Monday

April 27, 2015

April 27, 2015

Total # Posts: 519

**chem**

For the reaction: N2+3H2<--->2NH3 4.000 mol N2, 2.000 mol H2, and 6.000 mol NH3 are placed in a 2.000 L container and allowed to reach equilibrium. When equilibrium is established the [H2]=2.77 M. Calculate the equilibrium concentrations of nitrogen and ammonia. ...
*April 19, 2015*

**chem**

For the reaction: N2+3H2 <-----> 2NH3 1.000 mol N2 and 1.000 mol H2 are placed in a 1.000 L container and allowed to establish equilibrium. When equilibrium is established the [N2] =0.921M. Calculate the equilibrium concentrations of hydrogen and ammonia. Calculate K.
*April 19, 2015*

**chem**

For the reaction: A+B <-----> 2C (all gases) 2.0 mol A, 2.8 mol B and 1.0 mol C are placed in a 2.0 L container and allowed to reach equilibrium. When equilibrium is established [C]=0.75 M. Calculate all equilibrium concentrations. Calculate K. I am so confused!
*April 19, 2015*

**math**

June has twice as much money invested at 5% simple annual interest as she does at 4 %. If her year income from the two investment is $315 how much does she have at each rate?
*March 20, 2015*

**English**

11- Before Derrell made a serious purchase, such as a car, he would study the competition?
*March 16, 2015*

**English**

10- Before finishing the meeting, the chair of the group offered many ideas?
*March 16, 2015*

**English**

8- We should consider traveling to China this summer?
*March 16, 2015*

**English**

@Ms Sue
*March 16, 2015*

**English**

could 6 be The faculty had made recommendations for the honor society?
*March 16, 2015*

**English**

I know the answers to 3, 5, 7, and 9
*March 16, 2015*

**English**

Identify awkward or pretentious diction in the following sentences, and revise each sentence as necessary to improve clarity. 2. Let’s have a discussion of the essay you read for homework. 3. Khaya finally came to the realization that she preferred research to teaching. 4...
*March 16, 2015*

**science**

A charge of +9.0 nC and a charge of +4.0 nC are separated by 50.0 cm. Find the equilibrium position for a −1.0 nC charge as a distance from the first charge. The Coulomb charge is 8.98755 × 109 N · m2 /C 2 . Answer in units of cm.
*March 13, 2015*

**Chemistry**

I need to use those numbers to find the final concentrations for each individual solution.
*February 24, 2015*

**Chemistry**

I have to use the given concentration of 7.03 micromoles/liters to determine the concentration for the following dilutions. 1. mL stock solution-2 mL distilled water-8 2. mL stock solution-4 mL distilled water-6 3. mL stock solution-6 mL distilled water-4
*February 24, 2015*

**English**

@ms sue, how about "How did the pilot know where in the air he was?"
*February 18, 2015*

**English**

Identify the simple sentences in the following paragraph. I know the first and third sentences are simple. The air show announcer hushed. He had been squawking all day, and now he quit. The crowd stilled. Even the children watched dumbstruck as the slow, black biplane buzzed ...
*February 18, 2015*

**geometry**

i need help on a question that involves finding the "value of the variable" ive started the question but im stuck of how to continue .its a right triangle which hypotenus length is cut by a altitude line "w+9" .the lengths cut are 8 and 18 .
*February 11, 2015*

**Science**

California's volcanoes formed as a result of colliding boundaries.
*February 6, 2015*

**Chemistry**

the titration of an ascorbic acid requires 18.5 mL of .0105 M KIO3. how many mmol of ascorbic acid were in this sample?
*February 4, 2015*

**English 10 help please**

metaphoe
*November 18, 2014*

**Trig**

the angle of elevation to the sun is 65 degrees. A building casts a shadow 16m long. What is the height of the building to the nearest meter?
*November 17, 2014*

**Algebra**

You invest an initial $4,500 in an account that has an annual interest rate of 4.5%, compounded daily. How much money will you have in the account after 10 years? Round your answer to the nearest whole number.
*November 12, 2014*

**calculus**

Use l'hopital's Rule to evaluate lim x in 0 of (4x(cos 6x-1 )) / sin 3x-3x
*November 8, 2014*

**math**

Richard put a counter on 6. He counted by tens. what are the next 3 numbers he counted? My answer is: 16, 26, 36
*November 3, 2014*

**calculus**

never mind i got it thanks
*November 3, 2014*

**calculus**

A spotlight on the ground is shining on a wall 24m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 1.2m/s, how fast is the length of her shadow on the building decreasing when she is 4m from the building?
*November 3, 2014*

