Wednesday

February 10, 2016
Total # Posts: 1,865

**Chemistry**

4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A + B --> 3C I 2.8x10-5 M 2.5x10-4 0 C -2x -x +3x E 2.8x10-5-2x 2.5x10-4-x 3x10-5 B = 2.5x10-4-x = 2.4x10-4 x = 1x10-5 A = 2.8x10-5-2(1x10-5) = 8x10-6 C = ...
*May 17, 2012*

**Chemistry**

3x = 0.006, x = 0.002 A = 0.004 B = 0.006 A2B3 = 0.01-0.002 = 0.008 (0.004)2(0.006)3/(0.008) = 4.32x10-10
*May 17, 2012*

**Chemistry**

A2B3 --> 2A + 3B I 0.001 0 0 C –x 2x 3x E 0.001-x 2x 3x 3x = 0.006, x = 0.002 A = 0.004 B = 0.006 A2B3 = 0.001-0.002 = (0.004)2(0.006)3/ Am I close?
*May 17, 2012*

**Chemistry**

oh shoot, sorry.. 4. 2A + B --> 3C 3. A2B3 --> 2A + 3B
*May 17, 2012*

**Chemistry**

PLEASE fully explain these...I've already tried to figure them out and failed terribly... thanks so much 4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: At equilibrium, there is 4.8 x 10-5 mol of B. ...
*May 17, 2012*

**chem**

At what temperature will a 1.0 g sample of neon gas exert a pressure of 500 torr in a 5.0 L container ? or At what temperature will a 0.0470 mol of a gas fill a balloon to 1.20 L under 0.988 atm pressure ?
*May 14, 2012*

**social studeis**

why do people celebrate when its kosovo's independence day?
*May 13, 2012*

**Chemistry**

25 mL of NaOH 0.16 M is added to 50 mL of 0.1 M HCl. What is the concentration of hydroxide ions in the solution?
*May 11, 2012*

**Chemistry**

Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M.
*May 11, 2012*

**Chemistry**

Calculate the [H+] of a solution obtained by mixing 1 L of hydrochloric acid 1.0 M with 1 litre of sodium hydroxide 0.990 M.
*May 11, 2012*

**Chemistry**

What mass of NaOH(s) must be added to 300 mL of HCl 0.25 M in order to completely neutralize this acid?
*May 11, 2012*

**Chemistry**

The Kc for the following reaction at 940oC is 1.38. Given the concentrations [CO2] = 0.500 M, [H2] = 0.425 M, [CO] = 0.610 M and [H2O] = 0.695 M, one can conclude that: H2(g) + CO2(g) ↔ CO(g) + H2O(g) Question 8 options: A) the system is not at equilibrium and the ...
*May 10, 2012*

**Chemistry**

Which of the following pairs of compounds will give a precipitate in a diluted solution? Question 4 options: A) Cu(NO3)2 and Na2CO3 B) KNO3 and NaCl C) MgCl2 and Ba(NO3)2 D) NH4Cl and Al2(SO4)3
*May 10, 2012*

**Chemistry**

A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be?
*May 10, 2012*

**Chemistry**

Is it 3.9 x 10^-7 M?
*May 10, 2012*

**Chemistry**

What is the maximum concentration of Ca2+ ions in a solution containing 0.010 M of F- ions?
*May 10, 2012*

**Chemistry**

A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be? Question 2 options: A) MgPb B) Pb(NO3)2 C) PbCrO4 D) MgCO3
*May 10, 2012*

**chemistry**

You work with the following system: 2X(g) <--> Y(g) At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.
*May 10, 2012*

**Trig**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.
*May 7, 2012*

**Probability**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.
*May 7, 2012*

**OSU**

For the equation f(9.5)=P(2.5)^9.5 solve for P.
*May 6, 2012*

**Calc 2**

Find the area of the region inside r=19sin(theta) but outside r=3
*May 6, 2012*

**algebra**

Mrs Acres will draw a circle on the playground for a game in gym class.The circle will havw a diameter of 16 feet.What is the circumference of the circle that Mrs Acres will paint?
*April 24, 2012*

**physics**

A 2.8 kg rectangular air mattress is 2 meters long,.5 meters wide, and .1 meter thick what mass can't support 50% submerged.
*April 23, 2012*

**physics**

The driver of a 1,450kg car, whose iron brake calipers mass is 3kg endures a brain malfuction at the top of a 20 degree parking ramp 20 meters long. It approaches the ramp going 20m/s and the driver recovers just as the car reaches the bottom. If the driver captures all the ...
*April 23, 2012*

