Saturday

April 30, 2016
Total # Posts: 1,021

**chemistry**

23) The equilibrium constant for the gas phase reaction 2NH3 (g) <-> N2 (g) + 3H2 (g) is Keq = 230 at 300 °C. At equilibrium, __________. A) reactants predominate B) products predominate C) only products are present D) roughly equal amounts of products and reactants ...
*November 18, 2010*

**chemistry**

Iodine-131 has a half-life of 8 days. How many grams of a 12 g sample will remain at the end of 40 days? how do i solve this? i thought it was 12^40=1.5 but thats wrong...
*November 18, 2010*

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
*November 17, 2010*

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
*November 17, 2010*

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...
*November 17, 2010*

**Physics**

A ball is thrown upwards on the moon with an initial speed of 35m/s. Calculate (a)the time taken to reach the maximum height. (b) the maximum height reached by the ball (c) Its velocity 3seconds after it has been thrown. (g=1.6ms^2)
*November 16, 2010*

**Physics**

A stone is thrown vertically upwards from the top of a tower 50.0m high with an intial velocity of 20.0m/s. (a) whats the maximum height the stone reaches? (b) Whats the time it takes to reach the maximim height? (c) What is the total distance it covers?
*November 16, 2010*

**8th grade science**

1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?
*November 15, 2010*

**8th grade science**

1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?
*November 15, 2010*

**social studies**

why does al qaeda exist?
*November 12, 2010*

**social studies**

What Does Al-Qaeda actually want to achieve
*November 12, 2010*

**social studies**

thank you
*November 12, 2010*

**social studies**

How do terrorist groups use the media to portray their message
*November 12, 2010*

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
*November 11, 2010*

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
*November 11, 2010*

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it
*November 11, 2010*

**Chemistry**

For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH Oops theres the question...
*November 10, 2010*

**Chemistry**

The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not getting. I would appreciate it if you could do this question so I can use as a guide for other similar questions.
*November 10, 2010*

**Chemistry**

For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not...
*November 10, 2010*

**Chemistry**

I keep calculating the square root of 3RT/M, and am not worrying about the temperature. I keep using 238 and 235 as my M when I do calculate it for both isotopes. Then I end up getting 1.00 as my final answer. That can't possibly be correct, can it? The question was: The ...
*November 10, 2010*

**chemistry**

I got the square root of 238/235 is 1, and I know that R mutiplied by 3 is 24.9, but I'm stuck right there.
*November 9, 2010*

**chemistry**

The two isotopes of uranium, 238U and 235U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF to that of 235UF6 at constant temperature?
*November 9, 2010*

**Chemistry**

Calculate the change in heat when 3.05g of water vapor (steam) at 100.0 degrees celsius condenses to liquid water and then cools to 18.50 degrees celsius.
*November 8, 2010*

**calculus**

Find the differential dy of the given function: y=xcosx would this just be dy=(cosx-xsinx)dx
*November 8, 2010*

**physics**

A bucket of mass 2.20 kg is whirled in a vertical circle of radius 1.15 m. At the lowest point of its motion the tension in the rope supporting the bucket is 28.0 N. a) Find the speed of the bucket. b)How fast must the bucket move at the top of the circle so that the rope does...
*November 4, 2010*

**Maths B**

Hi, i was just wondering if you could help me with how to work out this question, as i have attempted and get a bit confused at the end. here it is: A cylinder is inside a sphere- the sphere has a radius of R. What is the maximum volume of the cylinder? Thanks - really ...
*November 2, 2010*

**Calculus**

Do points of inflection have to be defined in the original function?
*October 30, 2010*

**College Algebra URGENT**

f(x)=1/(x+4) g(x)1/(6x+4) what is f(composed)g(x) if x does not equal -4/6 please help me
*October 29, 2010*

**english**

What format is used when writing a book report
*October 27, 2010*

**chemistry**

Determine the ratio of cations to anions for the following ionic compounds a. potassium, a salt substance b. calcium floride, used in steel industry c. aluminum oxide, known as corundum in the crystalline form d. calcium oxide, used to remove sulfur dioxide from power plant ...
*October 24, 2010*

**physics**

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
*October 21, 2010*

**physics**

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
*October 21, 2010*

**Physics**

A jetliner is moving at a speed of 270 m/s. The vertical component of the plane's velocity is 39.8 m/s. Determine the magnitude of the horizontal component of the plane's velocity. Can someone please solve this?
*October 20, 2010*

**chem**

i understand most of the problem but where did the 0.84 M come from? a drug was injected into your body with a 2.00 M concentration. what would be its concentration after 0.010 seconds if k = 875 ^ -1 1st order reaction! ln [ A ]t = - (875 ^ -1) (0.010 SEC) + ln (2.00) = - 0....
*October 19, 2010*

**math 2nd grade**

How do you figure this out please help my daughters first grade teacher gave this homework and I don't have a clue
*October 17, 2010*

**8th grade science**

why are neuclar waste products a problem?
*October 11, 2010*

**physics**

A 715 kg object is lifted from the surface of the earth to a height of 880 kg above the surface of the earth. Calculate the increase in gravitational potential energy using the exact expression and compare it with the approximate expression using g=9.81. Give the magnitude of ...
*October 8, 2010*

