Thursday

August 27, 2015
Total # Posts: 1,171

**Chemistry**

In aqueous solution, hypobromite ion, BrO-, reacts to produce bromate ion, BrO3 -, and bromide ion, Br-, according to the following chemical equation. 3BrO-(ag) → BrO3 -(ag)+2Br-(ag) A plot of 1/[BrO-] vs. time is linear and the slope is equal to 0.056 M-1s-1. If the ...
*February 19, 2011*

**chemistry**

What is the rate law for N2O4+CO yields NO+CO2+NO2?
*February 16, 2011*

**Chemistry**

Ozone, O3, absorbs ultraviolet radiation and dissociates into O2 molecules and O atoms: O3 + hv --> O2 + O A 1.10 L sample of air at 22 degrees Celsius and 748mm Hg contains 0.25ppm of O3. How much energy, in joules, must be absorbed if all the O3 molecules in the sample of...
*February 14, 2011*

**earth science**

describe a possible pathway of carbon through the four spheres of the earth.Identifty what each the fourspheres of the earth contains
*February 13, 2011*

**Math**

Solve by factoring: (2x+9)(x-6)=0
*February 8, 2011*

**Math**

Multiply/divide and simplify: (12x^5-8x^3+4x)/(4x) The answer I got is 3x^4-2x^2+1. Is this correct?
*February 8, 2011*

**Math**

Simplify the expression: (3x^2-8x^3+4x)-(9x^2-x^3+x)+4(6x-7)
*February 8, 2011*

**physics**

would a larger rock dropped into a large pan of water make a larger wave than a smaller rock, and which would travel faster?
*February 2, 2011*

**Chemistry**

If 682000 kJ could be transferred with 100% efficiency to water, what volume of water, in liters, could be heated from 8.6 degrees Celsius to 60.0 degrees Celsius as a result?
*January 31, 2011*

**Statistics -Please help :/**

I need this as well......
*January 28, 2011*

**Statistics -Please help :/**

I'm having a problem with the entire Chi-square thing.. I do have answers to these but I'm not sure how to work them out.. If you could help that would be great! :) 1st part: A,B,C are schools. Is the choice of math programs followed independently by school? Write the ...
*January 28, 2011*

**5th grade math**

my sister say 76764546
*January 27, 2011*

**Chemistry**

What will be the final temperature of the water in an insulated container as the result of passing 6.00g of steam at 100.0 degrees Celsius into 100.0g of water at 24.0 degrees Celsius?
*January 27, 2011*

**...**

I happen to see this looking up my question and no. this was not me.. I'm wondering if "bj" took mine and modified it to make their own.. By the way, thank you for your help! I didn't get to reply because I was asleep..
*January 26, 2011*

**Chemistry**

After removing a crucible (containing CaCO3 obtained as a precipitate) from an oven, what could you do (if you were being extremely careful and had enough time) to prove that the CaCO3 is dry?
*January 26, 2011*

**math**

What is the answer to -12+r=-11
*January 26, 2011*

**Espanol III**

I am writing a composition for class and need someone to peer edit. No one around knows spanish so I am hoping someone here would be willing to look over it :) Thank you! Por primera, tú necesitas cambiar los hábitos. Si tú trabajas mucho para tener una ...
*January 26, 2011*

**Algebra 1**

x+x+1/3(x)=315
*January 26, 2011*

**Algebra 1**

answered.
*January 26, 2011*

**Physics **

A skier is gliding along at 2.62 m/s on horizontal, frictionless snow. He suddenly starts down a 16.9° incline. His speed at the bottom is 18.4 m/s. What is the length of the incline?
*January 25, 2011*

**Biology**

In each set up the dialysis tubing contains a solution of 30% glucose and safranin. However, the set ups differ in the contents of the beaker. The control set up has the same solution in the beaker while in the experimental set up it contains just water. In both the level of ...
*January 24, 2011*

