Jessica

I love this drink from Tommy Bahamas restaurant and if anyone has the recipe I would be forever grateful!

It's official name is the baileys banana colada

Thank you

For the electrolysis described below:

what volume of pure oxygen gas is evolved at 16°C and 768 Torr for every kilogram of gold produced??

4Au(CN)4- + 12OH- 4Au + 16CN- + 3O2 + 6H2O

My attempt: (.00375*.0821*289.15)/1.01 ATM

= .08809 L but that is incorrect. Please explain.

Answer the following questions by selecting the appropriate half-reaction. Assume that in each case the experiment is performed in an electrolysis cell having electrodes made of non-reacting material.

Which half-reaction will take place at the cathode during the electrolysis of 1.0 M AgNO3?

2H2O --> O2 + 4H+ + 4e-

Ag --> Ag+ + e-

2H2O + 2e- --> H2 + 2OH-

Ag+ + e- --> Ag

Which half-reaction will take place at the anode during the electrolysis of 0.10M aqueous KF solution?

2H2O --> O2 + 4H+ + 4e-

H2 + 2OH- --> 2H2O + 2e-

K+ + e- --> K

2H2O + 2e- --> H2 + 2OH-

Which half-reaction will take place at the cathode during the electrolysis of molten KF?

2F- --> F2 + 2e-

F2 + 2e- --> 2F-

K --> K+ + e-

K+ + e- --> K

Which half-reaction will take place at the cathode during the electrolysis of 0.10M aqueous KF solution?

2F- --> F2 + 2e-

K --> K+ + e-

2H2O --> O2 + 4H+ + 4e-

2H2O + 2e- --> H2 + 2OH-

I know that for the cathodic reactions that the electrons will be on the right-hand side of the equation and that for anodic reactions that the electrons will be on the left-hand side of the equation. However, I am not sure where to go from there.

Thank you in advance, I will make sure to give 10 pts for a helpful response :)

The solutions at the two Pb electrodes of a concentration cell were prepared as follows:

* Cell A: A mixture of 1.00 mL of 0.0500 M Pb(NO3)2 with 4.00 mL of 0.0500 M KX (the soluble potassium salt of an unspecified monovalent ion X-).

Some PbX2(s) precipitates.

* Cell B: 5.00 mL of 0.0500 M Pb(NO3)2.

The cell potential was measured to be 0.06700 V at 25 °C.

By use of the Nernst equation, determine the concentration (M) of Pb2+ in the solution of Cell A.

In Cell A, how many moles of X- have reacted with Pb2+?

What is the concentration (M) of X- in the solution of cell A.

Calculate Ksp of PbX2.

please explain :) I will give 10 points!

1 day ago

- 3 days left to answer.

Additional Details

okay after ltrying this out for about 10 hours I finally figured out the first part!!! my concentration o Pb2+ is 0.000592M.

However, I am still stuck on the other questions.

for question 2 I thought I would just multiply the original moles times volume and then minus the concentration I found by the volume.

(0.05M*.001L)-(.000592 M*.005L) = 0.00005 mol - 0.00000296 mol = 0.00004704 mol but that is the wrong answer.

A 0.53 kg mass vibrates according to the equation x = 0.50cos 6.95 t, where x is in meters and t is in seconds.

My Answers:

Determine the amplitude.

Express your answer using two significant figures.

A =0.50 m

Part B

Determine the frequency.

Express your answer using three significant figures.

f =1.11 Hz

my answers

Part C

Determine the total energy.

Express your answer using two significant figures.

E_{\rm total} =3.2 J

Part D

Determine the kinetic energy when x = 0.30 m.

Express your answer using two significant figures.

KE =

Part E

Determine the potential energy when x = 0.30 m.

Express your answer using two significant figures.

PE =

I got everything except for the last two parts.

I know that E=PE-KE but i can`t seem to find either PE or KE...

I have a lab coming up and this is one of the practice questions that we need to do. I have no idea how to do this. I think that we need to plug in all known info into the nerst equation but i don`t know how to arrange Q or which equations to use to find Eocell. If you have any advice I would REALLY appreciate it!

The solutions at the two Pb electrodes of a concentration cell were prepared as follows:

Cell A: A mixture of 1.00 mL of 0.0500 M Pb(NO3)2 with 4.00 mL of 0.0500 M KX (the soluble potassium salt of an unspecified monovalent ion X-).

Some PbX2(s) precipitates.

Cell B: 5.00 mL of 0.0500 M Pb(NO3)2.

The cell potential was measured to be 0.05700 V at 25 °C.

By use of the Nernst equation, determine the concentration (M) of Pb2+ in the solution of Cell A.

Give values and locations of all extrema of y=2^(−|x|) where −6 < x < or equal to 5

(note: enter your answer as an ordered set ie: x{1,2,3})

I have a quiz this week and I have no idea how to do this. I tried to find the derivative and then solve for 0. but my answer of x=-6,0 and y=1 and 2^(-6) did not work.

