CHEMISTRY COMMUNITY

chemstudent_1K

In general, does bond angle strain only apply to cyclic structures?

chemstudent_1K

Question 2.46 asks to list all the functional groups present in aspartame. The solution lists carboxylic acid, amine, ester, and amide. Why isn't ether also in the list since at the top of the structure, there is an oxygen bonded to two carbons?

chemstudent_1K

Instead of writing (prop-1-en-2-yl) in 2-methyl-5-(prop-1-en-2-yl)cyclohex-2-enone, is it wrong to name the structure using (1-methyleth-1-ene) instead (similar to the method described on page 23 in the organic chemistry textbook)? So instead of 2-methyl-5-(prop-1-en-2-yl)cyclohex-2-enone, is it wro...

chemstudent_1K

For part b of self test 2.2A is it also correct to call the structure
1,4-diiodocyclohexa-1,3,5-triene?

chemstudent_1K

Part B of self test 2.1B asks to give the molecular formula for polytetrafluoroethylene. The solution shows a structure of polytetrafluoroethylene where the two carbons are attached by a single bond. If the polytetrafluoroethylene ends in ene why aren't the carbons attached by a double bond (despite...

chemstudent_1K

On page 152 in the organic textbook there is an electrophilic addition reaction between propene and hydrogen bromide. In the first step, how do you know to add the hydrogen to the carbon on the very right side? Would it be wrong to place the hydrogen on the center carbon and give the carbon on the v...

chemstudent_1K

In the organic chemistry text book it says that alkyl halides (e.g. CH3Cl) and carbonyls (e.g. (CH3)2CO) are common electrophiles. How are they electrophiles if all atoms in the molecules have an octet of valence electrons and are not positively charged?

chemstudent_1K

"The rate constant of the reaction between CO2 an OH- in aqueous solution to give the HCO3- ion is 1.5E10/Ms at 25C. Determine the rate constant at blood temperature (37C) given that the activation energy for the reaction is 38kJ/mol." If A an Ea are independent of temperature why can't yo...

chemstudent_1K

Conceptually, for elementary reactions, why are the powers on concentrations for the rate laws simply the number of particles found in the reaction?

chemstudent_1K

Are differential rate laws used only for initial reaction rates?

chemstudent_1K

How would Volta have ordered the following metals, if he put the most strongly reducing metal first: Fe, Ag, Au, Zn, Cu, Ni, Co, Al? Is this question asking to order the metals based on how strong they are as reduction agents or is it asking to order them based on the strength with which they are re...

chemstudent_1K

So is the opposite true for the anode? The ion with the lowest charge is written before ions with higher charges?

chemstudent_1K

For example if there are three ions, H+, MnO4-, and Mn2+ present at the cathode, does it matter what order you write them in a cell diagram? In other words, does it matter whether the ions are placed like ||H+, MnO4-, Mn2+|Pt ,
|| MnO4-, Mn2+, H+|Pt or any other order of the three?

chemstudent_1K

Using data in appendix 2B calculate the standard potential for the half-reaction U4+ + 4e- -> U. Why can't you just stop after adding the standard potentials for the two half reaction U4+ + e- -> U3+ and U3+ + 3e- ->U? Why isn't this sum the answer and why do you have to go onto adding the delta G v...

chemstudent_1K

Part of HW question 14.13d asks to write the half reactions for Au+->Au + Au+3

One of the half reactions is Au+ + e- -> Au, but how do we know to use Au+3 + 3e- -> Au for the other half reaction instead of Au+3 + 2e- -> Au+?

chemstudent_1K

The standard Gibbs free energy of formation of Tl3+(aq) is +215kJ/mol at 25C. Calculate the standard potential of the Tl3+/Tl couple. The solution manual uses the deltaG=-nFE formula and solves for E to get the answer, but isn't this answer the standard potential of the entire cell, not the standard...

chemstudent_1K

Calculate the equilibrium constant at 25C and at 150C for each of the following reactions, using data available in appendix 2A: A. NH4Cl(s)<->NH3(g)+HCl(g) Does it matter whether we use deltaG=sum of deltaG(products)-deltaG(reactants) or deltaG=deltaH-TdeltaS to find the standard free energy? And do...

chemstudent_1K

When calculating standard reaction enthalpy, entropy, and Gibbs free energy from formation values, why do the answers have units with /mol? Shouldn't /mol cancel out since you multiply by the coefficient in the calculation?

chemstudent_1K

To use the two formulas, deltaS=nRln(V2/V1) and deltaS=nCln(T2/T1), does it matter whether a reaction occurs reversibly or not?

chemstudent_1K

Is the molar kinetic energy of an ideal gas the same as the internal energy of an ideal gas?

chemstudent_1K

Oxygen difluoride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2,HF, and heat:

OF2(g)+H20(g)->O2(g)+2HF(g) delta H=-318kJ

What is the change in internal energy for the action of 1.00 mol OF2?

Are we just supposed to assume that the reaction occurs at 298K?

chemstudent_1K

Conceptually, what occurs in a molecule that leads it to have residual entropy?

chemstudent_1K

Why does heat need to be under constant pressure in order to be a state function? Conceptually, why is heat not a state function?

chemstudent_1K

Hw 8.43 pg 310: The following data were collected for a new compound used in cosmetics: delta Hfus=10.0kJmol-1, delta Hvap=20.0kJmol-1; heat capacities: 30Jmol-1 for the solid; 60Jmol-1 for the liquid; 30Jmol-1 for the gas. Which heating curve below best matches the data for the compound? Why does t...

chemstudent_1K

When the question states "The cooling system that surrounds the cylinder absorbs 947 kJ as heat," it means that the surroundings has gained that 947 kJ as heat and warms up because the system has given off the 947 kJ of heat, making q (heat given off by system) in the equation, delta U=q+w...

chemstudent_1K

Temperature remains constant during the solid to liquid transition because the heat must first be used to separate the (ice) water molecules apart to form liquid water before heat can be used to raise the temperature of the liquid. The same is true for the liquid to vapor transition.

CHEMISTRY COMMUNITY

Search found 26 matches

bond angle strain

Question 2.46

2-methyl-5-(prop-1-en-2-yl)cyclohex-2-enone

Self test 2.2A

Self test 2.1B

Organic Textbook

common electrophiles

HW 15.63

Elementary Reactions

Rate laws

HW 14.85

Re: Cell Diagrams

Cell Diagrams

HW 14.27

HW 14.13d

HW 14.33a

HW 11.83

Units

Change in entropy

Molar Kinetic Energy

HW 8.49

Residual entropy

State function

HW 8.43

Re: Problem 8.13

Re: phase change