**management**

I have ths secton to, I just don't know where to start. My learning teams, needs it tonite. And I am totally lost.
*September 30, 2010*

**Physics**

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...
*September 28, 2010*

**Physics**

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...
*September 28, 2010*

**chemistry**

thank you
*September 22, 2010*

**chemistry**

how do you change Density= mass/volume (D=m/v) to solve v or m?
*September 22, 2010*

**english**

Could you explain social realism please?
*September 21, 2010*

**english**

How is "The Handsomest Drowned Man in the World" an example of the author using social realism?
*September 21, 2010*

**physics**

A hockey puck moving due east with speed 1.00 m/s collides with an identical puck moving 40 degrees south of west with speed 2.00 m/s. After they collide, the first puck is moving south with speed 1.50 m/s. What is the direction and speed of the second puck?
*September 16, 2010*

**Physics**

A particle moving initially at 4 m/s in the positive x direction is given an acceleration of 3 m/s^2 in the positive y direction for 2 seconds. What is the magnitude and direction of the particle's velocity after 2 seconds? If the particle was located at the origin when ...
*September 15, 2010*

**chem**

if i have density and the mass, how do i find the valume?
*September 10, 2010*

**chem**

if i have density and the mass, how do i find the valume?
*September 10, 2010*

**History**

In what ways does the Magna Carta still impact law?
*August 30, 2010*

**chemistry**

8.5 to get the answer use a simple math equation where 21x= 85*2.1. Resulting in 21x= 178.5. then solve that equation and get the answer 8.5...
*August 30, 2010*

**english**

is the vowel sound in the word cat a) a front low short sound b) front low long sound im guessing A because how CAT is spelt "kaet" ae is a short vowel
*August 24, 2010*

**english phonetics**

Hello I was wondering if my answers for my phonetics assignment were correct... Articulatory - deal with manner and place of articulation of sounds pronunciation problem - the student pronounces "pale" instead of "fail" MANNER AND PLACE OF ARTICULATION? ...
*August 23, 2010*

**english**

16.A velar consonant is produced when … a the tip of the tongue touches behind the alveolar ridge. b the tip and blade of the tongue touches the hard palate. c the back of the tongue touches the hard palate. d the back of the tongue touches the soft palate or velum. 17....
*August 20, 2010*

**english**

01.Which area of Phonetics deals with manner and place of articulation of sounds? a Acoustic b Morphology c Articulatory d Auditory 02.Select the statement that is incorrect. a Phonology deals with the individual sounds of the language, word and sentence stress, intonation ...
*August 20, 2010*

**english**

01.Which area of Phonetics deals with manner and place of articulation of sounds? None Acoustic Morphology Articulatory Auditory 02.Select the statement that is incorrect. None Phonology deals with the individual sounds of the language, word and sentence stress, intonation ...
*August 20, 2010*

**algebra**

convert to decimal notation 8.87*10^7
*August 19, 2010*

**algebra**

If you are looking at a graph of a quadratic equation, how do you determine where the solutions are?
*August 13, 2010*

**algebra**

A chemist mixes some 20% acid solution with pure 100% acid to increase the concentration. How much pure acid and acid solution should be mixed to form 100 milliliters of 40% acid solution?
*August 12, 2010*

**Math**

The area of a triangle is 75 sq in. Calculate the possible angles formed by the triangle's 12-inch and 15-inch side.
*August 11, 2010*

**Algebra**

I did most of the equation but i cannot figure out how to change my anser into a fraction or form that I can use for my answer the last part is 3000/90???
*August 10, 2010*

**wo9rld history**

what dose a 16 making pictures of a bomb and threating a school have in comman with world history what is the text to text to that
*August 3, 2010*

**algebra 2**

The student council is picking up litter along the highway. When they are halfway done, they have collected at least 5 bags of liter. If their rate of collection remains constant, what is the total number of bags they will have when they are finished?
*July 27, 2010*

**algebra**

To determine the number of deer in a game preserve, a conservationist catches 523 deer tages them and let's them loose. Later 468 deer are caught, 234 of them are tagged. How many deer are in the preserve?
*July 18, 2010*

**algebra**

Simply by removing factor 1 p^2-36/p^2-12p+36
*July 18, 2010*

**algebra**

Thank you
*July 18, 2010*

**algebra**

Simply by removing factors of 1 q^2-25/(q+5)^2
*July 18, 2010*

**PSYCHOLOGY**

social learning
*July 17, 2010*

**Maths**

If g(x)>0 for all real values of x, which of the following could be function g? a) g(x)= x+1 b) g(x)=x-1 c) g(x)= x^2+1 d) g(x) = x^2-1 e) g(x) = x^3 + 1
*July 12, 2010*

**physics**

diagrams help, i had these almost exactly drawn out, but i do not know how to create the equations to solve for the unknowns. thanks
*June 25, 2010*

**physics**

A meter stick is pivoted at its 50-cm mark but does not balance because of non-uniformities in its material that cause its center of gravity to be displaced from its geometrical center. However, when masses of 150 and 200 grams are placed at the 10-cm and 75-cm marks ...
*June 25, 2010*

