Saturday

September 5, 2015
Total # Posts: 264

**math**

solve by the elimination method: 9x-9y=18 7y-3x=-8 please solve step by step thank you for your help
*July 25, 2011*

**chemistry**

Calculate the number of moles of FeSO4 in 25cm3 of a 0.2mol dm3 solution
*June 21, 2011*

**Chemistry **

A gas has a volume of 50.0 cm3 at a temperature of -73°C. What volume would the gas occupy at a temperature of -123°C if the pressure stays constant
*June 12, 2011*

**math**

The best answer is D - 6. The two negatives cancel each other out, making the sum 18 divided by 3, equaling 6.
*May 20, 2011*

**college chem**

The cation M2+ reacts with NH3 to form a series of complex ions as follows: M2+ + NH3 M(NH3)2+ K1 = 102 M(NH3)2+ + NH3 M(NH3)2 2+ K2 = 103 M(NH3)2 2+ + NH3 M(NH3)3 2+ K3 = 102 A 1.0 × 10–3 mol sample of M(NO3)2 is added to 1.0 L of 15.0 M NH3 (Kb = 1.8 × 10&#...
*April 24, 2011*

**physics**

What is the average current through a conductor that carries 4 375C during a 2 min time period?
*April 13, 2011*

**english**

What opinion might they have of the author? What could you as a writer do to prevent this problem?
*March 28, 2011*

**english**

How might readers react if the topic sentences in an essay did not coincide with the supporting points, and why would their reaction be justified?
*March 28, 2011*

**business**

Direct verse indirect cost Estep Construction Company is composed of two divisions: (1) Home Construction and (2) Commercial Construction .The Home Construction Division is in the process of building 12 houses and the Commercial Division is working on 3 projects. Cost items of...
*March 26, 2011*

**chem101**

propyl Bromide reacts with Mg, Propanone, H+ to yeild what?
*March 26, 2011*

**chem101**

Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.
*March 24, 2011*

**The world History**

where are the questions to assignments 1-5 world history number007678
*March 6, 2011*

**chem**

What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?
*March 5, 2011*

**Chemistry**

What volume of dry hydrogen would be produced under standard consitions when 0.250g of magnesium reacts with excess HCl?
*February 23, 2011*

**Math**

The surface area of a cylinder is 200cm. The diameter is equal to the height. Find the radius.
*February 20, 2011*

**Math**

The surface area of a cylinder is 200cm. The diameter is equal to the height. Find the radius.
*February 20, 2011*

**Math**

Do the equations x = 5y + 3 and x = 5y – 3 have the same solution? How might you explain your answer to someone who has not learned algebra?
*February 8, 2011*

**algebra**

what are the coordinates of the points at which the slope of the function with the equation y = x^4 - 8x^2 is equal to zero ?
*December 27, 2010*

**physics**

Two boxes are similar. The larger box has a volume that is 64 times the volume of the smaller box. What is the ratio of the larger box's height to the smaller box's height? write the fraction as a decimal
*December 11, 2010*

**3rd grade**

What is a number sentence that shows the same product as the product of 9 and 2
*December 9, 2010*

**chem class**

A 25.00-mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 10.0 mL of KOH is ???? M.
*November 23, 2010*

**comp**

what is the verb tense in this sentence? Education is contributing a good role of successful financial planning.
*November 20, 2010*

**5th gr ade social studies**

each european group that set up colonies settled in a specific part of americas fact
*November 7, 2010*

**answer**

1/m-m/2=6X+5/12
*November 5, 2010*

**Physics Lab I**

Let's say you measure an average acceleration to be 0.4134 ms-2. What is the height (in centimeters) of the riser block? Assume the legs of the track span 1.0000 m and that there is neither friction nor drag. Also assume the block is under one of the legs. ?? cm Use three ...
*November 3, 2010*

**Chemistry check my answer?**

Hi! is my answer correct? Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value ofKeq for this reaction is I solved by...
*October 25, 2010*

**adult education**

we have a ring that has an indian head marking on the inside of the ring, do you know what it means, who made it, how old it is, or what its actually called so we can search the meaning ?
*October 22, 2010*

**5th grade**

what are 4 possible tune-ups to help you keep a postive attitude?
*October 18, 2010*

**math**

f(x)=ax+b f(-2)=27 and f(1)=15 find the value of x when f(x)=-5 how do you work this out?? thanks so much
*October 13, 2010*

**9th grade**

A square made by a length of string 8 cm long is reshaped into a circle. What is the circumference of the circle
*September 24, 2010*

**Real Estate Management**

$34,500
*September 22, 2010*

**Physics**

Wha?
*September 20, 2010*

**Physics**

A chain composed of four identical links is suspended by a rope and does not move. What are the forces on each chain? (include where they come from)
*September 20, 2010*

**accounting**

There is also a lot of companies that report their federal taxes using the accrual basis and their state taxes on the cash method. Why do you think a company would want to do this?
*September 12, 2010*

