Sunday

August 30, 2015
Total # Posts: 1,885

**college chem**

Ammonium carbonate (solid) decomposes when heated to produce three gaseous products - ammonia, water, and carbon dioxide. 1. Write the balanced equation for the reaction. 2. Suppose that ammonium carbonate is heated to 500 K in a sealed vessel. At equilibrium there is still ...
*May 18, 2010*

**chem**

Ammonium carbonate (solid) decomposes when heated to produce three gaseous products - ammonia, water, and carbon dioxide. 1. Write the balanced equation for the reaction. 2. Suppose that ammonium carbonate is heated to 500 K in a sealed vessel. At equilibrium there is still ...
*May 13, 2010*

**Trigonometry**

In this problem, you will describe in detail how we arrive at the accepted definition of the function y= Arccsc(x) a) Sketch the cosecant function over the interval (-2pi, 2pi) i can do that b) This function is not one to one - please explain in detail the meaning of this ??? ...
*May 12, 2010*

**Chemistry**

I have no idea what I'm doing wrong here... Question: A solution is 0.3% by mass calcium chloride. Therefore, 145 g of the solution contains how many grams of calcium chloride? My solution: 145g x (0.3g / 100g) = 0.435g or 0.44g CaCl2 What am I doing wrong? Thank you!
*May 9, 2010*

**Chemistry**

Dr.Bob222 - You are absolutely right. It totally slipped my mind that 0.3 has ONE sigfig. Thank you.. your help is much appreciated!
*May 9, 2010*

**Chemistry**

I have no idea what I'm doing wrong here... Question: A solution is 0.3% by mass calcium chloride. Therefore, 145 g of the solution contains how many grams of calcium chloride? My solution: 145g x (0.3g / 100g) = 0.435g or 0.44g CaCl2 What am I doing wrong? Thank you!
*May 9, 2010*

**history**

what was the name of the ship that Sir Neville Howse came home on after WW1 also the date of return to Australia
*May 9, 2010*

**trigonometry HARD!!**

An airplane flies due north from a starting point at 234.6 mph for 40 minutes. Then turns flying 20 minutes at 252 mph in the direction N 20 degree 31 minutes East. How many miles is the airplane from the starting point?
*May 4, 2010*

**Chemistry**

I think I understand, but the thing that I'm still a bit confused about is how ionic forces and dipoles differ. If dipole-dipole is + to -, then are ionic forces opposite charges as well? They must be in order to attract. Sorry if I'm being stupid.
*May 1, 2010*

**Chemistry**

The forces holding together an ionic solid are much stronger than the forces between particles in a molecular solid. How are these strong forces reflected in the properties of an ionic solid? a) strong hydrogen bonding exists between discrete molecules b) strong dipole-dipole ...
*May 1, 2010*

**Chemistry**

Thank you!
*May 1, 2010*

**Chemistry**

For #1 I think all three because there's hydrogen bonding between the O-H, there's dipole-dipole between C-H and there's Londond dispersion between the individual H. If that's the case, then all three would apply for #2 as well. Am I close?
*May 1, 2010*

**Chemistry**

Discuss the types of intermolecular forces acting in the liquid state of each of the following substances. (Select all that apply.) 1. CH3CH2CH2CH2OH a) dipole-dipole forces b) London dispersion forces c) hydrogen bonding 2. CH3OH a) dipole-dipole forces b) London dispersion ...
*May 1, 2010*

**chemistry**

I'm the one who posted the question... this is how I'm doing part A. I'm told it's the wrong answer, but I can't figure out what I'm doing wrong. I'm hesitant on going to parts B and C until I understand part A. Part A: Step one: I changed the mols ...
*May 1, 2010*

**chemistry**

Some properties of aluminum are summarized in the following list. normal melting point 658°C heat of fusion 0.395 kJ/g normal boiling point 2467°C heat of vaporization 10.52 kJ/g specific heat of the solid 0.902 J/g°C (a) Calculate the quantity of energy required ...
*May 1, 2010*

**Social**

Yeh i agree with you about wikipedia, but my teachers lame. Trust me i wish i could get a new teacher. Marketing of prescription drugs actually sounds pretty interesting thanks!
*April 30, 2010*

**Social**

Hi i have 2 weeks to write a paper about anything related to marketing. It has to be 7 pages so I need a good topic and a place to find solid information (our teacher said don't use wikipedia at all because he hates it). I was wondering if you could help me get started. ...
*April 30, 2010*

**Science- Chemistry Ap**

2SO3(g) -> 2SO2(g) + O2(g) Delta H = 197kj For this reaction shown above, describe the changes that will occur to the number of moles of SO3 under the following conditions: (a) Additional oxygen is added to the reaction vessel. (b) The pressure in the reaction vessel is ...
*April 28, 2010*

