Monday
October 24, 2016

# Posts by chloe

Total # Posts: 517

Math
An airplane is flying at an altitude of 6 miles and passes directly over a radar antenna. When the plane is 10 miles away, the radar detects that the distance is changing at a rate of 240 mph. what is the speed of the plane? This is an implicit differentiation problem
May 13, 2013

chemistry
No. this is the sample I did. Cu+(s)+/Cu2+aq)//Al3(aq)+/Al(s) is this right? Anode = Cu+(s)+/Cu2+(aq) - +0.337 Cathode = Al3+(aq)+/Al(s) - -1.66 Overall redox reactions: -0.337 - -1.66 = 1.323?
May 8, 2013

chemistry
A. Find and list all of the different half- cell combinations. Hint 15 combinations! 1. Copper/ Cu2+ 2. Lead/ Pb2+ 3. Magnesium/ Mg2+ 4. Zinc/ Zn2+ 5. Iron/Fe2+ 6. Aluminum/ Al3+ B. write the half reactions of each combination and the overall redox reaction. Please help! Thank...
May 8, 2013

Chemistry
What is the Ka of the amino acid serine if it is 34.5% dissociated at pH- 9.46?
May 4, 2013

Chemistry
ok thank you!
April 30, 2013

Chemistry
dG=? . how do I start this problem? Do I use dG= -RT*ln*K? dG=-(0.008314 kj/k*mol) (61+ 273.15) ln (29.24)?? I tried this and it is wrong.
April 30, 2013

Chemistry
DrBob222, I don't know how to solve this problem either. And yes, this is the question for this problem. I even double check it. Please help. Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of ...
April 30, 2013

Chemistry
Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of delta Gvap (in kJ) at 61'C for chloroform?
April 30, 2013

Chemistry
I realized where I made a mistake for this problem. This time, I got this one right. Thank you so much!
April 30, 2013

Chemistry
The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you! Chemistry - DrBob222, Tuesday, April 30, 2013 at 12:31am dG = dHvap - ...
April 30, 2013

Chemistry
At 20 degree celsius, Ka for an unknown monoprotic weak acid is 0.00088. Calculate the Delta G (in kJ/mol) for the reaction of this unknown acid with water. HA(aq) + H2O(l) <--> H3O+(aq) + A-(aq)
April 30, 2013

chemistry
Calculate the enthalpy of fusion of naphthalene (C10H8) given that its melting point is 128 Celsius and its entropy of fusion is 47.7 J (k*mol) .
April 29, 2013

chemistry
Given that for the vaporization of benzene Hvap= 30.7 kj/mol and Svap= 87.0 J(K * mol) , calculate Delta G (in kJ/mol) for the vaporization of benzene at 13 Celcius.
April 29, 2013

Chemistry
The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you!
April 29, 2013

Chemistry
Calculate the molar solubility of MgCO3 in a solution that already contains 1.7×10−3 M sodium carbonate. MgCO3 Ksp = 6.82 x 10-6 IMPORTANT NOTE: You must use the quadratic equation to solve this problem. (DrBob222- thank you so much for all your help!)
April 26, 2013

Chemistry
how did you get (that's 0.17M x 1/2 = 0.085M)
April 24, 2013

Chemistry
What is the ph at the equivalence point for a titration of 250 mL of 0.17M piperidine with 0.17 M nitric acid. (piperidine: Kb = 1.3 x 10-3)
April 23, 2013

Chemistry
Consider the titration of 41.2ml of 0.230 M HF with 0.220 M NaOH . Calculate the ph after the addition of 11.9ml of sodium hydroxide.(HF: Ka = 3.50 x 10-4) Please, I need step by step on on how to solve this type of problem. Thank you very much!
April 23, 2013

Chemistry
A 17.6ml sample of a monoprotic acid is titrated with 0.212M NaOH. If 69.2ml of base is required to reach the equivalence point, what is the concentration of the acid?
April 19, 2013

social studies
what wiped out most of the indigenous population of australia
April 8, 2013

Physics
Sammy Sosa
March 19, 2013

Math
There are 16 cubic boxes of erasers in a case. What are all the possible dimensions for a case of erasers ? please help need in 30 minutes or less so confused help please thanks
March 10, 2013

math
2 minutes because 8 divided by 4 = 2
March 5, 2013

Chemistry
what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
February 26, 2013

Chemistry
what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
February 26, 2013

Chemistry
what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
February 26, 2013

Chemistry
what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
February 26, 2013

CSU
what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
February 26, 2013

thank you ms. sue.my mom said the same thing.
February 4, 2013

I have 12 with a remainder of 3. my teacher wants us to round and estimate. please help! do I round it to 7 divided by 70?
February 4, 2013

what is the estimated quotient of 6 divided into 75?
February 4, 2013

math
I don't know
January 28, 2013

math
katie is 4 years younger than sylvia. let k represent katie's age and let s represent slyvia's age.
January 22, 2013

algebra
It's m-3
January 9, 2013

MATHS
Is there any reason why f(g)=g^2+3 why do we replace the x with g? Sorry steve im trying my hardest to understand this
December 19, 2012

