Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 3,271

**chemistry**

How would you prepare a supersaturated solution of CuSo4 in 100ml of water

**physics**

Your physics teacher drives an ideal frictionless car of mass 1000 kg which coasts along the level road to his home at a constant speed of 48 km/h with the engine turned off. It then coasts 40 m up his sloping driveway and comes to rest at the top without any braking required....

**chemistry**

If 75mL of a hard water sample required 23.00 mL of .200 M EDTA, calculate the total hardness

**chemistry**

MX2(s)<--> M2+(aq)+ 2X-(aq) ksp=[M2+][X-]2 the question asks.. why is [MX2] not used in the expression for the equilibrium? is it because they aren't used in the expressions?

**math**

Assume that the average annual salary for a worker in the United States is $30,500 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $6,250. Find the following: (A) What percentage of Americans earn below $19,000? (B) What p...

**chemistry**

One buffer solution used to calibrate a pH electrode was made by dissolving 2.24g of potassium propanoate, C2H5COOK, in 250cm3 of 0.20 mooll-1 propanoic acid.

**Science**

How can community growth affect local ecosystems?

**Analyzing Data (HELP!!)**

Multiplying Rabbits Suppose that a pair of rabbits produces six offsrping: 3 males and 3 females. Assumes that no offspring die. 1. If each pair of rabbits breeds only once, how many offspring would be produced each year for 5 generations? 2. Construct a graph of your data. Pl...

**physics**

A car accelerates uniformly from rest to a speed of 21.2 km/h in 8.3 s. Find the distance it travels during this time. Answer in units of m

**Physics**

A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

**math**

On our worksheet this is the same question, but ours states the original ratio of red to yellow as 3:4.

**social studies**

word that means the division of land

**science**

Express 2.5 km in m____________, 4.7 m in mm ____________, and 14 cm in μm

**science**

Suppose your room had been 20 meters wide. Express this width in μm

**Chemistry IR Spectroscopy**

It's correct! Thanks

**Chemistry IR Spectroscopy **

Sort the compounds: conjugated or non conjugated. -but-2-enoic acid -butanoic acid -hex-4-en-3-one -hexan-3-one

**Chemistry**

Thanks!

**Chemistry**

Suppose you have a strong peak at 2230 cm–1. What is the wavelength of the radiation that was absorbed?

**math**

Using the distributive property of multiplication over addition, we can factor as in x2 + xy = x1x + y2. Use the distributive property and other multiplication properties to factor each of the following: 47.99 + 47 (x+1)Y +(X+1) x^2y+z^x3

**ma**

Simplify each of the following using properties of exponents. Leave answers as powers a.3^8.3^4 b.5^2.5^4.5^2 c.6^2.2^2.3^2

**Chemistry**

Assume your sample spots are 1 cm above the bottom of the TLC plate. What happens if you put the plate in a developing chamber that has 1.2 cm of developing solvent? A. The solvent will move up the plate by capillary action faster. B. The sample spots will become more concentr...

**Chemistry**

Why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates visualization. D. To acheive a high conc...

**OCHEM DR BOB PLEASE HELP!!!!!!!!!1**

Why is it possible to use melting point to distinguish the different stereochemistry of the products? (Hint: what is the relationship of the different stereoisomers of the product?)

**chemistry**

Why is it possible to use melting point to distinguish the different stereochemistry of the products? (Hint: what is the relationship of the different stereoisomers of the product?)

**Chemistry**

Assume the solubility of benzoic acid in ice-cold water is 1.70 g/L and the solubility of benzoic acid in hot water is 68.0 g/L. Calculate the minimum volume of water (in mL) needed to recrystallize 0.950 g of benzoic acid.

**CHEMistry**

A mixture of two compounds, A and B, was separated by extraction. After the compounds were dried, their masses were found to be: 117 mg of compound A and 91 mg of compound B. Both compounds were recrystallized and weighed again. After recrystallization, the mass of compound A ...

**OCHEM**

A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 245 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment prod...

**chem**

Of 1.00g of A reacts with 1.50g of B, what is the mass of C how do i do this? Law of conservationn of mass, but not sure where to start?

**Literacy**

B Historical data or the source of the quote, is the correct answer. Just took the test, on page 43.

**Chem Two**

When 2.25 g of a nonelectrolyte solute is dissolved in 125 mL of water at 22 °C, the resulting solution exerts an osmotic pressure of 955 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of the solute?