**college algebra**

[x+2]=5 solve for x I have an answer of (3,7) is this correct or could this be (3, -7)
*April 23, 2010*

**college algebra**

[x+2]=5 solve for x I have an answer of (3,7) is this correct or could this be (3, -7)
*April 23, 2010*

**college algebra**

f(x)=x^2+3; g(x)=x+4 find (fog)(-2) I have an answer of -7 or could this be just 7
*April 23, 2010*

**college algebra**

solve for x (2x-7)*(x+4)=0 i have an answer of (7/2 -4) is this correct or is the answer 5,4
*April 23, 2010*

**college algebra**

find the vertex f(x)=3x^2-6x+8 I have an answer of -1 and 17 I believe that the correct answer is 1,5 is this correct
*April 23, 2010*

**college algebra**

give the following linear equations 2x+3y=10 4x-6=-28 I have an answer of (-1,4) or couls this be (0,4)
*April 23, 2010*

**college algebra**

I have a line equation whose slope is -2 and passes through(-1,6) I have a slope intercept form of y=-2x+4 is this correct or could this be -2x+8
*April 23, 2010*

**college algebra**

solve for x 3(x-2)= -4(x+8)+10 my answer to this was -16/7 however I believe the answer is -36/7 did I solve this with the right answer.
*April 23, 2010*

**college algebra**

f(x)=x^2-4x-2 g(x)=x+7 what is the function using (f.g)(x) my answer is x^3-3x^2-30x+14 is this the correct answer
*April 23, 2010*

**college algebra**

what is the y value of the vertex f(x)=x^2+6x+5 I have an answer of 4 this is important because I come up with -4 and I believe the answer to this is 4
*April 22, 2010*

**college algebra**

what is the x value of the vertex f(x)=x^2+6x+5 my answer is -3 is the correct
*April 22, 2010*

**college algebra**

f(x)=4x/x-2 what is the y-intercept, I believe this to be (0,4) and not (0,0)
*April 22, 2010*

**college algebra**

f(x)=4x/x-2 what is the vertical asymptote I have a possible answer of x=2 am I on the right track
*April 22, 2010*

**math**

I'm having trouble simplifying two problems with exponents. Please help. Thanks. 1. [(-2)^4]^3 2. 10^7 . -1/10
*April 21, 2010*

**math**

I'm having trouble with 2 problems. Please help. Thanks.
*April 21, 2010*

**college**

if y=kx/square root of w find k when y=4 x=12 and w =4 I have an answer of 16/3 and I believe that the correct answer is 2/3 am I right.
*April 21, 2010*

**college algebra**

if f(x)=4x/x-2 what is f(3) possible answer would be f(3)=12 is this correct
*April 20, 2010*

**college algebra**

f(x)=4x/x-2 what is the vertical asymptote I have a possible answer of x=2
*April 20, 2010*

**college algebra**

if y=kx/square root of w find k when y=4 x=12 and w =4 I have an answer of 16/3 aia believe that the correct answer is 2/3 am I right.
*April 20, 2010*

**calculus**

simply the summation of (2/n)(2i/n)
*April 20, 2010*

**medical records**

How does accreditation affect the practical activities of record management in hospitals
*April 19, 2010*

**science**

25 ml sample of 0.150 m solution of aqueous trimethylamine is titrated with 0.100 M soultion of hcl. calculate the pH of the solution after 10.0ml,20 ml and 30.0 ml of acid have been added; pkb of (CH3)3 N =4.19?
*April 19, 2010*

**Math**

Multiply. Use the partial-products algorithm. 87 x 65 Not sure how to use the partial-product algorithm.
*April 18, 2010*

**algebra**

write each number in exponential notation 100= 10,000=
*April 7, 2010*

**Chemisty**

^ ^ ^ Chris is right! THANKS SO MUCH MAN!!!
*April 5, 2010*

**chemistry**

A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate the change in energy. The answer is 16 kJ, but I don't understand why. If a gas absorbs heat and does 29 kJ of work. Wouldn't they both be positive? Change in energy = q + w 45 kJ + 29 kJ = 74 kJ Why is the ...
*March 31, 2010*

**integrated algebra**

5-3(2b-3)= -4
*March 31, 2010*

**physics**

An object is thrown vertically into the air with an applied force of 145N. what is the initial acceleration of the object?
*March 30, 2010*

**math**

0.8125
*March 29, 2010*

**physics**

a 125Newton box is pulled east along a horizontal surface with a force of 60Newton acting at an angle of 42degrees. if the force of friction on the box is 15 newton, what is the acceleration?
*March 29, 2010*

