Monday

September 15, 2014

September 15, 2014

Total # Posts: 202

**Chemistry**

A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal lose? Please ...
*September 13, 2014*

**Chemistry**

Thank you so much!!
*September 13, 2014*

**Grammar: PLEASE HELP**

What's the difference among a simple sentence, complex, compound, and compound-complex. I always have a difficult time knowing which is which, except simple sentence of course, that one is easy
*May 7, 2014*

**chemistry**

Can CoBr2+ NH4Br + NH4OH ---> Co^2+ (aq) + 2NH3 (l) + H^+ (aq) + H2O (l) + 3Br^- form the complex [Co(NH3)5Br]Br2 if so please explain
*May 4, 2014*

**CORE MATHS**

The first two terms in the expansion of (1+ax/2)^10 + (1+bx)^10 in ascending powers of x., are 2 and 90x^2 Given that a is less than b find the values of the constants a and b . (11 marks) Thanks :)
*March 20, 2014*

**English**

Hello, what is a common theme between the Shakespeare's Romeo and Juliet, To Kill a Mockingbird, and Roahl Dahl's Lamb to the Slaughter? Please give examples of the the theme found within in the 3 books. It's just that I have to write a formal literary essay ...
*December 10, 2013*

**chemistry**

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy
*December 6, 2013*

**chemistry**

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy
*December 6, 2013*

**chemistry**

Hello ellie again. I am still having trouble understanding bombardment. The question I'm working on says Complete the bombardment reaction ? + 40-18Ar → 43-19K + 1-1H
*December 5, 2013*

**chemistry**

Hello this is ellie again. I was wondering could you explain what a bombardment reaction is and and show an example of it? Thanks
*December 5, 2013*

**chemistry**

I am having trouble understanding what the concept is for writing these out. Write a balanced nuclear equation for the alpha decay of each of the following radioactive isotopes: curium-243, 22589Ac
*December 5, 2013*

**chemistry**

hello this is ellie again. I need help on this one problem A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 ...
*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(lIf 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?)
*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?
*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?
*December 3, 2013*

**chemistry**

I have a balance equation but i need to know how to find the different states of each element. How do I do that? Ca + 2 HNO3 => Ca(NO3)2 + H2
*December 2, 2013*

**math/ algebra 1**

ok thank you :D
*November 10, 2013*

**math/ algebra 1**

right
*November 10, 2013*

**math/ algebra 1**

x>15
*November 10, 2013*

**math/ algebra 1**

can someone please help me explain how they got this answer and can someone please show me the steps into solving this question? Q: Four more than the quotient of a number and three is at least nine.
*November 10, 2013*

**chemistry**

hello i am having trouble writing these two ionic equations. could someone explain to me how to do that? 1.)K2SO4(aq) and Na2CO3(aq).Write the ionic equation. 2.)RbCl(aq) and KOH(aq).Write the ionic equation.
*November 4, 2013*

**chemistry**

When I solved the equation I got 3.1 grams of NO2. That isn't the correct answer. What did I do wrong?
*October 26, 2013*

**chemistry**

In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted? I know that you use the equation n=PV/RT to get the number...
*October 26, 2013*

**Chemistry**

How are we suppose to solve for the molar mass because we don't have the chemical formula for the gas?
*October 24, 2013*

**chemistry**

thanks for your help
*October 24, 2013*

**chemistry**

When I've done the equation I've gotten 713.971 K for the first part. What have I done wrong?
*October 24, 2013*

**chemistry**

A 0.286g sample of carbon dioxide, CO2, has a volume of 585mL and a pressure of 495mmHg . What is the temperature, in kelvins and degrees Celsius, of the gas?
*October 24, 2013*

**Math**

The temperature at 6,000 m altitude is 11 degrees Celsius. At 4,000 m, the temperature is at 2 degrees Celsius. How much colder is it at 6,000 m than at 4,000 m? What is the difference in temperature?
*September 12, 2013*

**science**

An insect inside a bus flies from the back toward the front at 2 m/a. The bus is moving in a straight line at 2m/a. What is the speed of the insect?
*September 7, 2013*

**maths**

the equation for the motion of an object with constant acceleration is d=vt+0.5at^2where d is the distance travelled in ft, v is the starting velocity in ft/s a is the acceleration in ft/s^2 and t is time in seconds a race car begins with a velocity of 200ft/s and accelerates ...
*August 16, 2013*