MATHS
Thank you steve It says i need to find f(g), i got a different result for some reason help please! And also in the second part, how did you get g^-1 = (x-1)/2 Thank you steve x
December 19, 2012

MATHS
Critical help please. Level 3 maths algebraic methods is really hard. Q) Two functions f and g are defined by f:x (arrow) x^2 + 3 g:x (arrow) 2x+1 Find a) the function fg b) solve the equation f(x)=12g^-1(x) I need to show my working out, please help someone
December 19, 2012

Algebra 1
Which one is it? A or D?
December 18, 2012

Maths
If tom got 200 euro for his birthday. He spent 1.0 how much did he spend?
December 6, 2012

English
What type of poem is this ? We found his flag one bitter morning And knew our hopes had come to woe. We had come pursuing glory But ended freezing in the snow. 1. The stanza of the poem offers an example of (1 point) slant rhyme. end rhyme. perfect rhyme. * internal rhyme. I ...
December 5, 2012

science
October 24, 2012

Math
Mrs. Yale wrote a number between 35 and 48 on her board. The sum of the digits is 7. What number did Mrs. Yale write on her board?
October 23, 2012

Chemistry
3.95x10^-22
October 16, 2012

health
is it A??
October 5, 2012

English
Yes, I know what similes and metaphors are. My question is where are their examples of similes and metaphors in the story?
September 18, 2012

English
In the story The Necklace written by Guy de Maupassant what are the examples of similes and metaphors?
September 18, 2012

grammar
Everyone knows that necessity is the mother of invention. The woman who invented disposable diapers was both a woman and an inventor. Marion Donovan invented the disposable diaper in 1950, she used a regular cloth diaper, lined it with pieces cut from a shower curtain, and ...
September 10, 2012

ashworth
i go to the same school for homeschooling and i need help with the same question
July 8, 2012

The state of Confusion enacted a statute requiring all trucks and towing trailers that use its highways to use a B-type truck hitch that is presently being manufactured by only one manufacturer, which is located in Confusion. The result of this statute is that any trucker who...
June 27, 2012

chemistry
a 3.00g sample of baking soda is heated and decomposes according to the reaction below. Calculate the theoretical yield in grams for each of the three products Na2Co3. H2O, CO2
June 17, 2012

chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0
June 12, 2012

chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0
June 12, 2012

chemistry
What is the molar solubility of Sr3(AsO4)2 and the concentration of Sr^+2 and AsO4^-3 in a saturated solution at 25C? the Ksp is 1.3 E -18. Show the balanced reaction.
June 10, 2012

Math
How would I prove: 2^n + 2^n = 2^(n+1) The question asks for correct formatting in giving proof however I don't recall learning this before. Any help would be appreciated!
May 28, 2012

Math
12. A particular power boat travelling at V0 km/h when its power is turned off it will have its speed V given by V(t) = V0 x 10^-0.18t where t is the time in seconds since the engine was turned off. If this boat was travelling at 50k/h before powering down, construct a table ...
May 28, 2012

math
THANK YOU MY GOD YOU SAVED MY LIFE
March 21, 2012

Chemistry
If 150.0 grams of iron at 95.0 degrees Celcius, is placed in an insulated container containing 500.0 grams of water at 25.0 degrees Celcius, and both are allowed to come to the same temperature, what will that temperature be? The specific heat of water is 4.18 J/g degrees ...
February 22, 2012

Geometry
i have the same question in my class too so thank you
February 14, 2012

Physics
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 18.5o below the horizontal. It strikes the ground 3.30 s later. How far horizontally from the base of the building does the ball strike the ground? What ...
February 7, 2012

physics
Describe in detail an experiment to find out the half life of a radioactive material
January 31, 2012

physics science
Please can you help as I am stuck, Describe ib detail, how you would carry out an investigation to measure the density of a block of aluminium? Thankyou
January 31, 2012

physics science
Sorry can someone please so me how to do this thanks
January 31, 2012

physics science
Sorry I don't understand this I have do decribe in detail the investigation could you please give me some pointers on how to start Thanks again
January 31, 2012

physics science
Please can you help as I am stuck, Describe ib detail, how you would carry out an investigation to measure the density of a block of aluminium? Thankyou
January 31, 2012

Math
When you do a free throw, you get 2 tries 42/60=.7=7/10=70% probability(make) 10/10-7/10=3/10=30% probability (miss) 0 points= 3/10=30% 1 point= 7/10•3/10=21/100=21% 2 points= 7/10•7/10=49/100=49% To make sure it's in the range of 100 as the whole number add 3/10...
December 14, 2011

