Tuesday

September 16, 2014

September 16, 2014

Number of results: 17,888

**Chemistry**

"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...
*September 13, 2012 by Travis*

**physics**

Hi, I am confused about physics, more specifically force. I know that the formula for force is: f=ma So what if an object traveling at constant speed (acc equals zero) collides with a wall? How would you calculate the force, since there is no acceleration? There IS force upon ...
*June 28, 2005 by Ashley*

**Chemistry**

Consider an ideal gas encloesd in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 20.0 L. w = ____ J now calculate the work done if this process is carried ...
*February 10, 2012 by Lauren*

**chemistry**

Construct a galvanic (voltaic) cell from the half reactions shown below. Au3+ + 3 e- → Au (s) ξo= 1.420 V Br2 (l) + 2 e-→ 2 Br- (aq) ξo= 1.087 V Calculate the equilibrium constant (K) for this cell. Assume that the temperature is 298K. First, consider ...
*May 2, 2014 by bekah*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*June 29, 2012 by Tracy*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*June 29, 2012 by Tracy*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*June 29, 2012 by angela*

**chem**

1. Calculate the heat (calories) produced by the solution of 3.75 g of NaOH Hint: Remember that the reaction is exothermic. 2. Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved. (Î”HsolnNaOH) For #1. delta H(solution)=deltaH(...
*October 19, 2006 by Maria*

**Physics**

A dc electric motor found in the lab was being examined by a student. It was connected to a power supply and it was not attached to any load. (a) The student stated, ‘when the motor is switched on, the electrical energy input should cause the motor to start rotating, and the ...
*August 31, 2009 by Alfred*

**physics**

A particle of mass 0.350 kg is attached to the 100-cm mark of a meter stick of mass 0.175 kg. The meter stick rotates on a frictionless, horizontal table with an angular speed of 6.00 rad/s. (a) Calculate the angular momentum of the system when the stick is pivoted about an ...
*October 22, 2012 by Karrine*

**Economics**

. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize profit? b. Calculate ...
*June 7, 2008 by SMsm*

**Economics**

6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize profit? b. Calculate ...
*June 7, 2008 by SMsm*

**Economics**

6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize profit? b. Calculate ...
*June 7, 2008 by SMsm*

**microeconomics**

consider total cost and total revenue given in the table bellow: quantity total cost total revenue 0 $8 0 1 $9 8 2 $10 16 3 $11 24 4 $13 32 5 $19 40 6 $27 48 7 $37 56 a. Calculate profit for each quantity. How much should the firm produce to maximize profit? b. Calculate ...
*January 26, 2009 by sara*

**chemistry**

Using data from this chapter, calculate the change in energy expected for each of the following processes Rb(g) + Br(g) Rb+(g) + Br -(g)
*December 7, 2007 by mel*

**ap chemistry**

How can I calculate the exothermic lattice energy when all I am given is the compound formula LiF?
*December 10, 2007 by Claudia*

**chem**

delta T = Kf*molality Plug in 5.00 C for delta T, 1.86 for Kf and calculate molality. Then molality x kg solvent x molar mass = grams. You know molality, kg solvent, and molar mass. Calculate grams. molar mass? where did u got the molar mass from ?
*February 5, 2008 by Mark*

**Chemistry**

Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?
*February 6, 2008 by Raj*

**physics**

Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N
*April 2, 2008 by Jon*

**math**

given that R= 2p(squared) divided by Q-3 1)Calculate the value of R when P=6 and Q=12. 2)rearrange the formula to make Q the subject.
*April 7, 2008 by scott*

**Chem II**

Calculate the pH and percent ionization for the solution made up of 0.035 M NH3 and 0.015 M NH4Br.
*April 14, 2008 by Ken*

**chemistry**

Calculate the current required to transfer 0.015 mols of electrons in a time of 20 min
*April 22, 2008 by Priya*

**math**

how to Calculate 30% of 40, and 25% of 20, then add the two results together? is the following correct 0.3 x 40 = 12 0.25 x 20 = 5 the total would be 12 + 5= 17
*July 24, 2008 by Jennyv*

