Saturday
October 25, 2014

Posts by Mandy


Total # Posts: 497

Chemisty
In the titration of total acid with sodium hydroxide, NaOH, it was determined that 36.03mL of 0.0980M NaOH was needed to neutralize all the acid in a 10.0mL aliquot of a powdered drink mix solution. In a second titration, it was determined that were 1.45 x 10^(-5) moles of ...
October 22, 2014

Chemisty
Consider the reaction of sulfuric acid, H2SO4, with sodium hydroxide, NaOH. H2SO4(aq) + 2 NaOH(aq) -> 2H2O(l) + Na2SO4(aq). Suppose a beaker contains 35.0mL of 0.175M H2SO4. How many moles of NaOH are needed to react completely with sulfuric acid? Thank you
October 22, 2014

Chemistry
What volume of 5.0 M H2SO4 should be diluted to 100mL to prepare a 0.25 M H2SO4 M solution? I know the molar mass of H2SO4 is 98g but I'm not sure where exactly that fits in and how I'm supposed to get it to be diluted. Thank you!
October 8, 2014

Psychology
analyze the function of emotions as motive.
July 19, 2014

economics
Using an aggregate demand and supply diagram, explain how each of the following scenarios affects the equilibrium price level and aggregate output. Consider first the short-run, then the long-run equilibrium for each scenario. a) Consumers expect a recession, while resource ...
July 15, 2014

math
There are 25 red beads,x blue beads and y green beads in a box.When a bead is picked at random,the probability that it is blue is 1 over 4 and the probability that it is green is 1 over 3. (a)Find the value of x and y. (b)How many blue beads must be added so that the ...
July 7, 2014

Riddle
Haha wow..
July 7, 2014

math
In a bag,there are 18 cards of which x cards are coloured and the rest are white.When another 6 white cards are added into the bag,the probability of a white card being picked is x over 8.Find the value of x. Answer:6 How?
July 7, 2014

add maths
A point P moves so as to satisfy the ratio OP:PA=1:3,where O is the origin and A is the point (-4,0).Find the equation of the locus of P.
June 14, 2014

add maths
A point moves such that its distance from point A(1,0) is twice its distance from B(-2,0).Find the equation of the locus of the point.
June 14, 2014

chemistry pls help me asap
Thanks a lot^^
May 15, 2014

chemistry pls help me asap
2.08g of metal Y react with 0.96g of oxygen to form a metal oxide.The empirical formula of the metal oxide is Y2O3.What is the relative atomic mass of metal Y.
May 15, 2014

chemistry
Solution A:50cm^3 of 1.0mol dm^-3 hydrochloric acid,HCl Solution B:10cm^3 of 2.0mol dm^-3 hydrochloric acid,HCl (a)Calculate the number of moles of hydrochloric acid,HCL in each solution. (b)Solution A and B are mixed together. (i)Calculate the number of moles of hydrochloric ...
May 7, 2014

chemistry pls help me asap
100cm^3 of a sodium hydroxide,NaOH solution contains 4.0g of solid sodium hydroxide,NaOH.40 cm^3 of phosphoric acid,H3PO4 is needed to neutralise 40cm^3 of the alkali.(RAM:H,1;O,16;Na,23;P,31) (a)Calculate the molarity of the sodium hydroxide,NaOH solution. (b)Calculate the ...
May 7, 2014

chemistry
200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium hydroxide,NaOH solution ...
May 7, 2014

chemistry
A student dissolved 3.65 g of hydrogen chloride gas,HCL in water to make 1.0dm^3 of solution.Calculate the volume of a 0.1 mol dm^-3 barium hydroxide,Ba(OH)2 solution required to completely neutralise 25.0 cm^3 of the acid solution.(RAM:H,1;CL,35.5)
May 7, 2014

chemistry
The volume of 0.15 mol dm ^-3 sulphuric acid,H2SO4 required to completely neutralise 25.0cm^3 of potassium hydroxide,KOH solution.
May 7, 2014

chemistry
50.0cm^3 of 2.0 mol dm^-3 aluminium sulphate,Al2(SO4)3 solution Calculate the number of moles of ions.
May 7, 2014

chemistry
Concentrated phosphoric acid,H3PO4 was added slowly into some water to produce 5.0dm^3 of a dilute acid solution.100g of the pure phosphoric acid,H3PO4 was present in the solution.Find the concentration of the acid,in g dm^-3.
May 5, 2014

chemistry
Calculate the volume of 2.0 mol dm^-3 sulphuric acid,H2SO4 needed to prepare 2.5 dm^3 of 0.5 mol dm^-3 of the same acid solution.
May 5, 2014

add maths
Find the equation of the perpendicular bisector of the straight line joining the points A(-1,0)and B(3,4).
May 5, 2014

add maths
Given that log2 3=h and log2 5=k, express log2 0.45 in terms of h and k.
May 3, 2014

add maths
Given that x=a^m and y=a^n.Express log^a(3 square root x over ay^2) in terms of m and n.
May 3, 2014

add maths
calculate the value of log square root p p^2.
May 3, 2014

add maths
Find the value of logb square root b - loga(1/a)
May 3, 2014

math
Oh thanks..its 2^5=32..
April 2, 2014

math
Given a set with n elements has 2^n subsets.Find the number of subsets for set A={2,3,5,7,11}.
April 2, 2014

add maths
10^2n+3 × 20^n × 5^n Step:? Answer:10^4n+3
April 2, 2014

Algebra
If a salesman earned 6% commissions on sales, and in one week he earned $300 in commissions, how much merchandise did he sell that week?
March 19, 2014

