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Raj

Questions and answers by visitors named Raj

Questions (360)

Helen has some black tiles, some white tiles and some grey tiles. She places a single row of8 tiles above her washbasin. Each
1. 4 answers
2. 2,811 views
Nine cards are numbered 1, 2, 2, 3, 3, 4, 6, 6, 6.Three of the nine cards are chosen and placed in a line, making a 3-digit
1. 5 answers
2. 4,114 views
a 500 ml portion of .0020 M Na2C2O4 solution is able to dissolve .47g of MgC2O4. What is the Ksp for MgC2O4
1. 3 answers
2. 662 views
find two positive real numbers x and y such that their product is 800 and x+2y is as small as possible
1. 4 answers
2. 3,217 views
find the number of ways of choosing a school team of 5 pupils from 6 boys and 8 girls if 3 of the boys are cousins are either on
1. 5 answers
2. 3,938 views
An examination consists of a section A, containing 10 short questions, and a section B, containing 5 long questions. Candidates
1. 4 answers
2. 1,884 views
Four fair sided dice, each with faces marked 1,2,3,4,5,6, are thrown on 7 occasions.Find the probability that the numbers shown
1. 3 answers
2. 2,637 views
The height , in meters, of 500 people are normally distributed with standard deviation 0.080.Given that the heights of 129 of
1. 4 answers
2. 1,387 views
A clerk pushes a filing cabinet of mass 22.0 kg accross the floor by exerting a horizontal force of magnitude 98 N. The
1. 4 answers
2. 2,274 views
What is the ionic strength of 0.2 M Na2HPO4 in a solution?
1. 7 answers
2. 7,141 views
Permutation and combinationA diagonal of a polygon is defined to be a line joining any two non-adjacent vertices. 1.Show that
1. 4 answers
2. 2,516 views
The curve y = (x^2-4) is translated by(2 0). Write down an equation for the translated graph.Explain
1. 6 answers
2. 3,208 views
A certain disease is present in 1 in 200 of the population.In a mass screening program quick test for the disease is used, but
1. 5 answers
2. asked by Raj
3. 1,329 views
One side of a rectangular pen is formed by a hedge. The other three sides are made using fencing.The length of the rectangle is
1. 3 answers
2. 926 views
The equilibrium between three substances, a, B and c is shown below.A(g) + B(g) C(g) Initially there were 0.1 mol of a and 0.2
1. 4 answers
2. 2,849 views
There is a diagram with the curve y=(2x-5)^4.The point P has coordinates (4,81) and the tangent to the curve at P meets the
1. 7 answers
2. 1,299 views
X follows normal distribution(400,64).Find the inter-quartile range of the distribution.👍 0 👎 0 👁 35 asked by Raj today
1. 6 answers
2. 510 views
The random variable X follows normal distribution.P(X<35)=0.2 and P(35<X<45)=0.65.Find mean and standard deviation.Answer as
1. 4 answers
2. 1,248 views
The first 2 values in ascending power of x in the expansion of (1+x) (2-x/4)^n are p+qx^2.Find the values of n,p,q.👍 0 👎 0
1. 4 answers
2. 2,132 views
A large family wedding for the Smiths will require 113 trays of sandwiches, 116 trays of hors d' oeuvres, and 144 trays of
1. 1 answer
2. 502 views
Observe that the last two digits of 7^2 are 49, the last two digits of 7^3 are 43, the last two digits of 7^4 are 01, and the
1. 1 answer
2. 465 views
Solving it would give u x = -4...but I am not sure how you would graph that. You see, a linear inequality is an inequality that
1. 1 answer
2. 829 views
AB is a diameter of a circle with centre O. P is on BA extended, and PT is tangent to the circle. Use the corollary to the
1. 1 answer
2. 546 views
The Theorum of Apollonius states in triangle ABC, if M is the midpoint of BC, then AB^2 + AC^2 = 2AM^2 + 2MC^2. Prove this
1. 1 answer
2. 1,280 views
List all permutations of the elements of the set {+, -, *)List all subsets (combinations) of the elements of the set {+, -, *)
1. 1 answer
2. 1,163 views
Find the sum of two numbers whose sum is 70 and whose product is as large as possible.Ok i got that one equation is y = 70 -
1. 2 answers
2. 639 views
What is the chemical equation for the combustion reaction between methanol and air?CH4 + O2 ==> CO2 + H2O. All hydrocarbons
1. 1 answer
2. 1,002 views
When most people are asked what makes rockets lift off they say it's caused by the push of the exploding fuel against the
1. 1 answer
2. 455 views
Calculate the period of the wave if it makes 10 vibrations in 2 seconds.Does anyone know the formula for this? frequency =
1. 1 answer
2. 1,114 views
Determine a vector of magnitude 2 that is parallel to a=(-3, 4).
