Thursday

November 26, 2015
Total # Posts: 1,957

**Chemistry**

How do I find the radius of a sulfide ion?
*September 24, 2010*

**Chemistry**

I used coulomb's law to find the force of attraction between the ionic atoms in BeS and BeO. For BeS, F = -6.85x10^29 J/m For BeO, F = -9.078x10^29 J/m Which has the stronger force of attraction? BeO? What does the "-" sign mean?
*September 23, 2010*

**chemistry**

Is it true that the greater difference in electronegativity in an ionic compound, the greater attraction between the elements in the compound?
*September 23, 2010*

**Chemistry**

I am comparing the ions BeS and BeO. BeS... d=229 pm Force of attraction = -6.856x10^29 J/m BeO... d=199 pm Force of attraction = -9.078x10^29 J/m I used Coulumb's to find this. Can you explain this?... the reasoning why BeS has a greater attraction?
*September 23, 2010*

**Chemistry**

How do I find the radium of the sulfide ion in BeS? The radius of Be is 59 pm. I am also given the force between them.
*September 22, 2010*

**physics**

An athlete executing a long jump leaves the ground at a 20° angle and travels 7.80 m. (a) What was the takeoff speed? 1._____ m/s (b) If this speed were increased by just 5.0%, how much longer would the jump be? 2.______ m
*September 21, 2010*

**physics**

A delivery truck travels 20 blocks south, 24 blocks west and 25 blocks north. What is its final displacement from the origin? Assume the blocks are equal length. Need magnitude of blocks, and direction(counterclockwise from east is positive)
*September 21, 2010*

**chemistry**

We add excess NaCl solution (58.44 g/mol) to 64 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid AgCl. When it has been dried and weighed, the mass of AgCl (143.32 g/mol) is found to be 1.91 grams. What is the molarity of the original AgNO3 ...
*September 20, 2010*

**Music**

ok, well it says what it is but it doesnt say whether it is classical, folk, or popular...so i have no idea?
*September 19, 2010*

**Music**

I'm learning about Asian music and i have 7 terms, and i have to group them into either folk, classical or popular. The 7 terms are khaen, tai thu, metallophone, piphat, ramayana, Lam sing, and gamelan. Which terms fall into each of the 3 groups. Any help is appreciated ...
*September 19, 2010*

**Music**

I'm learning about Asian music and i have 7 terms, and i have to group them into either folk, classical or popular. The 7 terms are khaen, tai thu, metallophone, piphat, ramayana, Lam sing, and gamelan. Which terms fall into each of the 3 groups. Any help is appreciated ...
*September 19, 2010*

**Music**

I'm learning about Asian music and i have 7 terms, and i have to group them into either folk, classical or popular. The 7 terms are khaen, tai thu, metallophone, piphat, ramayana, Lam sing, and gamelan. Which terms fall into each of the 3 groups. Any help is appreciated ...
*September 19, 2010*

**math**

2n-8=3n+3
*September 15, 2010*

**Math**

2n+5+7n-8=15
*September 15, 2010*

**accounting**

credit revenue $55,000 Debit A/R $8,000 Debit Cash $47,000 Debit Cash $3,000 Credit Unearned Revenue $3,000 Debit Expense Account $7,000 Credit A/P $7,000
*September 15, 2010*

**Physics**

A 3.0-kg block is at rest on a horizontal floor. If you push horizontally on the 3.0-kg block with a force of 12.0N it just starts to move. What is the coefficient of static friction?
*September 15, 2010*

**math**

Just divide??
*September 14, 2010*

**math**

I am trying to find a pattern in these numbers. I have looked for what feels like hours, and can't find it. -3,-9,-14,-42,-47,-141
*September 13, 2010*

**Writeacher-geography **

i think im doing the same homework as anika i was just wondering where Dubai and Switzerland came on the top 20 cities in the world of 2005. thankyou
*September 11, 2010*

**chemistry**

Naturally occuring chlorine gas has 3 isotopes 35cl-35cl, 35cl-37cl , 37cl-37cl a) mass of one molecule in terms of amu. b) mass of one molecule in terms of grams. c) mass of one mole in terms of grams. d) Naturally occuring Cl has 75% 35cl and 25% 37cl, calculate the mass of ...
*September 6, 2010*

**math**

find D from the formula C= pie D WHEN pie= 3.142 and c= 27
*September 6, 2010*

**chemistry**

Naturally occuring chlorine gas has 3 isotopes 35cl-35cl, 35cl-37cl , 37cl-37cl a) mass of one molecule in terms of amu. b) mass of one molecule in terms of grams. c) mass of one mole in terms of grams. d) Naturally occuring Cl has 75% 35cl and 25% 37cl, calculate the mass of ...
*September 6, 2010*

