Friday

December 9, 2016
Total # Posts: 918

**chemistry**

After writing a balanced equation for the reaction between magnesium and hydrochloric acid, calculate the mass of magnesium needed to produce 90ml of hydrogen gas @ STP conditions.

*December 9, 2010*

**Calculus**

radical 2

*December 8, 2010*

**General Physic**

The time it takes for an object dropped from the top of cliff A to hit the water in the lake below is twice the time it takes for another object dropped from the top of cliff B to reach the lake. If it takes 2.30 s for the object to fall from cliff A to the water, what are the...

*December 5, 2010*

**english (Frederick Douglass)**

Whatis the most important description of Mr. Gore?

*December 4, 2010*

**english (Frederick Douglass)**

Why do you think Douglass says of the killing of slave Demby ‘in an instant poor Demby was no more. His mangled body sank out of sight, and blood and brains marked the water where he stood.”?

*December 4, 2010*

**sociology**

Im in Illinois and Yes its the same book Chapter 12 pg 365... Im so lost and don't know where to start. From Rasmussen as well. LOL

*December 3, 2010*

**history**

How did the settlement house movement differ from earlier attempts to relieve poverty?

*December 2, 2010*

**history**

in the 1800s

*December 2, 2010*

**history**

How did professionalization meet the needs of the developing American economy In the urban life?

*December 2, 2010*

**childcare**

ok thanks

*November 30, 2010*

**childcare**

its for my homework

*November 30, 2010*

**childcare**

exam 00383001 need help withj 5 questions

*November 30, 2010*

**childcare**

thanks :O)

*November 30, 2010*

**English (Grade 6)**

What is the best website to practice direct and indirect speech, adjectives and verbs for free? Thank you

*November 29, 2010*

**physics**

When a woman runs 140 meters north and then 60 meters west, what is the magnitude of her total displacement?

*November 27, 2010*

**Physics**

How does progress today differ from progress thousands of years ago?

*November 24, 2010*

**MATH **

3 OUT OF EVERY 4 STUDENT HAVE A COMPUTER AT HOME IF THERE ARE80 STUDENTS HOW MANY HAVE COMPUTERS AT HOME

*November 22, 2010*

**MATH **

IN A CLASS 3 OUT OF EVERY 7 STUDENT ARE MALES IF THERE ARE 27 MALES HOW MANY STUDENT ARE IN THE CLASS

*November 22, 2010*

**12th Grade Government**

Why was it important to the Founding Fathers to justify their actions by evoking traditional English rights?

*November 22, 2010*

**12th Grade Government**

_____ believed that there should be no limits to the power of the government once the will of the people was determined.

*November 22, 2010*

**physics**

Suppose I have a spring. I add a mass (m = 1.0 kg) and it is displaced by 15 cm. What is the spring constant k in units of (N/m)?

*November 18, 2010*

**Accounting**

Need help with this bank reconciliation...this is actually for a job and I am forgetting everything about accounting because I am nervous. BANK RECONCILATION ============================================== On Aug 14th, One of our Partner's ( Compuville ) cash book showed a ...

*November 17, 2010*

**algebra**

Use muliplying by 1 to find an expression equivalent to 10/13 with a dominator of 39a Please kindly help. I don't understand what to do. Thanks!

*November 14, 2010*

**math116**

-8x-27=-32 1/5 the solution must be in the form as an integer or simplified fraction. Thank you.

*November 12, 2010*

**PHYSICS ---HELP!**

A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein . The inside diameter of the 4.8 cm long needle is 0.48 mm, and the required flow rate is 4.9 cm/3 of blood per minute. How high should the ...

*November 12, 2010*

**physics**

Blood from an animal is placed in a bottle 2.0 m above a 3.4 cm long needle, of inside diameter 0.35 mm, from which it flows at a rate of 2.9 cm^3/min. What is the viscosity of this blood? Assume Pblood}=1.05 * 10^3 kg/m^3.