**physics**

Physics force of friction question a 63kg water skier is pulled across a lake by a rope that exerts a force of 3.2x10^2 and makes an angle 17 degrees above the horizontal. if the coefficient between the skies and the lake is 0.27 at what rate will the skier accelerate?
*March 28, 2010*

**physics**

isn't vf 5.8
*March 28, 2010*

**physics**

Physics force of friction question a shuffle board disk is accelerated to a speed of 5.8m/s and released. if the coefficient of the kinetic friction between the disk and the concrete court is 0.3, how far does the disk go before it comes to a stop?The courts are 15.8meters long
*March 28, 2010*

**psychology**

So you answered my question to tell me not to post it twice that was an accident...heres my question i need some help please, dont tell me to post again because it was by accident. Which color arrangement wouldcreate the deepest senseof space? A. red,orange,blue B. Green ...
*March 28, 2010*

**psychology**

Which color arrangement wouldcreate the deepest senseof space? A. red,orange,blue B. Green violet, blue C.Yellow, orange,yellow-orange D. Violet, blue-violet, red-violet What are the double split complement colors for blue-green?
*March 28, 2010*

**Psychology**

Which color arrangement wouldcreate the deepest senseof space? A. red,orange,blue B. Green violet, blue C.Yellow, orange,yellow-orange D. Violet, blue-violet, red-violet What are the double split complement colors for blue-green?
*March 27, 2010*

**5th grade math**

3.14
*March 19, 2010*

**american history**

Francis Cabot Lowell led a group of businessmen who? A. built a centralized textile factory in massachusetts B. ended that market revolution C. received the first state charter for a bank D. cashed in so many bank notes that they led to a panic in 1837
*March 19, 2010*

**physics**

i thought T was the total time dont you have to subtract it by the time of the angle to find the time of the fall
*March 18, 2010*

**physics**

Need help with short projectile motion question a ball is thrown up off the roof of a school at an angle of 55 degrees from the horizontal and at a velocity of 25m/s. how long before it hits the ground if it land 95meters from the base of the building? at what horizontal and ...
*March 18, 2010*

**math**

A parabola with a vertex at (–1, –2) passes through the point (1,6). Using this information, what are the x-intercepts of this parabola? A) (1 – , 0) and (1 + , 0) B) (2, 0) C) (0, 0) and (–2, 0) D) (0, 0) how would i figure this out?
*March 17, 2010*

**math**

how would i do this quadratic word problem A local daycare centre charges $65 per day to care for a child. The daycare currently cares for 150 children per day. A survey shows that the enrollment in the daycare will increase by 10 children for each $5 decrease in daily fee, ...
*March 17, 2010*

**math**

sorry i forgot to write math
*March 17, 2010*

**samuel**

how would i do this quadratic word problem A local daycare centre charges $65 per day to care for a child. The daycare currently cares for 150 children per day. A survey shows that the enrollment in the daycare will increase by 10 children for each $5 decrease in daily fee, ...
*March 17, 2010*

**5th grade**

37.68
*March 17, 2010*

**5th grade**

About 3. So your anwser would be A.
*March 17, 2010*

**physics**

would the formula for solving for time be vyf-vyi/a
*March 16, 2010*

**physics**

Short projectile motion question a peron kicks a football from 39.6 meters from the goal posts. the kcik leaves the ground with a speed of 24.8m/s at an angle of 49.6 degrees. the goal post are 3.10 meters high determine the amount by which the kick clears the goal posts
*March 16, 2010*

**physics**

projectile motion question need help working through it an airplane travelling 1001meters above the ocean at 125km/h is going to drop a box of supplies to shipwrecked victims below. a) How many seconds before the plane is directly overhead should the box be dropped b) what is ...
*March 14, 2010*

**Social**

Ia Rush Limbaugh, as carried on WBEN radio in Buffalo is an example of network programming and is All things Considered", as carried by WBFO in Buffalo is an example of network programming as well
*March 14, 2010*

**physics**

Short projectile motion question A German rocket from the second world war had a range of 3000meters reaching a maximum height of 1000meters. Determine the rockets maximum velocity
*March 12, 2010*

**math**

peter bought a bag of candy. He gave away ten percent of the candy too his wife and the gave three pieces to meg. he gave one forth of what he had left to his friend joe and then ate half of the remaining 18 peaces of candy. How many pieces of candy were originally in the bag?
*March 11, 2010*

**grade 12 trig**

cot 17= 3.2709 what does tan of 73 equal
*March 11, 2010*

**calculus**

Find the direction of A= <-5,12> I did arctan (12/-5) and added 180 because x was negative and got 105.13 degrees. I missed the question on the test though. What did I do wrong?
*March 10, 2010*

**math**

4 people need to cross a brige but it is dark outside and they only have one flashlight and only 2 people can cross at one time. doris takes 10 minutes bob takes 5 minutes jack takes 2 minutes and annie takes 1 minute. how can thay get across in 17 minutes. someone has to go ...
*March 9, 2010*

