Friday
July 3, 2015

Posts by jk


Total # Posts: 91

chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
April 26, 2015

AP chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
April 26, 2015

chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
April 26, 2015

precalculus
use the discriminant to determine whether the equation is a parabola, an ellipse, or a hyperbola. Then identify the angle of rotation required to eliminate the xy-term. x^2+4xy+y^2=1 5x^2-6xy+5y^2-8x+8y-8=0 9x^2+24xy+16y^2=25
April 22, 2015

precalculus
find the eccentricity to identify the conic, then sketch the conic and its directrix r=1/1-cos theta r=2/3+2 sin theta r=4/1-2 cos theta
April 22, 2015

precalculus
find the eccentricity to identify the conic, then sketch the conic and its directrix r=1/1-cos theta r=2/3+2 sin theta r=4/1-2 cos theta
April 22, 2015

precalculus
find directrix of 1/1-cos theta
April 22, 2015

precalculus
so its y^2-2y=x not solving for y?
April 22, 2015

precalculus
how do you eliminate the parameters for x=1-t^2 and y=1+t?
April 22, 2015

pre-calculus
find directrix of 2/3=2 sin theta
April 22, 2015

pre-calculus
how do you eliminate the parameters for x=1-t^2 and y=1+t?
April 22, 2015

pre-calculus
i didnt get a circle by using 0, pi/6, pi/4, pi/3, and pi/2?
April 22, 2015

pre-calculus
how to graph equation?
April 22, 2015

pre-calculus
what is the graph for this equation?
April 22, 2015

pre-calculus
why squared?
April 22, 2015

pre-calculus
eliminate parameters of x=1+cos t y=1-sin t graph the parametric equations
April 22, 2015

precalculus
find an hyperbola equation with foci (0, +/-8) and asymptotes; y=+/-1/2x?
April 16, 2015

precalculus
find a hyperbola equation with vertices (o,+-4) and passes through the point (3,-5)
April 16, 2015

chemistry help
a 3.54 grams solid sample of an unknown monoprotic acid was dissolved in distilled water to produce a 47.0 mL solution at 25 degrees. This solution was then titrated with 0.2 M NaOH. The equivalence point was reached when 35.72 mL of 0.2 M NaOH was delivered. A. find the ...
April 1, 2015

chemistry help
In the following questions, assume that no excess distilled water was added from a wash bottle during the titration of 10.00 mL of vinegar with your standardized solution of NaOH. A. calculate the pH of vinegar. B. what was the pH of the solution after 4.00 mL of titrant was ...
April 1, 2015

chemistry help
A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. B. How many moles of NaOH were delivered? C. How many ...
April 1, 2015

chemistry
you cant solve it?
April 1, 2015

chemistry
In the following questions, assume that no excess distilled water was added from a wash bottle during the titration of 10.00 mL of vinegar with your standardized solution of NaOH. A. calculate the pH of vinegar. B. what was the pH of the solution after 4.00 mL of titrant was ...
April 1, 2015

chemistry
A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. A. what volume of 0.35 M NaOH was delivered? B. How many...
April 1, 2015

chemistry
finding all the answers
April 1, 2015

chemistry
a 3.54 grams solid sample of an unknown monoprotic acid was dissolved in distilled water to produce a 47.0 mL solution at 25 degrees. This solution was then titrated with 0.2 M NaOH. The equivalence point was reached when 35.72 mL of 0.2 M NaOH was delivered. A. find the ...
April 1, 2015

easy math
√(100 - 20√5 + 5 + 15 - 6√15 + 9) solve.
March 31, 2015

precalculus help
Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)? do not even know how to apply demoivre theorem?
March 31, 2015

precalculus
algebraically identify the symmetries of r=2sin(2theta)
March 31, 2015

Philosophy
evolbiol.ru/blankslate/blankslate.htm‎
March 31, 2015

precalculus
Let u have a length of 20 and direction of 60 degrees, and v= 5i-3j what is u? what is abs(2v-u)?
March 31, 2015

precalculus
Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)?
March 31, 2015

precalculus
Let u= <3,1> and v=<6,-1> A. what is the angle between u and v? B. find projvU C. reoslve u into u1 parallel to v abd U2 perpendicular to v.
March 31, 2015

us history
free soil party
March 31, 2015

precalculus
B. find projected vU C. resolve u into u1 parallel to v and U2 perpendicular to v.
March 31, 2015

precalculus
Let u= <3,1> and v=<6,-1> A. what is the angle between u and v? B. find projvU C. reoslve u into u1 parallel to v abd U2 perpendicular to v.
March 31, 2015

precalculus
what are those numbers in radians
March 31, 2015

precalculus
no not at all
March 31, 2015

precalculus
Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)?
March 31, 2015

precalculus
solve the rest because i am not getting correct answer?
March 31, 2015

precalculus
Let u have a length of 20 and direction of 60 degrees, and v= 5i-3j what is u? what is abs(2v-u)?
March 31, 2015

chemistry
calculate the pH after 0.02 mol NaOH is added to 1.00 L of .1 M sodium propanoate NaC3H5O2
March 29, 2015

chemistry
PH of gatorade and body sweat
March 29, 2015

Grade 11 Chemistry
find the moles of each element then divided by total volume
March 28, 2015

SUPER HARD CHEMISTRY
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point
March 28, 2015

HARD COLLEGE CHEMISTRY
thanks
March 28, 2015

HARD COLLEGE CHEMISTRY
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
March 28, 2015

COLLEGE CHEMISTRY HARD
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
March 28, 2015