*November 11, 2010*

**chemistry**

a 5% acetic acid solution contains -----grams of acetic acid per ------

*November 11, 2010*

**College Algebra**

USE MULTIPLICATION PRINCIPLE - X/2 = 8 X=_________ I APPRECIATE THE HELP!

*November 8, 2010*

**math**

complete the order triple 8x-y+z=22, 4x+2y-3z=13, x-3y+2x=-6

*November 7, 2010*

**Alg & Trig 2**

find the sum of 1/2, 2/7x, and 5/x

*November 5, 2010*

**Alg & Trig 2**

find the sum of 1/2, 2/7x, and 5/x

*November 5, 2010*

**intro chem HELp please**

Jizz

*November 5, 2010*

**Chemistry**

Calculate the enthalpy change in kJ when 21.6g of H2S is burned. 2H2S(g) + 3O2(g) --> 2SO2(g) + 2H20(g) Change in H=-1036kJ/mol

*October 31, 2010*

**Business**

Which economic system is the best solution to handling a crisis of epic proportion?

*October 29, 2010*

**Physics Help!!**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the ...

*October 26, 2010*

**science**

Which of the following chemical reactions is written to show that mass is conserved? A H2O to H2+O2 B CH4+202 to CO2+2H2O C Mg+HCI to 3MgCI0+H2 D N2+H2 to NH

*October 26, 2010*

**Physics**

A 3.6 m diameter merry-go-round is rotating freely with an angular velocity of 0.78 rad/s. Its total moment of inertia is 1700 kg m^2. Four people standing on the ground, each of mass 62 kg, suddenly step onto the edge of the merry-go-round. What is the angular velocity of the...

*October 26, 2010*

**English**

Idententify the sentence parts - Whose car did the parking attendant tow yesterday?

*October 25, 2010*

**phsics**

for this you just take the inverse tan of .4 and will get theta.

*October 24, 2010*

**consumer math**

$400.OO

*October 20, 2010*

**Finance**

what is the present value of 1000 paid at the end of each of the next 100 years if the interest rate is 7% per year

*October 17, 2010*

**College Algebra and Trig**

a rancher has 12,000 feet of fence to enclose 5 adjacent pens. determine the outer rectangular dimensions that result the maximum enclosed area.

*October 14, 2010*

**math**

Erica took 2 days to drive 1,020 miles. On the first day she drove 10 hours at an average spped of 62 mile per hour. on the second day, her average spped was 57 miles per hour. approx. how long did she drive on the 2nd day?

*October 11, 2010*

**geometry**

A manufacturer wants to make a rectangular storage box with volume 0.75 cubic meters, length 1.5 meters and width 0.4 meters. What is the height of the box?

*October 11, 2010*

**math**

the coordinates of triangle KLM are K(-2,-5), L(0,1), M(6,-2) What type of triangle is KLM? A) obtuse isosceles B) acute scalene C) right isosceles D) right scalene

*October 11, 2010*

**GEOMETRY**

Alicia is 5ft tall. she casts a shadow that measures 6 1/2 feet long at the same time that a sculpture in the park casts a shadow 12 ft long. which of the following is the approximate height of the sculpture? a) 2.0 miles b) 6.6 miles c) 12 miles d) 15.6 miles

*October 11, 2010*

**Ohlone**

6moles

*October 7, 2010*

**math**

how do you find the function of the domaine

*October 5, 2010*

**social studies**

they are nomadic

*October 5, 2010*

**Chem.**

Suppose that 55 mL of 0.2 M LiOH and 55 mL of 0.3 M HNO2 are mixed. What is the K for the dominant equilibrium in terms of Ka's, Kb's, Kw etc.?

*October 4, 2010*

**Chemistry**

NH4+ OH-=NH3+H20

*October 4, 2010*

**Chemistry**

NH4+ + OH- NH3 + H2O What is the K for the reaction above in terms of Ka's, Kb's, Kw etc.?

*October 4, 2010*

**Psychology**

What different tools of psychology help us with work and everyday life situations?