Business Math
True Value received an invoice dated 4/28/12. The invoice had a $5,700 balance that included $600 freight. Terms were 5/10, 4/30, n/60. True Value pays the invoice on May 12. What amount does True Value pay?
February 27, 2014

Business Math
A local Barnes and Noble paid a $79.33 net price for each calculus textbook. The publisher offered a 10% trade discount. What was the publisher’s list price? (Round your answer to the nearest cent.)
February 27, 2014

add maths
f(x)=3x^2-12x+20 Find minimum value and value of x
February 23, 2014

logarithms
3^x=6
February 19, 2014

Business Math
Rainfall for May in Fiji averages 9" according to World Travel Guide. This year it rained 5% less. How many inches did it rain this year?
February 19, 2014

math 3
45 feet
February 12, 2014

Physics
Where do you get the 14.4*10^16 from?
February 5, 2014

Physics
If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
February 5, 2014

add maths
Given that the quadratic equation is (2m+3)x^2+(4m-2)x-(m+1)=0.Find the value of m,if •one of the root of the equation is negative •one of the root of the equation is reciprocal of the other
February 2, 2014

maths
The sum of a number and four times its reciprocal is 5.Find possible values of the number.
January 28, 2014

add maths
2+square root 3 & 2- square root 3 Form equation ..
January 27, 2014

add maths
2+square root 3 & 2- square root 3 Form equation ..
January 27, 2014

maths
Thank you^^
January 26, 2014

maths
A woman is now 4 times older than her daughter.Six years ago,the product of their ages was 136.Find their present ages.
January 26, 2014

add maths
x^2-17x+52=0 The answer is 4,13 But i dont know how to do..
January 26, 2014

add maths
x^2-17x+52=0 The answer is 4,13 But i dont know how to do.. ASAP...
January 26, 2014

maths
The question answer is x=8,10....how to get it..pls help me..
January 25, 2014

maths
The product of two consecutive even numbers os 80.Find the values of the numbers.
January 25, 2014

maths
The area of the right angled triangle abc (x+4)(x+3) is twice the area of a square with sides x cm.Write a quadratic equation in terms of x.
January 23, 2014

maths
Ravi bought x toys for 27$ and 3 mechanical pencils for x$.Given that the total cost of a toy and a mechanical pencil is 6$,write a quadratic equation in terms of x.
January 23, 2014

add maths
Function f and g are defined by f:x→4-x and g:x→px^2+q where p and q are constants.Given that the composite function gf:x→x^2-8x+11,find the values of p and q.
January 22, 2014

Science
Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject! 1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot ...
January 21, 2014

add maths
A function f is defined by f:x→(x+1)/ (x-1), x is not equal to 1. If f^2(2)=3f^-1(k),find the value of k.
January 21, 2014

add maths
Functions f and g are defined by f:x→3 /(x+2),x is not equal to k . No.1~State the value of k
January 21, 2014

add maths
Functions f and g are defined by f:x→3 /(x+2),x is not equal to k . No.1~State the value of k
January 21, 2014

add maths
Still didnt get k=-2..no 2 i know alrdy..thnks
January 21, 2014

add maths
The no. 1 how to do? Your answer in my book is right but i dont know how to do the step
January 21, 2014

add maths
I still cant get the k is -2..
January 21, 2014

add maths
Can you show me the step how to get -2?
January 21, 2014

add maths
Question no 2 Find the value of p for which f(4)=g^-1(p)
January 21, 2014

add maths
Functions f and g are defined by f:x→3 over x+2,x is not equal to k and g:x→2x+1. No.1~State the value of k
January 21, 2014

add maths
(x+1)/(x-1)
January 21, 2014

add maths
A function f is defined by f:x→x+1 over x-1,x is not equal to 1.If f^2(2)=3f^-1(k),find the value of k.
January 21, 2014

add maths
A function f is defined by f:x→x+10 over x-8,x not equal to 8.Find the values of x for which f^-1(x)=x.
January 21, 2014

add maths
No.1 y=3x/x-3 x=3y/y-3 xy-3y=3x y(x-3)=3x y=3x/x-3 f^-1(x)=3x/x-3,x≠3 Am i correct ?:D
January 21, 2014