**chemistry**

OH I THINK I MADE A MISTAKE. I GOT 55.7 AS MY ANSWER NOW

**chemistry**

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine the delta H (in units...

**history**

Which country lawyer from Ashtabula, Ohio, argued that criminals are not born, but are made by the unjust condition of human life?

**stastics**

If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.

**Chemistry**

I was just having trouble with getting the [OH-] concentration. I had the answer just didn't know how to get to it. Thank you, it helped.

**Chemistry**

This question was posted: At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration (3.63x10^-4) but I am ...

**math**

Given a dilation with the origin O (0, 0), by observation determine the scale factor "k." DO,K = (6, 12) (3, 6) What is the scale factor K = a0 Is the dilation an expansion or contraction? a1

**Beginner Alegra**

That was sooo much easier than I was making it out to be. Thank you!

**College Algebra**

Algebra! Not Alegra.

**Beginner Alegra**

From a point on a straight road, Nico and Maria are riding bicycles in the same direction. Nico rides at 12mph and Maria rides at 14mph. In how many hours will they be 11 mi apart?

**Physics**

A block of mass 77.0kg is placed at the top of a frictionless plane that is inclined 46 degrees to the horizontal. The height of the plane is 23.0 meters. Find the speed of the block at the bottom of the plane. Please show all your steps, don't just suggest a formula. Than...

**Physics**

Fabulous! Thank you!!!

**Physics**

Question though, the answer in the book says that the answer is 3.9 Newtons...do I need to convert this answer or something?

**Physics**

Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through your steps, don'...

**Physics**

The liquid in the tube has a density of 1.48 g/cm^3 . The atmospheric pressure is 1.013 X 10^5 newtons per square meter. What is the pressure P in the container? Please walk me through your steps, don't just suggest a formula. Thank you very much.

**Physics**

I know it IS really fast lol, but that's what is says! Thank you for your help!

**Physics**

A wheel is rolling ithout slipping at 487 meters per second to the right on a level surface. the diameter of the wheel is 100 centimeters. What is the angular speed of the wheel in revolutions per minute? Please walk me through your steps, don't just suggest a formula. Tha...

**Physics**

Thank you so much!!

**Physics**

A particle moved along the x axis with a constant acceleration of -85.0 meters per second squared. The initial position of the particle was at the origin and its initial velocity was +325 meters per second. Find the position of the particle at T=4.0 seconds. Please walk throug...

**Physics**

Oh my goodness, thank you so much! I was trying to do so much more then I needed too!

**Physics**

A car slowed down at a constant rate from 32meters per second to 3.0 meters per second in 9.0 seconds. What was the distance the car traveled in 9.00 seconds? Please show all steps, thank you very much.

**chemistry**

When you add 100ml of a 0.1M HCl solution to 200 ml of 0.4M NaOH solution what is the pH? can you please show detailed work. o dont understand this

**algebra**

if a wall is 34 feet, how tall must a ladder be to reach the top if at a 75 degree angle

**algebra**

if lisa studies for 9 hours and gets a score of 75. How long would she have to study to get a score of 94

**physics..**

what's the density of a box whose weight is 1648 newtons and whose volume is 2.8 cubic meters? Will it float in a liquid whose density is 600 kilograms per cubic meter?

**physics**

if the pulleys are massless and frictionless and the rope is of negligible mass, and aristotle wanted to raise the 332 newton weight to a height of 6 meters. A-find the magnitude of force F he needed to pull on the rope to move the weight upward with a constant velocity. B-Wha...

**physics**

the supports are on each end and the weight is in the middle

**physics**

A weightless beam rests on two supports. The beam supports a weight of 120 newtons. What are the magnitudes of the forces on each end ( A & B) of the beam?

**physics**

again-set up?

**physics**

A female whose mass is 130 kilograms is standing on a scale in an elevator that has an initial downward velocity of 6 meters per second and is accelerating upward at 7 meters per second. What's the magnitude of the apparent weight indicated by the scale?

**physics**

I'm confused as how you'd set these up..

**physics**

Trenton struggled as he lifted a 27kg mass vertically a distance of 9 meters in 4minutes with a constant velocity. A-how much work did he do? B-What was the average power comsumption in watts?

**physics**

Forces of 1,5,3, and F newtons are applied to a weightless board that rests on a fulcrum. The board doesn't rotate-what's the magnitude of the force F?

**physics**

a 1462 kilogram block was lifeted vertically at a constant velocity a distance of 0.08 x 10(to the 6th power) meters in 5minutes. A-how much work was done? B-what was the average power consumption in watts?