**chemistry**

What is the balanced chemical equation for the reaction used to calculate of delta Hdagrees f of CaCO3(s)?
*October 19, 2008 by Lilit****

**college**

Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL. a. ) -0.77 b. ) -0.83 c. ) -0.90 d. ) -0.98 e. ) -1.01 i got c
*November 1, 2008 by A.A*

**Chemistry**

Calculate ΔHºrxn for the reaction 3 O2(g) ==> 2 O3(g) This is the information I am given: 2H2S(g) + SO2g) ==> 3S(s) + 2H2O(l)
*December 10, 2008 by Chris*

**chemistry**

Calculate the number of C, H, and O atoms in 4.50 g of glucose (C6H12O6), a sugar. okay i did it and i got just the C right and not the H and O help?
*January 5, 2009 by lyne*

**chemistry**

The pH of a 1.00 10-3 M solution of pyrrolidine is 10.82. Calculate Kb. i keep getting anumber that is ^ (positive) and thats way to big....
*February 15, 2009 by Jennifer*

**AP Chemistry**

In the titration of 50.0 mL of 1.0 M CH3NH2 (kb=4.4 x 10^-4), with 0.50 M HCl, calculate the pH a) after 50.0 mL of 0.50 M has been added b) at the stoichiometric point.
*March 29, 2009 by some kid*

**chem**

Calculate the root mean square speed (rms) for gaseous NH3 at 315 K
*April 20, 2009 by Anonymous*

**Math**

Can someone show me how to calculate the inner quartile range for the data set given? { 72, 80, 80, 82, 88, 90, 96}. Thanks.
*July 29, 2009 by B.B.*

**Chemistry**

How do I calculate how much sodium bicarbonate I need to neutralise 1L of 18M sulphuric acid?
*August 30, 2009 by Gille*

**Chemistry**

Consider the titration of 50.0 mL of 0.20 M NH3 (Kb = 1.8x10^-5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant.
*October 7, 2009 by Anonymous*

**physics**

Is it possible to calculate the torque acting on a rigid body without specifying the origin?
*October 9, 2009 by tom*

**Chemistry**

After 0.6523 g of is heated, the residue has a mass of 0.3423 g. Calculate the % H2O in the hydrate.
*October 13, 2009 by Jim*

**chemisrty**

how can you calculate the net charge of an ion if you know the number of protons, neutrons, and electrons it contains?
*November 4, 2009 by rica*

**Finance**

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios
*November 12, 2009 by Tonie*

**math**

Given the fuction y = log3(x+3)+2, calculate the zero of the function. GIve an exact answer.
*December 12, 2009 by Cyn*

**science**

Calculate the mass of SO3 gas that forms when 10g of SO2 reacts with oxygen
*February 26, 2010 by Anonymous*

**chemistry**

calculate the volume of 0.1M NaOH which must be added to 50 mL of 0.1M HCl to give a final solution of pH 6???
*March 4, 2010 by sara*

**chem**

calculate the pH for a solution that is made by combining 125ml of 6.0*10-2 M hydroflouric aid with 50 ml of .12 M sodium flouride?
*March 4, 2010 by Nikki*

**Chemistry**

Calculate the pH at 298K of solutions having the following ion concentrations? A. [H+]=1.0 x 10^-4M B. [H+]=5.8 X 10^-11M for A do you subtract 1.0 X 10^-14 from H+]=1.0 x 10^-4M
*March 8, 2010 by Anonymous*

**personal finance**

must calculate whether a couple should rent or buy a home.
*March 11, 2010 by don*

**microeconomic**

how to calculate price elasticity of demand of $3.00 to a increase to $3.50 and explain your reasoning and interpret the results
*March 27, 2010 by susie quick*

**Chemistry**

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)
*April 13, 2010 by Kim*

**Chemistry**

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)
*April 13, 2010 by Kim*

**chem**

Use this percentage to calculate the mass of fluorine in grams contained in 29.0 g of copper (II) fluoride
*April 25, 2010 by melissa*

