Sunday

September 25, 2016
Total # Posts: 537

**CHEMISTRY HELP**

DrBob222

*September 24, 2016*

**CHEMISTRY HELP**

The mass of NH3 is 8.5 grams And the number of moles of NH3 that was formed was 5 mol (n) Any help? :)

*September 24, 2016*

**CHEMISTRY HELP**

Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???

*September 24, 2016*

**Chemistry (Help!)**

Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???

*September 24, 2016*

**differential calculus**

A bulldozer costs $120,000 and each year it depreciates 8% of its original value. Find a formula(equation) for the value V of the bulldozer after t years.

*September 13, 2016*

**Biochemistry **

An enzyme-catalyzed reaction was carried out in a 0.2M �Tris� buffer, pH 7.8. As a result of the reaction, 0.03 mole/liter of H+ was produced. (pKa of Tris =8.1) (a) What was the ratio of Tris+ (conjugate acid) / Triso (Conjugate base) at the start of the ...

*June 26, 2016*

**PHYSICS**

a mass of 3kg rests on smooth horizontal table connected by a light string passion over a smooth pulley at the edge of the table to another mass of 2kg hanging vertically. when the system is released from rest with what acceleration do the masses move and what is the tension ...

*June 21, 2016*

**MATH**

My ones digit is 1.My tens digit is 2 ore than my ones digit.My thousands digit is the difference when my tens digit is subtracted from my hundreds digit.what number am I?

*June 20, 2016*

**math**

write the largest 4-digit number using the digits 9 and 8.Use each digit twice

*June 20, 2016*

**PHYSICS**

A stone is dropped from the top of a cliff and one second latter a second stone is thrown vertically downward with a velocity of 20m/s. How far below the top of the cliff will the stone overtake the first?

*May 29, 2016*

**PHYSICS**

A football is kicked from the ground at an angle 30degree above the horizontal with an initial speed 18m/s and directly towards the goalkeeper. If the goal line is a horizontal distance 25m away calculate the vertical height at which the ball crosses the goal line if not ...

*May 29, 2016*

**PHYSICS**

A ball is dropped onto the floor from a height of 20m. It rebounds to a height of 15m. If the ball was in contact with the floor for 0.01sec what was its average acceleration during the contact take g=10m/s

*May 28, 2016*

**PHYSICS**

A player kicks a ball at an angle of 37degree with the horizontal and with an initial speed of of 48ft/s. A second player standing at a distance of 100ft from the first in the direction of the kick starts running to meet the ball at the instant it is kicked. How fast must he ...

*May 28, 2016*

**chemistry**

How many milliters of a 6.ooM HCl solution are required to react with 21.0 grams of Mg? I'm so confused. I know how to get the Molar mass of Mg and HCl but, does that even matter here?

*May 6, 2016*

**math**

according to a map the distance between hilltop and valleyfloor is 1 1/4 inches. if the map uses a scale of 1/4 inch to represent 1 mile inches what is the actual distance in mile from hilltop and valleyfloor?

*April 24, 2016*

**math !**

1.65m is the right answer

*March 23, 2016*

**Math**

(2xy^2+16x^2y-20xy+8) / (4xy)

*March 7, 2016*

**math**

the model of a car is 4 1/8 inches wide. is three inches ok the model represents five feet what is the actual width of the car

*February 1, 2016*

**math**

what is 5(-4x+2)+3(5x-2)

*January 22, 2016*

**Language Arts**

Yep I finished my quick check and it’s A

*January 20, 2016*

**Language Arts**

Which of the following citations from The Watsons Go to Birmingham---1963 illustrates how the setting affects Byron? A. The way Byron kept his head down and was smiling and saying “Yes, ma’am” this and “No, ma’am” that, it looked like he had ...

*January 20, 2016*

**Physics**

A solid is completely submerged in a particular liquid and floats at a constant level.when the temperature of the liquid in the solid is raised, the liquid expands more than the solid. will this make the solid rise upward remain floating or sink explained

*January 19, 2016*

**Math**

Leah and Sam were playing a game with two dice. They took turns rolling the dice and finding the products of the numbers rolled. To make the game fair, if Leah rolls a certain product she gets 2 points. If Sam rolls a certain product, he gets 3 points. What might the products ...

*January 12, 2016*

**Science:Biology**

What are some unusual characteristics of food webs in agroecosystems?

*January 5, 2016*

**Ecology*Urgent***

Why is Biochar an efficient way to store carbon? *Biochar is basically rich soil with charcoal*

*January 5, 2016*

**physics**

What are the speed and acceleration (increase/decrease or remain constant) of a ball rolling down a a) straight hill, b) concave hill c) convex hill Can someone explain why they are, not just the answers?

