+ half-cell while the reduction half-cell is the Ni2+/Ni half-cell. [Alternatively, you can compare E(not) values such that the half-cell with the ...
*November 24, 2010*

**chemistry**

That comes from multiplying 3X10^-8 and 0.0385 when we expand 3X10^-8(0.0385-x).
*November 23, 2010*

**chemistry**

Hiya, From what you said it seems that you understand everything up till "x = [H+]= 3.4 x 10^-5 M" So we know that 3X10^-8 = x^2/(0.0385-x) Bring (0.0385-x) over to the left hand side, Hence 3X10^-8(0.0385-x) = x^2 Then we expand the left hand side, 1.155X10^-9 - ...
*November 23, 2010*

**HUM176**

Newspapers, once available only in print, have evolved into 24-hour multimedia operations. In addition to newspapers, briefly describe the evolution of movies, television, Internet, books and magazines, and media companies throughout the last century.
*November 21, 2010*

**algebra**

(6*5)/3 is this a true sentence
*November 21, 2010*

**Probabilities**

1.) two marbles are drawn without replacement from a bowl containing seven red, four blue, and nine yellow marbles. what is the probability that at least one is red? 2.)a card is drawn from a standard deck of 52 cards. what is the probability that the card is neither a four or...
*November 9, 2010*

**Probabilities**

1.) two marbles are drawn without replacement from a bowl containing seven red, four blue, and nine yellow marbles. what is the probability that at least one is red? 2.)a card is drawn from a standard deck of 52 cards. what is the probability that the card is neither a four or...
*November 9, 2010*

**AP Chem**

66 kJ/mol
*November 7, 2010*

**chemistry**

could someone please still explain? and explain how the 4.74 pH was found? thanks
*November 7, 2010*

**chemistry**

couple someone please still explain? and explain how the 4.74 pH was found? thanks
*November 7, 2010*

**Social Studies**

name if the following involve, seperation in powers, checks and balances, judicial review, federalism, or some combination of these principles, and say why A) the state law requires that a prayer be said each day in public schools. The courts rule that law wiolates a first ...
*October 31, 2010*

**Calculus 2**

I am having so many problems with these volume problems, 1. Find the volume of a the solid obtained by rotating the region enclosed by: x = 2y and y^3 = x with y>0 about the x axis 2.Find the volume of cone of height h = 250 and a circular base with radius r = 150 First ...
*October 23, 2010*

**physics**

A horizontal spring, resting on a frictionless tabletop, is stretched 14 from its unstretched configuration and a 1.00- mass is attached to it. The system is released from rest. A fraction of a second later, the spring finds itself compressed 3.6 from its unstretched ...
*October 15, 2010*

**Social Studies**

I need help making an MLA works cited. i have 3 sources... they are all newspaper articles that i found online. someone please help me
*October 13, 2010*

**tangential speed and accelerations**

A helicoptor bladehas an angular speed of 6.50 rev/s and has an angular acceleration of 1.30 rev/s. point 1 on the blade is 3.00m and point 2 is 6.7m. Can you find the speeds of A) the tangential speeds and B) the tangential accelerations?
*October 12, 2010*

**physics**

a truck is traveling to the right and slowing down. If we define a positive displacement to be motion to the right, the truck has...What Velocity and acceleration?
*October 12, 2010*

**physics**

What average power is required for a runner with a mass of 80 kg to reach a speed of 8.2 m/s during a time of 1.8 s?
*October 10, 2010*

**chemistry**

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?
*October 4, 2010*

**chemistry**

You need to prepare 500.00 mL of a 0.25 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.25 M solution?
*October 4, 2010*

**english**

Is this a better present tense sentence? I think education is a very important role in successful financial planning. And is THINK the verb?
*September 29, 2010*

**english**

Is this past perfect I had never studied financing until I signed up for college.
*September 29, 2010*

**english**

Would this sentence be past simple tense or past perfect tense? I learned how to create a financial plan and to budget money in my class.
*September 29, 2010*

**english**

What verb tense would this sentence be? I am learning so much about financial planning in my personal finance class.
*September 29, 2010*

**English**

Is this a present tense verb sentence? I believe education is a very important role in successful financial planning
*September 29, 2010*

**English**

what is the proper verb tense? With an education i will be able to find a better job?
*September 29, 2010*

**college**

what is the proper verb tense in the sentence below? With an education i will be able to find a better job?
*September 29, 2010*