add maths
Ohh...ok..thank you!
January 21, 2014

add maths
Reiny,thanks a lot! You are right...can you explain why the answer x is not equal to 1 ?
January 21, 2014

add maths
Find f^-1 in similar form for each of the following functions. Question no. 1 ↓ f:x→3x over x-3,x not equal to 3 Question no. 2 ↓ f:x→2x+4 over 2x-1,x not equal to 1over2
January 21, 2014

add maths
Functions f and g are defined by f:x→ax-b,where a and b are constants and g:x→x+5.Given that fg(1)=11 and gf(2)=8. Calculate the values of a and b? What are the values of fg(-1)and gf(3)
January 14, 2014

add maths
If f:x→4x+5,find the composite function f^2.Hence,find f^2(1over2)and f^2(-2) ? The value of x gor which f^2(x)=9
January 14, 2014

History!
Can someone please help me? Thanks! I'm really behind and i need to get caught up and i just really need some help! Thanks!! :) 1. As a result of the French and Indian War, _____ claimed all land west of the Mississippi River, and _____ gained control of all land east of ...
December 18, 2013

Chem
A 0.170-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
December 5, 2013

Chemistry
Which of the following will be more soluble in an acidic solution than in pure water? AgI, Ni(OH)2, KClO4, SrSO4, CaCO3
December 5, 2013

Chemistry
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
December 5, 2013

Chemistry
Calculate the pH at the equivalence point for the titration of 0.180 M methylamine (CH3NH2) with 0.180 M HCl. The Kb of methylamine is 5.0× 10–4.
December 5, 2013

chemistry
For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3
October 30, 2013

chemistry
For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3
October 30, 2013

Math
1300cm2=_____ m2
July 30, 2013

chemistry
calculate the Ph of 0.3 M sodium propanoate, Ka 2.0 x 10 base -3. then calculate the pH after 0.03 mol NCL is added to 2L of the first solution.
July 20, 2013

Applied Geometry maths
A Maths Applied student holidaying in Sydney notices that the Centrepoint tower has an angle of elevation of 15deg20'. After walking 400m directly towards the tower she now observes the elevation to be 24deg33'
June 19, 2013

Algebra
How do i factor this problem completely? 216x^3 - y^3
May 19, 2013

physics
What is the magnitude of the electrostatic force on a +5 C harge 1.75 m to the left of a -2.5 C Charge? (show your work)
May 14, 2013

english
so you said arguments is logos
May 8, 2013

english
IN Rachel carson essay FABLE FOR TOMORROW she used only the pathos and ethos Right?
May 8, 2013

english
should be ETHOS
May 8, 2013

english
Fable for tomorrow This town does not actually exist, but it might easily have a thousand counterparts in America or elsewhere in the world. I know of no community that has experienced all the misfortunes I describe. Yet every one of these disasters has actually happened ...
May 8, 2013

english
Pathos
May 5, 2013

english
ok i got it is LOGOS because he is using reasoning
May 5, 2013

english
At the foot of these fairy mountains the voyager may have descried the light smoke curling up from a village whose shingle roofs gleam among the trees, just where the blue tints of the upland melt away into the fresh green of the nearer landscape. It is a little village of ...
May 5, 2013

english
pathos is emotion
May 4, 2013

english
WHOEVER has made a voyage up the Hudson must remember the Kaatskill mountains. They are a dismembered branch of the great Appalachian family, and are seen away to the west of the river, swelling up to a noble height, and lording it over the surrounding country. Every change of...
May 4, 2013

Public Speaking
I'm so confused!
April 24, 2013

PS
An advantage of using media resources for researching your topic is: A. you may listen to an expert in the subject area that you are interested in. B. media resources may set you in a direction of research you did not expect. C. watching a television or radio program may spark...
April 24, 2013

Grade 12 Calculus
Evaluate each of the following. Show all your calculations. a) f'(3) if f(x)  = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...
April 15, 2013

Physics
no
March 27, 2013

physics
A body is allowed to fall from rest through a vertical height of 8.45 m. Gravitational acceleration is 9.8 mis2. Calculate the velocity of the body at the end of the fall.
January 31, 2013

math
when it came to pass out valentines each of the 24 students had valentine to give to the other students in the class how many total valentines will be passede out?
January 27, 2013

statistics
For a particular sample of 53 scores on a psychology exam, the following results were obtained. First quartile = 44 Third quartile = 68 Standard deviation = 8 Range = 55 Mean = 54 Median = 54 Mode = 71 Midrange = 64 I. What score was earned by more students than any other ...
January 27, 2013

Cultural Anthropology 101
Thanks Taylor and Ms.Sue
January 4, 2013

Cultural Anthropology 101
MS.Sue I am confused on my answer 4 i know i marked d but in the book it seems misleading because it talks about the States are at the extreme end of the social inequality continuum; they are highly stratified. A society is perceived as stratified if (a) there are marked ...
January 4, 2013

Cultural Anthropology 101
THANKS
January 4, 2013

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