*December 9, 2015*

**Algebra**

(11*5)+6=$

*November 30, 2015*

**Geometry **

a triangle has an area of 35 square inches, and its base is 3 inches more than it's height. Find the base and height of the trianlge

*November 21, 2015*

**physics**

the following point charges are placed on the x-axis: +2.0μC at x=20cm,-3.0μC at x=30cm and -4.0μC at x=40cm. What is the potential at x=0?

*November 19, 2015*

**physics**

two point charges +q and -q are separated by a distance d. aside from infinity, where else is the potential due to these two charges 0?

*November 19, 2015*

**chemistry**

at 25 celcius, how many dissociated OH ions are there in 8.0x10^-1 L of aqueous solution with pH 4.73?

*November 16, 2015*

**physics**

A truck accelerates uniformly from rest to 21.5m/s in 5.7sec along a level stretch of road. Determine the average power required to accelerate the truck for the following values of the weight (ignore friction) a) 1.00x10^4 N b) 1.45x10^4 N I used constant acceleration equation...

*October 26, 2015*

**Biology**

The LEPR gene that encodes for the leptin receptor protein is approximately 23 kilo base pairs long. The receptor protein consists of 896 amino acids. A man has a mutation in an LEPR allele. Analysis of his DNA sequence for this lepr allele shows that there is a 5' GTA to ...

*October 26, 2015*

**Physics**

I'm guessing the answer sheet has some mistake? It says the height is 9.6m , which I can't seem to figure out how they got that number! :s

*October 25, 2015*

**Physics**

Skier A of mass 71kg slides down a slope and makes a completely inelastic collision with Skier B, who is stationary, and has a mass of 55kg.Immediately after the collision both skiers have a speed of 5.8m/s. a)Find the speed of skier A immediately before the collision. (I got ...

*October 25, 2015*

**Physics**

Thank you!

*October 25, 2015*

**Physics**

A motorcycle rider plans to make a jump off a ramp. If he leaves the ramp with a speed of 38.0m/s and has a speed of 36.3m/s at the top of his trajectory, determine his max height above the end of the ramp. Ignore friction and air resistance. i got 6.45m but i really don't...

*October 25, 2015*

**geometry**

The length of a rectangle is 4 times its width. If the perimeter of the rectangle is 70 ft., find the area.

*October 4, 2015*

**Chemistry**

Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look like 2Fe^+3 + 3SO4^-...

*October 4, 2015*

**Chemistry**

Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look like 2Fe^+3 + 3SO4^-...

*October 4, 2015*

**science**

How fast does a kHz travel per second?

*September 20, 2015*

**Physics**

what is its velocity when it returned to the elevation from where it was thrown?

*September 19, 2015*

**Math**

The Wildcats basketball team scored 18 points in the first half of the game. All the points came from either 2 or 3 point baskets. If a total of 8 shots were made ( some two pointers and some three points), how many of each type of shot were made?

*September 3, 2015*

**physics 1401!**

A closed-end tube is evacuated and placed with its open end beneath the surface of a reservoir of water. The water rises to a height of 9.5 m. If the density of water is 1000 kg/m^3, what is the pressure at the bottom of the column of water?

*July 7, 2015*

**physcial science**

What are the wavelength limits of the audible range of the sound spectrum? (Use the speed of sound in air. The speed of sound in air is 344 m/s. The audible range of the sound spectrum contains frequencies as low as 30 Hz and as high as 25 kHz.)

*June 23, 2015*

**physcial science**

Picnickers see a lightning flash and hear the resulting thunder 7.9 s later. If the storm is traveling at a rate of 20. km/h, how long, in minutes, do the picnickers have before the storm arrives at their location?

*June 23, 2015*

**Math**

10-2/3p=42 I think the answer is p=63

*May 27, 2015*

**How do you delete a question here?**

is there a way to change my name?

*May 6, 2015*

**How do you delete a question here?**

I really need to delete it for school

*May 6, 2015*

**How do you delete a question here?**

is there a way to delete my name off of it?

*May 6, 2015*

**english/polsci essay excerpt edit**

as in whole papers

*May 3, 2015*

**english/polsci essay excerpt edit**

Hi Do you edit papers at all?

*May 3, 2015*

**english/polsci essay excerpt edit**

Can someone edit this? Also, does anyone edit whole papers? (Essay redacted per request from original poster.)

*May 3, 2015*

**Math**

-3(9+x)=33

*April 30, 2015*

**math**

Angle of elevation is 15 degrees and we're trying to solve for the hypotenuse of the right triangle given the adjacent is 7.11 m. We could use primary trig ratios to solve - COS. Let x represent the length of the ramp (hypotenuse) Cos15= ADJACENT/HYPOTENUSE Cos15= 7.11/x x...