**college physical science**

how much would a 80.0kg person weigh on earth where the acceleration of gravity is 1.63m/s2
*September 6, 2010*

**college physical science**

how much would a 80.0kg person weigh on mars if the acceleration of gravity is 3.93m/s2
*September 6, 2010*

**college physical science**

According to table 1.3, what volume of iron would be needed to balance a 1.00cm3 sample of lead on a two pan laboratory balance? Table 1.3 shows densities g/cm3 such as iron=7.87g/cm3 and lead is 11.4g/cm3
*August 29, 2010*

**Physical Science**

A cubic tank holds 1,000kg of water. What are the dimensions of the tank in meters. Explain your reasoning.
*August 29, 2010*

**Physics**

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?
*July 1, 2010*

**Physics**

The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest or “ground” state, n=3 is the third state, and so on. If the atom’s diameter is 1x10-10m in...
*July 1, 2010*

**Chemistry**

A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
*June 30, 2010*

**Chemistry**

A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
*June 29, 2010*

**Physics**

How does one Coulomb of charge compare to the charge on an electron? How do you think such a large difference arose historically?
*June 25, 2010*

**Physics**

Where should most of the mass be for an industrial fly wheel? Why? can't find any thing about this in my book. need help answering this.
*June 18, 2010*

**math**

Hi, the £ is pound sterling and p is pence, so can be swapped for $ and c/
*June 16, 2010*

**math**

I am an odd multiple of 50p. My number of £s is double 18. What am I?
*June 16, 2010*

**Physics/ Science**

How does a derivation differ from an experiment or a theory?
*May 29, 2010*

**Physics**

Having trouble determ the formulas for the follow problems. 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? 60 km 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two seconds, how far does it...
*May 29, 2010*

**physics**

An object 7.25 cm high is placed 15.1 cm from a convex mirror of radius 55.2cm. (a) What is the image distance?
*May 24, 2010*

**math**

3/5 + 1/10=? i got 7/10 or 12/20, which one is correct?
*May 18, 2010*

**music**

2. What role did Totalitarianism play in the creation of music particularly in Germany and the Soviet Union during the twentieth-century? Which composers were most affected by totalitarianism? How did affect their lives?
*May 14, 2010*

**reply to Q " Physics hard... can't get it right"**

kk this is what i did V=strt(3*k=8.31*T=1365)/m=5.32*10^-26
*May 6, 2010*

**Physics hard... can't get it right**

oo ok let me try that also can you tell me the distinction like when to use gas constant and boltzmann constant
*May 6, 2010*

**Physics hard... can't get it right**

strt(3 * k=8.31 * T=1365)/ m = 5.32*10^-26
*May 6, 2010*

**Physics hard... can't get it right**

A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. ...
*May 6, 2010*

**Physics hard...**

Young's Modulus (Y) 20 X 1010 N/m2 Shear Modulus (S) 8.1 X 1010 N/m2 Bulk Modulus (B) 16 X 1010 N/m2 The table to the above represents various properties of steel. You have steel wire 4.9 meters in length that stretches 0.16 cm when subjected to a force of 400 N. What ...
*May 6, 2010*

**physics**

A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. ...
*May 6, 2010*

**trig**

Graph three periods of the function. (identify period and phase shift and intercepts) y = f(x) = √3/2 sin(2x) - 1/2 cos(2x) if you can't graph it can you at least get it into that simpler form which is graph able.
*May 5, 2010*

**trig1 more question**

it is always true that if -1 ≤ x ≤ 1 then cos(Arccos(x)) = x Give an example showing that Arccos(cos(x))= x need NOT be true for all x
*May 4, 2010*

**Trigonometry**

Find all solutions for the following equation in the interval 0 ≤ x <2pi 3cos(3x)=6 i got cos3x=2, don't know how to go further i think it would be no solution but just want to confirm.
*May 4, 2010*

**physics**

20meters
*May 4, 2010*

**Government**

How can the actions of urban elites help explain the Great Recession?
*May 1, 2010*

**social studies**

Why did Mao Zeodong led the cummunists to power in china
*April 22, 2010*

**Math**

The width of a rectangle is fixed at 16 cm. What lengths will make the perimeter greater than 78cm? Would the answer be 23 because 16*2+23*2=78cm or would the answer be 24. Because the perimeter is greater than 78cm
*April 8, 2010*

**Math**

thank you
*April 8, 2010*

**Math**

Media service charges $20 for a phone and $30/month for its economy plan. The equation c=30t +20 describes the total cost,c, of operating Media Services phone for t months. A) The total cost for 8 months of service is? My answer $260 If a customer has only $90 available, how ...
*April 8, 2010*

**Math**

Thank you for the help.
*April 7, 2010*

**Math**

Trains A & B are traveling in the same direction on parallel tracks. Train A is going 60mph and Train B at 80mph. Train A passes a station at 6:25 am. If Train b passes the same station at 6:37, what time will B catch up with A? The answer I received is: 7:03am, is that correct?
*April 7, 2010*