1. 1 answer
2. 445 views
A hockey puck travelling at 26 m/s [E 22* S] rebounds off the board at 21 m/s [E 22* N]. The puck is in contact with the board
1. 1 answer
2. 576 views
What is the empirical distinction between emission and absorption spectra? In general terms, how did Niels Bohr explain each of
1. 1 answer
2. 686 views
Factor the following:y = (x-a)^5 . (x-c)^5 . (a-c)^5 It looks already factored to me
1. 1 answer
2. 344 views
When the halogens form ionic compounds, what is the ion charge of the halide ions?negative one
1. 1 answer
2. 541 views
What kind of isomers can amino acids form? Which isomer is present in most living organisms?
1. 1 answer
2. 356 views
What kind of isomers can amino acids form? Which isomer is present in most living organisms?don't major compounds of living
1. 1 answer
2. 593 views
Using molymods make 2 ring structures of glucose and join them through a condensation reaction between carbon 1 on one molecule
1. 1 answer
2. 458 views
How would you make a starch molecule? What is the name of the bond formed between glucose molecules?Answered above.
1. 1 answer
2. 484 views
How would you make a starch molecule? What is the name of the bond formed between glucose molecules?I think I got it. They are
1. 1 answer
2. 580 views
How do nucleaotides join to form nucleic acids? Name the bond formed.http://www.sparknotes.com/biology/molecular/structureofnucl
1. 1 answer
2. 549 views
Look up the boiling points and relative molecular masses of water, hexane, and ethanol. Try to explain the relative magnitudes
1. 2 answers
2. 626 views
How come two non-polar substances are able to easily mix?Like dissolves like. Yes, I know that, but is there any explaination to
1. 1 answer
2. 450 views
Hi, If anyone has read Hamlet...I have to write an essay showing how Hamlet is a hypocrite or similar.I need 3 main points of
1. 1 answer
2. 762 views
Hi, I'm writing an essay on how Hamlet is a participant of hypocrisy. Can anyone help me write a thesis statement. My points are
1. 1 answer
2. 569 views
Yesterday, I asked the question about my thesis statement for Hamlet. Heres what I wrote:Hi, I'm writing an essay on how Hamlet
1. 1 answer
2. 567 views
I needed to write an essay on how Hamlet is a hypocrite and my three points were that he doesn't obey his father right away, he
1. 1 answer
2. 552 views
Does the conversion of hydrogen peroxide to oxygen involve oxidation or reduction? What substance is acting as the oxidizer or
1. 1 answer
2. 723 views
I need to prove that Hamlet cares about/loves his mother or cared about her/loved her at one point.Since this is not my area of
1. 2 answers
2. 1,205 views
Write an equation to summarize the photo reaction of photosynthesis.Since this is not my area of expertise, I searched Google
1. 1 answer
2. 636 views
What are the components of a photsynthetic unit, and what roles do they play? In which part of the chloroplast are
1. 1 answer
2. 351 views
When hypochlorite ions act as an oxidizing agent, hydroxide ions are formed. What will this do to iron (II) or to iron (III)
1. 2 answers
2. 730 views
Can hypochlorite ions oxidize bromide to bromine?In acid solutions, yes. That's the old qual test for bromide. Shake a solution
1. 3 answers
2. 1,299 views
How is commercial root beer carbonated?Yeast-carbonated root beer contains a small amount of alcohol. ... which contain the same
1. 1 answer
2. 589 views
Hi,I'm writing an essay on "what makes a city world-class"...I have all of my points and everything set, I'm just stuck on how I
1. 1 answer
2. 440 views
Create a function that has a graph with the following features:Two vertical asymptotes: x=1, x=3. One horizontal: y = -1. And x
1. 1 answer
2. 417 views
4) f(x)= { 3x^2 x< and equal 1{ ax+ b x > 1 What is the relation between a and b if the function is continuous for allof x.
1. 1 answer
2. 331 views
If f(x) is a continuous function, find the constants a and b such thatf(x) = { -x -3 <= x <= -2 ax^2 + b -2<x<0 b x=0
1. 1 answer
2. 446 views
How is Hamlet hypocritical with Rosencrantz and Guildenstern? Provide 2 examples.Please note that <b>we don't do students'
1. 1 answer
2. 1,097 views
Express in exponential form:y = -log x with base 2 the - in front is like a -1 multiplied so write it as y = log<sub>2</SUB>
1. 1 answer
2. 450 views
Find the inverse of each relation:y = (0.5)^(x+2) and y = 3log base 2 (x-3) + 2 For the first one I got y=log base 0.5
1. 1 answer
2. 777 views
Why can't a equal 1 in y=log(base a) x.And why is x always positive in that? Hmmmm. a^y=x (from the problem statement). If a
1. 1 answer
2. 986 views
I have to modernize an Ancient Greek myth, does anyone have any ideas?Sure. Reset the place and time of the Siren sisters
1. 1 answer
2. 371 views
I posted this yesterday, that I need to modernize an Ancient Greek myth.bobpursely replied with an idea that I could do the
1. 1 answer
2. 486 views
How is Hamlet a hypocrite towards Ophelia?I have one example, which is that he says he loves her but is the cause of her death
1. 1 answer
2. 852 views
Zn + PbCl2 --> ZnCl2 + PbThe initial mass of a zinc strip is 2.684. After being left overnight in a lead (II) chloride solution,
1. 1 answer
2. 747 views
Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction:HCO3^- +
1. 2 answers
2. 795 views
Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction:H20 + H20
1. 1 answer
2. 894 views
Classify the following as: Weak or strong acid, weak or strong base, salt (from weak/strong acid and base). If appropriate,
1. 1 answer
2. 1,146 views
Calculate the pH of a solute where 24.5 mL of 0.1 mol/L HCl is added to 25.0 mL of 0.1 mol/L NaOH.How much excess OH is there?
