chemistry! URGENT

59,905 results, page 8


URGENT!!!!! 4 questions total! 1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how ...

Very urgent please...

What is the real birthdate of Kalpana chawla ,the first indian,asian woman astronaut who died over texas skies on february 1 st 2003?

11th grade

I NEED URGENT HELP!! Bob is riding his bike along at 2m/s and drops his 2kg backpack from a height of 1.5 meters. What is the backpacks resulting velocity when it strikes the ground?


Can you check this sentence, it's really urgent. Before sending you details of my credit card, I would like you to confirm the offer made to me by Mr Smith, your Reservation Executive.

history (urgent)

Identify and discuss 4 key actions taken by the U.S. Government between 1790 to 1820 that established long term policy in the U.S. Please help me answer this, thank you so much.

ALGEBRA 2 urgent!!

if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.

Urgent math

Please help me solve this problem?!?! Find the first six terms and the sixth partial sum of the sequence whose nth term is an = 5n2 − n. a1 = a2 = a3 = a4 = a5 = a6 = S6 =

Maths Lit, Geography, Consumer Studies, Tourism

I was doing these subject at school so I was wondering which courses I should take in university and what are the available carreer options. Please help, it's urgent

Maths Urgent please

Use differentiation to find the taylor series about 0 for the function g(x)=(1/16+x)^-5/4 giving all terms up to one in x^2, and calculating each coefficient as an integer or a fraction

urgent mc biology

Which of the following do you have less of at the end of cellular respiration than at the beginning? (a)Co-enzyme A (b)ATP synthase (c)ADP (d)the proteins of the electron transport chain (e)FADH2

12 Biology! URGENT!

Can anyone please explain how LH affects estrogen and progesterone? I tried searching the internet and I don't understand, so can someone EXPLAIN it to me in words? THANKS!! THANKS!

help needed ....urgent

Around the time of the Roman Empire the terms inch, foot and yard were refined. What was the length of a foot based on?


Determine an equation of the following line. The line parallel to x+3=0 and passing through (-6, -7) How would I solve this if there's no y variable? Please help, thanks.


How to graph this: Step 0: y=x(x-4) Step 1: y=x^2-4x What's next? Calculator shows vertex at (2,-4) I asked before, but I'm still stuck. Please help. thanks.


URGENT PLEASE HELP please help me understand how to draw a net, am i supposed to memorize these or is there a method for drawing nets for different shapes.

Urgent math

If f(x, y, z)=sin(3x-yz), where x=e^(t-1), y=t^3, z=t-2, what's df/dt(1)? x(1)=1 y(1)=1 z(1)=-1 df/dt=(3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2)+(cos(3x-y))(1) I seriously need help on this and tell me the answer and show your work through steps. Thanks.


URGENT Please remove thread as previously requested asap. Thank you. Writing Sam, Monday, October 21, 2013 at 5:46pm


The ratio of three consecutive angles in a cyclic quadrilateral is 2:3:4. Find the largest angle of the quadrilateral, in degrees.

linear algebra urgent

Use the Gram-Schmidt process to transform the basis 1 1 1 , 0 1 1 , 2 4 3 for the Euclidean space R3 into an orthonormal basis for R3.


you put 5,000 in an account that is compounded quarterly. the annual interest rate ,r, is 4%. how much will be in the account after 10 years?

Math Question

A bread recipe calls for 1/3 cup of butter. You want to make 1/2 of a batch. How much butter do you need? A 1/6 B)2/3 C)1/3 d) 1 1/2 Please help Its urgent!! Thanks!

Chemistry - please this is urgent

To a calorimeter containing 41.80g of water at 29.95oC, 11.7999 of a salt was added with stirring. As the salt dissolved, the temperature rapidly changed to 37.85oC before slowly returning to room temperature. 1. Calculate the Heat of Solution. Given that the Heat of Formation...

Physics URGENT!!!

two charges attract each other with a force of 2.5 N. What will be the force if the distance between them is reduced to one-ninth its orginal value?


need urgent help with an epigram for a biography about the Wright Brothers- an epigram is like a quote or saying that is at the start of a piece of text.