Calc
We are working on finding the intervals of convergence of power series in class. Why do we not have to test for the convergence of the endpoints for geometric series? They always seem to diverge. Is this a set rule when working with the geometric series for this type of problem?
December 1, 2011

irish
thank you they were very helpful and thank's again
November 30, 2011

irish
im sorry for being cheeky i just find this hard
November 30, 2011

irish
its not an assignment and i was only asking if anyone understood this im sorry ok
November 30, 2011

irish
25 sentences on how you WILL SPEND! a day either at the weekend or tomorrow, a school day, or any piece of writing in the future tense. in irish can you help with a couple of them please!
November 30, 2011

health and social care
can you tell me about the nature vs nurture debate please thankyou
November 16, 2011

Maths
In the spring, 80% of the sheep in a flock of sheep had lambs. of those sheep with lambs, 30% had one lamb, 40% had two lambs and the rest had 3 lambs. a total of 240 lambs were born. how many sheep are in the flock? you must show your working.
November 7, 2011

science
November 6, 2011

science
preparation of copper sulphate crystals excess copper oxide is needed above a)how do you know the solid is in excess? b)how do you remove the excess? c)what colour is the solution? d)give the next to steps to make crystals?
November 6, 2011

MATHS
the 50p is a 50p piece it says in the book it is less than 50p (money)
November 5, 2011

MATHS
November 5, 2011

MATHS
matt and ruba each have one coin. The total amount of money is less than 50p. work out the probability that exactly one of the coins is a 10p piece. assume that all possible coins are equally likely.
November 5, 2011

maths
November 4, 2011

maths
matt and ruba each have one coin. The total amount of money is less than 50p. work out the probability that exactly one of the coins is a 10p piece. assume that all possible coins are equally likely. please can you explain i have to know how to do this
November 4, 2011

CHEMISTRY
Thank you
November 2, 2011

CHEMISTRY
thank you so is AL2O3 3 elements Ca(HCO3)2 4 elements
November 2, 2011

CHEMISTRY
November 2, 2011

CHEMISTRY
how many elements in (NH4)2SO4
November 2, 2011

chemistry ASAP
name the following: H2SeO3 H2TeO2 PO3^3- HCLO4 Please explain how to find the names !!!!!
October 31, 2011

Physics
The conducting rod ab shown below makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.855 T, perpendicular to the plane of the figure. The length L of the rod is 25 cm. (a) Find the magnitude of the emf induced in the rod ...
October 19, 2011

math
what is the total price of a sweatshirt that is priced at \$48 and taxed at 6.5%?
October 11, 2011

6th
what is the sum of 3142,6328, and 4743 to the nearest thousand?
October 6, 2011

maths
a car travels at a speed of 35mph how long would it take a car to travel 7miles
October 3, 2011

physcis!
A car accelerates from rest at 4.9 m/s2. How much time does it need to attain a speed of 6 m/s?
September 18, 2011

A car accelerates from rest at 4.9 m/s2. How much time does it need to attain a speed of 6 m/s?
September 18, 2011

Physics
Two ants race across a table 65 cm long. One travels at 5.76 cm/s and the other at 3.99999 cm/s. When the first one crosses the finish line, how far behind is the second one?
September 18, 2011

Calculus
The graph A(x) has points (-3,0), (0,-2), (1,0) and (2,3). If C(x) is defined by C(x)=A(2x+3), then what is the domain and range of C and how would the graph of C(x) look like? Also, is there any way to find what the actual equation of A(x) is with the points listed above? ...
September 6, 2011

Math
a) The junior accountant is the bottleneck b) The implied utilization of the employees: Administration support person: 37.2% 3575min (how many hours he actually works)/ 9600min (his capacity, 60minx8hx20d) = 0.372 Senior accountant: 69.2% 6650min/9600min= 0.692 Junior ...
August 31, 2011

Physics
An object, that is 3.25 mm high is placed 16 cm in front of a lens. The image produced by this lens appears 6.0 cm behind the object, as the figure shows. (a) What is the focal length of this lens and what type of lens is it? (b) What is the height of the image? Is it real or ...
July 27, 2011

Physics
An object 0.600 cm tall is placed 16.5 cm to the left of the vertex of a concave mirror having a radius of curvature of 22.0 cm. (a) Draw a principle-ray diagram showing the formation of the image. (b) Calculate the position, size, orientation (erect or inverted), and nature (...
July 27, 2011

Physics
A speedboat, starting from rest, moves along a straight line away from the dock. The boat has a constant acceleration of +3.00 m/s2. A siren on the dock is producing a 755 Hz tone. Assuming that the air temperature is 20.0oC, what is the frequency of the sound heard by a ...
July 27, 2011

sciencs
what is denser, 1 grams of gold or 1 kilograms of copper? why?
July 25, 2011

physics
additional information:the distance between wire 1 and wire is 25 cm and the distance between the wire 2 and point A is 12 cm.
July 25, 2011

physics
Consider two current carrying wires shown below. The current in the wire 1 is 4.5 A in the positive x direction. Find the magnitude and direction of the current in wire 2 if the net magnetic field at point A is to be 7.5 μT in the positive z direction (coming out of the ...
July 25, 2011

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