**calculus**

Lim sin2h sin3h / h^2 h-->0 how would you do this ?? i got 6 as the answer, just want to make sure it's right. and i couldn't get this one (use theorem 2) lim tanx/x x-->0 and also this one (use squeeze theorem to evaluate the limit) lim (x-1)sin Pi/x-1 x-->1
*September 6, 2010*

**calculus**

Evaluate the limit or state that it does not exist. lim Root(6+x)-Root(6-x)/x x->0 i kept getting zero which ever way i tried to solve it.. help plz.
*September 1, 2010*

**Math**

3=43
*August 30, 2010*

**college physical science**

Mass/Density = Volume _11.4_g_ = v 7.87g/cm3 1.45cm3 = v
*August 29, 2010*

**Calculus**

lim x-->0+ f(x), where f(x)= x ln x values for x are 1,0.5,0.1,0.05,0.01,0.005,0.001 when i plugged in 1 i got 0 then -.34657 then -.23025 ................... leading up to -0.00690 what is the value of the limit is it approaching 0?? and if it is approaching 0 then why is ...
*August 29, 2010*

**calculus**

lim t-->0 h(t), where h(t)= cos(t)-1/t^2. for the table values t is +/- .002 , .0001 , .00005 , .00001 what do you guys get for the value of h(t) and limit?? when i plugged in .002 i got -.499999975 when i plugged in .0001 i got -.5 when i plugged in .00005 i got -.5 when i...
*August 29, 2010*

**spanish 1**

1-7 What would you say in the following situations? 1. You are dancing with a friend and accidentally step on his/her toe. 2. A friend gives you a birthday present. What do you say to him/her? How does he/she respond? 3. You want to pass by some people who are blocking the ...
*August 26, 2010*

**spanish**

in Latin America, to several friends Your response: ellos Points earned: 0 out of 1 what pronoun would you use??
*August 26, 2010*

**spanish**

and then from this i got 2 correct Modelo: You want to greet Mrs. Gutiérrez. It is 10:00 A.M. Buenos días, señora Gutiérrez. 1. You want to greet Mr. Gutiérrez. It is 2:00 P.M. Your response: Buenos días, señor Gutiérrez...
*August 26, 2010*

**spanish 1**

i got the first one right need help with other 3, i don't know if it's the grammar or what but the online website is not accepting my answers so help please.
*August 26, 2010*

**spanish 1**

Can any one help me answer these questions, i am having trouble because i haven't received my book yet. Modelo: Elena / Colorado ¿De dónde es Elena? Es de Colorado. 1. la profesora Guzmán / España 2. usted / Texas 3. tú / Arizona 4. ellas...
*August 26, 2010*

**physics**

A car starts from rest with a velocity given by v=kt^3 where k is a constant. The expression for the distance traveld by the car from its position at t=0 is: a] 3kt^3 b] kt^3 c] 6kt d] kt^4/4
*August 24, 2010*

**physics**

A first object is thrown vertically upward with some initial speed and some initial height above the ground. Simultaneously, a second object is thrown straight down with the same initial speed and same initial height above the ground. Before the second object reaches the ...
*August 24, 2010*

**6th grade English**

the shiny red car and the bicycle. I have to tell whether the sentence part can be used as a subject or a predicate then use the part in a sentence.
*August 23, 2010*

**Chemistry**

A solution is made by diluting 18.2 g glucose (C6H12O6) in 0.150 kg water. What is the mass percentage of solute in this solution?
*August 3, 2010*

**Pythagorean Theorem**

help
*July 15, 2010*

**algebra**

Of the 240 campers at a summer camp, 5/6 could swim. If 1/3 of the campers took climbing lessons, what was the least possible number of campers taking climbing lessons who could swim? a) 20 b) 40 c) 80 d) 120 e) 200
*July 11, 2010*

**grammar**

Could you please check the grammer in these sentences? Thanks. It was clearly her, right from the start. These are they, if I'm not mistaken. It always appeared to be them whenever there was trouble. The penalty against them brought coach Henson and I great satisfaction. ...
*July 1, 2010*

**chemistry**

a mixture of gases at a total pressure of 95kPa contains carbon dioxide, oxygen, and nitrogen. The partial pressure of the carbon dioxide is 48kPa and the partial pressure of the nitrogen is 24kPa. What is the partial pressure of the oxygen?
*June 23, 2010*

**chemistry equilibrium**

In a 0.10 M solution of glutaric acid, HO2C(CH2)3CO2H (K1 = 4.6 ´ 10-5, K2 = 3.9 ´ 10-6), the species present in the next to highest concentration is A. H3O+(aq). B. HO2C(CH2)3CO2H(aq). C. HO2C(CH2)3COO-(aq). D. -O2C(CH2)3COO-(aq). E. OH-(aq).
*June 20, 2010*

