Friday

February 12, 2016
Total # Posts: 790

**chemistry**

the equilibrium constant for the synthesis of HBr(g0 from hydrogen and bromine gas is 2.18*10 exponent 6 at 730 degrees celcius.if 3.75 mol of HBr(g) is put into a 15L reaction vessel,calculate the concentration of H2,Br2 and HBr at equilibrium
*April 2, 2013*

**acc. 205**

partner investments, journal entries. The LP partnership was formed on January 1,19X7, by investments from bill levy and marv parcells. levy contributed $30,000 cash and 80,000 of land. Parcells contributed cash of $50,000 and equipment with a value of $20,000. prepare the ...
*March 29, 2013*

**math**

what is the value of 3^0+3^-2
*March 7, 2013*

**STAT**

Calculate SP (the sum of products of deviations) for the following scores. Note: Both means are decimal values, so the computational formula works well. X Y 0 2 0 1 1 0 2 1 1 2 0 3 Assume a two-tailed test with .05. (Note: The table does not list all the possible df...
*March 3, 2013*

**STAT**

An independent-measures research study compares three treatment conditions with a sample of n = 10 in each condition. The sample means are M1 = 2, M2 = 3, and M3 = 7 a. Compute SS for the set of 3 treatment means. (Use the three means as a set of n = 3 scores and compute SS.) ...
*February 24, 2013*

**Elmentary Math for Teachers II**

A spinner containing 8 numbers is spun. What is the probability of the event that the spinner A.) lands on an odd number? B.)lands on a number divisible by 3? C.)does not land on 5,6, or 7? D.)lands on a number less than 4?
*February 8, 2013*

**Elmentary Math for Teachers II**

From a set of eight marbles, five red and three white, we choose one at random. What are the odds in favor of choosing a red marble?
*February 8, 2013*

**Elmentary Math for Teachers II**

From a set of eight marbles, five red and three white, we choose one at random. What are the odds in favor of choosing a red marble?
*February 8, 2013*

**Elmentary Math for Teachers II**

In a class of seven students, a teacher spins a seven-sectored spinner (with equal-sized sectors) to determine which students to ask questions. Determine about how many times a student can expect to be called on when 100 questions are asked.
*February 8, 2013*

**stat**

Explain why using the t statistic may be an appropriate alternative to using a z-score
*February 5, 2013*

**Math **

I need help with this these two problem PLEASE!!! For a population with a mean of μ 80 and a standard deviation of 12, find the z-score corresponding to each of the following samples. a. M 83 for a sample of n 4 scores b. M 83 for a sample of...
*February 1, 2013*

**Math **

If the population standard deviation is 8, how large a sample is necessary to have a standard error that is: a. less than 4 points? b. less than 2 points? c. less than 1 point?
*February 1, 2013*

**4th grade math**

it fun
*January 30, 2013*

**chemistry 101**

pls can anybody check my answers
*December 8, 2012*

**chemistry 101**

If 15g of NaOh is dissolved in 285 g of water, calculate the following. Assume the density of the solution is 1.06 g/cc. a) Calculate the moles of NaOH in the solution? My answer is 15gNaOH/40g NaOH= .0375 mole NaOH b) Waht is the mass % w/w of the solution? My answer is 15g ...
*December 8, 2012*

**Math Help**

It takes Andy and Ben the same amount of time to eat 1 large piece of chocolate. It takes Charlotte 3 more mins than Andy and Ben to eat the same piece of chocolate. One day, Andy, Charlotte and Ben share 2 pieces of chocolate among them. It takes them 5 mins to eat 2 pieces ...
*December 2, 2012*

**Basic college Math**

9/2
*December 2, 2012*

**Math**

It takes Andy and Ben the same amount of time to eat 1 large piece of chocolate. It takes Charlotte 3 more mins than Andy and Ben to eat the same piece of chocolate. One day, Andy, Charlotte and Ben share 2 pieces of chocolate among them. It takes them 5 mins to eat 2 pieces ...
*December 2, 2012*