Biology (urgent)

Sexual reproduction in trees. How does pollen transport in trees differ from flowers. Please help me!!! I can't find an answer for this. thank you very much.


Expand and simplify. 12-2(3y-2)(3y+2)-(2y+5)(2y+5) Textbook Answer: -22y^2-20y-5 I don't know how to get that. Can someone show me the step by step process? thank you very much.


find an equation of the linear function f using the given information. please show all steps and work f(-1)=1, f(1)= -2

stats - URGENT!!!!

the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

stats - URGENT!!!!

the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

stats - URGENT!!!!

the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

stats - URGENT!!!!

the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20


There are 5 boys and 4 girls in my class. In how many ways can they be seated in a row of 9 chairs such that at least 3 girls are all next to each other?

pre-alg URGENT

triangle ABC has coordinates. A(1,4); B(3,2); and C(4,2). Find the coordinates of the image A'B'C after a reflection over the X axis. (Show your work)


factor 9-6x-3x^2 The expression x^2-8x+k cannot be factored if k has the value A.)7 B.)0 C)-7 D)-9 Please show me how to do these questions step by step so that I can understand & learn


fatima bought 1200 eggs at rs.16 a dozen. At what price per hundred must she sell the eggs so as to earn a profit of 15%. /////****urgent****////


A newspaper vendor sells newspapers at a commission of 6%. He earns rs 75 per day. what is the cost of newspapers? /////////***vvvv.urgent****//////// ans is rs 1175 how?


I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?

12 Biology! URGENT!

How is photosynthesis affected if photosystem I is not functional? No website, or text book seems to be providing me with a proper explanation; I seem to be missing the concepts of the photosystems :(. Thanks to whomever helps me!


Suppose a+4b+9c+16d+25e=-13, 4a+9b+16c +25d +36e =-8, 9a+16b+25c+36d+49e=3, Find the value of 16a+25b+36c+49d+64e=?

TO DrBob222 or any science helper

identify the following formulas as acids, bases or salts: HCH3COO NaCL H2CO3 C6H8)7 Mg(OH) NaOH KBr Sr(OH)2 HNO3 please help really urgent :) thanks :)

Language Arts urgent!!

A student is writing a paper and needs to make sure she is using the word apprehension correctly. What reference book would help her check its part of speech?

Chemistry URGENT

I am having a hard time understanding how to calculate pH. my textbook states that that pH =-log[H^+]. I have two questions that asks: What is the H^+ concentration in an acid with of pH 4.6? Express your answer as a power of 10. What is the H^+ concentration in a base with a ...

***Latin Urgent***

As I'm studying these prepositions to be used in the ablative case, I had a question. How do you know when to use a (with a macron) verus ab? What about e (with a macron) versus ex? Thanks for your explantion!

Calculators- memory?

For the TI-84 plus edition calculators do the programs you created and notes you put on there get deleted once you change the batteries? this is a very urgent question. thank you.

Algebra 2 URGENT

Lina Chen invested $24,000, part at 8% and the rest at 7.2%. How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment?

Re:Social Studies Urgent

socialist government: who is eligible to vote i've been searching this forever well most of all the socialist question need help on. please help and thank you

physics urgent please

Give an example of projectile motion;include in your explantion the term "velocity" , "accleration" and "displacement", orginality in your example will be appreciated?

computers lies or truth VEY URGENT

I saw a website that said the world will end in 2015. Is this true or not? I'm getting really really scared.


Find the magnitude and direction of the equilibrant of two forces, one being horizontal pull of 18 N and the other a pull of 23 N at 50 degrees to the 12 N force.

quantum physics

the quantum factor algorithm for N=91 is carried out. What is the period k of the periodic superposition set up if it chooses x=8? Guys please help...its very urgent!!


a charges electric potential energy within an electric field is calculated as the product of the ____ of it's position times the magnitude of it's charge


This isn't very urgent but can you please break this down to me step by step? I really don't understand. I get that I'm supposed to use the order of operations but I still get lost. 2[4(9-7)+1]/3

Science URGENT

Marquez is in the ocean on his surfboard. While waiting for the perfect ride, he notices that waves pass him about every 4 s. What is the frequency of the waves? A. 0.75 Hz B. 0.5 Hz C. 0.25 Hz D. 0.2 Hz

Urgent Math

Suppose the area under y = -x^2+1 between x = 0 and x = 1 is rotated around the x-axis. Find the volume by using Disk method and shell method.