**physics**

Fruity Florida farmers fecklessly fling flying fountains of water on the fruit during cold snaps. Explain why they do this
*April 23, 2012*

**Physics**

Suppose an electron was bound to a proton as in the hydrogen atom, but by the gravitational force rather than by the electric force. What would be the radius and energy of the first Bohr orbit?
*April 19, 2012*

**physical**

how many time outs do you get in a middle school backetball game. how many fouls have you gotten when you foul out of a middle school basketball game. what does B.E.E.F stand for? how long is a full time out. what is the size OF a girls basketball how high is the basketball ...
*April 17, 2012*

**physical science**

Sarah lifts a 345 g shopping bag a distance of 1.2 meters onto a shelf. How much work was done?
*April 12, 2012*

**Algebra**

What is the solution set to 8x + 11 = 8x + 8
*April 10, 2012*

**physics**

A horizontal water main with a cross-sectional area of 206 cm2 necks down to a pipe of area 42.4 cm2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 71.0 kPa. Determine the flow rate through the system, taking the fluid to...
*April 9, 2012*

**physics**

thank you!!!
*April 9, 2012*

**physics**

an isolated quantity of an ideal gas at 297.2 K has a volume of 14.96 L at a pressure of 1.63 atm. What is the volume of this gas sample when the absolute temperature is reduced to one third and the pressure is divided by five?
*April 9, 2012*

**TRIG**

Factor 4cos^2x+4cosx-1=0
*April 7, 2012*

**Trig**

Factor 4cos^2x+4cosx-1=0
*April 7, 2012*

**Alg1, Factoring**

how to factor x^2+2x-3=0
*April 6, 2012*

**Alg1**

how to factor x^2+2x-3=0
*April 6, 2012*

**math**

Imagine making a tent in the shape of a right prism whose cross-section is an equilateral triangle (the door is on one of the triangular ends). Assume we want the volume to be 2.2 m3, to sleep two or three people. The oor of the tent is cheaper material than the rest: assume ...
*April 6, 2012*

**physics**

A recreational (open) hot air balloon (i.e., Pinside is approximately the same as Poutside) has a volume of 2227 m3 when fully inflated. The total weight of the balloon, basket, ballast and pilot is 1775.6 N (399 lb). How much less dense must the air in the balloon be than the...
*April 4, 2012*

**English**

("Hannibal" p.16-17)
*April 3, 2012*

**statistics**

A researcher wishes to estimate the mean weekly wage of the several hundreds of workers employed by a certain firm within plus or minus 20USD and with a 99% degree of confidence.&...
*April 3, 2012*

**Two Multiple Choice American Government Questions**

The chief way the federal government raises revenue is from borrowing money foreign aid individual income taxes corporate taxes This concept means that the total federal budget changes only a little from one year to the next. reconciliation fiscal policy money economy ...
*April 2, 2012*

**MATH HELP! **

i have write the equation as a single logarithm 2 lnx-3 lny+1/2 lnz
*April 1, 2012*

**physics please help:)**

A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door by the air, assuming...
*April 1, 2012*

**Math**

the height, at a given time, of a child above the ground when the child is on the trampoline is shown in the table. determine a algebraic model for the data. Then use the model to predict when the child will reach a height of 3m Time height in metres 0 1m 0.5 4.5 1 6 1.5 4.5 2 1
*March 31, 2012*

**chemistry**

Construct the octahedral crystal-field splitting diagram for the metal in each species. Cr4+ Mn(H2O)6^2+
*March 30, 2012*

**chemistry**

Which of these ions have one d electron in the outmost d subshell? Zn2+ Fe2+ y2+ Cd2+ Sc2+ Hg2+ Tc2+
*March 30, 2012*

**chemistry**

ok thanks
*March 30, 2012*

**chemistry**

Which of these ions have five d electrons in the outermost d subshell? Mn2+ Fe2+ Re2+ Y2+ Tc2+ Zn2+ Ru2+
*March 30, 2012*

**chemistry**

what are the chemical formula for sodium tetrachloroplatinate(II) and tris(ethylenediamine)cobalt(III) bromide
*March 30, 2012*

**chemistry**

How many outer-shell d electrons are there in each of the following transition-metal ions? Re(III) Sc(III) Ru(IV) Hg(II)
*March 30, 2012*

**chemistry**

Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.
*March 30, 2012*

**6th grade math**

35/(2+5)(2^3)-15
*March 28, 2012*

**physics**

A mass of 0.7 kg is attached to the end of a massless spring of spring constant 0.35 N/m. It is released from rest from an extended position. After 0.8 s, the speed of the mass is measured to be 1.5 m/s. What is the amplitude of oscillation? What is the total energy (relative ...
*March 28, 2012*