**College chemistry**

How do you calculate the number of mL you would use to prepare 5.0 L of 0.20 M NaOH from a 5.23 M stock solution.
*April 26, 2010 by laney*

**chemistry**

calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C
*May 4, 2010 by Quentin*

**College Chemistry**

How do i calculate the pH when 200ml of .200M HCl is added .4998M of sodium acetate?
*May 9, 2010 by Jim*

**College Chemistry**

How do i calculate the pH when 200ml of .200M HCl is added .4998M of sodium acetate?
*May 9, 2010 by Jim*

**Algebra 2/trig**

How would I calculate the following function value? tan = 29degrees 36feet
*May 15, 2010 by Brenna*

**Chemistry**

Calculate (triangle H) for the complete combustion of 10.0g benzen. Equation? and could someone give me the answer?
*May 20, 2010 by Anonymous*

**Maths**

Please help, I need to calculate the gradient of a straight line that passes through the points (4,3) and (10,0)
*July 8, 2010 by Just*

**chemistry**

calculate volume of co2 produced by combustion of 40 ml of acetone in presence of excess oxygen?
*August 8, 2010 by siddhant*

**calculus**

Calculate the volume of the body which is obtained by rotating the curve y = ex 2px, 0 x 1 about the x-axis.
*August 13, 2010 by Student*

**Math**

How would I calculate the area of a sector of a circle with radius 2 m that subtends an angle pi/3
*August 14, 2010 by Dave*

**chemistry**

Calculate the expansion work done when 50 g of water is electrolysed under constant pressure at 25C
*September 5, 2010 by Dana*

**Physical chemistry**

Calculate the pressure exerted by 1.0 mol C2H6 behaving as a perfect gas
*September 13, 2010 by Melissa*

**biochemistry**

How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium lactate?
*September 18, 2010 by nicki*

**Science**

A horse with a force of 50 N pulls a cart of wood a distance of 10 m. Calculate the amount of work done.
*October 6, 2010 by George perez*

**chemistry**

I need to calculate the density, with work shown. 50.0 mg of a gas which occupies a volume of 0.0064 L ?
*October 7, 2010 by alisha*

**physics**

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight anlge? f ?
*October 8, 2010 by Bolo*

**Physics**

Calculate the tangential speed of the earth around the sun (assuming a circular orbit).
*October 13, 2010 by Tamara*

**statistics**

Sample size is 24, Mean rate of 6.50%, Standard Deviation is 1.20. Calculate 90% of confidence interval
*October 14, 2010 by sue*

**CHEMISTRY**

calculate the number of moles of solute present in 124.0g of a solution that is 6.45% glucose by mass.
*October 14, 2010 by lulu*

**physics**

calculate the impulse necessary to stop a 1500 kg car travelling at 90km/hour
*October 18, 2010 by Anonymous*

**Calculus**

Use Newton's Method with the function f(x)=x^2-2 and initial value Xo=2 to calculate x1,x2,x3. I have no idea how to do this
*October 27, 2010 by Don*

**chem**

calculate the molality of a solution that has 1.02kg sucrose (C12H22O11), dissolved in 554g water.
*October 27, 2010 by julia*

**PHYSICS**

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
*October 29, 2010 by Mattie*

**Physics**

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
*October 31, 2010 by Lisa*

**UW River Falls**

Calculate the enthalpy change, , for the process in which 40.0 of water is converted from liquid at 12.8 to vapor at 25.0.
*November 5, 2010 by Anonymous*

**chemistry **

Calculate the frequency of electromagnetic radiation emitted by the hydrogen atom in the electron transition from n = 7 to n = 6.
*November 7, 2010 by Emily *

**Chem 110 **

Calculate amount of milliliters of 2.0 M HCl needed to neutralize 0.15 mol of NaOH
*November 8, 2010 by Matilda *

**sociology**

Describe other measurements besides IAT sociologist utilize to calculate prejudice?
*November 14, 2010 by Shantai*

