04/12/19

Chemistry Question
The energy of a photon emitted when an electron underwent a transition to n = 3 energy level was 1.060x10-19 J. What was the initial energy level for the electron?
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04/12/19

oxalate analysis (oxidation and reduction)
A 20.00 ml sample of 0.520 M oxalic acid is titrated with 26.50 of an unknown KMnO4 solution. a) How many moles of oxalic acid were present in this titration?b.)How many moles of KMnO4 were needed... more
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04/11/19

Ksp value calculation
Calculate the Ksp value for lithium carbonate if its solubility is 7.4×10−2 mol/L
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04/11/19

Precipitate problem
Will Ca(OH)2 precipitate from a 1L solution containing 1.2 ×10−5 mol Ca(NO3)2 and 2.0 ×10−6 mol NaOH.KspCa(OH)2= 5.02 ×10−6Justify your answer.
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04/11/19

molar solubility
What is the molar solubility of Ca(OH)2 if Ksp=5.02×10−6 in 0.25 M CaCl2 solution.Clearly state any assumptions that were made and justify the assumption was a good assumption.(HINT: If the... more
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04/11/19

solubility equation
What is the solubility of  Ca(OH)2 if Ksp= 5.2 x 10^-6. Use the solubility to determine the [OH-] (Show your work)
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04/11/19

Ion Product Expression
Write the ion product expression for Ca(OH)2
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04/11/19

a 196 gram sample of sodium carbonate is dissolved in nitric acid. Assuming excess acid, determine the mass and volume at STP of dry CO2 gass produced by the reaction
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04/11/19

How to solve this?
You have been provided with 250 ml of a stock solution of 5 M Sodium acetate. Explain how you would prepare 100 ml of 0.5 M Sodium acetate working solution from the given stock.
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04/11/19

Hess's law question?
The combustion of ethane can be expressed through the equation below: C2H6(g) + 7/2O2(g) ---> 2CO2(g) + 3H2O(g) Using Hess’ law, prove that the formation reactions of ethane, carbon dioxide and... more
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04/11/19

How much energy (in J) is lost when a sample of iron with a mass of 26.8 g cools from 71.0 ∘C to 22.0 ∘C?
How much energy (in J) is lost when a sample of iron with a mass of 26.8 g cools from 71.0 ∘C to 22.0 ∘C?
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04/11/19

Complete the table by writing the relative masses (g) and %’s of the elements found in 1 mole of acesulfame potassium.

Element Mass (in g) of element in 1 mole of acesulfame potassium % of element in 1 mole of acesulfame potassium C H O N S K
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04/11/19

Given 10 grams of c2h4 , what masses of carbon dioxide and water are produced

Given 10 grams of c2h4 , what masses of carbon dioxide and water are produced
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04/11/19

What is the final pressure of 250. mL of a gas at 270. mm Hg and 24.0°C if the gas is heated to 80.0°C? Assume the volume and the amount of gas are held constant.

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04/11/19

How does the room temperature effect the molar mass when conducted in an experiment?
In Chemistry class we conducted an experiment for ideal gas laws with dry ice. My teacher is wondering what would happen to the final molar mass if the room temperature was recorded wrong.
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04/11/19

What is the difference between neuroanatomy and neurobiology?

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04/10/19

what is the new pressure when a 250mL sample of gas at 2.75 atmosphere of pressure and 26 celsius is heated to 50 celsius and a volume of 125mL
what is the new pressure when a 250mL sample of gas at 2.75 atmosphere of pressure and 26 celsius is heated to 50 celsius and a volume of 125mL
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04/10/19

chemistry solution calculations
if you transferred 20.00 mL of 0.100 M stock sucrose solution to s 500.0 mL volumetric flask and filled to the mark of the flask , what would be the new diluted concentration of the sucrose solution?
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04/10/19

Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C.
Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C, given that [Sn2+]=0.0576 M , [Co3+]=0.0322 M , [Sn4+]=0.00271 M , and [Co2+]=0.01024 M . Standard... more
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04/10/19

Homework chemistry help
1. The density of mercury is 13.6 g/mL. What is the mass, in grams, of 0.689 cm3 of mercury? [1mL = 1cm3]
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04/10/19

Chemistry how to solve help
calculate the amount of aluminum nitrate produced from 50.00 grams of copper II nitrate?calculate the amount of aluminum nitrate produced from 50.00 grams of copper II... more
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04/10/19

calculate the amount of aluminum nitrate produced from 50.00 grams of copper II nitrate?
calculate the amount of aluminum nitrate produced from 50.00 grams of copper II nitrate? 3 Cu(NO3)2 + 2 AlCl3 → 3 CuCl2 + 2 Al(NO3)3 calculate the amount of HNO3 required to complete react with... more
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04/10/19

Is cell wall and cytoplasm an organelle?
So cell wall is an organelle? Whereas, it is not a membrane-closed organelle? Cytoplasm is an organelle? Whereas, it is not a membrane-closed organelle?
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04/10/19

A compound is composed of 19.01g C,18.48g N, 25.34g O and 1.58g H. Find the empirical and molecular formulas of this compound
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04/09/19

nitrogen gas and hydrogen gas react to form ammonia according to the following thermochemical equation. 3h2 + n2 - 2nh3 delta h = -96kj write the balanced chemical equation
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