**Algebra**

Find the dimensions of the rectangle of the largest area that can be enclosed by 200 meters of fencing
*October 27, 2014*

**calculus**

The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres. Use differentials to determine: a) by approximately how many centimetres the side length of the cube increases ? B) by approximately how many square centimetres does the surface area of ...
*October 12, 2014*

**Calculus**

The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres Use differentials to determine : (a) by approximately how many centimetres does the side length of the cube increase? (b)by approximately how many centimetres does the surface area of the...
*October 11, 2014*

**Logic**

mushroom & purple => poisonous mushroom & poisonous => purple mushroom & ~purple => ~poisonous mushroom & purple => ~poisonous
*October 6, 2014*

**physics**

An electron travels 2.7 m in 6.37 × 10−8 s. How fast is it traveling?
*September 30, 2014*

**CHEM**

In the preparation of a rock salt solution, 1.522 grams of impure rock salt was dissolved in 50.0 ml of distilled water. The total mass of the solution was found to be 51.522 grams. Calculate the weight percent of impure rock salt in the prepared solution.
*September 26, 2014*

**math**

I have a 15ft board I need to cut into 2 1/8 inch pieces how many can I cut
*September 17, 2014*

**Maths**

How would you convert 11 minutes into hours?
*September 14, 2014*

**Grade 10 Maths**

An area for planting crops is given by: A = 800 + 20x - 1/2x^2 Find the value of x which the area is a maximum
*September 11, 2014*

**physics**

bob pursley, can you answer my question. SCIENCE BIOLOGY. My name is Julia. THanks. I have till 12 am. HELPPPP
*September 3, 2014*

**SCIENCE:BIOLOGY>**

bELIEVE ME OR NOT BUT i'M PRETTY SURE I HAVE MINE RIGHT.THX FOR YOUR HELP ..NOT! tHANKS DR.bOB222
*September 3, 2014*

**SCIENCE:BIOLOGY> **

1. How many seconds do you spend in school during the week (6.5 hours/day)? 2. How many micrograms are in 12 dekagrams? 3. How many centimeters are in 5 kilometers? 4. 3.25 liters are equal to how many kiloliters? 5. how man meters are in 0.65 hectometers? 6. How many grams ...
*September 3, 2014*

**chemistry**

Dr.Bob can you answer my questions. My name is Julia.. my topic is in Science:Biology
*September 3, 2014*

**History/ English**

please help!
*September 3, 2014*

**History/ English**

What does the novel 1984 by George Orwell teach us about history? In what ways is Winston a historian?
*September 3, 2014*

**math**

Determine whether the system of equation is in row-echelon form. x-y+3z=-11 y+8z=-12 z=-2
*June 17, 2014*

**Math**

A hair product company sells three types of hair products for $30, $20, and $10 per unit. In one year, the total revenue for the three products was $800,000, which corresponded to the sale of 40,000 units. The company sold half as many units of the $30 product as units of the...
*June 17, 2014*

**Chem**

Oops 0.10 mol NaOH
*May 27, 2014*

**Chem**

When 1.10 mol of NaOH is added to 1.00 L of 0.30 M HCl the pH of the resulting mixture is: a) 0.52 b) 0.70 c) 1.00 d) 13.30
*May 27, 2014*

**Scientific Method**

B is the correct answer
*May 25, 2014*

**English**

Choose the answer that identifies the function of the gerund in the sentence. Yes, this player has worked hard on improving his strength this season.
*May 24, 2014*

**Chemistry**

Thanks :)
*May 17, 2014*

**Chemistry**

Explain why methyl red would be a good indicator for a titration of 0.25M NaOH with .025M HNO3, but a poor choice for use in a titration of 0.25M NaOH with 0.25M HCN. I'm pretty sure the first step is to find the pH of the two titrations (and then compare those to the pH ...
*May 17, 2014*

**math**

I'd convert it to minutes. 14x60=840 (plus the 3 minutes)=843minutes Divide 843 by 3 = 281minutes Then convert back to hours and minutes... 281 divided by 60 = 4hr (leave out the decimals since they represent the left over minutes) 4x60=240 (this is the time already ...
*May 17, 2014*

**Math**

175g AgCl x (1 mol/247.9g) x (1 Ag2S/2AgCl) x (143.4g/1 mol) = 50.615g Ag2S I'm assuming you've learned about basic stoichiometry and how to use mole bridges? Otherwise this type of question wouldn't be asked.
*May 17, 2014*

**math **

Terry wants to buy one pair of moccasins. She can choose from some that costs $22.50, $27.00, $20.95, and $24.75. How much will Terry save if she buys the least expensive instead of the most expensive pair?
*April 29, 2014*

