140 Answered Questions for the topic College Chemistry
College Chemistry Drawing The Structures for IUPAC Names
Draw the Condensed or Expanded structure formula for the following 4- bromo – 2-pentanone Propyl ethanoate 2-chloro propanamine
Finding the difference in solubility
Consider the solubility of Ca(OH)2 in each of the following solutions. For each solution, indicate whether the Ca(OH)2 solubility will increase, decrease, or not change as compared to the... more
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
Finding Bond Polarity?
Rank the following bonds from least polar to most polar:Ge−FF−FK−FSe−FAs−Fleast polar ______< _____ < _____< ______< ______ most polar
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?
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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