**Math**

how do you convert 0.625 into a fraction
*January 24, 2011*

**Chemistry**

How do you make Tris into the acid form?
*January 24, 2011*

**Chemistry**

D is clearly the correct answer. In a sense, activation energy is related to temperature and at higher temps, molecules move faster and therefore have more frequent collisions. Catalysts lower the activation energy by bringing substrates together.
*January 24, 2011*

**algebra 2**

Farmer Brown wants to double the size of his rectangular backyard vegetable patch by adding a strip (of the same width) all the way around it. If its current patch is 12 feet by 18 feet, how wide does the strip need to be? how do you solve it step by step ?
*January 18, 2011*

**Mathematics**

no 11 1/8 she needs to reduce
*January 12, 2011*

**Trigonometry**

46
*January 12, 2011*

**math**

48 duh
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

all wrong
*January 12, 2011*

**math**

how do i write twenty-three hundredths as a number
*January 11, 2011*

**math**

Your answer will be zero. When you have a negative number like that in the beginning, you can make the problem much simpler by changing it. To change the problem, circle each number with the sign directly in front of it. So in this problem, circle the "-2" and the &...
*January 5, 2011*

**History**

What is predestination and how did it affect New England settlements? How did religion play a crucial role in the lives of New England women?
*January 4, 2011*

**Chemistry**

i think its 2. am i right ?
*January 3, 2011*

**Chemistry**

what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass=64.5grams/mole)? (1)0.806 (2)1.24 (3)2.48 (4)5.16 i appreciate any help.
*January 3, 2011*

**Chem**

so for zinc it would be 65.3 ?
*January 2, 2011*

**Chem**

what is the gram atomic mass of zinc? is gram atomic mass the same as atomic mass ?
*January 2, 2011*

**trig**

Simplify the expression cotx divided by secx
*December 22, 2010*

**Math**

Many more depending on how you interpret the words of the song: 1 2 + 1 3 + 2 + 1 4 + 3 + 2+ 1 5 + 4 + 3 + 2+ 1 6 + 5 + 4 + 3 + 2+ 1 7 + 6 + 5 + 4 + 3 + 2+ 1 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 11 + 10 + 9 + 8 + 7...
*December 13, 2010*

**Math**

Can't figure out the answer either need the equation explaining the relationship between s & t
*December 9, 2010*

**Chem**

did I do this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
*December 7, 2010*

**Math**

Luke bought some thing at the store. He paid $5.98 for a pizza, $3.75 for a case of soda $2.50 for a box of brownie mix and $1.01 in sales tax. What information is needed to find Lukes correct change?
*December 6, 2010*

**Math**

C. 4/32
*December 6, 2010*

**Math**

Which fraction also belongs in set a? set - 3/24, 5/40, 9/72, 6/48 a. 4/24 b. 2/8 c.4/32 d. 8/40
*December 6, 2010*

**Math**

Jairo ears $256 for 50 hours of work. Write an equation(proportion) to find x his wages for 76 hours of work
*December 6, 2010*

**Chemistry**

is this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
*December 6, 2010*

**English 101**

What does uncanny and marvelous mean?
*December 4, 2010*

**English 101**

What does uncanny and marvelous mean?
*December 4, 2010*

**Chem**

Calculate the percent yield of eugenol obtained considering the fact that clove oil is approximately 16-19 % clove by weight of cloves. isolated eugenol=061g purity of eugenol in clove oil=99.6% (based on clove oil gas chromatograph) Estimate the % yeild for eugenol.
*November 28, 2010*

**physics help**

wo thin rectangular sheets (0.13 m 0.52 m) are identical. In the first sheet the axis of rotation lies along the 0.13 m side, and in the second it lies along the 0.52 m side. The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final ...
*November 27, 2010*

**chemistry**

why sugar dissolve in cooking oil
*November 25, 2010*

**Chemistry**

By titration it is found that 68.9 mL of 0.122 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
*November 22, 2010*

**Chemistry**

The flask shown contains 10.0 mL of HCl and a few drops of phenolphthaein indicator. The buret contains 0.270 M NaOH. What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration of HCl?
*November 22, 2010*