**chem **

1.Can a solution ever have a pH=0? 2.What does pH = 0 suggest about the concentration of the acid? 3.Can the pH ever be negative? 4.What is the significance of a negative pH in a solution? pls need help we didn't cover this in lecture yet.
*November 28, 2012*

**chem **

what would happen to the aacuracy and precision of measurements if the mass is measured to a tenth of a gram instead of a thousandth of a gram?
*November 26, 2012*

**chem**

thanks for the explanation pls is it endothermic or exothermic reaction i'm confused with this
*November 26, 2012*

**chem**

Zn^2+(aq) + 2OH^-(aq) ----> Zn(OH)2(s) a) how the addition of HCl affects the equilibrium? my answer is it will shift to the right b) how the addition of a small amount of NaOh affects the equilibrium?my answer is it will shift to the left c) how the addition of a large ...
*November 26, 2012*

**statistics.. URGENT!! PLZ!!**

The margin of error is: a. the difference between the point estimate and the true value of the population parameter b. the critical value times the standard error of the estimator c. the smallest possible sampling error d. none of the above Complete the following sentences ...
*November 24, 2012*

**chem**

How many grams of KBR, could be recovered by evaporating 650 g of a 15.0% KBr solution of dryness?
*November 21, 2012*

**chem**

When the concentration of I2 is increased to 1.5 M, the ratio of products to reactants is 28. The equilibrium constant for the reaction is 83. In which direction will the reaction shift to regain equilibrium?
*November 19, 2012*

**chem**

The molar concentrations for the reactants and products at equilibrium are found to be [HCl] = 0.80 M, [O2] = 0.20 M, [Cl2] = 3.0 M, and H2O = 3.0 M. What is the value of the equilibrium constant for this reaction? the complete reaction is 4HCl+O2=2Cl2+2H2O i got this answer ...
*November 19, 2012*

**chem**

a.) At equilibrium, the molar concentrations for reactants and products are found to be [I2] = 0.50 M,[Cl2] = 0.60 M, and [ICl] = 5.0 M. What is the equilibrium constant (Kc) for this reaction? b.) The concentration of I2 is increased to 1.5 M, disrupting equilibrium. ...
*November 19, 2012*

**chem**

An 80 proof brandy is 40.0% (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage.How many milliliters of alcohol are present in 700mL of brandy?
*November 8, 2012*

**chem**

thanks DrBob222 i already figure out how to do it
*November 8, 2012*

**chem**

Calculate the final concentration of a. 4.0 L of a 4.0 M HNO3 solution is added to water so that the final volume is 8.0L b. Water is added to 0.35L of a 6.0M KOH solution to make 2.0L of a diluted KOH solution. c.A 20.0 mL sample of 8.0% (m/v)NaOH is diluted with water so ...
*November 8, 2012*

**algebra **

The price of a small cabin is $85000 the bank requires a 5% down payment the buyer is offered two mortgage options: 20 year fixed at 9.5% or 30 year fixed at 9.5% calculate the amount of interest paid for each option how much does the buyer save in interest with the 20 year ...
*November 7, 2012*

**chemistry**

Suppose you have 0.500 M sucrose stock solution. How do you prepare 250 mL of 0.348 M sucrose solution ?
*November 7, 2012*

**math**

Question: The price of a home is $180,000. The bank requires a 10% down payment. After the down payment, the balance is financed with a 30 year fixed mortgage at 6.3%. Determine the unpaid balance after ten years. Answer: The unpaid balance after ten years is $136,641.85 I ...
*November 5, 2012*

**chemistry**

a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
*November 3, 2012*

**chem**

a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
*November 3, 2012*

**CHEM**

what volume would 10.5g of nitrogen gas, N2, occupy at 200.K and 2.02atm?
*November 2, 2012*

**chem**

in a. I got 60 L for volume and .8 moles(.2+.6moles. now in b. i got .16 mole so where do I subtract .16 from should I subtract it from .8 moles or from the initial mole which is .2 mole
*November 1, 2012*