By making the substitution u=7^x and using part a, derive a hidden quadratic equation 7^(2x-1) +4×7^(x-1) -1/14 =0 and hence find all of the solutions to the above equation.

Chemisty - urgent

How do I prepare 30% v/v ethanol from 95% ethanol? Thanks.

chemistry(Urgent Please help)

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.945 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 33.9 mL of barium hydroxide to reach the endpoint. A. What is the molarity of the barium hydroxide ...

Physics - urgent, please help

In its final trip upstream to its spawning territory, a slamon jumps to the top of a waterfall 1.9m high. What is the minimum vertical velocity needed by the salmon at the end of this motion?


can someone please give me a direct link to a picture that protrays or is related to the britsh parliament passing the Statute Of Westminister Act to Canada in 1931. thankss .. realli URGENT

History URGENT reflecting

Hi What is a general way to reflect on an cartoon? I have some rough ideas like talking about perspective of the artist and the portrayal but I'm not sure if i'm missing something. Thanks!

chemistry URGENT (1)

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...


f(x)=12x^5+45x^4–80x^3+2 the question asks to find the inflection points but i don't seem to understand how to find this even by taking the second derivative.


Infrared, ultraviolet, and visible radiation are all part of the electromagnetic spectrum. Arrange the three types of radiation in order of increasing energy.


How can ionization potential and electron affinity be used to predict whether or not a simple synthesis reaction will occur between a metal and a non-metal.


On my homework there's a diagram of a flying bird with the allele of aa and then there's an arrow pointing to the land with 3 birds on the ground with the alleles AA. What would the allele frequency of A change from? A)1 to .75 B)0 to .25 C)0 to .75 D)1 to .25


A triangle has side lengths 10,17 and 21cm. Find the length of the shortest altitude. And please show working out to help me understand.

urgent pls education

Assuming in your class,you have noticed that a particular child who is an adolescent has suddenly become withdrawn,discuss how you are going to help such a child???

geometry- Urgent!!!!

In various constructions, you need to use the longer of two segments to construct the radius of a circle. Why do you think this is? What happens if you use the shorter segment?

Calculus Help Please Urgent!!!

Use the Midpoint Rule with the given value of n to approximate the integral. Round the answer to four decimal places. integral from o to pi/2 (2cos^3(x))dx , n = 4 M4 = ?????? Thanks!!!


If you were a muckraker, would you want to expose, uncover, or examine the issue? Do you feel that issue still exists today, perhaps in a different form?

chemistry URGENT...30 min left

Gasoline is a mixture of hydrocarbons of various chain lengths, ranging from 5-carbon chains to 10-carbon chains. One of the hydrocarbons we often hear about is the 8-carbon chain, octane. Octane combusts with oxygen as given by the balanced equation: 2C8H18(g) + 25O2(g) &#...


urgent- A 2200kg truck accelerates at 15m/s2(squared). What is the net force on the truck? What is the acceleration of the truck?


Find the number of solutions to the equation 1/a+1/b+1/c+1/d=1 where a, b, c, d are positive integers and a≤ b≤ c≤ d.

solid geometry " urgent help"

if the plane of a circle of center M contained in plane X , MA perpendicular to plane X and if AM = 2√7 cm , BC = 8 cm find the length of AB..

english.. URGENT!!

please post some sentences with the words: postulate edgy regurgitate archetype steed opiate deplete perspective fair quest invincible flitting tenements trajectory


UrGENT, PLS ANSWER MY QUESTION IMMEDIATELY!!! For each pair of commodities,state which do you think is more elastic and give your reasons:perfume and salt; penicillin and icecream; automobiles and automobile tires.

