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Chemistry Biochemistry Buffer Solution

03/05/21

Phosphate Buffer Preparation :Describe how would you prepare a phosphate buffer solution (100.0 mL, 0.100 M, pH 7.00)?

H2PO4− (aq) + H2O (l) ⇌ HPO42− (aq) + H3O+ (aq) pKa2 = 7.20Question: Describe how would you prepare a phosphate buffer solution (100.0 mL, 0.100 M, pH 7.00)? Available Stock Solution: Concentrated... more

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Chemistry Biochemistry Organic Chemistry

03/04/21

Calculate K from Equilibrium

The equilibrium constant, Kc, for the following reaction is 10.5 at 350K.2CH2Cl2(g) CH4(g) + CCl4(g)If an equilibrium mixture of the three gases in a 19.4 L container at 350K contains 0.372 mol... more

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Chemistry Biochemistry Organic Chemistry

03/04/21

Calculate K from Equilibrium

The equilibrium constant, Kc , for the following reaction is 7.00×10-5 at 673 K.NH4I(s) NH3(g) + HI(g)If an equilibrium mixture of the three compounds in a 6.70 L container at 673 K... more

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03/04/21

increases or decreasing volume of a gas what happens to pressure? is this a direct or indirect relationship?

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Chemistry General Chemistry College Chemistry

03/04/21

A 435−g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assuming no loss of water and a heat capacity for the vessel of 10.0 J...

J/0C, what is the final temperature of the system (c of copper = 0.387 J/g·°C)?

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03/04/21

What is the word equation for NaOH + MgSO4 --> Na2SO4 + Mg(OH)2

assume the numbers are subscripts.

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Chemistry Stoichiometry Solutions Stoichiometry

03/04/21

I think I'm over thinking this

I feel like i'm over thinking this but every time i do it i get it wrong.Here's the problemIn a titration, 402.8 mL of a 7.16 M solution of hydrochloric acid is neutralized by with 0.359 L of... more

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Chemistry Ap Chemistry

03/04/21

chemistry question about PE & forward reaction cont.

Given the following information about a forward reaction:Heat of reactants is 100kJHeat of products is 20kJHeat of activated complex is 150 kJActivation energy for the uncatalyzed reaction is... more

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Chemistry Ap Chemistry

03/04/21

chemistry question about PE & forward reaction

Given the following information about a forward reaction:Heat of reactants is 100kJHeat of products is 20kJHeat of activated complex is 150 kJActivation energy for the uncatalyzed reaction is... more

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03/04/21

Which pair of molecules can form a hydrogen bond?

Which pair of molecules can form a hydrogen bond?Question 1 options:CH4 and H2OPF4 and NH3NO2 and KF

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03/04/21

If you dissolve 47g of NaOH in 600g of water, what is the solution concentration?

If you dissolve 47g of NaOH in 600g of water, what is the solution concentration?

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03/04/21

chem hw question

The rate constant for this first-order reaction is 0.0292 s−1 at 300 °C.A⟶productsIf the initial mass of A is 18.06 g, calculate the mass of A remaining after 1.20 min.

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03/04/21

When aqueous solutions of ammonium carbonate and barium nitrate are combined, solid barium carbonate and a solution of ammonium nitrate are formed. The net ionic equation for this reaction is:

I have been trying this but I always have something wrong. Thanks for helping.When aqueous solutions of ammonium carbonate and barium nitrate are combined, solid barium carbonate and a solution... more

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03/04/21

chemistry question

The rate constant for the reaction is 0.750 M−1⋅s−1 at 200 ∘C.A⟶productsIf the initial concentration of A is 0.00320 M, what will be the concentration after 665 s?Please help...

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03/03/21

Does a reaction occur when aqueous solutions of chromium(II) sulfate and potassium hydroxide are combined?

Does a reaction occur when aqueous solutions of chromium(II) sulfate and potassium hydroxide are combined? I have been trying this exercise but a cant get it well, I apreciatte your help.

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03/03/21

Balance redox reaction include H+; ClO2 (aq) + Cr2O7 (aq )⇄ClO4 (aq) + Cr^(3+) (aq). (half reaction method)

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Chemistry Stoichiometry Solutions Stoichiometry

03/03/21

Still very confused

A volume of 15.6 mL of a 0.45 M solution of hydrogen phosphate (or phosphoric acid) reacts completely with 54.7 milliliters of sodium hydroxide. What is the molarity of the sodium hydroxide solution?

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Chemistry Stoichiometry

03/03/21

more stoichiometry

If 200.8 g of carbon dioxide gas is made from the complete combustion of isopropanol (C3H7OH), how many moles of oxygen are used up?

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Chemistry Stoichiometry

03/03/21

I do not understand stoichiometry

In the balanced chemical equation below, how many moles of copper(II) carbonate are made from the reaction of 42 grams of copper(II) sulfate and excess silver carbonate? CuSO4 + Ag2CO3 -->... more

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03/03/21

chemistry question thank you

500.0 g of butane is burned in the presence of oxygen.2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(g) ΔH = -1248 KJ

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03/03/21

Chemistry II Boiling Point of Aqueous Solution

MgCl₂ has a van't Hoff factor of 2.70. What would be the boiling point (in °C) of an aqueous solution containing 1.90 mol of MgCl₂ in 1.00 kg of water? (Kb for water is 0.512 °C/m. The boiling... more

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03/03/21

Chemistry II Molar Mass of Polymer

A 276 mL aqueous solution containing 0.400 g of an unknown polymer has an osmotic pressure of 26.9 torr at 30.0 °C. What is the molar mass of the polymer?

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03/03/21

Chemistry II Boiling Point Problem

The boiling point of pure ethanol (C₂H₅OH, MM = 46.07 g/mol) is 78.4 °C. A solution is made using 100.0 g of ethanol (the solvent) and 25.1 g of glucose (MM = 180.16 g/mol). What is the boiling... more

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03/03/21

Chemistry Solutions Stoichiometry

A volume of 11.7 mL of a 0.22 M solution of hydrogen phosphate (or phosphoric acid) reacts completely with 59.7 milliliters of sodium hydroxide. What is the molarity of the sodium hydroxide solution?

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03/03/21

Which of the following pictures best represents what you might see? Water molecules have been omitted for clarity. Explain your answer

Six molecules of sugar, represented as, are dissolved in water. The picture below represents the solution at the molecular level. Which of the following pictures best represents what you might... more

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