**chem**

A sample containing 6.40 g O2 gas has a volume of 15.0 L. Pressure and temperature remain constant. a. What is the new volume if 0.600 mole O2 gas is added? b. Oxygen is released until the volume is 12.0L. How many moles of O2 are removed? c. What is the volume after 7.50 g He...
*November 1, 2012*

**chem**

How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls
*October 30, 2012*

**chem **

How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls.
*October 30, 2012*

**chem**

if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
*October 19, 2012*

**math**

A group medical practice has 40,000 patients. Charts vary in thickness from 1/4 to 1 inch thick. The average of all charts is 1/2 inch thick. Using the average 1/2 inch thickness, how many inches of shelf space will be required for 40,000 charts?
*October 16, 2012*

**chemistry**

if the mass of a metal is 127.70 grams, what is number of moles on the metal in the cube?
*October 16, 2012*

**chemistry**

How many water molecules are in the recommended volume of water (1.50L) that should be consume daily?
*October 10, 2012*

**chemistry**

what volume of water should be weighted out to represent one mole of water molecules at 20 degree C
*October 10, 2012*

**chemistry**

could donuts be quantified in terms of mass instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say...
*October 10, 2012*

**chemistry**

could donuts be quantified in terms of instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say you ...
*October 10, 2012*

**chemistry**

invent a term to describe a certain number of something you use that isn't already being used. Define and explain
*October 9, 2012*

**chemistry**

Assuming that the price of god is $11,000.00/Kg, What is the approximate $value of one mole of gold atoms?
*October 9, 2012*

**chemistry**

oh then good thanks a lot
*October 5, 2012*

**chemistry**

When will hydrogen bonding occur?Give an example of liquid other than H2O in which this type of force is important. In order for a hydrogen bond to occur there must be both a hydrogen donor and an acceptor present. The donor in a hydrogen bond is the atom to which the hydrogen...
*October 5, 2012*

**chemistry**

thank you
*October 5, 2012*

**chem**

so wrong post
*October 5, 2012*

**chem**

thanks now I understand way to go
*October 5, 2012*

**chemistry**

thanks a lot i was waiting for your comment
*October 5, 2012*

**chemistry**

Based on their boiling point, CH3CH2OH bpt. 78C, CH3CH2CH2OH bpt. 97C, CH3CH2CH2CH2OH bpt. 118 C how will I be able to rank these three in terms of strength of their IMF.Pls kindly explain it they gave this a a homework and never been discussed in class. thank you
*October 5, 2012*

**chemistry**

Rank C2H6O, C3H8O and C4H^10 O in terms of IMF and explain their structures? neeed heeelppp.thank you
*October 5, 2012*

**physics**

How high will a 1.85 kg rock go if thrown straight up by someone who expends 80.0 J of energy on it?
*September 29, 2012*

**Science**

How do you show a car constant speed Horizontal line or vertical
*September 17, 2012*

**Physics**

A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet's speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
*September 10, 2012*

**Physics**

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
*September 10, 2012*

**Physics**

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
*September 10, 2012*

**Physics**

A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
*September 10, 2012*

**basic statistics**

What is construct a 95 percent confidence interval about the sample mean N= 11?
*August 6, 2012*

**human growth and Development11**

Samuel,a50-year-old psychologist, claims that he is a victim of"revolving door syndrome" What is Samuel's problem?
*July 15, 2012*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*June 29, 2012*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*June 29, 2012*

**algebra**

L= 2+2W perimeter = 2L+2W 28=2L + 2W 28=2(2+2W) + 2W 28=4+4W+2W 28=8W+2W 28=10W 28/10=W W=2.8
*June 20, 2012*

**math**

2(x-3)=(14-x)/5 10(x-3)=14-x 10x-30=14-x 11x-30=14 11x=44 x=4
*June 20, 2012*

**Physics**

wait nevermind i got it. i put in the wrong number. thanks :D
*June 20, 2012*

**Physics**

i did that for part a but i got 2.73 and the answer says its 2.87
*June 20, 2012*