*April 28, 2015*

**Calculus**

3 .079m

*April 7, 2015*

**Chemistry**

A 5.00 L flask with mass of 463.873 g is filled with Ar gas to 3 atm pressure at 292 k. (19 celsius + 273) what is the mass of flask and gas?

*April 4, 2015*

**physics**

a 20newton object Is pulled along a horizontal surface at a constant velocity by a 30N force. What is the coefficient of friction

*March 25, 2015*

**physics **

a 20newton object Is pulled along a horizontal surface at a constant velocity by a 30N force. What is the coefficient of friction

*March 25, 2015*

**Delete Question**

Hi can someone please delete one of my questions?

*March 24, 2015*

**Math**

Kool Klothes has determined that the revenue function for selling x thousand pairs of shorts is R(x) = -5x^2 + 21x. The cost function C(x) = 2x + 10 is the cost of producing the shorts. a) How many pairs of shorts must the company sell in order to break even

*March 21, 2015*

**math**

An aeroplane leaves a runway and climbs at an angle of 15 degrees. After flying 800 meters, how high is it above the runway?

*March 11, 2015*

**essay edit excerpt**

can someone edit this? The Monroe Doctrine allowed the president to extend his diplomatic power by specifying that he can provide for defense against other nations. Prior to this document’s establishment, the Neutrality Proclamation set the skeleton of the President’...

*March 5, 2015*

**Chemistry Need Help**

I can solve it now. Sorry about the post.

*March 1, 2015*

**Chemistry Need Help**

How many grams of baking soda, NaHCO3, are needed to react with 125 mL of stomach acid having an HCl concentration of 0.05984 M? The reaction is NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l). Do I need to chenage mL to L first? I'm really stuck with this question...

*March 1, 2015*

**Chemistry**

The density of water at 30*C is 0.9956g/mL. If the specific gravity of acetic acid is 1.040 at 30*C, what is the density of acetic acid at 30*C?

*February 23, 2015*

**math NEED HELP**

2x+5 x+4 ------ - --------- x^2+3x+2 x^2+3x+2 i keep getting x+9 ------------ (x+1)(x+2)

*February 5, 2015*

**physics 11**

m1 = 1000kg vi1 = -25m/s m2 = 2250kg vi2 = 10m/s vf = ? m/s (m1*vi1)+(m2*vi2)=(m1+m2)vf vf=[(m1*vi1)+(m2*vi2)]/ [m1+m2] vf=[(1000*-25)+(2250*10)]/[1000+2250] vf = -0.769m/s OR vf = 0.769m/s south

*January 22, 2015*

**8th grade math**

iPhone is designing a smart phone with a square screen. The area of the screen will be 169 cm with an exponent of 2. What is the height of the screen? I think the answer is 13. Am I correct.

*January 7, 2015*

**Math**

In the Atlantic ocean off the coast of Bermuda lies a 500,000 square mile region called th Bermuda triangle . If the sides of the triangle are about 959 miles, 1,011'miles, and , 1,033, prove whether or not the Bermuda trian is a right triangle ?

*January 7, 2015*

**essay edit excerpt**

how do I expand on this? My academic prose has exhibited creatively re-establishing an original element with new messages through “A Closer Look: Analyzing Tangled (2012) and Its Deeper Critique of "Rapunzel" (1812). Firstly, I state that “most would ...

*December 10, 2014*

**essay excerpt edit**

Can someone edit this My writing has exhibited creativity by introducing a new perspective of stereotypical conventions that resulted in increased cognition through “A Closer Look: Analyzing Tangled (2012) and Its Deeper Critique of "Rapunzel" (1812). Firstly, I...

*December 10, 2014*

**essay excerpt edit- Does this flow/make sense?**

Creativity was initially understood as the process that, appropriate to its root, created something new. As such, it is defined by the Oxford English Dictionary as "the quality of creating" or "cause[ing a new element] to exist,” (Creativity)." It has ...

*December 4, 2014*

**essay excerpt edit**

Can someone edit this? I already edited it but it would still be helpful to get feedback. Although Benjamin does not explicitly define creativity in his article "The Work of Art in Mechanical Reproduction" he does make mention of "mechanical reproduction," ...

*November 27, 2014*

**Essay Excerpt Edit**

Can someone edit this? Please be forewarned that its a first draft so I am aware that it is not developed yet. Any feedback would help a lot. Clearly, Jason Russell's Kony 2012 campaign proves how YouTube has altered our understanding of creativity from the change that ...

*November 24, 2014*

**chemistry**

why might consuming more of daily rni of a vitamin or mineral be harmful

*November 18, 2014*

**essay edit**

can someone edit this? Thanks in advance! Mcnamara's Eleven Points in light of the US's involvement with the War in Iraq The inevitable fog of misunderstanding and irrational human error within war can lead to mass killings, chaos, and inevitable failure. The U.S. and ...