**chemistry**

calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=5 to n=1 how do I do this?
*November 21, 2010 by Lisa*

**Chemistry**

The solubility of calcium sulfate at 30 degrees C is .209 g/100mL solution. calculate its Ksp.
*November 29, 2010 by Al*

**Chemistry**

Calculate the concentration of the solution in mass percent: 122 g KCl in 628 g H2O.
*November 30, 2010 by Kelsey G*

**Chemistry**

calculate the percent composition, by mass, of carbon in Na2CO3. please explain how you get the answer.
*January 2, 2011 by denise*

**Chemistry (acids and bases)**

Calculate pH, pOH, [H+], [OH-], and Ka for a 0.026 M solution of HI (a strong acid). Please help me :(
*January 7, 2011 by Marie*

**physics**

How can I calculate exactly where a marble will drop if it is rolling of a table with very little friction??
*January 8, 2011 by lia*

**Statistic**

Calculations please, Calculate the first, second, and third quartiles of the following samples. 5 8 2 9 5 3 7 4 2 7 4 10 4 3 5 23
*January 31, 2011 by Delisha*

**chemistry**

Calculate the mass in grams for a gold sample that absorbs 225 to change its temperature from 16.0 to 36.0.
*February 3, 2011 by Heather*

**Chemistry**

Calculate the amount of Citric acid monohydrate needed to make 100 mL of 0.1 M solution
*February 7, 2011 by Emily*

**Math**

Given that f(x) = a log x for some constant a, and that f(7) 5:282, determine the value of a and calculate f(13) to 3 decimals.
*February 10, 2011 by Diane*

**Geometry**

Describe the information you need in order to calculate a segment length in a right triangle
*February 11, 2011 by Jonathon*

**chemistry**

Calculate the empirical formula of each compound from the mass-composition data given below. A)41%N and 59%O B)45%Na,23%P and 32%O
*February 13, 2011 by twynna*

**chemistry**

Calculate the number of moles and atoms. A)64 gm of O2 B)58.9 gm of CI C)90.5gm of (HN4)2SO4 D)243gm of Mg2
*February 13, 2011 by twynna*

**geometry**

An object is made from a cylinder with a hemisphere at each end.r=5cm, height=12 .Calculate volume.
*February 16, 2011 by reshma*

**Chemistry**

Calculate the pH of (1)0.150M KC2H3O2: (2)0.200M pyridine chloride, C5H5NHCl: and(3) 0.500M NaCl
*February 21, 2011 by Joshua*

**Chemistry**

Calculate the pH of (1)0.150M KC2H3O2: (2)0.200M pyridine chloride, C5H5NHCl: and(3) 0.500M NaCl
*February 21, 2011 by Joshua*

**Physics**

Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.
*February 27, 2011 by James*

**Chemistry**

Calculate the mass of sodium bicarbonate needed to neutralize 3.0 mL of 3.0 M HCl. Show your work.
*March 2, 2011 by Dan*

**Chemistry**

Calculate the mass of sodium bicarbonate needed to neutralize 3.0 mL of 3.0 M HCl. Show your work.
*March 2, 2011 by Dan*

**chemistry**

calculate the mass of water produced when 3 g HCL reacts with excess sodium carbonate
*March 3, 2011 by joe*

**Physics**

Calculate the distance (in km)that Larry runs if he maintains an average speed of 8km/hr for 45 minutes.
*March 5, 2011 by Roger*

**chemistry 32**

Calculate the concentration, in molarity, of a solutiion prepared by adding 9 mL of water to 1mL of 0.1 M of HCl
*March 10, 2011 by Adrian*

**chemistry**

Calculate the mass of kl in grams required to prepare 5.00x10power 2mL of 2.80M solution
*March 11, 2011 by lisa*

**geometry**

Calculate the volume of the figure shown. a = 8 and b = 12. Use 3.14 for pi and round answer to the nearest tenth
*March 28, 2011 by BreAnna*

**chemistry**

Calculate the molar solubility of in the following substances. Pure water and 1.5×10−3 K2CrO4
*March 14, 2011 by Bob*

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