J.R. S.

Molecule AB2 forms with A as the central atom and a total of 18 valence electrons to share. (below are the answers I tried) a.Draw the Lewis structure for Ab2 I drew A with a double bond to B and... more

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Chemistry

09/05/17

Quantum numbers

How many electrons in a tellurium atom have quantum number l=1? Explain

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Bio

09/05/17

Illustrate phospho-diester bond

Biology class 11 biomolecules

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Chemistry Organic Chemistry Chemical Reactions

09/05/17

multiple choice HCL + carbonate/nitrate question

31 A mixture of solids is treated with an excess of dilute hydrochloric acid. A colourless gas is evolved and a white precipitate forms. What are the solids in the mixture? A calcium carbonate... more

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Chemistry Conversion

09/05/17

Solve the equation

How many mL of 0.18 M H2SO4 solution are needed to react completely with 11.15 g of Fe2O3 in the following reaction? Fe2O3(s) + 3H2SO4(aq) → Fe2 (SO4)3(aq) + 3 H2O(l)

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Chemistry

09/04/17

If 56.8 mL of BaCl2 solution is needed to precipitate all the sulfate ion in a 772-mg sample of Na2SO4, what is the molarity of the solution?

Just need a little bit of help. thanks!

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Charge

09/04/17

what is the charge in coulumbs of the nucleus of a chlorine atom

i mainly want to know how to find the number of electrons. Q = NUMBER OF ELECTRONS/ 6.25 x 10^18

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Math Question

09/04/17

An alloy is made of 62% copper, 24% lead, and 14 % tin. If 72.2 # of copper is used in a batch how many pounds of the alloy can be made?

I don't know how to find the pounds in this question.

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Rate Distance, Rate, Time

09/04/17

how do I solve18 3/4 divided by 5 ? I am not sure how it equals 3 3/4.

Amanda can jog 18 3/4 miles in 5 hours. At this rate, how many miles can Amanda jog in 4 hours?

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Chemistry

09/03/17

he molality of silver nitrate, AgNO3, in an aqueous solution is 2.78 mol/kg. What is the mole fraction of silver nitrate in the solution?

please answer I'm so lost

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Algebra 1 Word Problem

09/03/17

How many pounds of cornmeal should be in the mixture?

Soybean meal is 18% protein; cornmeal is 9% protein. How many poundspounds of each should be mixed together in order to get 360-lb mixture that is 13% protein?

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Chemistry

09/03/17

Why is it necessary to perform a series of extractions on the urine sample prior to analysis?

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Chemistry

09/03/17

solution of quinine

f you are provided with a 200 ppm solution of quinine, how much would you need to transfer to a 50 mL volumetric flask to prepare a 500 ppb solution? What would its concentration be in mol L-1?

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Other

09/03/17

Soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360LB mixture that is 10% protein?

How much cornmeal should be in the mixture ?

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Neuron/nerve Impulse Resting Potential Threshold Of Neuron

09/02/17

If the threshold of a neuron were the same as the neuron's resting potential what happens to that resting potential?

How can the threshold and the resting potential be the same? What happens to resting potential? Would it continue to fire action signals and cycle?

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Organic Chemistry Ap Chemistry Help With Homework I Am Stumped Beyond Belief

09/02/17

butane in a limited amount of oxygen

A 30cm3 sample of butane, C4H10, was completely reacted in a limited supply of oxygen to produce 60 cm3 of carbon dioxide and 60 cm3 of carbon monoxide.All volumes were measured at room temperature... more

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Chemistry

09/02/17

What is the osmotic pressure of a solution made by dissolving 30.0 g of glucose, C6H12O6, in enough water to form 650.0 mL of solution at 14.0 ∘C ? Express your

18.Osmotic Pressure of a Glucose Solution

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Chemistry

09/02/17

A solution containing ethylene glycol and water has a vapor pressure of 7.88 torr at 10∘C. Pure water has a vapor pressure of 9.21 torr at 10∘C. What is the mol

12. Calculating the Vapor Pressure of a Solution Containing a Nonvolatile Nonelectrolyte Solute

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Chemistry

09/02/17

Calculate the vapor pressure at 25∘C of a solution containing 55.3 g ethylene glycol (HOCH2CH2OH) and 285.2 g water. The vapor pressure of pure water at 25∘C is

12. Calculating the Vapor Pressure of a Solution Containing a Nonvolatile Nonelectrolyte Solute

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Chemistry Raoult's Law

09/02/17

A solution is composed of 1.40 mol cyclohexane (P∘cy=97.6 torr) and 2.70 mol acetone (P∘ac=229.5 torr). What is the total vapor pressure Ptotal above this solut

Raoult's Law: Nonvolatile and Volatile Solutes

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Chemistry Raoult's Law

09/02/17

If 0.640 mol of a nonvolatile nonelectrolyte are dissolved in 3.90 mol of water, what is the vapor pressure PH2O of the resulting solution? The vapor pressure

Raoult's Law: Nonvolatile and Volatile Solutes

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Chemistry

09/02/17

A specific chocolate candy contains 7.00 g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 2.00 lb of candy?

Express your answer numerically in kilograms for it to be right

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Convert 1010 kilometers to inches using dimensional analysis method. Please use sig fig show results in both decimal and scientific notation

Assuming that you collected the DNA of 100 buccal cells, how many ng DNA did you collect?

If 40.0 mL of 1.00 M glucose is mixed with 20.0 mL of 0.200 M NaCl, what is [glucose] in the resulting solution?