**Chemistry**

Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+ H2SO4(aq)---> BaSO4(s)+ H2O2(aq) How many milliliters of 3.00 M H2SO4(aq) are needed to react completly with 85.1g of BaO2(s)?
*November 22, 2010*

**Chemistry**

3.13g if CuNO3 is dissolved in water to make a 0.270 M solution. What is the volume of the solution?
*November 22, 2010*

**Chemistry**

Calculate the number of moles of solute in 18.33 mL of 0.1115 M K2Cr2O7(aq)
*November 22, 2010*

**chemistry**

How many grams of solute are present in 205 mL of .340 M KBr?
*November 22, 2010*

**Algebra**

Determine if the equation y = 2^x represents exponential growth or decay I thought at first it was growth but now I think it might be decay because there is no "b" in a parentheses so do I assume b is less than 1 so it's decay? Please help
*November 22, 2010*

**phyiscs**

A uniform plank of length 4.5 m and weight 233 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 454 N walk on the overhanging part of the plank before it just begins to tip?
*November 19, 2010*

**chemistry**

CO (g) + Cl2 (g) ↔ COCl2 (g In one experiment, 0.93 bar of CO was combined with 1.01 bars of Cl¬2 in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was 1.24 bars. Calculate Kp0 for the system.
*November 17, 2010*

**physics help**

A 1.0 kg object is suspended from a vertical spring whose spring constant is 130 N/m. (a) Find the amount by which the spring is stretched from its unstrained length.
*November 15, 2010*

**science**

Are all materials in 3d why or why not?
*November 15, 2010*

**materials**

are all materials in 3d?
*November 15, 2010*

**physics help**

A 8.6 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 186 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.
*November 15, 2010*

**Chem**

Can you please tell me if these are right? Classify the solutes in the following equations as a weak electrolyte, a strong electrolyte of a non electrolyte in water. a. XY2(s)=X2+(aq) +2Y-(aq) b. HX(g) ß=H+(aq) + X-(aq) c. XYZ(s)=XYZ(aq) d. YOH(s)=Y+(aq) + OH-(aq) a. ...
*November 14, 2010*

**integrals!!**

Compute the value of the integral using geometry. integral from -4 to 1 of (2x +8)dx
*November 8, 2010*

**calculus**

Referring to the Mean Value Theorem and Rolle's Theorem, how can I tell if f is continuous on the interval [a,b] and differentiable on (a,b).
*November 7, 2010*

**Chem**

Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100 / 15.78 = 20.7 b. %(...
*November 7, 2010*

**CHEM**

Will you please tell me if these are right? Write the symbol of the caton or anion that give(s) the following reaction:? 1. Forms a precipite with AgNO3 that does not dissolve in HNO3 2. Forms a gas with HCl 3. Give a bright, yellow-orange flame test 4. Forms a precipitate ...
*November 7, 2010*

**english**

Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your neighborhood. Decide what facilities should be recommended. Write an appropriate resolution to be presented to your county government. Remember to give the ...
*November 4, 2010*

**Physics**

Initially sliding with a speed of 2.3 m/s , a 1.8 kg block collides with a spring and compresses it 0.36 m before coming to rest. WHat is the force constant of the spring?
*November 3, 2010*

**physics please help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...
*November 2, 2010*

**help me physics**

suppose the cart has mass m = 203 g, and it strikes the clay at speed vo = 5.24 m/s and comes to a dead stop. Assume the track is frictionless, and the clay is crushed inward by 1.83 cm. a)Find the magnitude of the impulse exerted by the clay on the cart. 1 N-m i got this ...
*November 1, 2010*

**physics**

A 4111.0 kg truck is parked on a 14.6° slope. What is the friction force on the truck?
*October 26, 2010*

**physics**

A woman has a mass of 42.9 kg. What is her weight on earth? and what is her weight on the moon, where g=1.17 m/s2
*October 26, 2010*

**Calculus**

When air expands adiabatically (without gaining or losing heat), its pressure and volume are related by the equation where is a constant. Suppose that at a certain instant the volume is cubic centimeters and the pressure is kPa and is decreasing at a rate of kPa/minute. At ...
*October 26, 2010*