**physics**

A 390.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.15 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? ...
*March 28, 2012*

**physics**

A cylinder of mass M=58 kg, radius R=1.3 m and moment of inertia I=(1/2)MR2 is initially rotating around its central axis with an angular velocity ωi= 1.8 rad/s. A tangential force F of constant magnitude applied to the edge of the cylinder during 5.9 s brings it to rest...
*March 25, 2012*

**physics**

A bug that has a mass mb = 1 g walks from the center to the edge of a disk that is freely turning at 38 rpm. The disk has a mass of md = 11 g. If the radius of the disk is R = 30 cm, what is the new rate of spinning in rpm?
*March 25, 2012*

**chemistry**

using the following mechanism, determine the rate law. 2A <-- --> B+C B+D --> E 2A + D --> C + E k=? please indicate which k you are using for which equation
*March 25, 2012*

**chemistry**

The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH --> CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.135 M, the rate of the reaction is 0.0070 M/s. (a) What is the rate of the reaction if the concentration of CH3Br is doubled? (b...
*March 24, 2012*

**chemistry**

A particular reactant decomposes with a half-life of 103 s when its initial concentration is 0.397 M. The same reactant decomposes with a half-life of 213 s when its initial concentration is 0.192 M. what is the reaction order and rate constant
*March 24, 2012*

**chemistry**

A particular reactant decomposes with a half-life of 103 s when its initial concentration is 0.397 M. The same reactant decomposes with a half-life of 213 s when its initial concentration is 0.192 M. Determine rate order and rate constant.
*March 24, 2012*

**chemistry**

The rate constant for this first-order reaction is 0.320 s–1 at 400 °C. A--> Products How long (in seconds) would it take for the concentration of A to decrease from 0.830 M to 0.220 M?
*March 23, 2012*

**chemistry**

The reaction described by this equation O3(g) + NO(g) -- O2(g) + NO2(g) has the following rate law at 310 K. rate of reaction = 3.0x10^6 M^-1 s^-1)[O3][NO] Given that [O3]=2.0× 10–4 M and [NO]=2.0× 10–5 M at t=0, calculate the rate of the reaction at t=0.
*March 23, 2012*

**physics**

A vibration platform oscillates up and down with an amplitude of 8.8 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter?
*March 23, 2012*

**chemistry**

I really don't understand rate law. Could you explain that and help with this problem please? Determine the average rate of change of B from t=0 s to t=202 s. A-->2B Time (s) Concentration of A (M) 0 0.74 101 0.45 202 0.16
*March 23, 2012*

**physics**

Thank you!
*March 23, 2012*

**physics**

A 55.0 kg circus performer oscillates up and down at the end of a long elastic rope at a rate of once every 7.20 s. The elastic rope obeys Hooke's Law. By how much is the rope extended beyond its unloaded length when the performer hangs at rest?
*March 23, 2012*

**physics**

A spherically symmetric object, with radius R = 0.50 m and mass M = 1.3 kg, rolls without slipping across a horizontal floor, with velocity V = 2.1 m/s. It then rolls up an incline with an angle of inclination θ = 25° and comes to rest a distance d = 3.0 m up the ...
*March 21, 2012*

**Geometry ONE MULTIPLE CHOICE QUESTION PLEASE HELP!**

Thank you! Yes that helps! :D
*March 20, 2012*

**Geometry ONE MULTIPLE CHOICE QUESTION PLEASE HELP!**

The vertices of a triangle are P(–4, 1), Q(–2, –8), and R(8, –1). Name the vertices of the image reflected across the x-axis. P'(–4, –1), Q'(–2, 8), R' (8, 1) P'(4, –1), Q'(2, 8), R'(–8, 1) P'(4, 1), Q&#...
*March 20, 2012*

**math**

integreal 3cot^2 4xdx
*March 19, 2012*

**physics**

Two children, each with mass m = 11.0 kg, sit on opposite ends of a narrow board with length L = 4.5 m, width W = 0.30 m, and mass M = 9.4 kg. The board is pivoted at its center and is free to rotate in a horizontal circle without friction. What is the rotational inertia of ...
*March 16, 2012*

**physics**

Three particles, each of mass 3.0 kg, are fastened to each other and to a rotation axis by three massless strings, each 0.360 m long, as shown in the Figure. The combination rotates around the rotation axis with an angular velocity of 19.0 rad/s in such a way that the ...
*March 16, 2012*

