Friday

February 12, 2016
Total # Posts: 4,685

**Chemistry**

Indicate the concentration of each ion present in the solution formed by mixing the following. Assume that the volumes are additive: 3.60 g of KCl in 76.5 mL of 0.274 M CaCl2 solution [K+] = [Cl-] =
*March 13, 2013*

**Chemistry**

Calculate the molarity of a solution made by dissolving 16.0 grams of Na2CrO4 in enough water to form exactly 555 mL of solution.
*March 13, 2013*

**Physics **

A man is standing on a cliff and throws a ball outward 50m/s at an angle of 53 degrees. It hits the base of the cliff in 10 seconds. Find: a) The height of the cliff b) the angle at which the ball goes into the sea c) if the ball will hit a boat 150m out to sea.
*March 12, 2013*

**Physics **

A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?
*March 12, 2013*

**math**

thank you. 15.25 x 190
*March 11, 2013*

**math**

JOHN is planting a garden. He wants to put a fence around it. If the garden is 3,000cm wide and 6,500 cm long, how much fence does he need? What will the cost be if fence is 15.25 per meter
*March 11, 2013*

**social studies**

Aren't you guys cheating if your from connections? Unless this was for the study guide of course. either way you guys shouldn't cheat it's gonna turn out bad for you if you are.
*March 11, 2013*

**history**

D. Terence Powderly
*March 11, 2013*

**science help?**

no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
*March 9, 2013*

**help ??????????????????**

no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
*March 9, 2013*

**science help?**

a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?................ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?................ms^-1
*March 9, 2013*

**grammar**

thank you
*March 8, 2013*

**grammar**

object of preposition?
*March 8, 2013*

**grammar**

preposition?
*March 8, 2013*

**grammar**

For whom should we ask? IS whom subject ,object of preposition or dir ect object?
*March 8, 2013*

**grammar**

thank you
*March 8, 2013*

**grammar**

Everyone to whom she spoke smiled. Is whom the subject,object of preposition or direct object?
*March 8, 2013*

**Physics**

A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0)Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground: (a) what is the moment of inertia of...
*March 7, 2013*

**physics**

A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0) Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground, (a) what is the moment of inertia ...
*March 7, 2013*

**math**

thank you I UNDERSTAND IT NOW
*March 7, 2013*

**math**

ed needs to purchase 5.6 meters of tape. if each roll contains 80 cm and costs 5.00 what is the total cost of the tape ed must buy
*March 7, 2013*

**english**

in which sentence does the objective complement function as an adjective? a-while gardeners love rain, picnickers consider it a nuisance. b-skiers called the record snowfall incredible! c-the hurricane forecasters named the next storm Bob.
*March 7, 2013*

**math**

The scale factor of 2 similar polygons is 3:4. If the perimeter of the large polygon is 200, what is the perimeter of the small polygon?
*March 6, 2013*

**math**

9kids
*March 6, 2013*

**Math**

Understood thanks!
*March 5, 2013*

**Math**

How did you come up with that #?
*March 5, 2013*

**Math**

Yes how many dances
*March 5, 2013*

**Math**

There are 6 dancers in a program. Each dancer will preform a short dance with each of the other dancers before the program is over. How many dancers will there be
*March 5, 2013*

**Math**

There are 6 dancers in a program. Each dancer will preform a short dance with each of the other dancers before the program is over. How many dancers will there be
*March 5, 2013*

**Math**

If you have 2 3/4 ft purple ribbon and 2 1/2 ft of orange ribbon how many bows can be made? 1 bow uses 3/8 purple ribbon and 1/3ft of orange Ribbon. Divide amount have and amount needed
*March 5, 2013*

**Reading**

Not sure which answers to use.. please help: choose from these words: deficit, dissent,lucrative and agnostic.. 1& 2: My uncle decided to splurge and _____ with a country club because golf is his favorite_________.(Dissent & lucrative) 3 & 4 : Because my father_______s to make...
*March 5, 2013*