**physics**

not helpful..

**physics**

Three forces are applied to a box wrench. find the total torque about the bolt in newton-meters caused by these forces. Is the torque a positive torque or a negative torque?

**physics**

wonderful, ty

**physics**

The density of an unspecified material is 3.27 g/cm (cubed) . if the mass of a block of this material is 10.9kg, what is the volume of the block in cubic meters? A Wooden block is pulled to the right across a level surface at a constant velocity by a force of 47 Newtons, the c...

**physics**

How do you find the total mass of two objects that weigh 111 newtons and 218 newtons?

**physics**

Awsome thank you. Now I've been trying to figure out how far he traveled but my equation keeps giving me the wrong answer. How would I figure this out?

**physics**

Galois drove 40kilometers due west in 9hours and then drove 62kilometers due north in 5 hours. What was his dispacement? What was his average velocity?

**physics**

great, ty

**physics**

how do you convert 558 kelvins to degrees Celsius?

**physics**

an object moving in the positive x direction went from a velocity of 2.5 km/s to a velocity of 8.0 km/s in 6.2seconds. what was the object's average acceleration?

**Physics**

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?

**physics **

A Block has a mass of 50.0 kilograms. the coefficient of static friction between the block and the level floor on which it rests is 0.428 A horizontal force of 618 newtons is applied to the block to the right, as shown. will the block move?

**physics**

The weight of the block is 84Newtons

**physics**

A block is pulled to the right across a alevel surface at a constant velocity of a horizontal force of 16 newtons. what is the coefficient of kinetic friction between the block and the surface?

**Physics**

An object moving in the positive x direction went from a velocity of 2.5 km/s to a velocity of 8.0 km/s in 6.2 seconds. What's the object's average acceleration?

**SCIENCE (GENETICS)**

if there are two forms of each of the seven traits, how many possible combinations are there?

**physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?

**physics**

after a golf ball is hit it takes off with an initial speed of 23.4 m/s and at an angle of 43.0 with respect to the horizontal the gold field is flat and horizontal. neglecting air resistence how far will the ball fly

**chemistry**

The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero:___ first: ___ second: ___ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0

**Chem**

I need help please! You have been given 40ml of a 0.6M solution of NaCl and 40ml of a 0.1M solution of KCl. You are also given as much diluent as you need. Show all your work and indicate how you would make 40ml of a single solution that contains 0.005M NaCl and 0.025M KCl.

**Math - patterns**

what's the pattern for 2,3,__, 7, 11, 13, 17

**physics**

a book having a mass of 1.3kg lies on a shelf 1.8 m above the floors in a room whose ceiling is 2.5 m high. What is the books gravitational energy relative to the floor?

**chemistry**

A 115 mL sample of a 10.0 M ethylene glycol (C2H6O2) solution is diluted to 1.30 L. What is the freezing point of the final solution? (Assume a density of 1.06 g/mL for the final solution.) What is the boiling point of the final solution? How would I go about setting this up? ...

**math**

Seek power series solution of the given differential equation about the given point x0; find the recurrence relation. (1-x)y'' + y = 0; x0 = 0

**science**

Does adding boiled, deionized water to the titrating flask to wash the wall of the erlenmeyer flask and the buret tip increase, decrease, or have no effect on the Ksp value of the Ca(OH)2?

**Statistics**

Alonzo applied for a job to be an administrative assistant.He had to take a typing test. His words per minute were translated into a z-score. If the z-score was 0, should he be hired? There were 47 applicants, and typing speed is very important.

**Chemistry**

How did you find the concentration of [OH-]

**chemistry**

A dynamic equilibrium, Ag2CO3(s) <=> 2Ag+(ag) , CO3 2- (ag), what affect does the addition af HCl have on the system? Does it cause a shift?

**CHEMISTRY**

No problem! Thanks! :)

**CHEMISTRY**

No problem! Thanks! :)

**CHEMISTRY**

Okay thanks sooooo much! I really really really appreciate your help! It's fine everyone makes mistakes! :)

**CHEMISTRY**

But Kf= 1.86 degrees C/m not 0.186? So shouldn't it be : dT = 1*1.86*14.46 =26.97 ---> -26.97

**CHEMISTRY**

What did you get for part b if you disagree with -26?

**CHEMISTRY**

oohhh so for part d I mixed up molarity and molality my bad...I get it now! So the answer I got in part a is supposed to be used in part d......Thanks! :)

**CHEMISTRY**

what did you get for part b then?

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