**MATH**

Thank you.
*March 26, 2014*

**MATH**

14% of what number is 84?
*March 26, 2014*

**CHEM**

Can you show me the formula I need to do this problem. please a solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 2.60 ml. What is the molarity of the solution? thank you
*March 25, 2014*

**CHEM**

can you show me the formula for this problem. calculate the grams of NaOH present in 9.0 ml of a 8.0 (m/v) NaOH solution. thank you
*March 25, 2014*

**chemistry**

Calculate the concentration in % (m/m) of a solution containing 20.5 g of LiF dissolved in 340.0 g of H2O. a.1.14% (m/m) b.5.69% (m/m) c.6.03% (m/m) d.6.42% (m/m)
*March 23, 2014*

**chemistry**

In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2
*March 23, 2014*

**Math**

Write in order from least to greatest. +3,-1,-4,+2,0
*March 18, 2014*

**Physics**

Block A in the figure weighs 48.0N . The coefficient of static friction between the block and the surface on which it rests is 0.250. The weight w is 6.00N and the system remains at rest. -Find the friction force exerted on block A. -Find the maximum weight w for which the ...
*March 8, 2014*

**physics**

A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
*February 10, 2014*

**physics**

A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
*February 10, 2014*

**math**

If x varies inversely withy 3, and x=6 when y=3, find x when y=2.
*February 4, 2014*

**math**

A robotic basketball player tosses a ball upward from a height of 7 feet, at an initial speed of 111 feet per second. The height of the ball is modeled by the equation: h=−16t2+111t+7, where h is the height above the ground in feet and t is the time measured in seconds. ...
*February 4, 2014*

**math**

You are putting a brick walkway along two sides of a rectangular garden that measures 6 meters by 15 meters. The path will run the length of the garden, turn the corner, and run along the width. You only have enough brick to cover 46 square meters. How wide should the border be?
*February 4, 2014*

**Math**

Mushrooms produce a tremendous number of spores. However, very few spores go on to establish a new mushroom colony. A "colony" is actually a little bunch of fuzzy-looking cells called a mycelium. Let's say a particular mushroom produces a billion spores in a day...
*January 1, 2014*

**Math**

Uncle Joe made chocolate chip cookies. Eric ate fifty percent of them right away. Ryan ate fifty percent of what was left. Ten cookies remain. How many cookies did Uncle Joe make?
*January 1, 2014*

**Math**

There are three hundred students at Mackenzie Middle School in Brain City. If 57% of the students are female, what is the ratio of female students to male students? Answer in lowest terms
*January 1, 2014*

**Math**

The local election is over and a new mayor has been elected to lead Big Town. The new mayor received three votes for every vote received by her opponent. The new mayor received 2,541 votes. How many votes did her opponent receive?
*January 1, 2014*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 60 m behind the train, traveling in the same direction as the train at 41 m/s and accelerating at 5 m/s2. What is the speed of the car just as it passes the train? Answer...
*October 16, 2013*

**Physics**

r << 1.3e-4
*October 15, 2013*

**physics**

KE = (1/2)(m)(v)^2 = (0.5)(4)(5)^2 = 50 J Constant friction force encountered: N = (0.94)(4)(10) = 37.6 N Energy absorbed by friction: Fd = 37.6x Energy absorbed by the spring: =(1/2)(17)(x)^2 =8.5x^2 Final Equation: 50 = 8.5x^2+37.6x 0 = 8.5x^2+37.6x-50 Solve the quadratic ...
*October 15, 2013*

**physics**

r^3 << (3*(C_1)^2)/(4*pi*C_2*oil density*g) r^3 << (3)*(2.30e-4)^2 / (4)(3.14)(0.88)(660)(10) r << 1.3e-4
*October 15, 2013*

**Algebra 1**

One long-distance telephone company offers a plan such that the first 20 minutes costs $.99 and each additional minute costs $.09. Solve an inequality to find the maximum amount of full minutes you can talk for $5.00. At first I got: 5 is greater than or equal to .99+(1.8-.09m...
*October 14, 2013*

**physics**

Hello Can you explain the first equation? distance=V(t-10)+V/2 * 10 Where is this distance coming from for me to be able to solve for V? Also where is the 10 coming from in V(t-10) and V/2*10? My final equation solving for V is : V= 10d / 4(t-10)
*October 5, 2013*

**US History**

What political influences shaped the governments of the British Colonies
*October 1, 2013*

**Geometry proving quadrilaterals **

Proving quadrilaterals PLEASE PLEASE PLEASE HELP *the diagonals of a square bisect the vertex angle * the diagonal of a rhombus are perpendicular *each diagonal of a rhombus bisects the opposite angles of the rhombus help me prove please how ? tell me
*September 30, 2013*