*October 3, 2010*

**Chemistry**

Calculate the solubility of LaF3 in grams per liter in the following solutions. The Ksp of LaF3 is 2.01 e-19. (a) pure water (b) 0.051 M KF solution (c) 0.065 M LaCl3 solution

*October 1, 2010*

**physics**

Your groceries are in a bag with paper handles. The handles will tear off if a force greater than 59 N is applied to them. (a) What is the greatest mass of groceries that can be lifted safely with this bag, given that the bag is raised with constant speed? kg (b) What if it is...

*September 30, 2010*

**reading**

see Marjorie's personality as shallow

*September 28, 2010*

**math **

-2(-5+2)-3(3-4)-5

*September 25, 2010*

**math **

on a single day the temperature in alaska dropped from a high of -12 f to a low of -50. what os the difference between the high and low temperatures

*September 25, 2010*

**Chemistry**

3H2(g)+N2(g)=2NH3(g) Suppose the equilibrium constant Kp = 0.003337 for the reaction above. If the equilibrium mixture contains partial pressures H2 = 0.400 atm and N2 = 0.350 atm. What is the equilibrium partial pressure of NH3 in atm?

*September 23, 2010*

**physics**

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 2.5 s, how tall is the building?

*September 20, 2010*

**Algebra**

how do you factor 4c^3-500 ?

*September 11, 2010*

**art**

please help me pick a favorite harlem Renaissance name of the picture date/time material used. and used for and symbolism

*September 11, 2010*

** college art **

please help me pick a favorite harlem Renaissance name of the picture date/time material used. and used for and symbolism

*September 11, 2010*

**physics**

A truck covers 40.0 m in 8.60 s while smoothly slowing down to a final velocity of 2.00 m/s. (a) Find the truck's original speed. (b) Find its acceleration.

*September 10, 2010*

**Chemistry**

Some physical properties of water are shown below. freezing point 0.00°C boiling point 100.00°C Kf 1.86°C/m Kb 0.512°C/m A 16.0 g sample of a compound known to contain 3 ion species is dissolved in 100. g of water. The boiling point of the solution is 103.6°...

*September 9, 2010*

**Chemistry**

If you are making 430.0 g of 0.41 m Na2SO3, how many grams of the solute should you use? I got 20 grams, but I don't think this is the right answer.

*September 8, 2010*

**math**

There are about 9ft per yard

*September 6, 2010*

**math**

Area= 2(L+W)

*September 6, 2010*

**Grammar**

Thank you

*September 6, 2010*

**Grammar**

(Check these please)Identify these sentences as compound, simple or run-on sentences. 5. Percy Shelley traveled in Europe and visited friends.(simple) 6. Shelley made friends with other poets; John Keats was Shelley's friend.(compound) 7. William Godwin was another friend...

*September 6, 2010*

**chemistry**

Which of the following are solutions? Choose all that apply. (Note: do not pick heterogeneous systems that contain a homogeneous phase.) - Cold coffee or cold tea. -Cigarette smoke. - Tap water. - Milk. - Fog. - The air typically found in a room. - Pure water.

*September 6, 2010*

**chemistry**

11:54Am

*September 3, 2010*

**Grammar**

Thank you

*August 30, 2010*

**Grammar**

Is this one right. The most likely theory, perhaps,/called it a comet of tiny pieces of metal.

*August 30, 2010*

**Grammar**

Seperate the complete subject and the complete predicate. There are many theories/ about the Tunguska Fireball. Is this right?

*August 30, 2010*

**science**

A mixture of two gases, Xe and H2, has the properties listed below. PXe=190torr PT=250torr What is the ΧH2 for this mixture? I'm sorry I really don't get this.

*August 26, 2010*

**science**

A mixture of two gases, C2H2 and H2, has the properties listed below. nC2H2=0.028moles nH2=0.015moles PC2H2=79torr What is the PT for this mixture? I first found out the mole fraction by first adding H2 and C2H2 and got 0.043, then did 0.028/0.043. I rounded it to 0.651. I ...