**human services**

• Can we have client advocacy, a forum for conflict resolution, and agents for policy change without competing for limited dollars and resources? Why? What do you see as the most vital function?
*August 7, 2013*

**math**

Thank you!!!
*May 12, 2013*

**math**

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks it is 1/16, since ...
*May 12, 2013*

**math**

Which two rectangles have an area of 72 square centimeters? A. length 12 cm, width 6 cm B. length 20 cm, width 16 cm C. length 9 cm, width 8 cm D. length 8 cm, width 7 cm
*May 7, 2013*

**math**

ok thank you for explaining that.
*March 29, 2013*

**math**

Tina solved for the decimal value 0f (3/5*18) and got an answer of 5.4. Four of her classmates argued that her answer was not reasonable. Which of the following statements best explain why that value can not =5.4 A. the number 18 is a multiple of 3 , so the answer must be a ...
*March 29, 2013*

**math**

Thank you, I wasn't thinking the distance, I was thinking the actual numbers of -4 and 5, you helped me see how this is done. Thanks a lot
*March 29, 2013*

**math**

a number line below -5 -4 -3 -2 -1 0 1 2 3 4 5 Which of the expressions below represent the distance between -4 and 5 on the number line? [ ]= absolute value symbol A. [-4+5] B.[4-5] C.[-4-5] d.[-5-(-4)] I believe it is D, since the absolute value of a neg. number is positive...
*March 29, 2013*

**math- please help**

Thank you so much for your help.
*March 28, 2013*

**math- please help**

How do you figure this out? I don't know how to do it? Can you please explain how you would get b? Did you just divide each side by m? Thank you for your help
*March 28, 2013*

**math- please help**

This helped alittle but the answers were multiple choice a. c B. 60 C. m D .m/c That is why I thought the best answer was c. = m Is this correct?
*March 28, 2013*

**math- please help**

a copy machine makes c copies in m minutes according to the equation c=60m. what is the unit rate of copies per minute? I think it is m but not sure, can you help me understand how to figure out this equation. Please help! Thanks
*March 28, 2013*

**math**

a copy machine makes c copies in m minutes according to the equation c=60m. what is the unit rate of copies per minute? I think it is m but not sure, can you help me understand how to figure out this equation. Thanks
*March 28, 2013*

**Math**

a park is 3/4 mile long and 1/2mile wide. Which fraction represents the ratio of the parks length to its width? I did it by 3/4 divided by 1/2 this equals 1 1/2 or 3/2 Is this correct?
*March 28, 2013*

**Math**

I see what you did, but I thought TT was always done last, so I added and then multiplied TT. Is there an order of operation for Pi?
*March 16, 2013*

**Math**

1st I added 16 plus 64=80. Then I multiplied 80 by TT and got 251.3 The last part should be 251.3 I messed up on the last number. so is 251.3 correct? Thank you for checking my work, I appreciate it.
*March 16, 2013*

**Math**

The heart shaped card is made by placing a square card and two semicircles together. What is the area of the card. each side of the sqare is 8cm long. I did a=TTr(squared)+lw A=TT4squared+8(8) A=TT16+64 A=80TT A+251.3274123 A=251.3 cm(squared) The total area of the card is 257...
*March 16, 2013*

**chemistry**

The solid oxide of generic metal M is added to 75 mL of water and reacts to produce a basic solution that is 0.20 M in the resulting compound. Neutralization of the solution required titration with 27 mL of 0.56 M HCl. How many valence electrons must M have?
*March 2, 2013*

**Chemistry. Please help!**

Fe3+ + I1- ¨ Fe2+ + I2 1. Balance the equation 2. Which element is being oxidized? 3. Which element is the reducing agent?
*February 20, 2013*

**Physics**

If a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time? Please provide explanations and solutions. Thanks in advance :D
*February 4, 2013*

**Physics**

At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide solutions and ...
*February 4, 2013*

**Physics**

A 2.0kg block hang from a vertical spring causes it to stretch by 200cm. If the 2.0kg block is replaced by a 0.50kg mass and the spring is stretched and released, what are the frequency and period of the oscillations? Please help and provide solutions and explanations. Thank ...
*January 22, 2013*