1. 1 answer
2. 425 views
Calculate the end point pH, when 25 mL of 0.01 mol/L HCl solution reacts exactly with 25 mL of 0.1 mol/L NH4OH solution.NH3 Kb =
1. 3 answers
2. 813 views
Are propane, methoxymethane, and ethanol soluble in water?yes http://www.chem.lsu.edu/lucid/tutorials/solubility/Solubility.html
1. 2 answers
2. 783 views
What is wrong with the following reasoning???f(x) = 2^x f'(x) = x[2^(x-1)] Although n x^(n-1) is the derivative of x^n, you
1. 2 answers
2. 565 views
A spherical balloon with a radius "r" inches has volume V(r)=(4/3)(pi)(r^3). Find the function that represents the amount of air
1. 2 answers
2. 784 views
A 35 mL solution of HCl, reacts completely with 20 mL of 0.25 M KBr. What is the molarity of the HCl solution?
1. 3 answers
2. 428 views
0.658 g of potassium bromate and 0.562 g of silver nitrate are added to 388 mL water. Solid silver bromate is formed, dried, and
1. 4 answers
2. 2,404 views
Find all values of x in the interval [0, 2 pi] that satisfy 2 cos x-1 = 0.cos x = 1/2 x = 60 How do I find the other value of x?
1. 2 answers
2. 762 views
At what latitude (on Earth) is the elevation of the South Celestial Polegreatest?
1. 3 answers
2. 403 views
If 1.000 kcal of heat is added to 1.700 L of oxygen in a cylinder at constant pressure of 1.00 atm, the volume increases to
1. 4 answers
2. 1,748 views
A sample of solid monoprotic acid with molar mass equal to 137.9 g/mol was titrated with 0.1879 M sodium hydroxide solution.
1. 3 answers
2. 573 views
If the distance between two objects is tripled, by what factor will thegravitational force between them change?
1. 6 answers
2. 692 views
Mars' moon Phobos has a mass of 1.07x1016 kg and a mean radiusof 11.1 km. Let's say our rocket blasts off from the surface of
1. 3 answers
2. 613 views
Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate
1. 2 answers
2. 805 views
I have to do lab experiment where I design a procedure to determine the identity of two unknowns given to me. One will be a
1. 4 answers
2. 1,027 views
I posted before about designing a procedure to determine two unknowns (1 solid, 1 solution). The possible solutions were: NaCl,
1. 3 answers
2. 827 views
Alright, I've made a list of reactions that would produce precipatations.NaCl + Zn CaCl2 + NaOH CaCl2 + Zn CaCl2 + Na2SO4 CuSO4
1. 12 answers
2. 962 views
Stelco has been recently legislated to reduce total SO2 emissions from iron smelting operations. Select the most effective
1. 5 answers
2. 482 views
For each of the pairs of bases below, choose the stronger base:(i) NH2- or NH3 (ii) ClO3- or ClO2- (iii) Cl3CCOO- or Cl2HCCOO-
1. 5 answers
2. 1,168 views
A person falls in water at 0 degrees C. After 20 minutes of exposure, they are suffering acute hypothermia, as their core body
1. 7 answers
2. 1,369 views
When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system
1. 7 answers
2. 749 views
The reaction between 0.055 g of calcium with an excess of water was carried out in an ice calorimeter. The volume of water in
1. 2 answers
2. 567 views
In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL
1. 6 answers
2. 2,852 views
How can I tell whether something is a weak, strong, or non-electrolyte?I know non-electrolytes do not ionize, strong almost
1. 3 answers
2. 858 views
Can someone explain for organic chemistry naming, when something would be given something like "iso" in it or when we would say
1. 5 answers
2. 488 views
I can't figure this one out, the antiderivative of x^-1.I thought it would be c, but the derivative of c is zero.
1. 4 answers
2. 967 views
If I am given a molecular hydrocarbon structure, how would I be able to tell how sp3 hybridized carbons it possesses?Like my
1. 1 answer
2. 462 views
Write the structure for the alkane:molecular mass = 72 u; forms four monochlorination products. Well since its 72u and its an
1. 2 answers
2. 506 views
Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?
1. 1 answer
2. 387 views
For a lab, I had to react toulene with 1% I2 in dichloromethane. Would HI form as a result of this?Logically, I think there
1. 3 answers
2. 367 views
If I2 reacted with hexane, how would we know, which carbons the Is go on? Would only one of the iodine go to the hexane and the
1. 1 answer
2. 426 views
In the reaction PCl3 + Cl2 ---> PCl5.If the rate doesn't increase when the concentration of PCl3 is doubled and the rate
1. 4 answers
2. 779 views

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