*August 25, 2010*

**science**

oops the "t" is supposed to be a capital one, if that means anything.

*August 24, 2010*

**science**

Could anyone please explain this formula to me, and give me an example of how it is used? Pa=Xa*Pt the "a" and the "t" are subscripts.

*August 24, 2010*

**MATH**

use these facts to find the equation for the circle center (0,0), radius=6 a)x2-y2=36 b)x2+y2=36 c)x2-y2=6 d)x2+y2=6

*July 14, 2010*

**math**

in square ABCD, AD=3x+7 and CD=6x+6 Find AD and CD A)1/3 B)16 C)3 D)8

*July 13, 2010*

**MATH**

In isosceles trapezoid ABCD, AB=22, CD=34 and AC=10. Find BD A)28 B)5 C)10 D)35

*July 13, 2010*

**math**

using the law of detachment, what can be concluded regarding the following statements: If a figure is a rhombus, then it is an eqilateral quadrilateral. A square is a rhombus. a) a rhombus is a square b) a square is a rhombus c) a square is an equilateral quadrilateral d) an ...

*July 13, 2010*

**math**

which statement is biconditional a)if x=5, then 2x+3=13 b)if two angles are a linear pair, then they = 180 degrees c) if the car runs out of gas, then it will stop d) if a figure is square, then it has four sides

*July 13, 2010*

**math**

simplify -2(-6y+2) +4y(4z+5y)

*July 11, 2010*

**Chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na^+ ions of 1.3 M? Express your answer numerically in grams.

*July 7, 2010*

**Chemistry**

A student placed 17.0 g of glucose (C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100 mL mark on the neck of the flask was reached. The flask was then shaken until the solution was ...

*July 7, 2010*

**Chemistry**

How many kilograms of chlorine are in 22 kg of each of the following chlorofluorocarbons CFCs? 1.CF2Cl2 2.CFCl3 3.C2F3Cl3 4.CF3Cl

*July 7, 2010*

**Chemistry**

Determine the number of moles of oxygen atoms in each of the following. 5.91mol H2O2 2.7mol N2O 2.23mol CO2

*July 7, 2010*

**Chemistry**

Silver chloride, often used in silver plating, contains 75.27% Ag. Calculate the mass of silver chloride required to plate 195mg of pure silver.

*July 7, 2010*

**Chemistry**

Upon decomposition, one sample of magnesium fluoride produced 1.64 kg of magnesium and 2.57 kg of fluorine. A second sample produced 1.38 kg of magnesium. How much fluorine (in grams) did the second sample produce?

*July 7, 2010*

**college chemisrty**

A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....

*July 7, 2010*

**college chemisrty**

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 and the initial pressure of chlorine was 1.65 . The piston was pushed down to change the volume to 1.00 . Calculate the final pressure of the gas if the ...

*July 7, 2010*

**college chemistry**

A closed container is filled with oxygen. The pressure in the container is 325 . What is the pressure in millimeters of mercury?

*July 7, 2010*

**chemistry**

Imagine that you have a 7.00 gas tank and a 3.50 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 115 , to what pressure should you fill the ...

*July 7, 2010*

**MATH**

a picture measures 16inches wide by 20inches long. if the frame is to be 20inches wide, what is the scale factor of the frame as a dilation of the picture, and what is the length of the frame?

*July 7, 2010*

**math**

which of the following triangles is both an obtuse triangle and isosceles triangle. A triangle with angles measuring: a) 60,60,60 b) 120,30,30 c) 110,15,55 d) 30,70,80

*July 7, 2010*

**math**

a picture measures 16inches wide by 20inches long. if the frame is to be 20inches wide, what is the scale factor of the frame as a dilation of the picture, and what is the length of the frame?

*July 7, 2010*

**math**

Bob constructed a decorative planter using 4inch squares attached to a rectangular base. what is the volume of the planter/

*July 7, 2010*

**math**

what is the total surface area in meters of a cylinder that is 12m in diameter and 14m in height

*July 7, 2010*