*November 12, 2014*

**Math**

Please help me write this in an equation. "Tyrone bought 15.3 gal of gasoline priced at g dollars per gallon, 2 qt of pil priced at q dollars per quart, and a wiper blade priced at $3.79. Write an expression that represents the total cost of these items.

*November 9, 2014*

**Math!!**

3.4t+19.36=-10.22

*November 4, 2014*

**essay edit**

Can someone look over this? I've been working on wordiness, sentence structure, and repetition. Tangled and its Hidden Critique of Rapunzel Peeking at the mere surface of the film Tangled (2010) directed by Nathan Greno and Brian Howard, most would presume that it is ...

*November 2, 2014*

**essay excerpt edit**

Do you mind if I send you a copy of the essay? I have already read it aloud and tried to cut down on wordiness, but the words I use are carefully chosen and have a purpose, so I don't want to lose the purpose of the essay either. I'm not sure where I am going wrong ...

*November 2, 2014*

**essay excerpt edit**

can someone edit this? To contrast, in the film Tangled (2010) the mother of Rapunzel, who is exhibited as a Queen, also falls ill, although it is due to legitimate medical ailments, as opposed to a sense of helplessness. She is then limited to a bedridden state while pregnant...

*November 2, 2014*

**Math**

Find the radius of a sphere with a volume of 1,767.1 m (3 cubed) would I use the formula V=4/3*pie*radius (3 cubed)

*October 29, 2014*

**Math**

Please help..not wanting answer just where to start... A cylinder has a radius of 5 centimeters and a height of 12 centimeters. What would the height of a cone need to be if it is the same volume and radius?

*October 28, 2014*

**Math**

A cylinder has a radius of 5 centimeters and a height of 12 centimeters. What would the height of a cone need to be if it is the same volume and radius?

*October 28, 2014*

**Math**

Find the volume of a bag if the bag is 5.5in X 3in X 8in

*October 27, 2014*

**math**

a telephone pole is supported by two cables attached to points on the pole 15 ft above ground and to points on the level ground 8 ft from the foot of the pole. what is the total length of the two cables

*October 13, 2014*

**Divisors?**

Will it be 1,2,5? So 5 being the largest?

*October 9, 2014*

**Divisors?**

What is the largest remainder possible if the divisor is 10? I am helping my child and do not know how to do this Please show me how to and how to explain it.. Thank u

*October 9, 2014*

**5th grade Math**

Thank you Ms. Sue and Damon!

*September 20, 2014*

**5th grade Math**

A recipe call for the following ingredients: 3c flour 1/2t salt 3/4c sugar 4c fruit 2T butter To make 2/3 of the recipe, how much of each ingredient should you use. Question, should I multiply of divide by 2/3?

*September 20, 2014*

**ENGL essay excerpt edit**

can someone edit/ give any feedback on this? Additionally, my essay The Latent Path to Progression demonstrates how creative freedom is necessary in the development of societal contributions that will ultimately lead to its progression. For instance, I present how “I ......

*September 13, 2014*

**english essay edit**

Furthermore, Your Creative Elusive Genius sharply contrasts to John Stuart Mill's Chapter III: Of Individuality as One of the Elements of Well-Being. For instance, Elizabeth Gilbert presents an anecdote of Thomas Waits, who she describes as an anxious and uncontrolled ...

*August 31, 2014*

**chemestry**

What is the energy of the photon emitted when the electron in a hydrogen atom drops from energy level E5 to energy level E2?

*July 12, 2014*

**essay excerpt edit**

can someone edit this This racially perceptive scene clearly demonstrates how social separation due to racism will always end in bitterness. On the surface, Radio Raheem is merely speaking of how life is a consistent battle between good versus evil, love versus hate, and right...

*June 1, 2014*

**english- Intro edit**

can someone edit this The mere pigment of one’s skin deep makeup has served as the basis for hurtful bias, racism, and other discriminating actions within our society. The racially perceptive film, Do the Right Thing by Spike Lee, exemplifies how segregation amongst ...

*May 26, 2014*

**calculus help**

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. x = 4(square root of (3y)), x = 0, y = 3; about the y-axis V=?????

*May 3, 2014*

**calculus help please **

A piece of wire 14 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. (a) How much wire should be used for the square in order to maximize the total area? = 14 m (b) How much wire should be used for the square in ...

*April 15, 2014*

**Math**

Hi steve, thank you for this, if you please can you give me an explanation :( im short with answers, and quite busy at work.

*March 24, 2014*

**Math**

Mohammed had ducks and cows on his farm. These 14 animals had a total of 40 legs. How many each animals did Mohamed have?

*March 24, 2014*