**Business Law**

Express versus Implied Contracts. Suppose that a local businessperson, McDougal, is a good friend of Krunch, the owner of a local candy store. Every day on his lunch hour McDougal goes into Krunch¡¦s candy store and spends about five minutes looking at the candy. ...
*March 15, 2010*

**chemistry correction**

1. Which two elements react vigorously with each other? A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. A: Electronegativity decrease across a period. B:...
*March 11, 2010*

**Math**

The exhibit hall at the fair is dividid into three sections. Tow-fifths of the exhibits are in section B of the hall, and another two-fifths ain in section C. What fraction of the exhibits are in located in section A? We have multiple choice answers. Thank you
*March 1, 2010*

**chemistry**

1.Use the Vsepr theory to predict and explain the shape and bond angle of each of the molecules SCI2 and C2CL2. 2.Deduce whether or not each molecule is polar, giving a reason for your answer...Any help please??
*February 28, 2010*

**chemistry**

.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.
*February 26, 2010*

**chemistry**

1.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces. 2. The element sodium, aluminum, silicon, phosphrous, and sulfur are in periods 3 of the periodic table. Decribes the metallic bonding present in ...
*February 26, 2010*

**COM/155**

Assume you essay was written for an audience of a Midwest city's newspaper readers. What will you include in your introduction? What tone will you use? You can use your essay topic to answer these questions, as your answers will help you write your introduction. Remember, ...
*February 17, 2010*

**chemistry**

What will be the mass in grams of hydrogen atoms (only) that will be present in 22.2 g of compound A (XH3)?
*February 1, 2010*

**Math**

dx can't be zero
*February 1, 2010*

**chemistry**

Magnesium reacts with HCl(aq) to form MgCl2 and H2(g) ____ Mg(s) + ____ HCl(aq) -----> ____ MgCl2(aq) + ____ H2(g) The following data was collected for the above reaction: Mg (g) 5% (m/v) HCl (ml) H2 gas produced (ml) 0.50 10 167 0.50 20 333 0.50 30 500 0.50 40 500 0.50 50 ...
*January 29, 2010*

**chemistry**

The actual chemistry question was, given that there are 4.19 g of C6H6 how many moles do you have and this is how I solved it and it was wrong. 4.19g/78g/mole = .054 moles of C6H6
*January 23, 2010*

**chemistry**

How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams? I took 13 grams and divided it by the ...
*January 23, 2010*

**math**

Sorry, a 100-gon is a 100 sided polygon.
*January 23, 2010*

**math**

a lot of times teachers will throw in a unit that has no meaning. They do this to get used to the idea of always carrying your units out with the problem. I suspect that is what is happening with your problem as I have never heard of a gon.
*January 23, 2010*

**chemistry**

How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams?
*January 23, 2010*

**Trigonometry**

take the tangent of 70 degrees and multiply it by 30 yards.
*January 23, 2010*

**physics.**

: When the mass hits the pile, it has kinetic energy. This energy is transformed into other forms of energy as the speed of the falling mass rapidly reduces to zero. As this happens, the pile is forced a small distance into the ground. question: Explain how a large force is ...
*January 10, 2010*

**history**

What were the main elements of Johnson’s War on Poverty?
*December 14, 2009*

**history**

What were the main elements of Johnson’s War on Poverty?
*December 14, 2009*

**Calculus**

Would someone please tell me how to solve these two problems? Find the indefinite integral: x(x-1)^5 dx (v^2)(1-v)^6 dv
*November 18, 2009*

**science**

what is air? a compound, a mixture, a solution, or an amalgam
*October 9, 2009*

**chemistry.**

What amount of H2(g) is produced when 12g of magnesium reacts completely with dilute HCl(aq) Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)
*September 28, 2009*

**chemistry.**

What?
*September 28, 2009*

**chemistry.**

Lithium hydroxide reacts with carbon dioxide as follow. 2LiOH + CO2________ Li2CO3 + H2O What mass (in grams) of Lithium hydroxide is need to react with 11 g of carbon dioxide?
*September 28, 2009*

**Physics**

Thank you, I really appreciate that help. We haven't done derivatives yet and its hard to see without that knowledge...
*September 22, 2009*

**Physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find ...
*September 22, 2009*

**Math**

First Estimate, and then multiply to get the exact answer. 2*4/7*7*5/11*5
*September 13, 2009*

**Math**

First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 9*2/7*8/5/7
*September 13, 2009*

**Math**

First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 9*2/7*8/5/7
*September 13, 2009*

**Math**

First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 2*1/3*15
*September 13, 2009*

**chemistry.**

They are__________Mol of carbon atoms in 4 mol of Dimedthysulfoxide A: 2 B: 6 c: 8 D: 4 E: 3 My answer is C:8 but can any one help me with the method to show the right answer. 2. There are ___________Sulfur atoms in 25 molecules of c4H4S2. My answer is 50...Can one help me. 3...
*September 12, 2009*