**physics**

The following objects are released from rest and allowed to roll down an inclined plane. Rank the objects by the order of which they will arrive at the bottom of the incline. (1 = the first to arrive, 2 = the second, etc.) I = 2611 kg*m^2, M = 50 kg, R = 0.8 m I = 2883 kg*m^2...
*March 16, 2012*

**physics**

A ball of radius 0.211 m rolls along a horizontal table top with a constant linear speed of 3.41 m/s. The ball rolls off the edge and falls a vertical distance of 2.27 m before hitting the floor. What is the angular displacement of the ball while the ball is in the air?
*March 16, 2012*

**physics**

A train is rounding a circular curve whose radius is 1.87E+2 m. At one instant, the train has an angular acceleration of 1.51E-3 rad/s2 and an angular speed of 0.0470 rad/s. Find the magnitude of the total acceleration (centripetal plus tangential) of the train.
*March 16, 2012*

**physics**

A race car, starting from rest, travels around a circular turn of radius 20.8 m. At a certain instant, the car is still accelerating, and its angular speed is 0.515 rad/s. At this time, the total acceleration (centripetal plus tangential) makes an angle of 35.1° with ...
*March 16, 2012*

**physics**

A lunch tray is being held in one hand, as the figure below illustrates. The mass of the tray itself is 0.182 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.08 kg plate of food and a 0.279 kg cup of coffee. Assume L1 = 0.0590 m, L2 = 0....
*March 16, 2012*

**english**

what's a semiotic analysis? I've never heard of it and my teacher won't explain it. He says we have to use quotes from 2 articles also but when I put them in he yells and says to develop my own ideas. I don't get it.
*March 16, 2012*

**english**

The subject of this unit is the role of those mythologies which determine the meaning of being male or female in American culture. As always, your aim as a writer is to incorporate what the critics have been arguing into your own thinking, thereby to enter into a discussion ...
*March 16, 2012*

**Chemistry **

What is the value of Kf for the formation of the ammine M(NH3)2+ ? Assume the concentration of M(NH3)n+ = 0.0020 M The data were graphed giving a straight line plot with an equation of y = -5.9484x - 9.74. .
*March 15, 2012*

**physics**

A solid rod of mass M = 1.00 kg and length L = 85 cm is suspended by two strings, each with a length d = 83 cm (see Figure), one at each end of the rod. The string on side B is cut. What is the magnitude of the initial tangential acceleration of end B? The string on side B is ...
*March 13, 2012*

**physics**

The mass of the tray itself is 0.182 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.08 kg plate of food and a 0.279 kg cup of coffee. Assume L1 = 0.0590 m, L2 = 0.138 m, L3 = 0.258 m, L4 = 0.381 m and L5 = 0.401 m. Obtain the force T ...
*March 13, 2012*

**math**

15/23 in lowest terms yes or no
*March 12, 2012*

**physics**

A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...
*March 11, 2012*

**physics**

A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...
*March 11, 2012*

**physics**

The rope of a swing is 3.2 m long. Calculate the angle from the vertical at which a 95-kg man must begin to swing in order to have the same kinetic energy at the bottom as a 1500-kg car moving at 1.07 m/s (2.39 mi/hr).
*March 11, 2012*

**physics**

A constant force of 40.7 N, directed at 29.9° from horizontal, pulls a mass of 13.7 kg horizontally a distance of 2.93 m. Calculate the work done by the force.
*March 11, 2012*

**physics**

An automobile tire has a radius of 0.455 m, and its center moves forward with a linear speed of v = 15.7 m/s. Determine the angular speed of the wheel.
*March 11, 2012*

**physics**

Starting from rest at t = 0 s, a wheel undergoes a constant angular acceleration. When t = 1.6 s, the angular velocity of the wheel is 5.5 rad/s. The acceleration continues until t = 17 s, when the acceleration abruptly changes to 0 rad/s2. Through what angle does the wheel ...
*March 11, 2012*

**math**

"joyce is decorating her store window for a going-out-of-business sale. she wants to design some art that looks like the diagram shown below. She will paint the shaded portion. How many square meters will she need to paint?"
*March 8, 2012*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*March 5, 2012*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*March 5, 2012*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect
*March 5, 2012*

**Trig**

Prove (3cosθ-4sinθ)^2+(4cosθ+3sinθ)^2=25
*March 5, 2012*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*March 5, 2012*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*March 5, 2012*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect
*March 5, 2012*

**trig**

Q1: Prove cos^2t+4cost+4/cost+2=2sect+1/sect Q2: A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*March 5, 2012*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α please help... this is the only one I didn't understand out of all my homework...
*March 5, 2012*