**college**

I need to write 5 sentences showing the verb and its tense. The sentences need to be about the role of education in sucessful financial planning. I am so confused
*September 29, 2010*

**College Physics**

a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
*September 26, 2010*

**algebra**

solve for v: p = mv explain how to get the answer and what the answer is please
*September 25, 2010*

**algebra**

solve for d: s= d/t HELP EXPLAIN HOW TO DO THIS PLEASE
*September 25, 2010*

**algebra**

solve for m: F = ma someone tell me how to do this please!!!!!
*September 25, 2010*

**algebra**

will someone tell me what the answer is to this problem? and how they got the answer? SO CONFUSED solve for x: y = mx + b
*September 25, 2010*

**icp**

Charge q is 1 unit of distance away from the source charge S. Charge p is six times further away. The force exerted between S and q is _____ the force exerted between S and p.
*September 20, 2010*

**physics**

Thanks guys!
*September 19, 2010*

**physics**

A 4kg object is subjected to two forces, F1=2Ni-3Nj, and F2=4Ni-11Nj. The object is at rest at the origin at t=0. What is the objects acceleration? I know you use F=m*a Do you add the two F vectors together & take the square root to find the sum of F? ex: Fnet=6Ni-14Nj & then ...
*September 19, 2010*

**Physics **

A wooden boxcar is moving along a straight railroad track at speed v1. A sniper fires a bullet (initial speed v2) at it from a high-powered rifle. The bullet passes though both lengthwise walls of the car, its entrance and exit holes being exactly opposite each as viewed from...
*September 18, 2010*

**math**

The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 2.5 to 8.5 millimeters. What is the probability that a randomly selected ball bearing has a diameter less than 4.5 millimeters? a.0.38, b.0.28, c....
*September 18, 2010*

**math**

Write and solve an equation to model the situation: two friends are renting an apartment. they pay the landlord the first months rent. the landlord also requires them to pay an additional half of a month's rent for a security deposit. the total amount they pay the landlord...
*September 16, 2010*

**math**

5-x-x=-1 will someone please tell me how do do this problem?
*September 16, 2010*

**physics**

A steam catapult launches a jet aircraft (from rest) from the aircraft carrier John C. Stennis, giving it a speed of 160 mi/h in 2.40 s. Find the average acceleration of the plane. Assuming that the acceleration is constant, find the distance the plane moves.
*September 16, 2010*

**physics**

A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s. Find the truck's original speed. Find its acceleration.
*September 16, 2010*

**physics**

original speed and acceleration
*September 16, 2010*

**physics**

A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s.
*September 16, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 35 mi/h to a speed of 70 mi/h?
*September 15, 2010*

**spanish**

Que te gusta hacer? Will someone give me some possible answers for this question?
*September 15, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.50 m/s2. How long does it take for this car to go from a speed of 45 mi/h to a speed of 85 mi/h?
*September 14, 2010*

**spanish**

what does "contesta estas preguntas sobre ti, tu familia, y tus amigos" mean. does it mean answer the questions about yourself, your family, and your friends? does that mean i have to have 3 sentances for each question.
*September 14, 2010*

**chemistry**

Describe how to prepare 1 liter of 0.5N solution of HCl from concentrated HCl. H=1, Cl=35.5, spgr=1.19, 37.2%
*September 7, 2010*

**science**

How many ml of concetrated HCl are required to make 2 liters of 3N HCl from concentrated HCl that is 37% w/v and has a specific gravity of 1.2. H=1 Cl=35.5
*September 7, 2010*

**chemistry**

How do I convert 10 g CaCl2 to CaCl2.10H2O?
*September 5, 2010*

**chemistry**

You wish to prepare a 10% CaCl2 solution. Only CaCl2 * 10H2O is availalbe. How many grams of the hydrated compound are required for 250ml of the reagent? Ca=40 Cl=35.5
*September 5, 2010*

**chemistry**

How do i convert g CaCl2 to g CaCl2*H2O?
*September 5, 2010*

**chemistry**

500ml of 0.1M CaCl2 is required for protimes. How many grams of CaCl2 * H2O should you weight out?
*September 5, 2010*

**math**

Still confused. How do you write out the linear range of a set of data points. R=???
*September 3, 2010*

**math**

I have a graph plotted which makes a straight line (linear graph) The points are as follows X , Y (.25, 0.593) (.50, 1.161) (.75, 1.762) (1.0, 2.348) I need to determine the linear range. Also, can Beer's Law be applied?
*September 3, 2010*