**8th grade**

How Do you do Factorising? Thankyou -Jess
*June 17, 2010*

**chem**

Calculate the boiling point elevation of a solution containing 50.0 g of glucose dissolved in 500.0 g of water? We just started learning about this and i dont get it!
*May 25, 2010*

**geometry**

the perimeter of a triangle is 59 inches. the longest side is 11 inches longer than the medium side, and the medium side is 3 inches more than the shortest side. Find the length of each side.
*May 4, 2010*

**chemistry-science**

A 500 ml buffer solution contains .2M Acetic acid and .3M sodium acetate. Find the pH of the buffer solution after adding 20 ml of 1M NaOH, what is the pH? (pka = 4.74)
*April 30, 2010*

**Math**

I am rubbish at maths!!!!! any suggestions to help myself get better?
*April 26, 2010*

**Math**

what must be added to 8/3 to make 2 5/6
*April 26, 2010*

**algebra**

was supposed to be an x after the 0.3 sorry
*April 8, 2010*

**algebra**

Solve 0.3+4<=1.1x-9 Thank you
*April 8, 2010*

**algebra**

Are the pairs parallel, perpendicular, or neither 3x+4y=1 4x+3y=8 I say they are perpendicular
*April 7, 2010*

**Biology - Hormones**

What 3 steroid hormones and involved in controlling reproductive function in both non pregnant women and in men
*April 6, 2010*

**Math 132**

There are 7 girls and 6 boys in a class. Suppose five children are randomly chosen to decorate the game room. Given that at least one boy is chosen, what is the probability that exactly two boys are chosen?
*April 5, 2010*

**Biology - Hormones**

Name 3 steroid hormones involved in controlling the reproductive function of both non pregnant women and men ty
*April 5, 2010*

**physics**

how would i solve this? A sled is dragged along a horizontal path at a constant speed of 1.5 m/s by a rope that is inclined at an angle of 30.0° with respect to the horizontal (the figure below). The total weight of the sled is 470 N. The tension in the rope is 240 N. How ...
*April 4, 2010*

**physics**

i got 6.075E12 for the meteor and 588,700 for the car, but both answers are still wrong.
*April 4, 2010*

**physics**

how do i go about in solving this? A helium atom (mass 4.0 u) moving at 596 m/s to the right collides with an oxygen molecule (mass 32 u) moving in the same direction at 402 m/s. After the collision, the oxygen molecule moves at 445 m/s to the right. What is the velocity of ...
*April 4, 2010*

**algebra**

Solve tne compound inequality 4x+2>= -22 or 7x+2>= -19 Thank you
*April 4, 2010*

**algebra**

Could you please help me solve. 3x+10>=7 and 2x-14>=-8 >= means greater than equal then thank you
*April 4, 2010*

**algebra**

Solve by the elimination method 0.3x-0.2y=4 0.4x+0.5y= - 55/17 Thank you
*April 4, 2010*

**algebra**

solve 2y-2<6y-3 Thank you
*April 3, 2010*

**algebra**

Determine whether the ordered pair is a soultion of the inequality. (8,18);7y-8x>3 I would have to say no? Thank you
*April 3, 2010*

**physics**

The prong of a tuning fork moves back and forth when it is set into vibration. The distance the prong moves between its extreme positions is 2.24 mm. If the frequency of the tuning fork is 440.7 Hz, what are the maximum velocity and the maximum acceleration of the prong? ...
*March 31, 2010*

**chemistry**

calculate the concentration of each solutions: 3 moles of solute dissolved in 2 liter of solution 6 moles of solute dissolved on 9 liters of solution 4 moles of solute dissolved in 3 liters of solution
*March 29, 2010*

**algebra**

Find an equation of the line having the given slope and the given point. m=0 (o,-4) would it be y=-4?
*March 21, 2010*

**algebra**

Find the slope and y-intercept, write fractional answer in lowest terms. 2y+9x+6=19+9x
*March 21, 2010*

**physics**

An 7.95 g bullet is fired horizontally into a 9.03 kg block of wood on an air table and is embedded in it. After the collision, the block and bullet slide along the frictionless surface together with a speed of 11.6 cm/s. What was the initial speed of the bullet?
*March 20, 2010*

**history**

Explain the policy of engagement
*March 19, 2010*

**social studies**

who wrote the senecafalls declaration? when and why
*March 15, 2010*

**chemistry**

assuming x=1, how much CuSO4.5H20 would you need to prepare 6 grams of copper ammine complex?
*March 15, 2010*

**Physics**

An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850Kg traveling initially at a speed of 43.0 km/h in a distance equal to the diameter of a dime, which is 1.8cm ?
*March 14, 2010*

**chemistry**

1.2 mol of CH3OH(g) are injected into a 2.0 L container and the following equilibrium becomes established. 2H2(g) + CO(g) <=====> CH3OH(g) + 92 kJ If at equilibrium 1.0 mol of CH3OH is still in the container the Ke must be which of the following? a. 25 d. 12.5 b. 125 e. ...
*March 12, 2010*