**calculus**

Find a vector perpendicular to the plane that contains the points A(1,2,3), B(3,2,1), and C(-1,2,-3) Where do I start to find it?
*June 17, 2010*

**momemtum ?**

I know that momemtum (p) is equal to mass times velocity, but I am not sure how to get the velocity.
*June 16, 2010*

**momemtum ?**

A ball of mass 0.150 kg is dropped from rest to a height of 0.125 m. It rebounds from the floor to reach a height of 0.960m. What impulse was given by the floor? please help/explain. Thanks!
*June 16, 2010*

**Math**

Which one is smaller 5.8x10^-3 or 4.5x10^-3
*June 13, 2010*

**STATISTICS**

There are 10 colored balls in a box ( 5 red, 3 blue, 2 green ). What is the probability of picking out a red ball and then a blue ball ( If I do not replace the red ball )? 1/6 1/2 3/20 4/5
*June 7, 2010*

**STATISTICS**

Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information.
*June 7, 2010*

**STATISTICS**

ONE of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. The different colors of the eyes of your classmates. The number of students in your school. The height of all the people in your neighborhood.
*June 7, 2010*

**social studies**

Should Nations pursue goals of international cooperation to ensure security
*June 7, 2010*

**calculus**

How do you find the limit of: 1(1 - (1/k))/2! as k increased with no bound? I know the answer is 1/2! But how do you get there? Are you supposed to divide both top and bottom by k?
*June 7, 2010*

**trig**

Regarding the trigonometric series, Why does cos start with a 1 and why are the powers of x even numbers Also for sin, why does sin start with an x and why are the powers odd?
*June 6, 2010*

**STATISTICS**

The area under a normal curve distribution is Equal to 100 almost equal to 1 equal to 1 equal to .5
*June 3, 2010*

**STATISTICS**

What percentage of the general U.S. population has bachelor’s degrees? Suppose that the Statistical Abstract of the United States, 120th Edition, gives the following percentage of bachelor’s degrees by state. For convenience, the data are sorted in increasing order. ...
*June 3, 2010*

**STATISTICS**

Find the sample standard deviation s for the following sample data. Round your answer to the nearest hundredth. x: 23 20 11 33 27
*June 3, 2010*

**STATISTICS**

I HAVE 150 FOR MY ANSWER
*June 3, 2010*

**STATISTICS**

If I go into an ice cream parlor, and I have the choice of having one of 10 different flavors , with one of 5 different toppings and one of 3 different types of cones, How many times can I come back to this place and get a different ice cream cone combination
*June 3, 2010*

**STATISTICS**

i HAVE AN ANSWER OF 90
*June 3, 2010*

**STATISTICS**

A Statistics teacher has the following test scores : 93, 72, 80, 95, 90, 70, 91, 85, 86, 100 What is the median test score of these grades ?
*June 3, 2010*

**STATISTICS**

I HAVE AN ANSWER OF 7 WHICH WOULD BE 70
*June 3, 2010*

**STATISTICS**

For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?
*June 3, 2010*

**STATISTICS**

The Sarasota Police department collected data on the number of car accidents ( X ) that occur each day on a certain stretch of route 41. From this data, they derived the probability distribution shown in the table below. X P(X) 0 0.80 1 0.15 2 0.05 What is the expected mean (...
*June 2, 2010*

**STATISTICS**

There are 10 colored balls in a box ( 5 red, 3 blue, 2 green ). What is the probability of picking out a red ball and then a blue ball ( If I do not replace the red ball
*June 2, 2010*

**STATISTICS**

What type of distribution is described by the following information? Mean = 56 Median = 58.1 Mode = 63
*June 2, 2010*

**STATISTICS**

What type of distribution is described by the following information? Mean = 56 Median = 58.1 Mode = 63
*June 2, 2010*

**Statistics**

For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?
*June 1, 2010*

**Chemistry**

A weather balloon at Earth's surface has a volume of 4.00 L at 304 K and 755 mm Hg.? If the balloon is released and the volume reaches 4.08 L at 728 mm Hg, what is the temperature? What gas law do you use?
*May 21, 2010*

**Chem**

Can't figure this one out....how do you balance MnO4- + SO3-2 ====> SO4-2 + Mn+2?
*May 21, 2010*

**chemistry**

The specific heat of copper is .4 joules/gram degrees Celsius. How much heat is needed to change the temperature of a 30 gram sample of copper from 20 degrees to 60 degrees? I just need to know how to set up the problem and solve it.
*May 19, 2010*

**Organic Chemistry**

I am suppose to calculate the theoretical amount (volume) of 3M sodium hydroxide needed to convert 1.5 g of benzoic acid to its salt. Also calculate the volume of 12M HCl needed to convert the sodium benzoate back to benzoic acid. how do I go about doing this? Thanks
*May 18, 2010*

**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*