Science ecosystems

Paper Glass Aluminum Wooden ruler Sand Steak Pork chops Salad Bread Hair Cotton fabric Wool Cheddar cheese Can you tell why ? It is urgent !


ok, i need help w/ this problem. (4x^3 + x^2 + 3) + (x^3 + 2x^2 +1) can u please explain how to do this please? i'm very lost. Thanx! -Ally

social studies (urgent)

ok i am researching on chad and i need help finding some stuff what are chad dances what are chad arts please help and thank you

Chemistry - Electroplating - URGENT

"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat." This is what I have so far- 96,485 coulombs are required to plate 1 Cr; 52/6 = 8.67g. To ...


i have to submitt a project on "consumer awareness in india" so can i get some writings or a sample of it and a case regarding an incident of violation of consumer rights. plssssssss its urgent!!!

English (URGENT)

LQuestion I have to answer: What are the author's reasons for writing this book? How do you know his reasons? Give examples from the novel. I don't really understand that, can someone please clarify. Thank you,

Algebra 2 Urgent! please Help!

simplfy (10x^2-6x-x^3)+(9x+x^3+5x^2) please show all work and steps i have been working on this problem for 10 minutes and still cant figure out how to do it.


i need help with this geometry prblem my math book is online on this site: w w w . k e y m a t h . com / D G 3 the class passcode is: 1574-4c524 The chapter is 0 Lesson 0.2 pg. 9 problem number 6 URGENT !!!

Math urgent

Find a degree 6 polynomial with - 8 as a root, no other roots, and in which the coefficient of x^6 is 16. Assume that all (non-constant) factors of the polynomial correspond to real zeroes.

math - very urgent !

Verify that f(x) = x^3 − 2x + 6 satisfies the hypothesis of the Mean-Value Theorem over the interval [-2, 3] and find all values of C that satisfy the conclusion of the theorem.


pls,this is very urgent.can anyone solve this within 10 mins.. 0.000143 over 1940000 equals k*10powern,where 1 greaterthan equals to k greater10 and n are whole number.The value of k and n are......

Math~Reiny Could you help with this question?

List three different ways to write 5^11 as the product of two powers. Explain why all three of your expressions are equal to 5^11. Plz help it's urgent.

Algebra, URGENT!

Two angles are supplementary if the sum of their measures is 180∘. If the measure of one angle is 13x degrees, represent the measure of its supplement as an expression of x.


8. Chromosome pairs contain different versions of genes, which are called __________________. (1 point) is it base? is it dna? is it alleles? help asap!!!??

Science URGENT help please

Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W


what is the average pressure and average thrust on walls of the tank of cubical dimension of each side 4 m filled with water upto the brim. given g = 10 m raised to -2 . Please help this is urgent

Urgent math

Two polynomials P and D are given. Use either synthetic or long division to divide P(x) by D(x), and express the quotient P(x)/D(x) in the form P(x) D(x) = Q(x) + R(x) D(x) . P(x) = 10x3 + x2 − 21x + 9, D(x) = 5x − 7 p(x)/d(x)=

Physics 11 question pls urgent HELP!!!!!

The 1205 kg physics dragster is traveing ay 35km(easy) when it hits the gas and accelerates at 12.5 m/s^2 for 3.25s. What is change in momentum during this time?

Chemistry- urgent!

When a solution of sodium oxalate (Na2C2O4) is added to a solution of lanthanum (III) chloride, lanthanum oxalate (molar mass 541.86 g/mol) The balanced net ionic equation for the reaction is: 3C2O4^2- (aq) + 2La^3+ (aq) --> La2(C2O4)3 (s) Thirty ml of 0.2000 M sodium ...

chemistry URGENT (2)

Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system ("on" or "by")? Note that no "en-on" cases appear here, as these are always thermodynamically unfavourable. There is no need to do ...

Urgent Math

Growing up,you lived in a village. When you left for college, the population was 840. You recently heard that the population has grown by 5%. What is the percent population?


Each carriage of a train has 45 people which includes 3 stewards and 1 guard. The train has 12 carriages. How many passengers are on the train?

Geometry urgent!

If the radius of the two areas is 12in find the length of a chord of an arc of 45 degrees, 30 degrees and 60 degrees. I really don't know what to do here! Please help!!

Math- urgent

The second of two numbers is five more than the twice first. The sum of the numbers is 44. Find the numbers. Show all work.


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