**Analytical Chemistry**

How many milliliters of 0.0560 M EDTA are required to react with 50.0 mL of 0.0170 M Cu^2+? With 50 mL of 0.0170 M Sc^3+? My work so far: (50mL)(0.0170mmol/mL)= 0.85 mmol Cu^2+ I'm not sure how to do the rest. Please help.
*March 4, 2013*

**math**

X=36"^2 X X=36"X X/X=(36"X)/X X/X=36" 1=36" no solution
*March 3, 2013*

**Math**

Volume cube = a^3 Surface Area cube = 6 a^2 cubed root of 12sqin= cubed root of a 2.28942848511sqin=a (6)2.28942848511sqin^2=31.4488962095 31.4488962095 x .5 cents=15.7244481048
*March 3, 2013*

**algebra**

A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed, the acceleration is 0...
*March 3, 2013*

**algebra**

A truck traveling at 16 m/s is 24 meters behind the bus at t = 0. The equation d = -24 + 16t gives the position of the truck. At what time will the truck be the same distance from the intersection as the bus? What will that distance be?
*March 3, 2013*

**GEN CHEM**

hllo
*March 3, 2013*

**algebra**

let t = 0 be the point at which the car is just starting to drive and the bus is even with the car. Find the other time when the vehicles will be the same distance from the intersection.
*March 3, 2013*

**algebra**

let t = 0 be the point at which the car is just starting to drive and the bus is even with the car. Find the other time when the vehicles will be the same distance from the intersection.
*March 3, 2013*

**algebra**

Set the equations equal to each other so you can determine when the car and bus are the same distance from the intersection. Collect all the terms on the left side of this new equation., leaving 0 on the right side. Factor the expression on the left side of the equation.
*March 3, 2013*

**algebra**

A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed, the acceleration is 0...
*March 3, 2013*

**algebra**

A car is stopped at a traffic light. The light changes to green and the driver starts to drive, accelerating at a rate of 4 m/s^2. Write an equation for the distance the car travels in time.
*March 3, 2013*

**geometry**

167.08 square inches. I need to know the radius of a circle for that number of square inches..
*March 3, 2013*

**HELP PLEASE!!!!!!!**

You go to a online school. This is a discussion for Social Studies. This question is the topic. Study the textbook.
*March 1, 2013*

**Analytical Chemistry**

A 22.617 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.407 g of water. A 10.883 g aliquot of this solution is then titrated with 0.1072 M HCl. It required 29.32 mL of the HCl solution to reach the methyl red ...
*February 28, 2013*

**social studies**

Stop being a dik on Jiskha
*February 28, 2013*

**physics**

when 1 g of gasoline is burned in an engine about 48 kj of heat is produced. how much mass is lost in the process? do you think this mass change could directly be measured?
*February 28, 2013*

**physics**

when 1 g of gasoline is burned in an engine about 48 kj of heat is produced. how much mass is lost in the process? do you think this mass change could directly be measured?
*February 28, 2013*

**physics**

is the work needed to bring a car's speed from 0 to 10 km/h less than, equal to ,or more than the work needed to bring its speed from 10 to 20 km/h? if the amounts of work are different ,what is the ratio between them?
*February 28, 2013*

**Analytical Chemistry**

its alright. I figured out the answer. thanks for your help! :)
*February 27, 2013*

**Analytical Chemistry**

I did not get the right answer by this method.
*February 27, 2013*

**Analytical Chemistry**

I apologize that the ice chart got smushed like this when i posted the problem.
*February 27, 2013*

**Analytical Chemistry**

Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0× 10–4. Methylamine is a weak base and reacts with HCl to give the methylammonium ion. HCl + CH3NH2 <---> CH3NH3^+ + Cl^- ...
*February 27, 2013*

**math**

why does lxw=a work
*February 26, 2013*

**Math**

a group of 100 students took a quiz. Their average score was 76 points. If the average score for boys was 80 points and the average score for girls was 70 points, how many girls participated in the quiz
*February 26, 2013*

**Analytical Chemistry**

Show the predominant form of the amino acid tyrosine at pH=13.9 and ph=7.8. Be sure to include the proper number of hydrogens on heteroatoms and the correct formal charges on atoms. I calculated the pka values for COOH (pka=2.41) NH3 (pka=8.67), and OH (pka=11.01) but i'm...
*February 26, 2013*