**College Math**

farmer wishes to fence a rectangular area along the river bank. No fence is required on the side adjacent to the river. The material for the fence costs P16.00 per meter for the side parallel to the river, P12.00 per meter for the side perpendicular to the river. The farmer ...
*August 25, 2010*

**Math**

You need to replace the molding around a floor that is 15 ft. long & 23 ft. 6 in. wide. The molding sells for $0.50 per ft.. How much will the molding cost?
*August 18, 2010*

**math problem**

(-1)(.999)+(99)(.001)+(49)(1/999)+(49)(1/998)+(49)(1/997)=-.75
*July 27, 2010*

**chemistry**

A solution is made by mixing 35.0 mL of toluene C6H5CH3d=0867gmL with 125.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are so the L of solution is...? 35ml + 125ml and then converting to L??
*June 24, 2010*

**chemistry**

The solubility of borax is directly proportional to temperature. Therefore, the sign of H is A. negative B. positive C. unknown with the given information is the answer b?
*June 24, 2010*

**chemistry**

A solution is made by mixing 35.0 mL of toluene C6H5CH3d=0867gmL with 125.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are how do you find the L of SOLUTION
*June 24, 2010*

**matth**

a tourist in framce wasnts to visit 5 different cities. if the route is ransomly selested what is the probability that she will visit ciites in alphabetical order
*June 21, 2010*

**biology**

I'm not really sure but I think its a. Because transcription, which is the synthesis of the mRNA, occurs earlier than the other options, not producing mRNA would prevent other steps to happen. Each step causes energy and transcription regulation saves the most.
*June 20, 2010*

**math**

Justin had 44 dollars before spending n dollars on jeans. How much money remains?
*June 18, 2010*

**chemistry**

242.80 mL
*June 18, 2010*

**COM 220**

I was looking for help with my research paper on Global warming
*June 18, 2010*

**BIOLOGY**

They are seedless because the seeds were "aborted" when still small (check the wikipedia site Parthenocarpy.) Parthenocarpic plants can no longer reproduce
*June 16, 2010*

**CHM 152**

A solution is prepared by dissolving 23.7 g of Ca in 375 g of water. The density of the resulting solution is density of 1.05 g/ml
*June 10, 2010*

**physics**

A plane flies at 1.25 times the speed. It's sonic boom reaches aman on the ground 1.00 min after the plan passes directly overhead.What is the altitude of the plane? Assume the speed of sound to be 330m/s.
*June 10, 2010*

**consumer math**

2,900
*May 24, 2010*

**Algebra 2: Probability and Stats**

16%
*May 24, 2010*

**Math/Albebra**

x^2+y^2=25
*May 16, 2010*

**Y**

what is an arrangement of quantities whose positions are based upon the natural numbers
*May 13, 2010*

**Unit Cells**

what does the pi stand for?
*May 9, 2010*

**math**

2x/5-x/3=3 2x[3]-5[x]=3 6x-5x=3 x=3
*May 5, 2010*

**Math**

6.30* 8.5/100 = 0.54 I THINK SO THATS THE BEST I CAN DO. U ARE PROBABLY SAYING U CAN DO THIS FOR URSELF BUT I DONOT KNOW ANY OTHER WAY.
*May 4, 2010*

**P.O.B**

NAME FOUR DEPARTMENTS OF A TYPICAL BUSINESS AND ONE FUNCTION OF EACH
*May 4, 2010*

**Chemistry**

I THINK SO. BECAUSE IN THIS CASE U WILL KNOW WHICH ONE IS STRONG OR WEAK
*May 4, 2010*

**Language arts**

the verb is plans as sara said and also to visit(the verb to be)
*May 4, 2010*

**general**

11.30% is correct
*May 4, 2010*

**english**

thank u sra. MAY GOD Bless
*May 3, 2010*

**Math Check**

3/x+ 2/x-4 = 3(x-4)+ 2(x)=0 3x-12+2x=0 3x+2x=12 5x=12 x=12-5 x=7 or only if you cross multiply the 3*x-4 which is 3x-12 and put it equal to 2*x which is 2x that could work.
*May 1, 2010*

**Math**

2(7)-3(-3)-4(-1) 14+9+4= 27
*April 30, 2010*

**Math**

815*20/10 =1630
*April 16, 2010*

**Math**

A car travels 815 km in 10 days. at this rate, how far would it travel in 20 days?
*April 16, 2010*