214 Answered Questions for the topic College Chemistry

College Chemistry Chemistry Chem Chem 102

04/06/20

Satisfying Octet Rule?
Draw Lewis structures for the following compounds/ions.Decide if the compound/ion listed can satisfy the octet rule (duet rule for H), if so choose Satisfies Octet Rule from the drop down menu.If... more
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College Chemistry Chemistry Chem Chem 102

04/05/20

Finding Bond Polarity?

Rank the following bonds from least polar to most polar:Ge−FF−FK−FSe−FAs−Fleast polar  ______<  _____ < _____<  ______<  ______  most polar
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College Chemistry Chemistry Chem Chem 102

04/03/20

Finding the Identity of an Unknown Ion
An unknown ion with a charge of +1 has the following electron configuration:[Ar] 4s0 3d5 4p5What is the identity of the unknown ion?
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College Chemistry Chemistry Chem Chem 102

03/31/20

Finding the Excited State?
A hydrogen atom in an excited state returns to the ground state. The photon emitted in this process has a wavelength of 122 nm. What was the excited state of the hydrogen atom prior to returning to... more
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College Chemistry Chemistry Chemistry Lab Chem 103

03/29/20

Calorimetry: How to Find Heat Lost?
In Part 1 of the lab you will test how well a coffee cup calorimeter matches the ideal case. You will do this by adding a known mass of warmer than room temperature water (at a known temperature)... more
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College Chemistry Chemistry Chem Chem 102

03/08/20

Finding partial pressure at equilibrium?
One method for producing hydrogen is to react coke (mostly solid carbon) with steam to make syngas, a mixture of CO and hydrogenC(s) + H2O(g) ⇌ CO(g) + H2(g)     Kp = 0.45 at 900 K     ΔH = +131... more
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College Chemistry Chemistry Chem 102

03/08/20

Finding moles of a specific product at equilibrium constant?
For the reaction:2H2O(g) ⇌ 2H2(g) + O2(g)KC = 2.40 x 10-3 at a given temperature.At equilibrium, it is found that [H2O] = 0.205 M and [H2] = 1.20 x 10-2 M.If the reaction is run in a 7.00 L... more
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College Chemistry Chemistry Chem Lab

02/28/20

Finding the Average Epsilon and Molarity of Unknown Solution
Stock Solution: 8.8×10-5 MSolution #1: 1.809×10-5 MSolution #2: 1.046×10-5 MYou measure the absorbance of each solution (at λmax = 524 nm) and obtain the following results: ... more
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College Chemistry Chemistry Chem Chem 102

02/28/20

Heat of Formation for One Mole
Find the heat of formation for a mole of carbon monoxide (CO) given: CO2(g) + C(s) → 2CO(g) ∆ Ho = 172.5 kJ C(s) + O2(g) → CO2(g) ∆ Ho = -393.5 kJ Use kJ and 3 significant figures for... more
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College Chemistry Chemistry Chem 102

02/21/20

Finding Work and Value of ΔE?
Calculate the work (w) and ΔEo, in kJ, at 298 K and 1 atm pressure, for the combustion of one mole of C3H8 (g). First write and balance the equation. The products will be CO2 (g) and H2O (g).The... more
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College Chemistry Chemistry Chem 102

02/20/20

Partial and Total Pressure Problem
Mixtures of helium and oxygen are used in scuba diving tanks to help prevent "the bends". For a particular dive, 35.7 L of oxygen gas at 25.0oC and 1.08 atm, and 6.33 L of helium gas at 25.0oC and... more
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College Chemistry Chemistry Chem

01/29/20

Finding Reactants and Using a Balanced Equation
Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation:N2(g) + 3H2(g) → 2NH3(g)1. What is the maximum mass of ammonia that can be produced from... more
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College Chemistry Chemistry Chem

01/29/20

Theoretical yield of CO2 produced by combustion
Assuming gasoline is 90.0% isooctane, with a density of 0.692 g/mL, what is the theoretical yield (in grams) of CO2 produced by the combustion of 1.10 x 1010 gallons of gasoline (the estimated... more
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College Chemistry Chemistry Chem

01/23/20

Finding "Mystery Elements" by using the isotope format
I am really confused on numbers 3 and 4 of the chart because of their use of charges. I think number three is Titanium and four is Chlorine, but cannot figure out the electrons or neutrons. Enter... more
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College Chemistry Chemistry Chem Chem 101

11/30/19

Figuring out Intermolecular Forces?
I believe the answer for the first question is hydrogen bonding, but I am not sure about the other ones.What is the strongest type of intermolecular force in each of the following... more
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College Chemistry Chemistry Chem Chem 101

11/30/19

Chemistry Resonance Question?
I am a bit confused, and the only one I am pretty sure has resonance is CNS-.Which of the following compounds/ions exhibit resonance? Select "yes" or "no" for each... more
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College Chemistry Chemistry Chem 101

11/21/19

Shapes of Molecules?
This an online assignment I have gotten wrong twice. Help is appreciated, thanks!What is the shape of each molecule below? Select the correct answer. Answers can be used more than... more
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College Chemistry Chemistry Chem Chem 101

11/21/19

Trigonal Bipyramids? Confused.
Which of the following compounds exhibit trigonal bipyramidal electron geometry? Select true if the molecule exhibits trigonal bipyramidal electron geometry. Otherwise, select false. IF5 SF6 KrCl2... more
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College Chemistry Chemistry Chem 101

11/19/19

Following Octet Rule? How do you know when it is impossible??
Draw Lewis structures for the following compounds/ions. In which of the compounds/ions listed is the octet rule (or the duet rule for hydrogen) impossible to satisfy for all atoms in the formula?... more
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11/12/19

Electron Pair Arrangements?
Select the following molecular structures which can arise from a tetrahedral electron pair arrangement.Select all that are true. trigonal planar T-shaped trigonal pyramid octahedral square planar
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College Chemistry Chemistry Chemistry College

10/22/19

Stoichometry Chemistry Question About Concentration Ions
You react 100.0 mL of 0.100 M lead(II) nitrate with 200.0 mL of 0.250 M potassium iodide. What is the concentration of I− ions left in solution after the reaction is... more
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College Chemistry Chemistry Stoichiometry College

10/15/19

Help! Chemistry Stoichiometry Question
I figured out how to balance this equation, and I think I figured out the answer to question number 1 for mass (I got 33.2 g of sodium carbonate), but how do you find the ions that are not... more
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College Chemistry Chemistry College General Chemistry

10/03/19

Finding Grams of Complete Reaction
I found the balanced equation : 4C + S8 = 4CS2, but I am confused about how to find the grams.Any help is greatly appreciated!Consider the following unbalanced reaction: C(s) + S8(s) → CS2(l) How... more
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College Chemistry Chemistry College Chem 101

09/17/19

Help! Strange Question about empirical formulas and naming
An oxide of iron is found to be 77.75% iron by mass. Determine the empirical formula for this compound and name it.Enter the formula with correct capitalization and subscripts (so "H2O" for H2O).... more
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College Chemistry Chemistry College Chem 101

09/17/19

Finding Pressure (in atm) when volume is reduced
A gas at 379 K occupies 6.16 L at a pressure of 0.510 atm. What will its pressure (in atm) be at 250. K if its volume is reduced to 4.50 L? 
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