**Math**

during a match, pat kicks a football onto the roof of the stand. The stand and the path of the ball are at righ angles to each other. The path of the ball is given by y=2.5x-x^2÷15 The roof of the stand is given by y=x÷2+48 ÷5, where 18</=x</=40. All...
*November 13, 2012*

**Physics**

Im not sure what equations to use other than the equation for potential energy or the equation for work. That is about as far as I have come to solving the problem.
*September 21, 2012*

**Physics**

A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1. (a)What is the power output of the crane. (ignoring losses)? (b)If it takes the cran2 2 minutes to raise the payload to its final height, how far above the ground is this? (c)If the cable were to ...
*September 21, 2012*

**Physics**

During a car crash a 65kg person's head goes from traveling at 50km h-1 to stationary in 0.15s. (a)What is the magnitude of the average net force acting on the head of a person with a 4.5kg head? (b)How does this compare with the weight force acting on the person?
*September 21, 2012*

**Physics**

The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the gravitational force acting on it...
*September 21, 2012*

**Physics **

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)
*September 21, 2012*

**Physics **

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)
*September 21, 2012*

**Physics**

Two 30kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80m tall hill and they are traveling at 30 km h-1 when they reach the bottom. (The cart had brakes!) How much work was done on the cart by friction during its travel down the ...
*September 21, 2012*

**health**

I would say sedentary lifestyle, diet, smoking, drinking, genetics are all challenges to over coming health and wellness. To overcome these you must change your habits, your lifestyle, the food that you eat and the amount of exercise that you do. This is a short version but ...
*September 21, 2012*

**Math**

What is the value of x when the line crosses the x-axis?
*September 11, 2012*

**Math**

The length of the shortest piece is 4.2ft.
*September 11, 2012*

**Religion**

i need to write an essay about if anne frank's life is relevant to teenager's today. Please hele me!!
*June 24, 2012*

**English/History**

In Maus, what 3 times does Vladek almost die, but is saved? I feel like there are a ton of times he could have dies (being in the concentration camps alone is life-threatening enough), but I'm not sure what specific times Vladek was really close to death, but was saved? If...
*May 20, 2012*

**science**

Can someone please help me with this question? please.
*May 19, 2012*

**science**

John folded a wet washcloth in four. Mary spreads hers out. Which washcloth dried the quickest???And please explain.
*May 19, 2012*

**World History**

For a project I'm doing for world history, I have to include 2 "VIP's" for Winston Churchill. Does anyone know of a person who contributed to Churchill's fame or someone who was important to Churchill that I could research to include as one of my VIP'...
*April 11, 2012*

**Science**

help me!!!!
*April 10, 2012*

**Science**

what are two things that you must know to determine speed?
*April 10, 2012*

**Science**

I have that problem and I am solving it and so far I got the amplitude which is 0.2
*March 22, 2012*

**english 4**

Sandy's throw to first base was short. what is the subject and verb etc..
*March 22, 2012*

**chemistry - science**

molarity=moles of solute/volume of whole solution in litres so the mass of Na/molar mass of NaOH all divided by .250Litres 4g/40g divided by .250 litres is .4 M. The answer is .4
*February 17, 2012*

**french**

sorry i did not see the one that you have already corrected so i reuploaded it thank you for correcting it
*November 10, 2011*

**french**

for my homework we had to write a paragraph on what we do to help out around the house could you please let me know if there are grammar or spelling mistakes and tell me where i made mistakes and what i should have said instead Pour aider autour de la maison je décharge...
*November 10, 2011*

**french**

for my homework we had to write a paragraph on what we do to help out around the house could you please let me know if there are grammar or spelling mistakes Pour aider autour de la maison décharger le lave-vaisselle quand il doit être fait et j'ai aussi aider...
*November 9, 2011*

**Physics**

A bullet of mass 4.8 g strikes a ballistic pendulum of mass 3.3 kg. The center of mass of the pendulum rises a vertical distance of 9.7 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed. ....I'm getting an answer of ...
*October 31, 2011*

**french**

Hello i made all the corrections you told me too how does this look :) please tell me if there are any morre grammar or spelling mistakes Bonjour, Mathilde Je m’appelle Ellie. J’ai quatorze ans et mon anniverse c’est le sept juillet. J’ai les cheveux longs ...
*October 27, 2011*