**Calculus**

When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV1.4=C where C is a constant. Suppose that at a certain instant the volume is 470 cubic centimeters and the pressure is 89 kPa and is decreasing at a rate ...
*October 26, 2010*

**Physical Science**

an airplane is flying at 600km/h at an altitude of 2.0km. When the sound of the airplane's engines seems to someone on the ground to be coming from directly overhead, how far away is she from being directly below the airplane?
*October 26, 2010*

**Chem**

Would you please tell me if these are right? A sample of helium has a volume of 325 ml and a pressure of 655 mm hg. What will be the pressure if the helium is compressed to 125 ml (t and n are constant) I got 1703 mm of Hg A 75.0 ml sample of oxygen has a pressure of 1.50 atm...
*October 23, 2010*

**Chem**

Please tell me if these are right. How many grams are needed to obtain 1.5 moles of magnesium oxide? I got 60grams is this right? Write a balanced equation for the reaction of the magnesium and the oxygen including their physical states. I got 2Mg=Mg2+O2? Thank You!
*October 23, 2010*

**english**

In the answer area below, write the conjunction in the following sentence. Sentence: Give it to the boy or his mother. This doesn't seem like it should be difficult, but I want to make sure I understand. Is 'or' the conjunction?
*October 22, 2010*

**Chemistry**

Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce aluminum oxide. A.) write ...
*October 19, 2010*

**english**

In the answer area below, write the 2 adverbs in this sentence and explain how each adverb is used. Example: Eventually, she walked proudly. Answer: eventually - eventually tells when she walked ; proudly - proudly tells how she walked Sentence: She walked very slowly into the...
*October 19, 2010*

**english**

List the nouns in the following sentence. Next to each noun - label whether it is concrete or abstract by writing a "C" or an "A." Sentence: In the midst of the excitement, Samuel lost his pencil on the bus. This is what I believe to be correct: excitement-...
*October 19, 2010*

**Physics #2**

A car can decelerate at -3.40 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 14° uphill? Assume the same static friction coefficient.
*October 11, 2010*

**Physics**

Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
*October 11, 2010*

**Physics**

Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
*October 11, 2010*

**algebra**

Two planes are 1,400 miles apart. They fly towards each other, one at 125 mph and the other at 175 mph. How long does it take the planes to pass each other (round to the nearest hundredth)?
*October 9, 2010*

**physics**

A cheetah is hunting. Its prey runs for 3.21 s at a constant velocity of +8.36 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?
*October 8, 2010*

**physicS**

so thatd be H=dSin17.2 40.45m=dsin17.2 d=40.45/sin17.2 d=136.8 it all looks right, but for some reason incorrect, if anyone has a chance, can you check my math for me? i cant understand where i went wrong
*October 8, 2010*

**physicS**

A skier is gliding along at 6.93 m/s on horizontal, frictionless snow. He suddenly starts down a 17.2° incline. His speed at the bottom is 29.7 m/s. What is the length of the incline? i understand that the equation used is gH= change in (v^2)/2 so i plug in 9.8H=(29.7^2-6....
*October 8, 2010*

**college statistics**

In Chapter 5, Exercise 9, we studied the variability of crime rates and police expenditures in the eastern and Midwestern United States. We’ve now been asked to investigate the hypothesis that the number of crimes is related to police expenditures per capita because ...
*October 6, 2010*

**Projectile Motion Physics**

An Arrow directed at a stationary target is shot at an angle of E25N. The arrow hits the intended target at the same height from which it is launched, 3.0s later. Determine the distance from the archer to the target.
*October 6, 2010*

**1st grade**

fine the rule
*September 27, 2010*

**math**

find the decimal notation for 63/3/8
*September 25, 2010*

**physics**

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be? I came up with a take off speed of 27.4 but the system is saying that is ...
*September 22, 2010*

**math**

nvm you dont have to answer this. i was told the wrong problem.
*September 20, 2010*