**Analytical Chemistry**

You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.086 M NaOH. Next, you add 1.00 mL of 8.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form...
*February 26, 2013*

**Analytical Chemistry**

I got the answer, thanks!
*February 26, 2013*

**Analytical Chemistry**

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.05? Not sure how to find k1 and k2 needed for the fraction formulas...please help :(
*February 26, 2013*

**Literature**

Repeated words, papragrapgh transition, conjunction sentences etc. Just want to make sure on my writing. I am in seventh grade. I don't want to copy and paste it on here in case other kids might use my writing. Other wise I would ask you to look at it. I wish.
*February 26, 2013*

**Literature**

Hi where can I find a free on line thing to check my writing ?
*February 26, 2013*

**physics**

Two spherical shells have a common center. A -2.00 × 10-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +5.50 × 10-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m.
*February 25, 2013*

**Math**

Find the equation of the secant line to the graph of y= 2x^3-3x^2+4x-1 from x=1 to x=3. Give your answer in slope-intercept form.
*February 23, 2013*

**Analytical Chemistry**

Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
*February 22, 2013*

**Analytical Chemistry**

Yes I have online homework which I use to submit my homework on. I calculated H2CO3 and got the same value as yours. then I solved for x and got 2.3 x 10^-6 M. Finally i plugged it into the ph formula to get a ph of 5.64. Thank you so much! It was correct!
*February 22, 2013*

**Analytical Chemistry**

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) <----> CO2(aq) The acid dissociation constants listed in most standard reference texts for carbonic acid actually apply to ...
*February 22, 2013*

**History**

I need help on how people influenced us. I am doing some history homework about the great depression (late 1920's through early 1940's) and I need some future connections like how did Duke Ellington influence us today? Or Walt Disney influence us today...ect. I can'...
*February 20, 2013*

**life orientation**

What according to the basic conditions of employment act applies wwith regard to contraventions
*February 20, 2013*

**biology helppppppppppppppp**

(This homework question has been removed due to a copyright claim submitted by The Open University.)
*February 20, 2013*

**English**

well i am trying thanks anyway!
*February 16, 2013*

**English**

incentive,incorporate
*February 16, 2013*

**English**

AS Leo explained a failed business deal that had once_____e(d) him,he______(e)d into the even more interesting tale of his romance with Molly, his business partner. My answers:rigor, curtail Is this correct?
*February 16, 2013*

**english**

which word would be the best word to use in this sentence... My aunt has only______success in quitting smoking.Every few monthsshe ____sto temptation,and then she has toquit all over again. succomb and curtail..Is this correct?
*February 16, 2013*

**English**

Thanks for your help!
*February 16, 2013*

**English**

1.squander 2.digress 3.rigor 4.incentive 5.devastate 6.succumb 7.indispensable 8.incorporate 9.curtail 10.intermittent
*February 16, 2013*

**biology help?**

In 1857, Louis Pasteur discovered that yeast is a living organism. The activity of yeast causes fermentation – baker’s yeast, Saccharomyces cerevisiae, has been used for centuries in the production of bread, beer and wine. In the absence of oxygen, yeast is able to ...
*February 15, 2013*

**Math on graphs**

If 30 3rd graders owned birds, how many third graders were surveyed? Reptiles 5% Birds 5% Fish 10% Cats 35% Dogs 45% I did 5% of 30 = .05 x 30 = 1.5 30/1.5 = 20 third graders BUT I am thinking I am doing something wrong? Where did I go wrong? Should it be 30/.05 = 600 students...
*February 14, 2013*

**Math help ??**

Oops I meant 30 third graders.
*February 14, 2013*

**Math help**

If 20 3rd graders owned birds, how many third graders were surveyed? Reptiles 5% Birds 5% Fish 10% Cats 35% Dogs 45% I did 5% of 30 = .05 x 30 = 1.5 30/1.5 = 20 third graders BUT I am thinking I am doing something wrong? Where did I go wrong? Should it be 30/.05 = 600 ...
*February 14, 2013*