**french**

I am Ellie but Ruth is my friend and is in my class for french so we are doing the same work thank you
*October 26, 2011*

**french**

thank you so much for taking so much time into helping me perfect my french essay I have done the corrections you have told me to do and I was wondering if you could go through and make sure the lanuage and grammer are all perfect. And thank you I really appricate it Also, how...
*October 26, 2011*

**Biology**

My teacher asked me this question and I do not know the answer would you be able to tell me and why thank you large bodies loose a smaller percentage of heat to their surroundings than smaller bodies. Why?
*October 26, 2011*

**french**

My homework task is to write an introductory email to my french exchange partener about:yourself, how you get on with your family, what your views on marriage are, a descrition of your best friend(s), what you did yesterday and what your plans for the weekend are? I have ...
*October 26, 2011*

**French**

My homework task is to write an introductory email to my french exchange partener about:yourself, how you get on with your family, what your views on marriage are, a descrition of your best friend(s), what you did yesterday and what your plans for the weekend are? I have ...
*October 25, 2011*

**French**

My homework task is to write an introductory email to my french exchange partener about:yourself, how you get on with your family, what your views on marriage are, a descrition of your best friend(s), what you did yesterday and what your plans for the weekend are? I have ...
*October 25, 2011*

**physics**

Water from a garden hose that is pointed 21° above the horizontal lands directly on a sunbather lying on the ground 4.3 m away in the horizontal direction. If the hose is held 1.4 m above the ground, at what speed does the water leave the nozzle?
*October 16, 2011*

**science**

hi im eleven and i know nothing about acids and alkalis so plz help it sez nothing here about them...
*October 2, 2011*

**Pre-Calc**

The 30fd was under the square root sign-thank you
*September 18, 2011*

**Chemistry**

Given the following heats of combustion. CH3OH(l) + 3/2 O2(g) CO2(g) + 2 H2O(l) ΔH°rxn = -726.4 kJ C(graphite) + O2(g) CO2(g) ΔH°rxn = -393.5 kJ H2(g) + 1/2 O2(g) H2O(l) ΔH°rxn = -285.8 kJ Calculate the enthalpy of formation of methanol (CH3OH) from ...
*September 18, 2011*

**chemistry**

It says that answer is off by a multiple of ten.
*September 18, 2011*

**chemistry**

A 51 kg person drinks 330. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in ascending is...
*September 18, 2011*

**Pre-Calc**

Please check answer and help with one of them: 1. check please car in an accident speed of car is the s, d is length of skid=30 feet f is coefficient=0.5 use formula to find s=sqaure root of 30*f*d My answer is 21.21 because I took square root of 30(0.5)(30) 2. this one is ...
*September 18, 2011*

**Algebra**

How many terms are in this sum? 5x-6a+8
*September 13, 2011*

**Accounting**

40,000 / end of year 130,000
*August 16, 2011*

**English**

Thank you Ms. Sue In continuing with the medium question twitter I say I like Paris but email to my boss I like Paris because of the food and scenery. College formal essay I go into depth of why I like Paris. Is that difference?
*July 14, 2011*

**English**

How does the medium in which you are communicating your message influence your writing and editing styles? I think it means medium of writing is what type of writing the person is doing. But I am not sure help please :-) I am a little confused.
*July 14, 2011*

**calculus**

A police car is driving northward, chasing a vehicle which has just taken a right turn at an intersection, and is travelling due west. When the police car is 600 yards south of the intersection, and the car is 800 yards east of the intersection, an aerial speed radar indicates...
*April 12, 2011*

**music**

which one of the following pieces of music would you most expect to be played by a full orchestra
*April 6, 2011*

**Spanish 8th grade**

Thank you-
*April 5, 2011*

**Spanish -Please check-I think I got it8th grade**

I think I figured it out. It would be Tengo ganas de estudiar. Tengo ganas de correr Tengo ganas de tocar la fluta.
*April 5, 2011*

**Spanish 8th grade**

I have to write a sentence saying that I feel like doing some activity say playing baseball of football-it doesn't matter. We are suppose to use the tener form so I'm really confused. Thanks for helping. I thought it would Me gustaria(accent over i) jugar whatever but ...
*April 5, 2011*