COLLEGE CHEMISTRY HARD
jai i still need help
March 28, 2015

COLLEGE CHEMISTRY HARD
calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?
March 28, 2015

college chemistry HARD
thanks
March 28, 2015

college chemistry HARD
I STILL NEED HELP WITH EQUIVALENCE POINT WITH THIS PROBLEM
March 28, 2015

college chemistry HARD
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
March 28, 2015

chemistry
calculate the ph at the equivalence point for the titration of .1 M NH3 and .1 M HCl. kb NH3= 1.8E-5 how you do it?
March 28, 2015

chemistry
calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?
March 28, 2015

chemistry
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
March 28, 2015

math - exponent laws
now you mention,yes I could have paste the link but i didn't think of it, SORRY! Thank You very much!
February 10, 2015

math - exponent laws
evaluate -(11/17^-10/(9/5)^(1/10) answer from Reiny: (-11/-17)^-10 = 1/(11/17)^10 = 77.725... (I stored that in A on my calculator) (9/5)^(1/10) = 1.0605.. so -(11/17^-10/(9/5)^(1/10) = -77.725... /1.0605... = -73.28837824 --- do we need to reciprocal -(11/17) to -(17/11) ?
February 10, 2015

MATH - exponent laws
do we need to reciprocal -(11/17) to -(17/11) ?
February 9, 2015

MATH - exponent laws
how do you evaluated this? (-)sign ↓ _ __________( -11/-17)^-10 line is divide (9/5)^1/10
February 9, 2015

math
Sam bought a new car for $26,500. The car depreciates approximately 13% of its value each year. A) What is the decay factor for the value of this car? b)  Write an equation to model the decay value of this car? c)  What will the value of the car be in 10 years?
June 27, 2014

Math
angles ABC and XYZ are complementary angles. if m < ABC is 18 more than three times m < XYZ, find < XYZ i have no idea how to do this i know that something has to equal 18+ 3m but i dont understand the (<) sings
June 15, 2014

Math
4*3 8*9
April 23, 2014

chemistry
Where is an electron in 3Py orbital most likely to be found and where does the probability it vanish?
December 26, 2013

8th Grade Science
jk
October 12, 2013

Physics (mechanics)
A u-control airplane of mass m is attached by control wires of length L and negligible mass to the "pilot" who controls the lift provided by the wing FL. The wires control the plane's elevator or angle of attack. The plane's engine keeps it moving at constant...
July 9, 2013

Alan
could anyone test ACDE??
April 13, 2013

physics
exercise 4.1 suppose the pilot start agin from rest
March 17, 2013

parallelograms
52.2
February 26, 2013

geometry
there are 4 cirlces in an equilateral triangle with sides equal to 16cm. what is the radius of the big circle and the little circles
February 25, 2013

Economics
jk
November 23, 2012

physics
jk
October 2, 2012

chemistry
for empirical formula C=3.97mg; H=0.44mg; and O=5mg-3.97mg-0.44mg=0.59mgO Then 0.59mg/16g=0.036mmol. Then you good to go! Thank you DrBob222:D
September 27, 2012

chemistry
I got the right answer by following DrBob222's step
September 27, 2012

Physics
ghhyhjytuyjiuy
September 19, 2012

SOCIAL STUDIES URGENT
OK 1:D 2:C 3:D r they right
April 30, 2012

SOCIAL STUDIES URGENT
1. The Uros people have adapted to the geography of Lake Titicaca, much like the Incas, by making islands out of (1 point)rock. sand. wood. reeds. 2. The Selva refers to the (1 point)coastal region. eastern rainforest. high mountains of Peru. Sierra. 3. Another example of how ...
April 30, 2012

Understanding percent
In the square, if part A is 1/4 of the square and part C is 1/10 of the square, what percent of the square is part B?
March 27, 2012

English
Vinegar (by Roger McGough) sometimes i feel like a priest in a fish and chips queue quietly thinking as the vinegar runs through how nice it would be to buy supper for two (1967) Poem for Roger McGough (by Adrian Henri) A nun in a supermarket standing in the queue Wondering ...
December 11, 2011

english
Vinegar (by Roger McGough) Poem for Roger McGough (by Adrian Henri) sometimes A nun in a supermarket i feel like a priest standing in the queue in a fish and chips queue Wondering what it’s like quietly thinking To buy groceries for two. as the vinegar runs through (1967...
December 11, 2011

Physics 203
7890
April 26, 2011

Chemistry
How many moles of oxygen atoms are contained in 1.86 x 10-2 mol CuSO4·5H2O
March 22, 2011

Physics 3
ip
February 5, 2011

Algebra 1
Nico drives from school to the store at 25 miles per hour. He drives back to the school (along the same route) at 35 miles per hour, and the returns to the store (via the same route) travelling at 40 miles per hour. Find the average rate for the three trips. Round your answer ...
October 30, 2010

Organic Chemistry
Benzyl chloride, through a primary halide, readily a precipitate when treated with 2% ethanolic silver nitrate. Why?
October 25, 2010

math
A ferris wheel is 35 meters in diameter,and can be boarded at ground level. The wheel turns in a counterclokcwise direction, completing one full revolution every 5 minutes. Suppose that a t=0 you are in the three o'clock position. Write a formula, using the sine function ...
August 13, 2010

math
sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y) prove this identity
August 13, 2010

enlgish
Last night, lucy and Neil met Morey in Gramercy Park. 1. The object of the verb is.? 2. the predicate of the sentence is?
September 2, 2009

French
Is "je suis allé souvent" correct or should it be "je suis souvent allé?" Thanks
January 4, 2009

psy
OMG that is exaclty how I was feeling when reading the text. I know Im not stupid but when I read the explanations I do feel a little slow because I know its not that hard to figure out. So why do they make it something so easy seem difficult
October 30, 2008

Precalculus with trigonometry
09
October 23, 2007

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