**Physics**

A simple pendulum 1.50 m in length has a 500-g putty ball as an end bob. The pendulum is pulled aside 60° from the vertical and given an initial tangential speed of 1.20 m/s. At the bottom of the arc path, the bob hits and sticks to a 200-g putty ball sitting on a tee. (a...
*June 20, 2012*

**accounting**

kathy burnett works for trinity industries. Her pay rate is 12.84 per hour and receives overtime pay at one and one-half times her regular hourly rate for any hours worked beyond 40 in a week. During the pay period that ended December 31,2013, Kathy worked 48 hours. Kathy is ...
*June 15, 2012*

**math**

Find the distance to the horizon @ 32,000 feet.
*May 16, 2012*

**MATH**

An object is fired vertically upward with an initial speed of 68.6 meters per second. After t seconds, the height is shown by y = 4.9t^ + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s, what is the maximum height it will reach?
*April 26, 2012*

**biology**

need help with a paper from news article on human biology using scientific method?
*April 21, 2012*

**Pre-Algebra 2**

write a rule for the linear function in the table x 1, 2,3,4, f(x) -7, -10,-13,-16
*April 11, 2012*

**acids **

Which of the following bases is the weakest? (CH3)2NH , Kb = 5.1 x 10–4 ClO–, Kb = 2.9 x 10–7 SO42–, Kb = 8.3 x 10–13
*April 4, 2012*

**applied physics**

Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
*April 1, 2012*

**math**

simplify 15xy/35x
*March 28, 2012*

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
*March 12, 2012*

**Physics**

What is the magnitude of buoyant froce acting on a 720 cm^3 toy submarine foating in fresh water? (d water=1 g/cm^3)
*March 12, 2012*

**Physics**

A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?
*March 12, 2012*

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
*March 12, 2012*

**Physics**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? Is this answer right: 7800/10130 = 0.770
*March 12, 2012*

**Physics**

Use the first law of thermodynamics to determine the amount of heat change, Q, and whther it was added to or removd from the system. W=225J Delta U=600J Q=?
*March 11, 2012*

**Physics**

A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?
*March 11, 2012*

**Physics-Is this correct?**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? answer: 7800/10130 = 0.770
*March 11, 2012*

**Physics-is this correct?**

A person heats up a can of soup on a stove. If he does 250 joules of work on the soup by stirring it as the burner adds 1675 joules of heat, what is the change in its internal energy? I took 1675j - 250 j = 1425j
*March 11, 2012*

**Physics-is this correct?**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
*March 11, 2012*

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
*March 6, 2012*

**Physics**

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...
*March 6, 2012*

**social studies**

what happened to florida at the end of the american revolution
*March 6, 2012*

**Chemistry**

thank you Dr. Bob!
*March 5, 2012*

**Chemistry**

and for the sake of understanding.. can someone tell me what would happen if the reaction was exothermic instead of endothermic?
*March 5, 2012*

**Chemistry**

Consider this system at equilibrium. A(aq) <-> B(aq) Delta H = +750 kJ/mol .. What can be said about Q and K immediately after an increase in temperature? a] Q > K because Q increased.. b] Q>K because K decreased.. c] Q<K because Q decreased.. d] Q<K because ...
*March 5, 2012*

**Chemistry**

OHH (2.567)^2*0.637 = 4.197?! .. or was that a fail epiphany
*March 5, 2012*

**Chemistry**

Hi Dr. Bob, (3.03)^2 * 0.637 = 5.85? What would I do with the first equation that i got?
*March 5, 2012*

**Chemistry**

If someone could please be kind enough to see me through this problem? Calculate the value of Kp for the equation C(s) + CO2(g) <--> 2CO(g) Kp? Given that at a certain temperature.. C(s) + 2H2O(g) <--> CO2(g) + 2H2(g) Kp1 = 3.03 and H2(g) + CO2(g) <--> H2O(g...
*March 5, 2012*

**Chemistry**

thank you!
*March 5, 2012*