I would truly appreciate it if someone could show me the steps so that I can learn how to solve this type of problem. I will give 10points to the first reasonable answer!!!

Thank you :)

We have just started to work with fluids in class and there are two questions in my book that I can't seem to work out.

1) A 7.07 kg piece of wood ({\rm{SG}} = 0.50) floats on water.What minimum mass of lead, hung from the wood by a string, will cause it to sink?

I thought it was 7.07 kg but that is wrong.

2)An undersea research chamber is spherical with an external diameter of 4.50 m. The mass of the chamber, when occupied, is 47100 kg. It is anchored to the sea bottom by a cable.

a)What is the buoyant force on the chamber?

b)What is the tension in the cable?

Any help would be greatly appreciated.

Thank you :)

A 20-kg sphere rests between two smooth planes as shown in Fig. 9-85. Determine the magnitude of the force acting on the sphere exerted by each plane.

I have no idea how to do this. I think that F1 + F2 + W = 0... am I right and how do I calculate each force?

I have a link to the picture.

http://www.google.ca/imgres?hl=en&client=firefox-a...

please show me how to do this so that I can practice for my exam.

Please help! I cant figure out how to do these, please explain. :)

Answer the following questions by selecting the appropriate half-reaction. Assume that in each case the experiment is performed in an electrolysis cell having electrodes made of non-reacting material.

Which half-reaction will take place at the cathode during the electrolysis of 1.0 M AgNO3?

2H2O --> O2 + 4H+ + 4e-

Ag --> Ag+ + e-

2H2O + 2e- --> H2 + 2OH-

Ag+ + e- --> Ag

Which half-reaction will take place at the anode during the electrolysis of 0.10M aqueous KF solution?

2H2O --> O2 + 4H+ + 4e-

H2 + 2OH- --> 2H2O + 2e-

K+ + e- --> K

2H2O + 2e- --> H2 + 2OH-

Which half-reaction will take place at the cathode during the electrolysis of molten KF?

2F- --> F2 + 2e-

F2 + 2e- --> 2F-

K --> K+ + e-

K+ + e- --> K

Which half-reaction will take place at the cathode during the electrolysis of 0.10M aqueous KF solution?

2F- --> F2 + 2e-

K --> K+ + e-

2H2O --> O2 + 4H+ + 4e-

2H2O + 2e- --> H2 + 2OH-

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 28.0 m/s.

a) Assuming a uniform rate of increase in angular velocity and a horizontal circular path of radius 1.20 m, calculate the angular acceleration.

b) Calculate the (linear) tangential acceleration.

c) Calculate the centripetal acceleration just before release.

d) Calculate the net force being exerted on the hammer by the athlete just before release.

e) Calculate the angle of this force with respect to the radius of the circular motion.

A piece of wire x m long is cut into two pieces, the length of the first piece being 8 m. The first piece is bent into a circle, and the other is bent into a rectangle with length twice the width. Give an expression for the total area A enclosed in the two shapes in terms of x.

Please help - will give 10 points to the best answer!!

Find all critical numbers of

f(x)=x^(8)e^(−7x)

Hint: f '(x)=(8x7−7x8)e^(−7x)

[x^(2)/4] +[ y^(2)/9] =1

find the lines that are tangent and normal to each curve at the given point: (1,(3/2)*sqrt(3))

Please show me how to do this . I'm so frustrated. I know that I need to differentiate and plug in numbers to a line but I can't gts the right answers.

xln(x)−6+2 ln(x)−3x=0

solve for x.

Thank you.

Evalutate the following limit:

If: f(x)=sin(x+2)

lim x->0 [f(0+x)−f(0)]/0=

please show work. :)

A water trough is 6 m long and its cross-section is an isosceles triangle which is 70 cm wide at the top, and the height is 70 cm. The trough is not full. Give an expression for V, the volume of water in the trough in cm3, when the depth of the water is d cm.

If you stand on a bathroom scale, the spring inside the scale compressed 0.60 mm, and it tells you your weight is 710 N. Now if you jump on the scale from the height of 1.0 m, what does the scale read at its peak.

I have tried this question over and over but I think I am missing something. I know that we are supposed to use conservation of energy...

please explain :)

Common Ion

At some other temperature, a solid sample of Ca(OH)2 is shaken with 0.0100 M CaCl2.

Once equilibrated, some solid Ca(OH)2 remains undissolved.

The solution is filtered and a 15.00 mL sample requires 20.64 mL of 0.0100 M HCl to neutralize it.

Calculate the value for Ksp of Ca(OH)2 from this data.

I found Ksp = 3.20×10-6

What is the molarity of Ca(OH)2 which is dissolved in this solution?

I found 6.88×10-3 M

What is the solubility of Ca(OH)2 in this solution, in g/100mL?

g/100mL

I can't get part c... I'm so frustrated. If someone could show me how to find the solubility I would really appreciate it. Thank you in advance.