**Math 6th Grade Level**

A baker bought 680,000 oz. of flour and packed the flour into 200 bags of equal size. He used some flour and had 100 bags left. He decided to repack the remaining flour bags into bags of 5,000 oz. bags. How many bags of flour did he have in the end?
*June 19, 2013*

**Math **

Mei packed 783 strawberries equally into 9 cartons. After giving 4 cartons to her neighbors, she decided to repack 5 strawberries into each carton. How many cartons of strawberries did she have in the end?
*June 19, 2013*

**Math**

A homeowner empties her hot water heater every 36 days and changes the filter in the heat pump every 48 days. She did both on Friday September 17, 2012. When again will she do both on the same day? (give the day of the week, the date, month, and year)
*June 17, 2013*

**physics**

The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and...
*May 30, 2013*

**organic chemistry**

for each of the following compounds, draw the form in which it will predominate at ph=3, ph=6, ph=10, and ph=14. a)CH3COOH b)CH3CH2NH3 c) CF3CH2OH please explain how to get answers. my book does not give clear examples.
*May 30, 2013*

**BIOLOGY!!!!!!**

What is the reletive amounts of mRNA that will e transcribed if there is no promoter and enhancer?
*May 22, 2013*

**French**

Help me conjugate this in French? Need help Atterrir, tu Fleurir, les plantes Fondre, les garcons Perir, les fleurs Penser, tu Manger, vous Verifier, les professeurs Marcher, le chat noir
*May 16, 2013*

**chemistry**

i need help also
*May 15, 2013*

**math**

I need 2 three digit numbers that total 16848
*April 22, 2013*

**finance**

Mrs. Kay who is 24 years old plans to retire at the age of 60. Mrs. Kay would like to be able to withdraw $120,000 per year from her retirement account for 40 years after retirement beginning a year after her retirement. She already has $15,000 in her retirement investment ...
*April 17, 2013*

**chemistry**

What is the specific heat of an unknown substance if a 2.31 g sample releases 12.5 cal as its temperature changes from 24.9°C to 20.7°C? Please explain ans show steps.
*April 16, 2013*

**math**

a storage crate has the dimensions : 12ft * 6ft *5ft. how many cube-shaped boxes measuring 8 inches in length could be stacked completely within the cube??
*April 10, 2013*

**Chemistry**

Enough of a monoprotic acid is dissolved in water to produce a 1.47 M solution. The pH of the resulting solution is 2.64. Calculate the Ka for the acid.
*April 10, 2013*

**adv functions**

Hi! I need help with determining the value of each of the following logarithmic expressions. Do not change the bases- thx a) log[base8]4 b)log[base(1/3)]27
*April 7, 2013*

**Physics**

if a toy car's motor propelled it 1.905m in 7.1 seconds and it kept rolling .38m for 8.6 seconds what is the coefficient of friction between the wheels and the floor assuming that is the only source of friction. i know accel=.08m/s2 and -.12m/s2 but after that i got lost.
*April 5, 2013*

**Physics- so confused!!**

I am not sure. I think the speeds are for the bullet before and after passing through the block. However, in the diagram the second block is in a different spot after the bullet hits it.
*March 23, 2013*

**Physics- so confused!!**

A bullet with a mass of 5.40 g is fired horizontally at two blocks resting on a smooth and frictionless table top as shown in the Figure. The bullet passes through the first 1.20 kg block, and embeds itself in a second 1.20 kg block. Speeds v1 = 3.90 m/s and v2 = 1.70 m/s, are...
*March 23, 2013*

**chemistry**

At 2273 K, Keq = 6.2 multiplied by 10-4 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) If [N2] = 0.04700 mol/L and [O2] = 0.01200 mol/L, what is the concentration of NO at equilibrium? please answer and explain this one as well.
*March 11, 2013*

**chemistry**

please help and explain. At a certain temperature, Keq = 10.5 for the equilibrium below. CO(g) + 2 H2(g) equilibrium reaction arrow CH3OH(g) Calculate the following concentrations. (b) [H2] in an equilibrium mixture containing 1.01 mol/L CO and 0.335 mol/L CH3OH
*March 11, 2013*

**Chemistry**

I was taught that hydrogen bonds are actually very weak, but it may just be a matter of different teachers. I would answer C) Covalent Bonding because they SHARE an electron keeping them very close and tight.
*March 10, 2013*

**Science**

77.15 ....YAY GOOGLE!
*March 10, 2013*

**language**

Well this totally depends on the child. My younger siblings all started around six, but this could vary.
*March 10, 2013*