**Math**

how to solve polynomiels?
*February 11, 2013*

**Pre Algebra**

I have to design new dice for a board game. I have to use two standard cubes each with six faces and number then in such a way the the probability of rolling the numbers 1-12 are the same
*February 11, 2013*

**Math**

Write a number sentence. Marshall sleeps 8 hours each day. How many hours does Marshall sleep in one week? How many hours is Marshall awake each day
*February 11, 2013*

**physics**

A crane is used to hoist a 500kg crate vertically at a constant velocity of 4 meters per second. Ignore the effects of friction. a) calculate the magnitude of the net force experienced by the crate b) calculate the magnitude of the force applied by the cable on the crate
*February 11, 2013*

**math**

how many square feet are there in an area of 1.00 square meters(1ft=0.305m)?
*February 10, 2013*

**geometry**

Got it! A) Write a variable expression for the area of the picture. x² <==ANSWER B) Write a variable expression for the total area of the poster. (x + 15)(x + 6) <==ANSWER C) Use your solutions to parts A & B to write a variable expression for the area of the border...
*February 8, 2013*

**geometry**

a poster art exhibition is to display a square picture with a white border around it. The border must be 10 in. wide at the bottom, 5 in. wide at the top, and 3 in. wide on each side. Using x to represent the length of a side of the picture. A) Write a variable expression for ...
*February 8, 2013*

**Solving linear equations**

You need to look at the differences between each number. At some point a pattern will repeat, and you follow the differences to determine the next number in a sequence. Do you have an example you can post? Example: 2,5,6,8,11,12 The difference between 2 & 5 is 3 The difference...
*February 8, 2013*

**math**

how many square feet are there in an area of 1.00 square meters(1 ft=0.305)
*February 8, 2013*

**Chemistry**

At a certain temperature, the solubility of gas in water at 2.04 is 48.0 . Calculate the solubility of gas in water, at the same temperature, if the partial pressure of gas over the solution is increased from 2.04 to 6.00 .
*February 8, 2013*

**physics**

From a height of 2.15 m above the floor of Boston's Fleet Center, forward Paul Pierce tosses a shot straight up next to the basketball hoop with a KE of 5.40 J. If his regulation-size. basketball has a mass of 0.600 kg, will his shot go as high as the 3.04 m hoop? Use the ...
*February 7, 2013*

**world history **

The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
*February 7, 2013*

**U.S History **

The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
*February 7, 2013*

**Math**

How to divide4/5 divide 7/8
*February 5, 2013*

**Algebra 1 I need help!!!!!!!!!!!!!!!!**

8.A number raised to a negative exponent is negative. Is it always , never, or sometimes. 7. Evaluate 1/2a^-4b^2 a = -2 and b = 4 remember a^to the negative 4 6. Simplify. Write in scientific notation. (9 x 10^-3)^2 Thanks to anyone who helps right away and need right answer ...
*February 4, 2013*

**Physics**

A particle is traveling in a straight line at a constant speed of 28.5 m/s. Suddenly, a constant force of 12.0 N acts on it, bringing it to a stop in a distance of 61.9 m. (a)Determine the time it takes for the particle to come to a stop. s (b) What is its mass? kg
*February 4, 2013*

**math**

The graph of a function is horizontally compressed by a factor of 5 and vertically compressed by a factor of 2 Find an equation for this compressed function in terms of the function f(x)
*February 4, 2013*

**Calculator Question**

how do I input ln7/ln2/5600 correctly in my calculator to get 2900 as my answer?
*February 4, 2013*

**Chemistry**

What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are involved.
*February 4, 2013*

**Chemistry**

Thank you! That was the correct answer. Plus I finally figured out why that was the correct answer :)
*February 4, 2013*

**Chemistry**

Complete the charge balance equation for an aqueous solution of H2CO3 that ionizes to HCO3^- and CO3^2- ______ = ______ + _______ + _______ Given choices: [HCO3^-],[CO3^2-], [OH^-], 2[H^+], [H2CO3], 2[CO3^2-], 3[H^+], {H^+] I don't understand how to do charge balance :(
*February 4, 2013*