05/04/22

Red-Ox Reactions and their Stoichiometry

If 2.34 g of copper are added to a solution of silver nitrate a concentration such that this last reactant is in excess; 7.95 g of metallic silver are formed. which would be the stoichiometry ratio... more
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05/04/22

Light in the infrared portion of the electromagnetic spectrum excites vibrations of certain molecules, causing them to move more rapidly.
Light in the infrared portion of the electromagnetic spectrum excites vibrations of certain molecules, causing them to move more rapidly. In this manner, infrared light can be used to heat a... more
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05/03/22

Acid pKa of heart medicine

A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak... more
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05/03/22

Chemistry colligative prop
To determine the molar mas of a protein (i= 1) called a “zinc finger," a chemist dissolves 4.52x10^-4 g of theProtein in 10.40 mL of water at 19.20C. When the solution Is placed in a U-tube, the... more
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05/03/22

Chemistry freezing point

The normal freezing point of acetic acid is -45.3 °C. What is the new freezing point of acetic acid when 12.543 g of potassium sulfate (MM = 174.26 g/mol) is dissolved in 500.0 mL of acetic acid?... more
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05/03/22

Vapor pressure and mole fraction
An equimolar liquid mixture of water and ethanol is in equilibrium with its vapor. (i) Find the total vapor pressure(ii) Find the mole fraction of water in vapor. P(water)=24mmHgP(ethanol)=45mmHg
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05/03/22

Clapeyron equation

Using the Clapeyron equation write an expression for Ta, its boiling point at a pressure Pa. The expression should be given where T is in terms of Pa, Tb, its heat of vaporization, and physical... more
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05/03/22

Is this calculation for solution preparation correct?

Is this calculation for solution preparation correct? A. 25‎0.0 mL 1.0 M st‎ock HCl solut‎ion c1v1=c2v2(12.1M) (x)=(250.0mL)(1.0M)x= 20.6611‎5mL, 12.1M HCl ≅ 20.7mL, 12.1M HClB. 25‎0.0 mL... more
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05/03/22

Chemistry Question:

The standard reduction potential for Cu²⁺, the voltage measured between a standard hydrogen electrode and a Cu electrode immersed in a solution where [Cu²⁺] = 1.00 M, is 0.340 V. The positive... more
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05/03/22

Calculate [Pb2+] in a voltaic cell

A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate [Pb2+] when [Mn2+] is 2.7 M and Ecell = 0.49 V.
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05/03/22

What elements that can be isolated by electrolysis of their aqueous salts?
Identify those elements that can be isolated by electrolysis of their aqueous salts. (Select all that apply.)1.Lithium2.tin3.strontium4.chlorine
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05/02/22

What is the molar enthalpy of solution of Ammonium Chloride (NH4Cl) and what reputable source did you get the info from?
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05/02/22

Help w Chem gas law problem
if the pressure of a ballon is 870 torr at room temp 20 c whats the temp of the room if the pressure is changed to 10 atmgaylussac
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05/02/22

Do you think that potassium could be detected visually in the presence of sodium by heating this mixture in a flame?
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05/02/22

May I get help on this
Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq) Calculate the amount of Ga(s) that can be deposited from a Ga(III) solution using a... more
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05/02/22

A current of 4.91 A is passed through a Ni(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 9.40 g of nickel? time required: h
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05/02/22

Can I get help on this please
Calculate the cell potential for the galvanic cell in which the reactionCd(s)+Co2+(aq)↽−−⇀ Cd2+(aq)+Co(s)occurs at 25 °C, given that [Cd2 + ] =  0.00140M and [Co2 + ] = 0.801
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05/02/22

How much heat is needed to raise the temperature by 2.00oC for a metal with a specific heat of 0.780 J/goC and a mass of 45 grams?
I would appreciate the help on this question
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05/02/22

How much heat is needed to raise the temperature by 2.00oC for a metal with a specific heat of 0.780 J/goC and a mass of 45 grams?
I would appreciate the help on this question
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05/02/22

When excess water is added to a mixture of citric acid and sodium bicarbonate present in a bath bomb, the following reaction takes place C₆H₈O₇(s) + 3 NaHCO₃(s) + H₂O(l) → Na₃C₆H₅O₇(aq)...
When excess water is added to a mixture of citric acid and sodium bicarbonate present in a bath bomb, the following reaction takes place C₆H₈O₇(s) + 3 NaHCO₃(s) + H₂O(l) → Na₃C₆H₅O₇(aq) + 4 H₂O(l)... more
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05/02/22

Basic Chemistry Problem
Identify if the following conditions/materials have increased or decreased intermolecular forces. Vegetable oils can flow easily compared with honey Liquid helium has the lowest boiling point at... more
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04/30/22

If the base solution is 0.50 M NaOH, and the volume of the initial acid solution as 25.00 mL, what is the concentration of the acid solution?
CH3COOH(aq)+H2O(l)=CH3COO^-+H3O^+Equivalence point approximated is :8.3 pH and 12.mL for volume of base This question comes with a graph:yaxis is the pH: 0, 2, 4, 6, 8, 10, 12,14,16xaxis is volume... more
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04/30/22

How much does the concentration of carbon-containing molecules increase if 1 mole of C8H18 in 1.0m2 of air is converted into CO2?
From the discussion question from Module 5, recall the chemical equation for the combustion of gasoline (iso-octane, C8H18) is:2C8H18 + 25O2 ---> 16CO2 + 18H2OThis means that 2 moles of... more
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04/30/22

Determine the volume.
Determine the volume in L of 86.65 g of NO2 gas at 38 oC and 750 mm Hg.
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04/30/22

Nuclide half-life?
A 50 mg sample of a radioactive nuclide is administered to a patient to obtain an image of her thyroid.If the nuclide has a half-life of 12 hours, how much of the nuclide remains in the patient... more
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