**physics**

How do I go about in solving this? A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? ___ km (b) What is the satellite's acceleration? ___m/s2
*March 7, 2010*

**physics**

(how do I go about solving this, i know i need to conver 88days to secs and that would be 126,720. but I don't where to go from there, help please) What is the average linear speed of Mercury about the Sun? (The distance from the Sun to Mercury is 5.80 1010 meters. The ...
*March 7, 2010*

**phy sci **

hafe life
*March 5, 2010*

**physics**

can someone please take me step by step on this problem a swimers speed in still water is 1.35m/s if the current speed is 0.60m/s and the river is 106.68 meters wide. how long will it take to cross the river
*March 4, 2010*

**Physics.**

The figure below shows an arrangement of 15 identical disks that have been glued together in a rod-like shape of length L = 1.4500 m and (total) mass M = 135.000 g. The arrangement can rotate about a perpendicular axis through its central disk at point O. (a) What is the ...
*March 4, 2010*

**physics**

what do i do...
*March 4, 2010*

**physics**

can someone take me through this vector combination question please an airplane is observed to be flying at a speed of 600km/h. The planes nose points west. The winds velcoity is 40km/h 45degrees west of south. Find the air planes velocity relative to the ground.
*March 4, 2010*

**physics**

During a ski race, Kate uniformly accelerated at 3.15m/s^2 for 100meters. She then maintained this velocity for another 100m. she then uniformly decelerated at 6m/s^2 for 2 seconds. she accelerates back to her maximum velocity over the next 200meters in 16 seconds. she then ...
*March 4, 2010*

**physcis**

During a ski race, Kate uniformly accelerated at 3.15m/s^2 for 100meters. She then maintained this velocity for another 100m. she then uniformly decelerated at 6m/s^2 for 2 seconds. she accelerates back to her maximum velocity over the next 200meters in 16 seconds. she then ...
*March 4, 2010*

**physics**

Tried using a free fall set up with no luck. Things like (-9.8)(10.1)+43.3
*March 3, 2010*

**physics**

A balloonist, riding in the basket of a hot air balloon that is rising vertically with a constant velocity of 10.1 m/s, releases a sandbag when the balloon is 43.4 m above the ground. Neglecting air resistance, what is the bag's speed when it hits the ground? Assume g = 9....
*March 3, 2010*

**physics**

That reply was meant for a different question.
*March 3, 2010*

**physics**

I tried using free fall equations with no luck. I guess this isnt a free fall problem?
*March 3, 2010*

**physics**

need help decomposing theses vectors to x and y 52.9 meters at 19 degrees rectangular cor-ordinate system
*March 3, 2010*

**physics**

do i have to add anything like north of east since it did not give me a direction on the questions
*March 3, 2010*

**physics**

i got an answer of 50meters at 13degrees
*March 3, 2010*

**physics**

need help combining these vectors (if you can please show me a step by step guide of combining these two. Thank you 56m at 296 degrees, then 83m 152 degrees
*March 3, 2010*

**physics**

need help combining these vectors 56m at 296 degrees, then 83m 152 degrees
*March 3, 2010*

**physics**

finding the bearing of a vector? when i am giving a vector like 56 m at 296 degrees do i have to find a bearing of 296 degrees or is it only when i get something like 296 degrees south of east
*March 3, 2010*

**physics**

need a step by step process of combining this question into one vector: 56 NEWTONS at 296 degrees, then 83 newtons at 152 degrees
*March 2, 2010*

**Physics**

What is the difference in shape on a graph 70 degrees south of east and 70 degrees east of south?
*March 2, 2010*

**chemistry**

assume that you have a solution that is 5% (mol) acetone and 95% (mol) water. determine the molarity of this solution. how would you prepare a solution of this concentration in the lab? density of acetone=0.79 g/ml
*March 2, 2010*

**physics**

i need to determien the displa
*March 2, 2010*

**physics**

need help with doing this combining vector question A jogger runs with a velocity of 6km/h 25 degrees north west for 35 minutes and then changes direction , jogging for 20 minutes at 4.5km/h 65 degrees east of north. using a vector diagram determine the joggers total ...
*March 2, 2010*

**physics**

sorry i meant 70 degrees north of east and 70 degrees east of north
*March 1, 2010*

**physics**

what is the difference in shape on a graph between 70 degrees north of east and 70 degrees east of south
*March 1, 2010*

**physics**

need help with physcis vector problem Using combining vectors to find displacement problem(BEST answer)? tourist on a jet ski move 1.2km 55 degrees North of E and then 3.15km 70 degrees south of east. determine the jet ski's displacement.
*March 1, 2010*